Sync docs from master to gh-pages
This commit is contained in:
Marcin Grzejszczak
18
antrun/build-main.xml
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18
antrun/build-main.xml
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@@ -0,0 +1,18 @@
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||||
<?xml version="1.0" encoding="UTF-8" ?>
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||||
<project name="maven-antrun-" default="main" >
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<target name="main">
|
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<echo file="/Users/mgrzejszczak/repo/spring-cloud-bus/docs/target/spring-cloud-bus.adoc">:nofooter:
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||||
:linkcss:
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||||
:stylesdir: css
|
||||
:stylesheet: manual-singlepage.css
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||||
|
||||
= {docs-main}
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||||
|
||||
{spring-cloud-version}
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||||
|
||||
== Pick The Documentation Option
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||||
|
||||
- link:single/{docs-main}.html[Single HTML]
|
||||
- link:multi/multi_{docs-main}.html[Multi HTML]</echo>
|
||||
</target>
|
||||
</project>
|
||||
35
css/highlight.css
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35
css/highlight.css
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@@ -0,0 +1,35 @@
|
||||
/*
|
||||
code highlight CSS resemblign the Eclipse IDE default color schema
|
||||
@author Costin Leau
|
||||
*/
|
||||
|
||||
.hl-keyword {
|
||||
color: #7F0055;
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
.hl-comment {
|
||||
color: #3F5F5F;
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
.hl-multiline-comment {
|
||||
color: #3F5FBF;
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
.hl-tag {
|
||||
color: #3F7F7F;
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||||
}
|
||||
|
||||
.hl-attribute {
|
||||
color: #7F007F;
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||||
}
|
||||
|
||||
.hl-value {
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||||
color: #2A00FF;
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||||
}
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||||
|
||||
.hl-string {
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||||
color: #2A00FF;
|
||||
}
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||||
9
css/manual-multipage.css
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9
css/manual-multipage.css
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@@ -0,0 +1,9 @@
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||||
@IMPORT url("manual.css");
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||||
|
||||
body.firstpage {
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||||
background: url("../images/background.png") no-repeat center top;
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||||
}
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||||
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||||
div.part h1 {
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||||
border-top: none;
|
||||
}
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||||
6
css/manual-singlepage.css
Normal file
6
css/manual-singlepage.css
Normal file
@@ -0,0 +1,6 @@
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||||
@IMPORT url("manual.css");
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||||
|
||||
body {
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||||
background: url("../images/background.png") no-repeat center top;
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}
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||||
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344
css/manual.css
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344
css/manual.css
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@@ -0,0 +1,344 @@
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@IMPORT url("highlight.css");
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|
||||
html {
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||||
padding: 0pt;
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||||
margin: 0pt;
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||||
}
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||||
|
||||
body {
|
||||
color: #333333;
|
||||
margin: 15px 30px;
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||||
font-family: Helvetica, Arial, Freesans, Clean, Sans-serif;
|
||||
line-height: 1.6;
|
||||
-webkit-font-smoothing: antialiased;
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||||
}
|
||||
|
||||
code {
|
||||
font-size: 16px;
|
||||
font-family: Consolas, "Liberation Mono", Courier, monospace;
|
||||
}
|
||||
|
||||
:not(a)>code {
|
||||
color: #6D180B;
|
||||
}
|
||||
|
||||
:not(pre)>code {
|
||||
background-color: #F2F2F2;
|
||||
border: 1px solid #CCCCCC;
|
||||
border-radius: 4px;
|
||||
padding: 1px 3px 0;
|
||||
text-shadow: none;
|
||||
white-space: nowrap;
|
||||
}
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||||
|
||||
body>*:first-child {
|
||||
margin-top: 0 !important;
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||||
}
|
||||
|
||||
div {
|
||||
margin: 0pt;
|
||||
}
|
||||
|
||||
hr {
|
||||
border: 1px solid #CCCCCC;
|
||||
background: #CCCCCC;
|
||||
}
|
||||
|
||||
h1,h2,h3,h4,h5,h6 {
|
||||
color: #000000;
|
||||
cursor: text;
|
||||
font-weight: bold;
|
||||
margin: 30px 0 10px;
|
||||
padding: 0;
|
||||
}
|
||||
|
||||
h1,h2,h3 {
|
||||
margin: 40px 0 10px;
|
||||
}
|
||||
|
||||
h1 {
|
||||
margin: 70px 0 30px;
|
||||
padding-top: 20px;
|
||||
}
|
||||
|
||||
div.part h1 {
|
||||
border-top: 1px dotted #CCCCCC;
|
||||
}
|
||||
|
||||
h1,h1 code {
|
||||
font-size: 32px;
|
||||
}
|
||||
|
||||
h2,h2 code {
|
||||
font-size: 24px;
|
||||
}
|
||||
|
||||
h3,h3 code {
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||||
font-size: 20px;
|
||||
}
|
||||
|
||||
h4,h1 code,h5,h5 code,h6,h6 code {
|
||||
font-size: 18px;
|
||||
}
|
||||
|
||||
div.book,div.chapter,div.appendix,div.part,div.preface {
|
||||
min-width: 300px;
|
||||
max-width: 1200px;
|
||||
margin: 0 auto;
|
||||
}
|
||||
|
||||
p.releaseinfo {
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||||
font-weight: bold;
|
||||
margin-bottom: 40px;
|
||||
margin-top: 40px;
|
||||
}
|
||||
|
||||
div.authorgroup {
|
||||
line-height: 1;
|
||||
}
|
||||
|
||||
p.copyright {
|
||||
line-height: 1;
|
||||
margin-bottom: -5px;
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||||
}
|
||||
|
||||
.legalnotice p {
|
||||
font-style: italic;
|
||||
font-size: 14px;
|
||||
line-height: 1;
|
||||
}
|
||||
|
||||
div.titlepage+p,div.titlepage+p {
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||||
margin-top: 0;
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||||
}
|
||||
|
||||
pre {
|
||||
line-height: 1.0;
|
||||
color: black;
|
||||
}
|
||||
|
||||
a {
|
||||
color: #4183C4;
|
||||
text-decoration: none;
|
||||
}
|
||||
|
||||
p {
|
||||
margin: 15px 0;
|
||||
text-align: left;
|
||||
}
|
||||
|
||||
ul,ol {
|
||||
padding-left: 30px;
|
||||
}
|
||||
|
||||
li p {
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
div.table {
|
||||
margin: 1em;
|
||||
padding: 0.5em;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
div.table table,div.informaltable table {
|
||||
display: table;
|
||||
width: 100%;
|
||||
}
|
||||
|
||||
div.table td {
|
||||
padding-left: 7px;
|
||||
padding-right: 7px;
|
||||
}
|
||||
|
||||
.sidebar {
|
||||
line-height: 1.4;
|
||||
padding: 0 20px;
|
||||
background-color: #F8F8F8;
|
||||
border: 1px solid #CCCCCC;
|
||||
border-radius: 3px 3px 3px 3px;
|
||||
}
|
||||
|
||||
.sidebar p.title {
|
||||
color: #6D180B;
|
||||
}
|
||||
|
||||
pre.programlisting,pre.screen {
|
||||
font-size: 15px;
|
||||
padding: 6px 10px;
|
||||
background-color: #F8F8F8;
|
||||
border: 1px solid #CCCCCC;
|
||||
border-radius: 3px 3px 3px 3px;
|
||||
clear: both;
|
||||
overflow: auto;
|
||||
line-height: 1.4;
|
||||
font-family: Consolas, "Liberation Mono", Courier, monospace;
|
||||
}
|
||||
|
||||
table {
|
||||
border-collapse: collapse;
|
||||
border-spacing: 0;
|
||||
border: 1px solid #DDDDDD !important;
|
||||
border-radius: 4px !important;
|
||||
border-collapse: separate !important;
|
||||
line-height: 1.6;
|
||||
}
|
||||
|
||||
table thead {
|
||||
background: #F5F5F5;
|
||||
}
|
||||
|
||||
table tr {
|
||||
border: none;
|
||||
border-bottom: none;
|
||||
}
|
||||
|
||||
table th {
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
table th,table td {
|
||||
border: none !important;
|
||||
padding: 6px 13px;
|
||||
}
|
||||
|
||||
table tr:nth-child(2n) {
|
||||
background-color: #F8F8F8;
|
||||
}
|
||||
|
||||
td p {
|
||||
margin: 0 0 15px 0;
|
||||
}
|
||||
|
||||
div.table-contents td p {
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
div.important *,div.note *,div.tip *,div.warning *,div.navheader *,div.navfooter *,div.calloutlist *
|
||||
{
|
||||
border: none !important;
|
||||
background: none !important;
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
div.important p,div.note p,div.tip p,div.warning p {
|
||||
color: #6F6F6F;
|
||||
line-height: 1.6;
|
||||
}
|
||||
|
||||
div.important code,div.note code,div.tip code,div.warning code {
|
||||
background-color: #F2F2F2 !important;
|
||||
border: 1px solid #CCCCCC !important;
|
||||
border-radius: 4px !important;
|
||||
padding: 1px 3px 0 !important;
|
||||
text-shadow: none !important;
|
||||
white-space: nowrap !important;
|
||||
}
|
||||
|
||||
.note th,.tip th,.warning th {
|
||||
display: none;
|
||||
}
|
||||
|
||||
.note tr:first-child td,.tip tr:first-child td,.warning tr:first-child td
|
||||
{
|
||||
border-right: 1px solid #CCCCCC !important;
|
||||
padding-top: 10px;
|
||||
}
|
||||
|
||||
div.calloutlist p,div.calloutlist td {
|
||||
padding: 0;
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
div.calloutlist>table>tbody>tr>td:first-child {
|
||||
padding-left: 10px;
|
||||
width: 30px !important;
|
||||
}
|
||||
|
||||
div.important,div.note,div.tip,div.warning {
|
||||
margin-left: 0px !important;
|
||||
margin-right: 20px !important;
|
||||
margin-top: 20px;
|
||||
margin-bottom: 20px;
|
||||
padding-top: 10px;
|
||||
padding-bottom: 10px;
|
||||
}
|
||||
|
||||
div.toc {
|
||||
line-height: 1.2;
|
||||
}
|
||||
|
||||
dl,dt {
|
||||
margin-top: 1px;
|
||||
margin-bottom: 0;
|
||||
}
|
||||
|
||||
div.toc>dl>dt {
|
||||
font-size: 32px;
|
||||
font-weight: bold;
|
||||
margin: 30px 0 10px 0;
|
||||
display: block;
|
||||
}
|
||||
|
||||
div.toc>dl>dd>dl>dt {
|
||||
font-size: 24px;
|
||||
font-weight: bold;
|
||||
margin: 20px 0 10px 0;
|
||||
display: block;
|
||||
}
|
||||
|
||||
div.toc>dl>dd>dl>dd>dl>dt {
|
||||
font-weight: bold;
|
||||
font-size: 20px;
|
||||
margin: 10px 0 0 0;
|
||||
}
|
||||
|
||||
tbody.footnotes * {
|
||||
border: none !important;
|
||||
}
|
||||
|
||||
div.footnote p {
|
||||
margin: 0;
|
||||
line-height: 1;
|
||||
}
|
||||
|
||||
div.footnote p sup {
|
||||
margin-right: 6px;
|
||||
vertical-align: middle;
|
||||
}
|
||||
|
||||
div.navheader {
|
||||
border-bottom: 1px solid #CCCCCC;
|
||||
}
|
||||
|
||||
div.navfooter {
|
||||
border-top: 1px solid #CCCCCC;
|
||||
}
|
||||
|
||||
.title {
|
||||
margin-left: -1em;
|
||||
padding-left: 1em;
|
||||
}
|
||||
|
||||
.title>a {
|
||||
position: absolute;
|
||||
visibility: hidden;
|
||||
display: block;
|
||||
font-size: 0.85em;
|
||||
margin-top: 0.05em;
|
||||
margin-left: -1em;
|
||||
vertical-align: text-top;
|
||||
color: black;
|
||||
}
|
||||
|
||||
.title>a:before {
|
||||
content: "\00A7";
|
||||
}
|
||||
|
||||
.title:hover>a,.title>a:hover,.title:hover>a:hover {
|
||||
visibility: visible;
|
||||
}
|
||||
|
||||
.title:focus>a,.title>a:focus,.title:focus>a:focus {
|
||||
outline: 0;
|
||||
}
|
||||
BIN
images/background.png
Normal file
BIN
images/background.png
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Binary file not shown.
