676 lines
42 KiB
HTML
676 lines
42 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="Asciidoctor 1.5.0">
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<title>Spring Cloud Core</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic|Noto+Serif:400,400italic,700,700italic|Droid+Sans+Mono:400">
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<style>
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/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
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/* Remove the comments around the @import statement below when using this as a custom stylesheet */
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/*@import "https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic|Noto+Serif:400,400italic,700,700italic|Droid+Sans+Mono:400";*/
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table.pyhltable{border-collapse:separate;border:0;margin-bottom:0;background:none}
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table.pyhltable td.code{padding-left:.75em;padding-right:0}
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table thead th,table tfoot th{font-weight:bold}
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ul.inline>li>*{display:block}
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a.image{text-decoration:none}
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span.footnote,span.footnoteref{vertical-align:super;font-size:.875em}
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span.footnote a,span.footnoteref a{text-decoration:none}
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span.footnote a:active,span.footnoteref a:active{text-decoration:underline}
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#footnotes{padding-top:.75em;padding-bottom:.75em;margin-bottom:.625em}
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#footnotes hr{width:20%;min-width:6.25em;margin:-.25em 0 .75em 0;border-width:1px 0 0 0}
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#footnotes .footnote a:first-of-type{font-weight:bold;text-decoration:none}
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#content #footnotes{margin-top:-.625em;margin-bottom:0;padding:.75em 0}
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div.unbreakable{page-break-inside:avoid}
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.navy{color:#000060}
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.olive{color:#606000}
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.purple{color:#600060}
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.purple-background{background-color:#7d007d}
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.red{color:#bf0000}
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.red-background{background-color:#fa0000}
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span.icon>.fa{cursor:default}
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.admonitionblock td.icon .icon-important:before{content:"\f06a";color:#bf0000}
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.conum[data-value]{display:inline-block;color:#fff!important;background-color:rgba(0,0,0,.8);-webkit-border-radius:100px;border-radius:100px;text-align:center;font-size:.75em;width:1.67em;height:1.67em;line-height:1.67em;font-family:"Open Sans","DejaVu Sans",sans-serif;font-style:normal;font-weight:bold}
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.conum[data-value] *{color:#fff!important}
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.conum[data-value]+b{display:none}
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.conum[data-value]:after{content:attr(data-value)}
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pre .conum[data-value]{position:relative;top:-.125em}
|
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b.conum *{color:inherit!important}
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.conum:not([data-value]):empty{display:none}
|
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h1,h2{letter-spacing:-.01em}
|
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dt,th.tableblock,td.content{text-rendering:optimizeLegibility}
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p,td.content{letter-spacing:-.01em}
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p strong,td.content strong{letter-spacing:-.005em}
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p,blockquote,dt,td.content{font-size:1.0625rem}
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p{margin-bottom:1.25rem}
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.sidebarblock p,.sidebarblock dt,.sidebarblock td.content,p.tableblock{font-size:1em}
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.exampleblock>.content{background-color:#fffef7;border-color:#e0e0dc;-webkit-box-shadow:0 1px 4px #e0e0dc;box-shadow:0 1px 4px #e0e0dc}
|
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.print-only{display:none!important}
|
|
@media print{@page{margin:1.25cm .75cm}
|
|
*{-webkit-box-shadow:none!important;box-shadow:none!important;text-shadow:none!important}
|
|
a{color:inherit!important;text-decoration:underline!important}
|
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a.bare,a[href^="#"],a[href^="mailto:"]{text-decoration:none!important}
|
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a[href^="http:"]:not(.bare):after,a[href^="https:"]:not(.bare):after,a[href^="mailto:"]:not(.bare):after{content:"(" attr(href) ")";display:inline-block;font-size:.875em;padding-left:.25em}
|
|
abbr[title]:after{content:" (" attr(title) ")"}
|
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pre,blockquote,tr,img{page-break-inside:avoid}
|
|
thead{display:table-header-group}
|
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img{max-width:100%!important}
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p,blockquote,dt,td.content{font-size:1em;orphans:3;widows:3}
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h2,h3,#toctitle,.sidebarblock>.content>.title{page-break-after:avoid}
|
|
#toc,.sidebarblock,.exampleblock>.content{background:none!important}
|
|
#toc{border-bottom:1px solid #ddddd8!important;padding-bottom:0!important}
|
|
.sect1{padding-bottom:0!important}
|
|
.sect1+.sect1{border:0!important}
|
|
#header>h1:first-child{margin-top:1.25rem}
|
|
body.book #header{text-align:center}
|
|
body.book #header>h1:first-child{border:0!important;margin:2.5em 0 1em 0}
|
|
body.book #header .details{border:0!important;display:block;padding:0!important}
|
|
body.book #header .details span:first-child{margin-left:0!important}
|
|
body.book #header .details br{display:block}
|
|
body.book #header .details br+span:before{content:none!important}
|
|
body.book #toc{border:0!important;text-align:left!important;padding:0!important;margin:0!important}
|
|
body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-break-before:always}
|
|
.listingblock code[data-lang]:before{display:block}
|
|
#footer{background:none!important;padding:0 .9375em}
|
|
#footer-text{color:rgba(0,0,0,.6)!important;font-size:.9em}
|
|
.hide-on-print{display:none!important}
|
|
.print-only{display:block!important}
|
|
.hide-for-print{display:none!important}
|
|
.show-for-print{display:inherit!important}}
|
|
</style>
|
|
<style>
|
|
/* Stylesheet for CodeRay to match GitHub theme | MIT License | http://foundation.zurb.com */
|
|
/*pre.CodeRay {background-color:#f7f7f8;}*/
|
|
.CodeRay .line-numbers{border-right:1px solid #d8d8d8;padding:0 0.5em 0 .25em}
|
|
.CodeRay span.line-numbers{display:inline-block;margin-right:.5em;color:rgba(0,0,0,.3)}
|
|
.CodeRay .line-numbers strong{font-weight: normal}
|
|
table.CodeRay{border-collapse:separate;border-spacing:0;margin-bottom:0;border:0;background:none}
|
|
table.CodeRay td{vertical-align: top}
|
|
table.CodeRay td.line-numbers{text-align:right}
|
|
table.CodeRay td.line-numbers>pre{padding:0;color:rgba(0,0,0,.3)}
|
|
table.CodeRay td.code{padding:0 0 0 .5em}
|
|
table.CodeRay td.code>pre{padding:0}
|
|
.CodeRay .debug{color:#fff !important;background:#000080 !important}
|
|
.CodeRay .annotation{color:#007}
|
|
.CodeRay .attribute-name{color:#000080}
|
|
.CodeRay .attribute-value{color:#700}
|
|
.CodeRay .binary{color:#509}
|
|
.CodeRay .comment{color:#998;font-style:italic}
|
|
.CodeRay .char{color:#04d}
|
|
.CodeRay .char .content{color:#04d}
|
|
.CodeRay .char .delimiter{color:#039}
|
|
.CodeRay .class{color:#458;font-weight:bold}
|
|
.CodeRay .complex{color:#a08}
|
|
.CodeRay .constant,.CodeRay .predefined-constant{color:#008080}
|
|
.CodeRay .color{color:#099}
|
|
.CodeRay .class-variable{color:#369}
|
|
.CodeRay .decorator{color:#b0b}
|
|
.CodeRay .definition{color:#099}
|
|
.CodeRay .delimiter{color:#000}
|
|
.CodeRay .doc{color:#970}
|
|
.CodeRay .doctype{color:#34b}
|
|
.CodeRay .doc-string{color:#d42}
|
|
.CodeRay .escape{color:#666}
|
|
.CodeRay .entity{color:#800}
|
|
.CodeRay .error{color:#808}
|
|
.CodeRay .exception{color:inherit}
|
|
.CodeRay .filename{color:#099}
|
|
.CodeRay .function{color:#900;font-weight:bold}
|
|
.CodeRay .global-variable{color:#008080}
|
|
.CodeRay .hex{color:#058}
|
|
.CodeRay .integer,.CodeRay .float{color:#099}
|
|
.CodeRay .include{color:#555}
|
|
.CodeRay .inline{color:#00}
|
|
.CodeRay .inline .inline{background:#ccc}
|
|
.CodeRay .inline .inline .inline{background:#bbb}
|
|
.CodeRay .inline .inline-delimiter{color:#d14}
|
|
.CodeRay .inline-delimiter{color:#d14}
|
|
.CodeRay .important{color:#555;font-weight:bold}
|
|
.CodeRay .interpreted{color:#b2b}
|
|
.CodeRay .instance-variable{color:#008080}
|
|
.CodeRay .label{color:#970}
|
|
.CodeRay .local-variable{color:#963}
|
|
.CodeRay .octal{color:#40e}
|
|
.CodeRay .predefined{color:#369}
|
|
.CodeRay .preprocessor{color:#579}
|
|
.CodeRay .pseudo-class{color:#555}
|
|
.CodeRay .directive{font-weight:bold}
|
|
.CodeRay .type{font-weight:bold}
|
|
.CodeRay .predefined-type{color:inherit}
|
|
.CodeRay .reserved,.CodeRay .keyword {color:#000;font-weight:bold}