|
After Width: | Height: | Size: 18 KiB |
BIN
images/caution.png
Normal file
BIN
images/caution.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 2.0 KiB |
BIN
images/important.png
Normal file
BIN
images/important.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 2.0 KiB |
BIN
images/logo.png
Normal file
BIN
images/logo.png
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Binary file not shown.
|
After Width: | Height: | Size: 4.3 KiB |
BIN
images/note.png
Normal file
BIN
images/note.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 2.2 KiB |
BIN
images/sts_exception.png
Normal file
BIN
images/sts_exception.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 65 KiB |
BIN
images/tip.png
Normal file
BIN
images/tip.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 931 B |
BIN
images/warning.png
Normal file
BIN
images/warning.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 2.1 KiB |
BIN
images/web-selected.png
Normal file
BIN
images/web-selected.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 178 KiB |
35
multi/css/highlight.css
Normal file
35
multi/css/highlight.css
Normal file
@@ -0,0 +1,35 @@
|
||||
/*
|
||||
code highlight CSS resemblign the Eclipse IDE default color schema
|
||||
@author Costin Leau
|
||||
*/
|
||||
|
||||
.hl-keyword {
|
||||
color: #7F0055;
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
.hl-comment {
|
||||
color: #3F5F5F;
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
.hl-multiline-comment {
|
||||
color: #3F5FBF;
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
.hl-tag {
|
||||
color: #3F7F7F;
|
||||
}
|
||||
|
||||
.hl-attribute {
|
||||
color: #7F007F;
|
||||
}
|
||||
|
||||
.hl-value {
|
||||
color: #2A00FF;
|
||||
}
|
||||
|
||||
.hl-string {
|
||||
color: #2A00FF;
|
||||
}
|
||||
9
multi/css/manual-multipage.css
Normal file
9
multi/css/manual-multipage.css
Normal file
@@ -0,0 +1,9 @@
|
||||
@IMPORT url("manual.css");
|
||||
|
||||
body.firstpage {
|
||||
background: url("../images/background.png") no-repeat center top;
|
||||
}
|
||||
|
||||
div.part h1 {
|
||||
border-top: none;
|
||||
}
|
||||
6
multi/css/manual-singlepage.css
Normal file
6
multi/css/manual-singlepage.css
Normal file
@@ -0,0 +1,6 @@
|
||||
@IMPORT url("manual.css");
|
||||
|
||||
body {
|
||||
background: url("../images/background.png") no-repeat center top;
|
||||
}
|
||||
|
||||
344
multi/css/manual.css
Normal file
344
multi/css/manual.css
Normal file
@@ -0,0 +1,344 @@
|
||||
@IMPORT url("highlight.css");
|
||||
|
||||
html {
|
||||
padding: 0pt;
|
||||
margin: 0pt;
|
||||
}
|
||||
|
||||
body {
|
||||
color: #333333;
|
||||
margin: 15px 30px;
|
||||
font-family: Helvetica, Arial, Freesans, Clean, Sans-serif;
|
||||
line-height: 1.6;
|
||||
-webkit-font-smoothing: antialiased;
|
||||
}
|
||||
|
||||
code {
|
||||
font-size: 16px;
|
||||
font-family: Consolas, "Liberation Mono", Courier, monospace;
|
||||
}
|
||||
|
||||
:not(a)>code {
|
||||
color: #6D180B;
|
||||
}
|
||||
|
||||
:not(pre)>code {
|
||||
background-color: #F2F2F2;
|
||||
border: 1px solid #CCCCCC;
|
||||
border-radius: 4px;
|
||||
padding: 1px 3px 0;
|
||||
text-shadow: none;
|
||||
white-space: nowrap;
|
||||
}
|
||||
|
||||
body>*:first-child {
|
||||
margin-top: 0 !important;
|
||||
}
|
||||
|
||||
div {
|
||||
margin: 0pt;
|
||||
}
|
||||
|
||||
hr {
|
||||
border: 1px solid #CCCCCC;
|
||||
background: #CCCCCC;
|
||||
}
|
||||
|
||||
h1,h2,h3,h4,h5,h6 {
|
||||
color: #000000;
|
||||
cursor: text;
|
||||
font-weight: bold;
|
||||
margin: 30px 0 10px;
|
||||
padding: 0;
|
||||
}
|
||||
|
||||
h1,h2,h3 {
|
||||
margin: 40px 0 10px;
|
||||
}
|
||||
|
||||
h1 {
|
||||
margin: 70px 0 30px;
|
||||
padding-top: 20px;
|
||||
}
|
||||
|
||||
div.part h1 {
|
||||
border-top: 1px dotted #CCCCCC;
|
||||
}
|
||||
|
||||
h1,h1 code {
|
||||
font-size: 32px;
|
||||
}
|
||||
|
||||
h2,h2 code {
|
||||
font-size: 24px;
|
||||
}
|
||||
|
||||
h3,h3 code {
|
||||
font-size: 20px;
|
||||
}
|
||||
|
||||
h4,h1 code,h5,h5 code,h6,h6 code {
|
||||
font-size: 18px;
|
||||
}
|
||||
|
||||
div.book,div.chapter,div.appendix,div.part,div.preface {
|
||||
min-width: 300px;
|
||||
max-width: 1200px;
|
||||
margin: 0 auto;
|
||||
}
|
||||
|
||||
p.releaseinfo {
|
||||
font-weight: bold;
|
||||
margin-bottom: 40px;
|
||||
margin-top: 40px;
|
||||
}
|
||||
|
||||
div.authorgroup {
|
||||
line-height: 1;
|
||||
}
|
||||
|
||||
p.copyright {
|
||||
line-height: 1;
|
||||
margin-bottom: -5px;
|
||||
}
|
||||
|
||||
.legalnotice p {
|
||||
font-style: italic;
|
||||
font-size: 14px;
|
||||
line-height: 1;
|
||||
}
|
||||
|
||||
div.titlepage+p,div.titlepage+p {
|
||||
margin-top: 0;
|
||||
}
|
||||
|
||||
pre {
|
||||
line-height: 1.0;
|
||||
color: black;
|
||||
}
|
||||
|
||||
a {
|
||||
color: #4183C4;
|
||||
text-decoration: none;
|
||||
}
|
||||
|
||||
p {
|
||||
margin: 15px 0;
|
||||
text-align: left;
|
||||
}
|
||||
|
||||
ul,ol {
|
||||
padding-left: 30px;
|
||||
}
|
||||
|
||||
li p {
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
div.table {
|
||||
margin: 1em;
|
||||
padding: 0.5em;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
div.table table,div.informaltable table {
|
||||
display: table;
|
||||
width: 100%;
|
||||
}
|
||||
|
||||
div.table td {
|
||||
padding-left: 7px;
|
||||
padding-right: 7px;
|
||||
}
|
||||
|
||||
.sidebar {
|
||||
line-height: 1.4;
|
||||
padding: 0 20px;
|
||||
background-color: #F8F8F8;
|
||||
border: 1px solid #CCCCCC;
|
||||
border-radius: 3px 3px 3px 3px;
|
||||
}
|
||||
|
||||
.sidebar p.title {
|
||||
color: #6D180B;
|
||||
}
|
||||
|
||||
pre.programlisting,pre.screen {
|
||||
font-size: 15px;
|
||||
padding: 6px 10px;
|
||||
background-color: #F8F8F8;
|
||||
border: 1px solid #CCCCCC;
|
||||
border-radius: 3px 3px 3px 3px;
|
||||
clear: both;
|
||||
overflow: auto;
|
||||
line-height: 1.4;
|
||||
font-family: Consolas, "Liberation Mono", Courier, monospace;
|
||||
}
|
||||
|
||||
table {
|
||||
border-collapse: collapse;
|
||||
border-spacing: 0;
|
||||
border: 1px solid #DDDDDD !important;
|
||||
border-radius: 4px !important;
|
||||
border-collapse: separate !important;
|
||||
line-height: 1.6;
|
||||
}
|
||||
|
||||
table thead {
|
||||
background: #F5F5F5;
|
||||
}
|
||||
|
||||
table tr {
|
||||
border: none;
|
||||
border-bottom: none;
|
||||
}
|
||||
|
||||
table th {
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
table th,table td {
|
||||
border: none !important;
|
||||
padding: 6px 13px;
|
||||
}
|
||||
|
||||
table tr:nth-child(2n) {
|
||||
background-color: #F8F8F8;
|
||||
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|
||||
|
||||
td p {
|
||||
margin: 0 0 15px 0;
|
||||
}
|
||||
|
||||
div.table-contents td p {
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
div.important *,div.note *,div.tip *,div.warning *,div.navheader *,div.navfooter *,div.calloutlist *
|
||||
{
|
||||
border: none !important;
|
||||
background: none !important;
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
div.important p,div.note p,div.tip p,div.warning p {
|
||||
color: #6F6F6F;
|
||||
line-height: 1.6;
|
||||
}
|
||||
|
||||
div.important code,div.note code,div.tip code,div.warning code {
|
||||
background-color: #F2F2F2 !important;
|
||||
border: 1px solid #CCCCCC !important;
|
||||
border-radius: 4px !important;
|
||||
padding: 1px 3px 0 !important;
|
||||
text-shadow: none !important;
|
||||
white-space: nowrap !important;
|
||||
}
|
||||
|
||||
.note th,.tip th,.warning th {
|
||||
display: none;
|
||||
}
|
||||
|
||||
.note tr:first-child td,.tip tr:first-child td,.warning tr:first-child td
|
||||
{
|
||||
border-right: 1px solid #CCCCCC !important;
|
||||
padding-top: 10px;
|
||||
}
|
||||
|
||||
div.calloutlist p,div.calloutlist td {
|
||||
padding: 0;
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
div.calloutlist>table>tbody>tr>td:first-child {
|
||||
padding-left: 10px;
|
||||
width: 30px !important;
|
||||
}
|
||||
|
||||
div.important,div.note,div.tip,div.warning {
|
||||
margin-left: 0px !important;
|
||||
margin-right: 20px !important;
|
||||
margin-top: 20px;
|
||||
margin-bottom: 20px;
|
||||
padding-top: 10px;
|
||||
padding-bottom: 10px;
|
||||
}
|
||||
|
||||
div.toc {
|
||||
line-height: 1.2;
|
||||
}
|
||||
|
||||
dl,dt {
|
||||
margin-top: 1px;
|
||||
margin-bottom: 0;
|
||||
}
|
||||
|
||||
div.toc>dl>dt {
|
||||
font-size: 32px;
|
||||
font-weight: bold;
|
||||
margin: 30px 0 10px 0;
|
||||
display: block;
|
||||
}
|
||||
|
||||
div.toc>dl>dd>dl>dt {
|
||||
font-size: 24px;
|
||||
font-weight: bold;
|
||||
margin: 20px 0 10px 0;
|
||||
display: block;
|
||||
}
|
||||
|
||||
div.toc>dl>dd>dl>dd>dl>dt {
|
||||
font-weight: bold;
|
||||
font-size: 20px;
|
||||
margin: 10px 0 0 0;
|
||||
}
|
||||
|
||||
tbody.footnotes * {
|
||||
border: none !important;
|
||||
}
|
||||
|
||||
div.footnote p {
|
||||
margin: 0;
|
||||
line-height: 1;
|
||||
}
|
||||
|
||||
div.footnote p sup {
|
||||
margin-right: 6px;
|
||||
vertical-align: middle;
|
||||
}
|
||||
|
||||
div.navheader {
|
||||
border-bottom: 1px solid #CCCCCC;
|
||||
}
|
||||
|
||||
div.navfooter {
|
||||
border-top: 1px solid #CCCCCC;
|
||||
}
|
||||
|
||||
.title {
|
||||
margin-left: -1em;
|
||||
padding-left: 1em;