|
|
.CodeRay .key{color:#808}
|
|
.CodeRay .key .delimiter{color:#606}
|
|
.CodeRay .key .char{color:#80f}
|
|
.CodeRay .value{color:#088}
|
|
.CodeRay .regexp .delimiter{color:#808}
|
|
.CodeRay .regexp .content{color:#808}
|
|
.CodeRay .regexp .modifier{color:#808}
|
|
.CodeRay .regexp .char{color:#d14}
|
|
.CodeRay .regexp .function{color:#404;font-weight:bold}
|
|
.CodeRay .string{color:#d20}
|
|
.CodeRay .string .string .string{background:#ffd0d0}
|
|
.CodeRay .string .content{color:#d14}
|
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.CodeRay .string .char{color:#d14}
|
|
.CodeRay .string .delimiter{color:#d14}
|
|
.CodeRay .shell{color:#d14}
|
|
.CodeRay .shell .delimiter{color:#d14}
|
|
.CodeRay .symbol{color:#990073}
|
|
.CodeRay .symbol .content{color:#a60}
|
|
.CodeRay .symbol .delimiter{color:#630}
|
|
.CodeRay .tag{color:#008080}
|
|
.CodeRay .tag-special{color:#d70}
|
|
.CodeRay .variable{color:#036}
|
|
.CodeRay .insert{background:#afa}
|
|
.CodeRay .delete{background:#faa}
|
|
.CodeRay .change{color:#aaf;background:#007}
|
|
.CodeRay .head{color:#f8f;background:#505}
|
|
.CodeRay .insert .insert{color:#080}
|
|
.CodeRay .delete .delete{color:#800}
|
|
.CodeRay .change .change{color:#66f}
|
|
.CodeRay .head .head{color:#f4f}
|
|
</style>
|
|
</head>
|
|
<body class="book">
|
|
<div id="header">
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<h1>Spring Cloud Core</h1>
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</div>
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<div id="content">
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<div id="preamble">
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<div class="sectionbody">
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<div id="spring-cloud-connectors-install" class="paragraph">
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<p>This core library provides programmatic access to application and service information. This library has no Spring dependencies and may be used in non-Spring applications.</p>
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</div>
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<div class="paragraph">
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<p>This library requires Java 6 or newer.</p>
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</div>
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<div class="paragraph">
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<p>This library is cloud-agnostic. Using Java SPI, it supports pluggable cloud and service connectors; support for Cloud Foundry and Heroku is available out-of-the-box, in addition to locally-provided configuration for development and testing.</p>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_connecting_to_a_cloud">Connecting to a cloud</h2>
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<div class="sectionbody">
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<div class="admonitionblock note">
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<table>
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<tr>
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<td class="icon">
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<div class="title">Note</div>
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</td>
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<td class="content">
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<div class="paragraph">
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<p>If you are using Spring Cloud in a Spring application, you should consider automatically injecting Spring beans instead.</p>
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</div>
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</td>
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</tr>
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</table>
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</div>
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<div class="ulist">
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<ul>
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<li>
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<p>Include the desired cloud connectors on the runtime classpath as described in the main documentation.</p>
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</li>
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<li>
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<p>Create a <code>CloudFactory</code> instance. Creation of a <code>CloudFactory</code> instance is a bit expensive, so using a singleton instance is recommended. If you are using a dependency injection framework such as Spring, create a bean for the <code>CloudFactory</code>.</p>
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</li>
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</ul>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="CodeRay highlight"><code data-lang="java">CloudFactory cloudFactory = <span class="keyword">new</span> CloudFactory();</code></pre>