|
||||
}
|
||||
|
||||
.title>a {
|
||||
position: absolute;
|
||||
visibility: hidden;
|
||||
display: block;
|
||||
font-size: 0.85em;
|
||||
margin-top: 0.05em;
|
||||
margin-left: -1em;
|
||||
vertical-align: text-top;
|
||||
color: black;
|
||||
}
|
||||
|
||||
.title>a:before {
|
||||
content: "\00A7";
|
||||
}
|
||||
|
||||
.title:hover>a,.title>a:hover,.title:hover>a:hover {
|
||||
visibility: visible;
|
||||
}
|
||||
|
||||
.title:focus>a,.title>a:focus,.title:focus>a:focus {
|
||||
outline: 0;
|
||||
}
|
||||
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3
multi/multi__addressing_all_instances_of_a_service.html
Normal file
3
multi/multi__addressing_all_instances_of_a_service.html
Normal file
@@ -0,0 +1,3 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>3. Addressing all instances of a service</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi__addressing_an_instance.html" title="2. Addressing an Instance"><link rel="next" href="multi__application_context_id_must_be_unique.html" title="4. Application Context ID must be unique"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3. Addressing all instances of a service</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__addressing_an_instance.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__application_context_id_must_be_unique.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_addressing_all_instances_of_a_service" href="#_addressing_all_instances_of_a_service"></a>3. Addressing all instances of a service</h1></div></div></div><p>The "destination" parameter is used in a Spring <code class="literal">PathMatcher</code> (with the path separator as a colon <code class="literal">:</code>) to determine if an instance will process the message. Using the example from above, "/bus/refresh?destination=customers:**" will target all instances of the "customers" service regardless of the profiles and ports set as the <code class="literal">ApplicationContext</code> ID.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__addressing_an_instance.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__application_context_id_must_be_unique.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">2. Addressing an Instance </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 4. Application Context ID must be unique</td></tr></table></div></body></html>
|
||||
3
multi/multi__addressing_an_instance.html
Normal file
3
multi/multi__addressing_an_instance.html
Normal file
@@ -0,0 +1,3 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>2. Addressing an Instance</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi__quick_start.html" title="1. Quick Start"><link rel="next" href="multi__addressing_all_instances_of_a_service.html" title="3. Addressing all instances of a service"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2. Addressing an Instance</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__quick_start.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__addressing_all_instances_of_a_service.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_addressing_an_instance" href="#_addressing_an_instance"></a>2. Addressing an Instance</h1></div></div></div><p>The HTTP endpoints accept a "destination" parameter, e.g. "/bus/refresh?destination=customers:9000", where the destination is an <code class="literal">ApplicationContext</code> ID. If the ID is owned by an instance on the Bus then it will process the message and all other instances will ignore it. Spring Boot sets the ID for you in the <code class="literal">ContextIdApplicationContextInitializer</code> to a combination of the <code class="literal">spring.application.name</code>, active profiles and <code class="literal">server.port</code> by default.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__quick_start.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__addressing_all_instances_of_a_service.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">1. Quick Start </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 3. Addressing all instances of a service</td></tr></table></div></body></html>
|
||||
3
multi/multi__application_context_id_must_be_unique.html
Normal file
3
multi/multi__application_context_id_must_be_unique.html
Normal file
@@ -0,0 +1,3 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>4. Application Context ID must be unique</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi__addressing_all_instances_of_a_service.html" title="3. Addressing all instances of a service"><link rel="next" href="multi__customizing_the_message_broker.html" title="5. Customizing the Message Broker"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4. Application Context ID must be unique</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__addressing_all_instances_of_a_service.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__customizing_the_message_broker.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_application_context_id_must_be_unique" href="#_application_context_id_must_be_unique"></a>4. Application Context ID must be unique</h1></div></div></div><p>The bus tries to eliminate processing an event twice, once from the original <code class="literal">ApplicationEvent</code> and once from the queue. To do this, it checks the sending application context id againts the current application context id. If multiple instances of a service have the same application context id, events will not be processed. Running on a local machine, each service will be on a different port and that will be part of the application context id. Cloud Foundry supplies an index to differentiate. To ensure that the application context id is the unique, set <code class="literal">spring.application.index</code> to something unique for each instance of a service. For example, in lattice, set <code class="literal">spring.application.index=${INSTANCE_INDEX}</code> in application.properties (or bootstrap.properties if using configserver).</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__addressing_all_instances_of_a_service.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__customizing_the_message_broker.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3. Addressing all instances of a service </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 5. Customizing the Message Broker</td></tr></table></div></body></html>
|
||||
36
multi/multi__broadcasting_your_own_events.html
Normal file
36
multi/multi__broadcasting_your_own_events.html
Normal file
@@ -0,0 +1,36 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>7. Broadcasting Your Own Events</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi__tracing_bus_events.html" title="6. Tracing Bus Events"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">7. Broadcasting Your Own Events</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__tracing_bus_events.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> </td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_broadcasting_your_own_events" href="#_broadcasting_your_own_events"></a>7. Broadcasting Your Own Events</h1></div></div></div><p>The Bus can carry any event of type <code class="literal">RemoteApplicationEvent</code>, but the
|
||||
default transport is JSON and the deserializer needs to know which
|
||||
types are going to be used ahead of time. To register a new type it
|
||||
needs to be in a subpackage of <code class="literal">org.springframework.cloud.bus.event</code>.</p><p>To customise the event name you can use <code class="literal">@JsonTypeName</code> on your custom class
|
||||
or rely on the default strategy which is to use the simple name of the class.
|
||||
Note that both the producer and the consumer will need access to the class
|
||||
definition.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_registering_events_in_custom_packages" href="#_registering_events_in_custom_packages"></a>7.1 Registering events in custom packages</h2></div></div></div><p>If you cannot or don’t want to use a subpackage of <code class="literal">org.springframework.cloud.bus.event</code>
|
||||
for your custom events, you must specify which packages to scan for events of
|
||||
type <code class="literal">RemoteApplicationEvent</code> using <code class="literal">@RemoteApplicationEventScan</code>. Packages
|
||||
specified with <code class="literal">@RemoteApplicationEventScan</code> include subpackages.</p><p>For example, if you have a custom event called <code class="literal">FooEvent</code>:</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">package</span> com.acme;
|
||||
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> FooEvent <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">extends</span> RemoteApplicationEvent {
|
||||
...
|
||||
}</pre><p>you can register this event with the deserializer in the following way:</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">package</span> com.acme;
|
||||
|
||||
<em><span class="hl-annotation" style="color: gray">@Configuration</span></em>
|
||||
<em><span class="hl-annotation" style="color: gray">@RemoteApplicationEventScan</span></em>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> BusConfiguration {
|
||||
...
|
||||
}</pre><p>Without specifying a value, the package of the class where <code class="literal">@RemoteApplicationEventScan</code>
|
||||
is used will be registered. In this example <code class="literal">com.acme</code> will be registered using the
|
||||
package of <code class="literal">BusConfiguration</code>.</p><p>You can also explicitly specify the packages to scan using the <code class="literal">value</code>, <code class="literal">basePackages</code> or
|
||||
<code class="literal">basePackageClasses</code> properties on <code class="literal">@RemoteApplicationEventScan</code>. For example:</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">package</span> com.acme;
|
||||
|
||||
<em><span class="hl-annotation" style="color: gray">@Configuration</span></em>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">//@RemoteApplicationEventScan({"com.acme", "foo.bar"})</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">//@RemoteApplicationEventScan(basePackages = {"com.acme", "foo.bar", "fizz.buzz"})</span>
|
||||
<em><span class="hl-annotation" style="color: gray">@RemoteApplicationEventScan(basePackageClasses = BusConfiguration.class)</span></em>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> BusConfiguration {
|
||||
...
|
||||
}</pre><p>All examples of <code class="literal">@RemoteApplicationEventScan</code> above are equivalent,
|
||||
in that the <code class="literal">com.acme</code> package will be registered by explicitly specifying the
|
||||
packages on <code class="literal">@RemoteApplicationEventScan</code>. Note, you can specify multiple base
|
||||
packages to scan.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__tracing_bus_events.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> </td></tr><tr><td width="40%" align="left" valign="top">6. Tracing Bus Events </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div></body></html>
|
||||
17
multi/multi__customizing_the_message_broker.html
Normal file
17
multi/multi__customizing_the_message_broker.html
Normal file
@@ -0,0 +1,17 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>5. Customizing the Message Broker</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi__application_context_id_must_be_unique.html" title="4. Application Context ID must be unique"><link rel="next" href="multi__tracing_bus_events.html" title="6. Tracing Bus Events"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5. Customizing the Message Broker</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__application_context_id_must_be_unique.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__tracing_bus_events.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_customizing_the_message_broker" href="#_customizing_the_message_broker"></a>5. Customizing the Message Broker</h1></div></div></div><p>Spring Cloud Bus uses
|
||||
<a class="link" href="https://cloud.spring.io/spring-cloud-stream" target="_top">Spring Cloud Stream</a> to
|
||||
broadcast the messages so to get messages to flow you only need to
|
||||
include the binder implementation of your choice in the
|
||||
classpath. There are convenient starters specifically for the bus with
|
||||
AMQP (RabbitMQ) and Kafka
|
||||
(<code class="literal">spring-cloud-starter-bus-[amqp,kafka]</code>). Generally speaking
|
||||
Spring Cloud Stream relies on Spring Boot autoconfiguration
|
||||
conventions for configuring middleware, so for instance the AMQP
|
||||
broker address can be changed with <code class="literal">spring.rabbitmq.*</code>
|
||||
configuration properties. Spring Cloud Bus has a handful of native
|
||||
configuration properties in <code class="literal">spring.cloud.bus.*</code>
|
||||
(e.g. <code class="literal">spring.cloud.bus.destination</code> is the name of the topic to use
|
||||
the the externall middleware). Normally the defaults will suffice.</p><p>To lean more about how to customize the message broker settings
|
||||
consult the Spring Cloud Stream documentation.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__application_context_id_must_be_unique.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__tracing_bus_events.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">4. Application Context ID must be unique </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 6. Tracing Bus Events</td></tr></table></div></body></html>
|
||||
10
multi/multi__quick_start.html
Normal file
10
multi/multi__quick_start.html
Normal file
@@ -0,0 +1,10 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>1. Quick Start</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi_pr01.html" title=""><link rel="next" href="multi__addressing_an_instance.html" title="2. Addressing an Instance"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1. Quick Start</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_pr01.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__addressing_an_instance.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_quick_start" href="#_quick_start"></a>1. Quick Start</h1></div></div></div><p>Spring Cloud Bus works by adding Spring Boot autconfiguration if it detects itself on the classpath. All you need to do to enable the bus is to add <code class="literal">spring-cloud-starter-bus-amqp</code> or <code class="literal">spring-cloud-starter-bus-kafka</code> to your dependency management and Spring Cloud takes care of the rest. Make sure the broker (RabbitMQ or Kafka) is available and configured: running on localhost you shouldn’t have to do anything, but if you are running remotely use Spring Cloud Connectors, or Spring Boot conventions to define the broker credentials, e.g. for Rabbit</p><p><b>application.yml. </b>
|
||||
</p><pre class="screen">spring:
|
||||
rabbitmq:
|
||||
host: mybroker.com
|
||||
port: 5672
|
||||
username: user
|
||||
password: secret</pre><p>
|
||||
</p><p>The bus currently supports sending messages to all nodes listening or all nodes for a particular service (as defined by Eureka). More selector criteria may be added in the future (ie. only service X nodes in data center Y, etc…​). There are also some http endpoints under the <code class="literal">/bus/*</code> actuator namespace. There are currently two implemented. The first, <code class="literal">/bus/env</code>, sends key/value pairs to update each node’s Spring Environment. The second, <code class="literal">/bus/refresh</code>, will reload each application’s configuration, just as if they had all been pinged on their <code class="literal">/refresh</code> endpoint.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>The Bus starters cover Rabbit and Kafka, because those are the two most common implementations, but Spring Cloud Stream is quite flexible and binder will work combined with <code class="literal">spring-cloud-bus</code>.</p></td></tr></table></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi_pr01.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__addressing_an_instance.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 2. Addressing an Instance</td></tr></table></div></body></html>
|
||||
43
multi/multi__tracing_bus_events.html
Normal file
43
multi/multi__tracing_bus_events.html
Normal file
@@ -0,0 +1,43 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>6. Tracing Bus Events</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi__customizing_the_message_broker.html" title="5. Customizing the Message Broker"><link rel="next" href="multi__broadcasting_your_own_events.html" title="7. Broadcasting Your Own Events"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">6. Tracing Bus Events</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__customizing_the_message_broker.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__broadcasting_your_own_events.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_tracing_bus_events" href="#_tracing_bus_events"></a>6. Tracing Bus Events</h1></div></div></div><p>Bus events (subclasses of <code class="literal">RemoteApplicationEvent</code>) can be traced by
|
||||
setting <code class="literal">spring.cloud.bus.trace.enabled=true</code>. If you do this then the
|
||||
Spring Boot <code class="literal">TraceRepository</code> (if it is present) will show each event
|
||||
sent and all the acks from each service instance. Example (from the
|
||||
<code class="literal">/trace</code> endpoint):</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"timestamp"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"2015-11-26T10:24:44.411+0000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"info"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"signal"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"spring.cloud.bus.ack"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"type"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"RefreshRemoteApplicationEvent"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"id"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"c4d374b7-58ea-4928-a312-31984def293b"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"origin"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"stores:8081"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"destination"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"*:**"</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">},</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"timestamp"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"2015-11-26T10:24:41.864+0000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"info"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"signal"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"spring.cloud.bus.sent"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"type"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"RefreshRemoteApplicationEvent"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"id"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"c4d374b7-58ea-4928-a312-31984def293b"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"origin"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"customers:9000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"destination"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"*:**"</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">},</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"timestamp"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"2015-11-26T10:24:41.862+0000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"info"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"signal"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"spring.cloud.bus.ack"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"type"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"RefreshRemoteApplicationEvent"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"id"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"c4d374b7-58ea-4928-a312-31984def293b"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"origin"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"customers:9000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"destination"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"*:**"</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span></pre><p>This trace shows that a <code class="literal">RefreshRemoteApplicationEvent</code> was sent from
|
||||
<code class="literal">customers:9000</code>, broadcast to all services, and it was received
|
||||
(acked) by <code class="literal">customers:9000</code> and <code class="literal">stores:8081</code>.</p><p>To handle the ack signals yourself you could add an <code class="literal">@EventListener</code>
|
||||
for the <code class="literal">AckRemoteApplicationEvent</code> and <code class="literal">SentApplicationEvent</code> types
|
||||
to your app (and enable tracing). Or you could tap into the
|
||||
<code class="literal">TraceRepository</code> and mine the data from there.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>Any Bus application can trace acks, but sometimes it will be
|
||||
useful to do this in a central service that can do more complex
|
||||
queries on the data. Or forward it to a specialized tracing service.</p></td></tr></table></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__customizing_the_message_broker.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__broadcasting_your_own_events.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">5. Customizing the Message Broker </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 7. Broadcasting Your Own Events</td></tr></table></div></body></html>
|
||||
3
multi/multi_pr01.html
Normal file
3
multi/multi_pr01.html
Normal file
@@ -0,0 +1,3 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title></title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="next" href="multi__quick_start.html" title="1. Quick Start"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-bus.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__quick_start.html">Next</a></td></tr></table><hr></div><div class="preface"><div class="titlepage"><div><div><h1 class="title"><a name="d0e9" href="#d0e9"></a></h1></div></div></div><p>Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions. A key idea is that the Bus is like a distributed Actuator for a Spring Boot application that is scaled out, but it can also be used as a communication channel between apps. Starters are provided for an AMQP broker as the transport or for Kafka, but the same basic feature set (and some more depending on the transport) is on the roadmap for other transports.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>Spring Cloud is released under the non-restrictive Apache 2.0 license. If you would like to contribute to this section of the documentation or if you find an error, please find the source code and issue trackers in the project at <a class="link" href="https://github.com/spring-cloud/spring-cloud-config/tree/master/docs/src/main/asciidoc" target="_top">github</a>.</p></td></tr></table></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi_spring-cloud-bus.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__quick_start.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Spring Cloud Bus </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 1. Quick Start</td></tr></table></div></body></html>
|
||||
3
multi/multi_spring-cloud-bus.html
Normal file
3
multi/multi_spring-cloud-bus.html
Normal file
@@ -0,0 +1,3 @@
|
||||
<html><head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>Spring Cloud Bus</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="next" href="multi_pr01.html" title=""></head><body class="firstpage" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Spring Cloud Bus</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi_pr01.html">Next</a></td></tr></table><hr></div><div lang="en" class="book"><div class="titlepage"><div><div><h1 class="title"><a name="d0e3"></a>Spring Cloud Bus</h1></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="preface"><a href="multi_pr01.html"></a></span></dt><dt><span class="chapter"><a href="multi__quick_start.html">1. Quick Start</a></span></dt><dt><span class="chapter"><a href="multi__addressing_an_instance.html">2. Addressing an Instance</a></span></dt><dt><span class="chapter"><a href="multi__addressing_all_instances_of_a_service.html">3. Addressing all instances of a service</a></span></dt><dt><span class="chapter"><a href="multi__application_context_id_must_be_unique.html">4. Application Context ID must be unique</a></span></dt><dt><span class="chapter"><a href="multi__customizing_the_message_broker.html">5. Customizing the Message Broker</a></span></dt><dt><span class="chapter"><a href="multi__tracing_bus_events.html">6. Tracing Bus Events</a></span></dt><dt><span class="chapter"><a href="multi__broadcasting_your_own_events.html">7. Broadcasting Your Own Events</a></span></dt><dd><dl><dt><span class="section"><a href="multi__broadcasting_your_own_events.html#_registering_events_in_custom_packages">7.1. Registering events in custom packages</a></span></dt></dl></dd></dl></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi_pr01.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"> </td><td width="40%" align="right" valign="top"> </td></tr></table></div></body></html>
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|
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<html><head>
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|
||||
<title>Spring Cloud Bus</title><link rel="stylesheet" type="text/css" href="css/manual-singlepage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div lang="en" class="book"><div class="titlepage"><div><div><h1 class="title"><a name="d0e3"></a>Spring Cloud Bus</h1></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="preface"><a href="#d0e9"></a></span></dt><dt><span class="chapter"><a href="#_quick_start">1. Quick Start</a></span></dt><dt><span class="chapter"><a href="#_addressing_an_instance">2. Addressing an Instance</a></span></dt><dt><span class="chapter"><a href="#_addressing_all_instances_of_a_service">3. Addressing all instances of a service</a></span></dt><dt><span class="chapter"><a href="#_application_context_id_must_be_unique">4. Application Context ID must be unique</a></span></dt><dt><span class="chapter"><a href="#_customizing_the_message_broker">5. Customizing the Message Broker</a></span></dt><dt><span class="chapter"><a href="#_tracing_bus_events">6. Tracing Bus Events</a></span></dt><dt><span class="chapter"><a href="#_broadcasting_your_own_events">7. Broadcasting Your Own Events</a></span></dt><dd><dl><dt><span class="section"><a href="#_registering_events_in_custom_packages">7.1. Registering events in custom packages</a></span></dt></dl></dd></dl></div><div class="preface"><div class="titlepage"><div><div><h1 class="title"><a name="d0e9" href="#d0e9"></a></h1></div></div></div><p>Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions. A key idea is that the Bus is like a distributed Actuator for a Spring Boot application that is scaled out, but it can also be used as a communication channel between apps. Starters are provided for an AMQP broker as the transport or for Kafka, but the same basic feature set (and some more depending on the transport) is on the roadmap for other transports.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>Spring Cloud is released under the non-restrictive Apache 2.0 license. If you would like to contribute to this section of the documentation or if you find an error, please find the source code and issue trackers in the project at <a class="link" href="https://github.com/spring-cloud/spring-cloud-config/tree/master/docs/src/main/asciidoc" target="_top">github</a>.</p></td></tr></table></div></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_quick_start" href="#_quick_start"></a>1. Quick Start</h1></div></div></div><p>Spring Cloud Bus works by adding Spring Boot autconfiguration if it detects itself on the classpath. All you need to do to enable the bus is to add <code class="literal">spring-cloud-starter-bus-amqp</code> or <code class="literal">spring-cloud-starter-bus-kafka</code> to your dependency management and Spring Cloud takes care of the rest. Make sure the broker (RabbitMQ or Kafka) is available and configured: running on localhost you shouldn’t have to do anything, but if you are running remotely use Spring Cloud Connectors, or Spring Boot conventions to define the broker credentials, e.g. for Rabbit</p><p><b>application.yml. </b>
|
||||
</p><pre class="screen">spring:
|
||||
rabbitmq:
|
||||
host: mybroker.com
|
||||
port: 5672
|
||||
username: user
|
||||
password: secret</pre><p>
|
||||
</p><p>The bus currently supports sending messages to all nodes listening or all nodes for a particular service (as defined by Eureka). More selector criteria may be added in the future (ie. only service X nodes in data center Y, etc…​). There are also some http endpoints under the <code class="literal">/bus/*</code> actuator namespace. There are currently two implemented. The first, <code class="literal">/bus/env</code>, sends key/value pairs to update each node’s Spring Environment. The second, <code class="literal">/bus/refresh</code>, will reload each application’s configuration, just as if they had all been pinged on their <code class="literal">/refresh</code> endpoint.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>The Bus starters cover Rabbit and Kafka, because those are the two most common implementations, but Spring Cloud Stream is quite flexible and binder will work combined with <code class="literal">spring-cloud-bus</code>.</p></td></tr></table></div></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_addressing_an_instance" href="#_addressing_an_instance"></a>2. Addressing an Instance</h1></div></div></div><p>The HTTP endpoints accept a "destination" parameter, e.g. "/bus/refresh?destination=customers:9000", where the destination is an <code class="literal">ApplicationContext</code> ID. If the ID is owned by an instance on the Bus then it will process the message and all other instances will ignore it. Spring Boot sets the ID for you in the <code class="literal">ContextIdApplicationContextInitializer</code> to a combination of the <code class="literal">spring.application.name</code>, active profiles and <code class="literal">server.port</code> by default.</p></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_addressing_all_instances_of_a_service" href="#_addressing_all_instances_of_a_service"></a>3. Addressing all instances of a service</h1></div></div></div><p>The "destination" parameter is used in a Spring <code class="literal">PathMatcher</code> (with the path separator as a colon <code class="literal">:</code>) to determine if an instance will process the message. Using the example from above, "/bus/refresh?destination=customers:**" will target all instances of the "customers" service regardless of the profiles and ports set as the <code class="literal">ApplicationContext</code> ID.</p></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_application_context_id_must_be_unique" href="#_application_context_id_must_be_unique"></a>4. Application Context ID must be unique</h1></div></div></div><p>The bus tries to eliminate processing an event twice, once from the original <code class="literal">ApplicationEvent</code> and once from the queue. To do this, it checks the sending application context id againts the current application context id. If multiple instances of a service have the same application context id, events will not be processed. Running on a local machine, each service will be on a different port and that will be part of the application context id. Cloud Foundry supplies an index to differentiate. To ensure that the application context id is the unique, set <code class="literal">spring.application.index</code> to something unique for each instance of a service. For example, in lattice, set <code class="literal">spring.application.index=${INSTANCE_INDEX}</code> in application.properties (or bootstrap.properties if using configserver).</p></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_customizing_the_message_broker" href="#_customizing_the_message_broker"></a>5. Customizing the Message Broker</h1></div></div></div><p>Spring Cloud Bus uses
|
||||
<a class="link" href="https://cloud.spring.io/spring-cloud-stream" target="_top">Spring Cloud Stream</a> to
|
||||
broadcast the messages so to get messages to flow you only need to
|
||||
include the binder implementation of your choice in the
|
||||
classpath. There are convenient starters specifically for the bus with
|
||||
AMQP (RabbitMQ) and Kafka
|
||||
(<code class="literal">spring-cloud-starter-bus-[amqp,kafka]</code>). Generally speaking
|
||||
Spring Cloud Stream relies on Spring Boot autoconfiguration
|
||||
conventions for configuring middleware, so for instance the AMQP
|
||||
broker address can be changed with <code class="literal">spring.rabbitmq.*</code>
|
||||
configuration properties. Spring Cloud Bus has a handful of native
|
||||
configuration properties in <code class="literal">spring.cloud.bus.*</code>
|
||||
(e.g. <code class="literal">spring.cloud.bus.destination</code> is the name of the topic to use
|
||||
the the externall middleware). Normally the defaults will suffice.</p><p>To lean more about how to customize the message broker settings
|
||||
consult the Spring Cloud Stream documentation.</p></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_tracing_bus_events" href="#_tracing_bus_events"></a>6. Tracing Bus Events</h1></div></div></div><p>Bus events (subclasses of <code class="literal">RemoteApplicationEvent</code>) can be traced by
|
||||
setting <code class="literal">spring.cloud.bus.trace.enabled=true</code>. If you do this then the
|
||||
Spring Boot <code class="literal">TraceRepository</code> (if it is present) will show each event
|
||||
sent and all the acks from each service instance. Example (from the
|
||||
<code class="literal">/trace</code> endpoint):</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"timestamp"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"2015-11-26T10:24:44.411+0000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"info"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"signal"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"spring.cloud.bus.ack"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"type"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"RefreshRemoteApplicationEvent"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"id"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"c4d374b7-58ea-4928-a312-31984def293b"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"origin"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"stores:8081"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"destination"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"*:**"</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">},</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"timestamp"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"2015-11-26T10:24:41.864+0000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"info"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"signal"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"spring.cloud.bus.sent"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"type"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"RefreshRemoteApplicationEvent"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"id"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"c4d374b7-58ea-4928-a312-31984def293b"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"origin"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"customers:9000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"destination"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"*:**"</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">},</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"timestamp"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"2015-11-26T10:24:41.862+0000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"info"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">{</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"signal"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"spring.cloud.bus.ack"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"type"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"RefreshRemoteApplicationEvent"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"id"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"c4d374b7-58ea-4928-a312-31984def293b"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"origin"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"customers:9000"</span><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">,</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"destination"</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"*:**"</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">}</span></pre><p>This trace shows that a <code class="literal">RefreshRemoteApplicationEvent</code> was sent from
|
||||
<code class="literal">customers:9000</code>, broadcast to all services, and it was received
|
||||
(acked) by <code class="literal">customers:9000</code> and <code class="literal">stores:8081</code>.</p><p>To handle the ack signals yourself you could add an <code class="literal">@EventListener</code>
|
||||
for the <code class="literal">AckRemoteApplicationEvent</code> and <code class="literal">SentApplicationEvent</code> types
|
||||
to your app (and enable tracing). Or you could tap into the
|
||||
<code class="literal">TraceRepository</code> and mine the data from there.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>Any Bus application can trace acks, but sometimes it will be
|
||||
useful to do this in a central service that can do more complex
|
||||
queries on the data. Or forward it to a specialized tracing service.</p></td></tr></table></div></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_broadcasting_your_own_events" href="#_broadcasting_your_own_events"></a>7. Broadcasting Your Own Events</h1></div></div></div><p>The Bus can carry any event of type <code class="literal">RemoteApplicationEvent</code>, but the
|
||||
default transport is JSON and the deserializer needs to know which
|
||||
types are going to be used ahead of time. To register a new type it
|
||||
needs to be in a subpackage of <code class="literal">org.springframework.cloud.bus.event</code>.</p><p>To customise the event name you can use <code class="literal">@JsonTypeName</code> on your custom class
|
||||
or rely on the default strategy which is to use the simple name of the class.
|
||||
Note that both the producer and the consumer will need access to the class
|
||||
definition.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_registering_events_in_custom_packages" href="#_registering_events_in_custom_packages"></a>7.1 Registering events in custom packages</h2></div></div></div><p>If you cannot or don’t want to use a subpackage of <code class="literal">org.springframework.cloud.bus.event</code>
|
||||
for your custom events, you must specify which packages to scan for events of
|
||||
type <code class="literal">RemoteApplicationEvent</code> using <code class="literal">@RemoteApplicationEventScan</code>. Packages
|
||||
specified with <code class="literal">@RemoteApplicationEventScan</code> include subpackages.</p><p>For example, if you have a custom event called <code class="literal">FooEvent</code>:</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">package</span> com.acme;
|
||||
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> FooEvent <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">extends</span> RemoteApplicationEvent {
|
||||
...
|
||||
}</pre><p>you can register this event with the deserializer in the following way:</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">package</span> com.acme;
|
||||
|
||||
<em><span class="hl-annotation" style="color: gray">@Configuration</span></em>
|
||||
<em><span class="hl-annotation" style="color: gray">@RemoteApplicationEventScan</span></em>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> BusConfiguration {
|
||||
...
|
||||
}</pre><p>Without specifying a value, the package of the class where <code class="literal">@RemoteApplicationEventScan</code>
|
||||
is used will be registered. In this example <code class="literal">com.acme</code> will be registered using the
|
||||
package of <code class="literal">BusConfiguration</code>.</p><p>You can also explicitly specify the packages to scan using the <code class="literal">value</code>, <code class="literal">basePackages</code> or
|
||||
<code class="literal">basePackageClasses</code> properties on <code class="literal">@RemoteApplicationEventScan</code>. For example:</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">package</span> com.acme;
|
||||
|
||||
<em><span class="hl-annotation" style="color: gray">@Configuration</span></em>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">//@RemoteApplicationEventScan({"com.acme", "foo.bar"})</span>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">//@RemoteApplicationEventScan(basePackages = {"com.acme", "foo.bar", "fizz.buzz"})</span>
|
||||
<em><span class="hl-annotation" style="color: gray">@RemoteApplicationEventScan(basePackageClasses = BusConfiguration.class)</span></em>
|
||||
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> BusConfiguration {
|
||||
...
|
||||
}</pre><p>All examples of <code class="literal">@RemoteApplicationEventScan</code> above are equivalent,
|
||||
in that the <code class="literal">com.acme</code> package will be registered by explicitly specifying the
|
||||
packages on <code class="literal">@RemoteApplicationEventScan</code>. Note, you can specify multiple base
|
||||
packages to scan.</p></div></div></div></body></html>
|
||||
12
spring-cloud-bus-parent.iml
Normal file
12
spring-cloud-bus-parent.iml
Normal file
@@ -0,0 +1,12 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
|
||||
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_7">
|
||||
<output url="file://$MODULE_DIR$/target/classes" />
|
||||
<output-test url="file://$MODULE_DIR$/target/test-classes" />
|
||||
<content url="file://$MODULE_DIR$">
|
||||
<excludeFolder url="file://$MODULE_DIR$/target" />
|
||||
</content>
|
||||
<orderEntry type="inheritedJdk" />
|
||||
<orderEntry type="sourceFolder" forTests="false" />
|
||||
</component>
|
||||
</module>
|
||||
@@ -4,690 +4,108 @@
|
||||
<meta charset="UTF-8">
|
||||
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||||
<meta name="generator" content="Asciidoctor 1.5.3">
|
||||
<title>Spring Cloud Bus</title>
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
|
||||
<meta name="generator" content="Asciidoctor 1.5.5">
|
||||
<title>spring-cloud-bus</title>
|
||||
<link rel="stylesheet" href="css/manual-singlepage.css">
|
||||
<style>
|
||||
/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
|
||||
/* Remove comment around @import statement below when using as a custom stylesheet */
|
||||
/*@import "https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700";*/
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||||
article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block}
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||||
[hidden],template{display:none}
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||||
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||||
html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}
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||||
body{margin:0}
|
||||
a{background:transparent}
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||||
a:focus{outline:thin dotted}
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||||
a:active,a:hover{outline:0}
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||||
h1{font-size:2em;margin:.67em 0}
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||||
abbr[title]{border-bottom:1px dotted}
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b,strong{font-weight:bold}
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dfn{font-style:italic}
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hr{-moz-box-sizing:content-box;box-sizing:content-box;height:0}
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pre{white-space:pre-wrap}
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|
||||
small{font-size:80%}
|
||||
sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}
|
||||
sup{top:-.5em}
|
||||
sub{bottom:-.25em}
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img{border:0}
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||||
svg:not(:root){overflow:hidden}
|
||||
figure{margin:0}
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||||
fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}
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legend{border:0;padding:0}
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button,input,select,textarea{font-family:inherit;font-size:100%;margin:0}
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button,input{line-height:normal}
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||||
button,select{text-transform:none}
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button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer}
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button[disabled],html input[disabled]{cursor:default}
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input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none}
|
||||
button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}
|
||||
textarea{overflow:auto;vertical-align:top}
|
||||
table{border-collapse:collapse;border-spacing:0}
|
||||
*,*:before,*:after{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}
|
||||
html,body{font-size:100%}
|
||||
body{background:#fff;color:rgba(0,0,0,.8);padding:0;margin:0;font-family:"Noto Serif","DejaVu Serif",serif;font-weight:400;font-style:normal;line-height:1;position:relative;cursor:auto}
|
||||
a:hover{cursor:pointer}
|
||||
img,object,embed{max-width:100%;height:auto}
|
||||
object,embed{height:100%}
|
||||
img{-ms-interpolation-mode:bicubic}
|
||||
.left{float:left!important}
|
||||
.right{float:right!important}
|
||||
.text-left{text-align:left!important}
|
||||
.text-right{text-align:right!important}
|
||||
.text-center{text-align:center!important}
|
||||
.text-justify{text-align:justify!important}
|
||||
.hide{display:none}
|
||||
body{-webkit-font-smoothing:antialiased}
|
||||
img,object,svg{display:inline-block;vertical-align:middle}
|
||||
textarea{height:auto;min-height:50px}
|
||||
select{width:100%}
|
||||
.center{margin-left:auto;margin-right:auto}
|
||||
.spread{width:100%}
|
||||
p.lead,.paragraph.lead>p,#preamble>.sectionbody>.paragraph:first-of-type p{font-size:1.21875em;line-height:1.6}
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||||
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|
||||
function addBlockSwitches() {
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
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|
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|
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|
||||
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|
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|
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|
||||
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|
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
</script>
|
||||
</head>
|
||||
|
||||
<body class="article">
|
||||
<div id="header">
|
||||
<h1>Spring Cloud Bus</h1>
|
||||
<div id="toc" class="toc">
|
||||
<div id="toctitle">Table of Contents</div>
|
||||
<ul class="sectlevel1">
|
||||
<li><a href="#_quick_start">Quick Start</a></li>
|
||||
<li><a href="#_addressing_an_instance">Addressing an Instance</a></li>
|
||||
<li><a href="#_addressing_all_instances_of_a_service">Addressing all instances of a service</a></li>
|
||||
<li><a href="#_application_context_id_must_be_unique">Application Context ID must be unique</a></li>
|
||||
<li><a href="#_customizing_the_message_broker">Customizing the Message Broker</a></li>
|
||||
<li><a href="#_tracing_bus_events">Tracing Bus Events</a></li>
|
||||
<li><a href="#_broadcasting_your_own_events">Broadcasting Your Own Events</a>
|
||||
<ul class="sectlevel2">
|
||||
<li><a href="#_registering_events_in_custom_packages">Registering events in custom packages</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
<h1>spring-cloud-bus</h1>
|
||||
</div>
|
||||
<div id="content">
|
||||
<div id="preamble">
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions. A key idea is that the Bus is like a distributed Actuator for a Spring Boot application that is scaled out, but it can also be used as a communication channel between apps. Starters are provided for an AMQP broker as the transport or for Kafka, but the same basic feature set (and some more depending on the transport) is on the roadmap for other transports.</p>
|
||||
</div>
|
||||
<div class="admonitionblock note">
|
||||
<table>
|
||||
<tr>
|
||||
<td class="icon">
|
||||
<div class="title">Note</div>
|
||||
</td>
|
||||
<td class="content">
|
||||
Spring Cloud is released under the non-restrictive Apache 2.0 license. If you would like to contribute to this section of the documentation or if you find an error, please find the source code and issue trackers in the project at <a href="https://github.com/spring-cloud/spring-cloud-config/tree/master/docs/src/main/asciidoc">github</a>.
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<p>1.3.2.BUILD-SNAPSHOT</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_quick_start">Quick Start</h2>
|
||||
<h2 id="_pick_the_documentation_option">Pick The Documentation Option</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>Spring Cloud Bus works by adding Spring Boot autconfiguration if it detects itself on the classpath. All you need to do to enable the bus is to add <code>spring-cloud-starter-bus-amqp</code> or <code>spring-cloud-starter-bus-kafka</code> to your dependency management and Spring Cloud takes care of the rest. Make sure the broker (RabbitMQ or Kafka) is available and configured: running on localhost you shouldn’t have to do anything, but if you are running remotely use Spring Cloud Connectors, or Spring Boot conventions to define the broker credentials, e.g. for Rabbit</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="title">application.yml</div>
|
||||
<div class="content">
|
||||
<pre>spring:
|
||||
rabbitmq:
|
||||
host: mybroker.com
|
||||
port: 5672
|
||||
username: user
|
||||
password: secret</pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>The bus currently supports sending messages to all nodes listening or all nodes for a particular service (as defined by Eureka). More selector criteria may be added in the future (ie. only service X nodes in data center Y, etc…​). There are also some http endpoints under the <code>/bus/*</code> actuator namespace. There are currently two implemented. The first, <code>/bus/env</code>, sends key/value pairs to update each node’s Spring Environment. The second, <code>/bus/refresh</code>, will reload each application’s configuration, just as if they had all been pinged on their <code>/refresh</code> endpoint.</p>
|
||||
</div>
|
||||
<div class="admonitionblock note">
|
||||
<table>
|
||||
<tr>
|
||||
<td class="icon">
|
||||
<div class="title">Note</div>
|
||||
</td>
|
||||
<td class="content">
|
||||
The Bus starters cover Rabbit and Kafka, because those are the two most common implementations, but Spring Cloud Stream is quite flexible and binder will work combined with <code>spring-cloud-bus</code>.
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_addressing_an_instance">Addressing an Instance</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>The HTTP endpoints accept a "destination" parameter, e.g. "/bus/refresh?destination=customers:9000", where the destination is an <code>ApplicationContext</code> ID. If the ID is owned by an instance on the Bus then it will process the message and all other instances will ignore it. Spring Boot sets the ID for you in the <code>ContextIdApplicationContextInitializer</code> to a combination of the <code>spring.application.name</code>, active profiles and <code>server.port</code> by default.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_addressing_all_instances_of_a_service">Addressing all instances of a service</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>The "destination" parameter is used in a Spring <code>PathMatcher</code> (with the path separator as a colon <code>:</code>) to determine if an instance will process the message. Using the example from above, "/bus/refresh?destination=customers:**" will target all instances of the "customers" service regardless of the profiles and ports set as the <code>ApplicationContext</code> ID.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_application_context_id_must_be_unique">Application Context ID must be unique</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>The bus tries to eliminate processing an event twice, once from the original <code>ApplicationEvent</code> and once from the queue. To do this, it checks the sending application context id againts the current application context id. If multiple instances of a service have the same application context id, events will not be processed. Running on a local machine, each service will be on a different port and that will be part of the application context id. Cloud Foundry supplies an index to differentiate. To ensure that the application context id is the unique, set <code>spring.application.index</code> to something unique for each instance of a service. For example, in lattice, set <code>spring.application.index=${INSTANCE_INDEX}</code> in application.properties (or bootstrap.properties if using configserver).</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_customizing_the_message_broker">Customizing the Message Broker</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>Spring Cloud Bus uses
|
||||
<a href="https://cloud.spring.io/spring-cloud-stream">Spring Cloud Stream</a> to
|
||||
broadcast the messages so to get messages to flow you only need to
|
||||
include the binder implementation of your choice in the
|
||||
classpath. There are convenient starters specifically for the bus with
|
||||
AMQP (RabbitMQ) and Kafka
|
||||
(<code>spring-cloud-starter-bus-[amqp,kafka]</code>). Generally speaking
|
||||
Spring Cloud Stream relies on Spring Boot autoconfiguration
|
||||
conventions for configuring middleware, so for instance the AMQP
|
||||
broker address can be changed with <code>spring.rabbitmq.*</code>
|
||||
configuration properties. Spring Cloud Bus has a handful of native
|
||||
configuration properties in <code>spring.cloud.bus.*</code>
|
||||
(e.g. <code>spring.cloud.bus.destination</code> is the name of the topic to use
|
||||
the the externall middleware). Normally the defaults will suffice.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>To lean more about how to customize the message broker settings
|
||||
consult the Spring Cloud Stream documentation.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_tracing_bus_events">Tracing Bus Events</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>Bus events (subclasses of <code>RemoteApplicationEvent</code>) can be traced by
|
||||
setting <code>spring.cloud.bus.trace.enabled=true</code>. If you do this then the
|
||||
Spring Boot <code>TraceRepository</code> (if it is present) will show each event
|
||||
sent and all the acks from each service instance. Example (from the
|
||||
<code>/trace</code> endpoint):</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="content">
|
||||
<pre class="prettyprint highlight"><code class="language-json" data-lang="json">{
|
||||
"timestamp": "2015-11-26T10:24:44.411+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.ack",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "stores:8081",
|
||||
"destination": "*:**"
|
||||
}
|
||||
},
|
||||
{
|
||||
"timestamp": "2015-11-26T10:24:41.864+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.sent",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "customers:9000",
|
||||
"destination": "*:**"
|
||||
}
|
||||
},
|
||||
{
|
||||
"timestamp": "2015-11-26T10:24:41.862+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.ack",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "customers:9000",
|
||||
"destination": "*:**"
|
||||
}
|
||||
}</code></pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>This trace shows that a <code>RefreshRemoteApplicationEvent</code> was sent from
|
||||
<code>customers:9000</code>, broadcast to all services, and it was received
|
||||
(acked) by <code>customers:9000</code> and <code>stores:8081</code>.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>To handle the ack signals yourself you could add an <code>@EventListener</code>
|
||||
for the <code>AckRemoteApplicationEvent</code> and <code>SentApplicationEvent</code> types
|
||||
to your app (and enable tracing). Or you could tap into the
|
||||
<code>TraceRepository</code> and mine the data from there.</p>
|
||||
</div>
|
||||
<div class="admonitionblock note">
|
||||
<table>
|
||||
<tr>
|
||||
<td class="icon">
|
||||
<div class="title">Note</div>
|
||||
</td>
|
||||
<td class="content">
|
||||
Any Bus application can trace acks, but sometimes it will be
|
||||
useful to do this in a central service that can do more complex
|
||||
queries on the data. Or forward it to a specialized tracing service.
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_broadcasting_your_own_events">Broadcasting Your Own Events</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>The Bus can carry any event of type <code>RemoteApplicationEvent</code>, but the
|
||||
default transport is JSON and the deserializer needs to know which
|
||||
types are going to be used ahead of time. To register a new type it
|
||||
needs to be in a subpackage of <code>org.springframework.cloud.bus.event</code>.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>To customise the event name you can use <code>@JsonTypeName</code> on your custom class
|
||||
or rely on the default strategy which is to use the simple name of the class.
|
||||
Note that both the producer and the consumer will need access to the class
|
||||
definition.</p>
|
||||
</div>
|
||||
<div class="sect2">
|
||||
<h3 id="_registering_events_in_custom_packages">Registering events in custom packages</h3>
|
||||
<div class="paragraph">
|
||||
<p>If you cannot or don’t want to use a subpackage of <code>org.springframework.cloud.bus.event</code>
|
||||
for your custom events, you must specify which packages to scan for events of
|
||||
type <code>RemoteApplicationEvent</code> using <code>@RemoteApplicationEventScan</code>. Packages
|
||||
specified with <code>@RemoteApplicationEventScan</code> include subpackages.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>For example, if you have a custom event called <code>FooEvent</code>:</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="content">
|
||||
<pre class="prettyprint highlight"><code class="language-java" data-lang="java">package com.acme;
|
||||
|
||||
public class FooEvent extends RemoteApplicationEvent {
|
||||
...
|
||||
}</code></pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>you can register this event with the deserializer in the following way:</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="content">
|
||||
<pre class="prettyprint highlight"><code class="language-java" data-lang="java">package com.acme;
|
||||
|
||||
@Configuration
|
||||
@RemoteApplicationEventScan
|
||||
public class BusConfiguration {
|
||||
...
|
||||
}</code></pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>Without specifying a value, the package of the class where <code>@RemoteApplicationEventScan</code>
|
||||
is used will be registered. In this example <code>com.acme</code> will be registered using the
|
||||
package of <code>BusConfiguration</code>.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>You can also explicitly specify the packages to scan using the <code>value</code>, <code>basePackages</code> or
|
||||
<code>basePackageClasses</code> properties on <code>@RemoteApplicationEventScan</code>. For example:</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="content">
|
||||
<pre class="prettyprint highlight"><code class="language-java" data-lang="java">package com.acme;
|
||||
|
||||
@Configuration
|
||||
//@RemoteApplicationEventScan({"com.acme", "foo.bar"})
|
||||
//@RemoteApplicationEventScan(basePackages = {"com.acme", "foo.bar", "fizz.buzz"})
|
||||
@RemoteApplicationEventScan(basePackageClasses = BusConfiguration.class)
|
||||
public class BusConfiguration {
|
||||
...
|
||||
}</code></pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>All examples of <code>@RemoteApplicationEventScan</code> above are equivalent,
|
||||
in that the <code>com.acme</code> package will be registered by explicitly specifying the
|
||||
packages on <code>@RemoteApplicationEventScan</code>. Note, you can specify multiple base
|
||||
packages to scan.</p>
|
||||
</div>
|
||||
<div class="ulist">
|
||||
<ul>
|
||||
<li>
|
||||
<p><a href="single/spring-cloud-bus.html">Single HTML</a></p>
|
||||
</li>
|
||||
<li>
|
||||
<p><a href="multi/multi_spring-cloud-bus.html">Multi HTML</a></p>
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
166
spring-cloud-bus.xml
Normal file
166
spring-cloud-bus.xml
Normal file
@@ -0,0 +1,166 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<?asciidoc-toc?>
|
||||
<?asciidoc-numbered?>
|
||||
<book xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:lang="en">
|
||||
<info>
|
||||
<title>Spring Cloud Bus</title>
|
||||
<date>2017-08-29</date>
|
||||
</info>
|
||||
<preface>
|
||||
<title></title>
|
||||
<simpara>Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions. A key idea is that the Bus is like a distributed Actuator for a Spring Boot application that is scaled out, but it can also be used as a communication channel between apps. Starters are provided for an AMQP broker as the transport or for Kafka, but the same basic feature set (and some more depending on the transport) is on the roadmap for other transports.</simpara>
|
||||
<note>
|
||||
<simpara>Spring Cloud is released under the non-restrictive Apache 2.0 license. If you would like to contribute to this section of the documentation or if you find an error, please find the source code and issue trackers in the project at <link xl:href="https://github.com/spring-cloud/spring-cloud-config/tree/master/docs/src/main/asciidoc">github</link>.</simpara>
|
||||
</note>
|
||||
</preface>
|
||||
<chapter xml:id="_quick_start">
|
||||
<title>Quick Start</title>
|
||||
<simpara>Spring Cloud Bus works by adding Spring Boot autconfiguration if it detects itself on the classpath. All you need to do to enable the bus is to add <literal>spring-cloud-starter-bus-amqp</literal> or <literal>spring-cloud-starter-bus-kafka</literal> to your dependency management and Spring Cloud takes care of the rest. Make sure the broker (RabbitMQ or Kafka) is available and configured: running on localhost you shouldn’t have to do anything, but if you are running remotely use Spring Cloud Connectors, or Spring Boot conventions to define the broker credentials, e.g. for Rabbit</simpara>
|
||||
<formalpara>
|
||||
<title>application.yml</title>
|
||||
<para>
|
||||
<screen>spring:
|
||||
rabbitmq:
|
||||
host: mybroker.com
|
||||
port: 5672
|
||||
username: user
|
||||
password: secret</screen>
|
||||
</para>
|
||||
</formalpara>
|
||||
<simpara>The bus currently supports sending messages to all nodes listening or all nodes for a particular service (as defined by Eureka). More selector criteria may be added in the future (ie. only service X nodes in data center Y, etc…​). There are also some http endpoints under the <literal>/bus/*</literal> actuator namespace. There are currently two implemented. The first, <literal>/bus/env</literal>, sends key/value pairs to update each node’s Spring Environment. The second, <literal>/bus/refresh</literal>, will reload each application’s configuration, just as if they had all been pinged on their <literal>/refresh</literal> endpoint.</simpara>
|
||||
<note>
|
||||
<simpara>The Bus starters cover Rabbit and Kafka, because those are the two most common implementations, but Spring Cloud Stream is quite flexible and binder will work combined with <literal>spring-cloud-bus</literal>.</simpara>
|
||||
</note>
|
||||
</chapter>
|
||||
<chapter xml:id="_addressing_an_instance">
|
||||
<title>Addressing an Instance</title>
|
||||
<simpara>The HTTP endpoints accept a "destination" parameter, e.g. "/bus/refresh?destination=customers:9000", where the destination is an <literal>ApplicationContext</literal> ID. If the ID is owned by an instance on the Bus then it will process the message and all other instances will ignore it. Spring Boot sets the ID for you in the <literal>ContextIdApplicationContextInitializer</literal> to a combination of the <literal>spring.application.name</literal>, active profiles and <literal>server.port</literal> by default.</simpara>
|
||||
</chapter>
|
||||
<chapter xml:id="_addressing_all_instances_of_a_service">
|
||||
<title>Addressing all instances of a service</title>
|
||||
<simpara>The "destination" parameter is used in a Spring <literal>PathMatcher</literal> (with the path separator as a colon <literal>:</literal>) to determine if an instance will process the message. Using the example from above, "/bus/refresh?destination=customers:**" will target all instances of the "customers" service regardless of the profiles and ports set as the <literal>ApplicationContext</literal> ID.</simpara>
|
||||
</chapter>
|
||||
<chapter xml:id="_application_context_id_must_be_unique">
|
||||
<title>Application Context ID must be unique</title>
|
||||
<simpara>The bus tries to eliminate processing an event twice, once from the original <literal>ApplicationEvent</literal> and once from the queue. To do this, it checks the sending application context id againts the current application context id. If multiple instances of a service have the same application context id, events will not be processed. Running on a local machine, each service will be on a different port and that will be part of the application context id. Cloud Foundry supplies an index to differentiate. To ensure that the application context id is the unique, set <literal>spring.application.index</literal> to something unique for each instance of a service. For example, in lattice, set <literal>spring.application.index=${INSTANCE_INDEX}</literal> in application.properties (or bootstrap.properties if using configserver).</simpara>
|
||||
</chapter>
|
||||
<chapter xml:id="_customizing_the_message_broker">
|
||||
<title>Customizing the Message Broker</title>
|
||||
<simpara>Spring Cloud Bus uses
|
||||
<link xl:href="https://cloud.spring.io/spring-cloud-stream">Spring Cloud Stream</link> to
|
||||
broadcast the messages so to get messages to flow you only need to
|
||||
include the binder implementation of your choice in the
|
||||
classpath. There are convenient starters specifically for the bus with
|
||||
AMQP (RabbitMQ) and Kafka
|
||||
(<literal>spring-cloud-starter-bus-[amqp,kafka]</literal>). Generally speaking
|
||||
Spring Cloud Stream relies on Spring Boot autoconfiguration
|
||||
conventions for configuring middleware, so for instance the AMQP
|
||||
broker address can be changed with <literal>spring.rabbitmq.*</literal>
|
||||
configuration properties. Spring Cloud Bus has a handful of native
|
||||
configuration properties in <literal>spring.cloud.bus.*</literal>
|
||||
(e.g. <literal>spring.cloud.bus.destination</literal> is the name of the topic to use
|
||||
the the externall middleware). Normally the defaults will suffice.</simpara>
|
||||
<simpara>To lean more about how to customize the message broker settings
|
||||
consult the Spring Cloud Stream documentation.</simpara>
|
||||
</chapter>
|
||||
<chapter xml:id="_tracing_bus_events">
|
||||
<title>Tracing Bus Events</title>
|
||||
<simpara>Bus events (subclasses of <literal>RemoteApplicationEvent</literal>) can be traced by
|
||||
setting <literal>spring.cloud.bus.trace.enabled=true</literal>. If you do this then the
|
||||
Spring Boot <literal>TraceRepository</literal> (if it is present) will show each event
|
||||
sent and all the acks from each service instance. Example (from the
|
||||
<literal>/trace</literal> endpoint):</simpara>
|
||||
<programlisting language="json" linenumbering="unnumbered">{
|
||||
"timestamp": "2015-11-26T10:24:44.411+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.ack",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "stores:8081",
|
||||
"destination": "*:**"
|
||||
}
|
||||
},
|
||||
{
|
||||
"timestamp": "2015-11-26T10:24:41.864+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.sent",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "customers:9000",
|
||||
"destination": "*:**"
|
||||
}
|
||||
},
|
||||
{
|
||||
"timestamp": "2015-11-26T10:24:41.862+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.ack",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "customers:9000",
|
||||
"destination": "*:**"
|
||||
}
|
||||
}</programlisting>
|
||||
<simpara>This trace shows that a <literal>RefreshRemoteApplicationEvent</literal> was sent from
|
||||
<literal>customers:9000</literal>, broadcast to all services, and it was received
|
||||
(acked) by <literal>customers:9000</literal> and <literal>stores:8081</literal>.</simpara>
|
||||
<simpara>To handle the ack signals yourself you could add an <literal>@EventListener</literal>
|
||||
for the <literal>AckRemoteApplicationEvent</literal> and <literal>SentApplicationEvent</literal> types
|
||||
to your app (and enable tracing). Or you could tap into the
|
||||
<literal>TraceRepository</literal> and mine the data from there.</simpara>
|
||||
<note>
|
||||
<simpara>Any Bus application can trace acks, but sometimes it will be
|
||||
useful to do this in a central service that can do more complex
|
||||
queries on the data. Or forward it to a specialized tracing service.</simpara>
|
||||
</note>
|
||||
</chapter>
|
||||
<chapter xml:id="_broadcasting_your_own_events">
|
||||
<title>Broadcasting Your Own Events</title>
|
||||
<simpara>The Bus can carry any event of type <literal>RemoteApplicationEvent</literal>, but the
|
||||
default transport is JSON and the deserializer needs to know which
|
||||
types are going to be used ahead of time. To register a new type it
|
||||
needs to be in a subpackage of <literal>org.springframework.cloud.bus.event</literal>.</simpara>
|
||||
<simpara>To customise the event name you can use <literal>@JsonTypeName</literal> on your custom class
|
||||
or rely on the default strategy which is to use the simple name of the class.
|
||||
Note that both the producer and the consumer will need access to the class
|
||||
definition.</simpara>
|
||||
<section xml:id="_registering_events_in_custom_packages">
|
||||
<title>Registering events in custom packages</title>
|
||||
<simpara>If you cannot or don’t want to use a subpackage of <literal>org.springframework.cloud.bus.event</literal>
|
||||
for your custom events, you must specify which packages to scan for events of
|
||||
type <literal>RemoteApplicationEvent</literal> using <literal>@RemoteApplicationEventScan</literal>. Packages
|
||||
specified with <literal>@RemoteApplicationEventScan</literal> include subpackages.</simpara>
|
||||
<simpara>For example, if you have a custom event called <literal>FooEvent</literal>:</simpara>
|
||||
<programlisting language="java" linenumbering="unnumbered">package com.acme;
|
||||
|
||||
public class FooEvent extends RemoteApplicationEvent {
|
||||
...
|
||||
}</programlisting>
|
||||
<simpara>you can register this event with the deserializer in the following way:</simpara>
|
||||
<programlisting language="java" linenumbering="unnumbered">package com.acme;
|
||||
|
||||
@Configuration
|
||||
@RemoteApplicationEventScan
|
||||
public class BusConfiguration {
|
||||
...
|
||||
}</programlisting>
|
||||
<simpara>Without specifying a value, the package of the class where <literal>@RemoteApplicationEventScan</literal>
|
||||
is used will be registered. In this example <literal>com.acme</literal> will be registered using the
|
||||
package of <literal>BusConfiguration</literal>.</simpara>
|
||||
<simpara>You can also explicitly specify the packages to scan using the <literal>value</literal>, <literal>basePackages</literal> or
|
||||
<literal>basePackageClasses</literal> properties on <literal>@RemoteApplicationEventScan</literal>. For example:</simpara>
|
||||
<programlisting language="java" linenumbering="unnumbered">package com.acme;
|
||||
|
||||
@Configuration
|
||||
//@RemoteApplicationEventScan({"com.acme", "foo.bar"})
|
||||
//@RemoteApplicationEventScan(basePackages = {"com.acme", "foo.bar", "fizz.buzz"})
|
||||
@RemoteApplicationEventScan(basePackageClasses = BusConfiguration.class)
|
||||
public class BusConfiguration {
|
||||
...
|
||||
}</programlisting>
|
||||
<simpara>All examples of <literal>@RemoteApplicationEventScan</literal> above are equivalent,
|
||||
in that the <literal>com.acme</literal> package will be registered by explicitly specifying the
|
||||
packages on <literal>@RemoteApplicationEventScan</literal>. Note, you can specify multiple base
|
||||
packages to scan.</simpara>
|
||||
</section>
|
||||
</chapter>
|
||||
</book>
|
||||
Reference in New Issue
Block a user