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</div>
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</div>
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<div class="ulist">
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<ul>
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<li>
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<p>Obtain the <code>Cloud</code> object for the environment in which the application is running.</p>
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<div class="listingblock">
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<div class="content">
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<pre class="CodeRay highlight"><code data-lang="java">Cloud cloud = cloudFactory.getCloud();</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Note that you must have a <code>CloudConnector</code> suitable for your deployment environment on your classpath. For example, if you are deploying the application to Cloud Foundry, you must add cloudfoundry-connector to your classpath. If no suitable <code>CloudConnctor</code> is found, the <code>getCloud()</code> method will throw a <code>CloudException</code>.</p>
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</div>
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</li>
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<li>
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<p>Use the <code>Cloud</code> instance to access application and service information and to create service connectors.</p>
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</li>
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</ul>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="CodeRay highlight"><code data-lang="java"><span class="comment">// ServiceInfo has all the information necessary to connect to the underlying service</span>
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<span class="predefined-type">List</span><ServiceInfo> serviceInfos = cloud.getServiceInfos();</code></pre>
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</div>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="CodeRay highlight"><code data-lang="java"><span class="comment">// find the `ServiceInfo` definitions suitable for connecting to a particular service type</span>
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<span class="predefined-type">List</span><ServiceInfo> databaseInfos = cloud.getServiceInfos(<span class="predefined-type">DataSource</span>.class);</code></pre>
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</div>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="CodeRay highlight"><code data-lang="java"><span class="comment">// Alternately, let Spring Cloud create a service connector for you</span>
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<span class="predefined-type">String</span> serviceId = <span class="string"><span class="delimiter">"</span><span class="content">inventory-db</span><span class="delimiter">"</span></span>;
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<span class="predefined-type">DataSource</span> ds = cloud.getServiceConnector(serviceId, <span class="predefined-type">DataSource</span>.class, <span class="predefined-constant">null</span> <span class="comment">/* default config */</span>);</code></pre>
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</div>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_adding_cloud_connectors">Adding cloud connectors</h2>
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<div class="sectionbody">
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<div class="paragraph">
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<p>A cloud provider may extend Spring Cloud by adding a new <code>CloudConnector</code> to make Spring Cloud work with a new cloud platform. The connector is responsible for telling whether the application is running in the specific cloud, identifying application information (such as the name and instance ID of the particular running instance), and mapping bound services (such as URIs exposed in environment variables) as <code>ServiceInfo</code> objects.</p>
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</div>
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<div class="paragraph">
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<p>See the Cloud Foundry and Heroku connectors for examples.</p>
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</div>
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<div class="paragraph">
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<p>Spring Cloud uses the Java SPI to discover available connectors. New cloud connectors should list the fully-qualified class name in the provider-configuration file at</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>META-INF/services/org.springframework.cloud.CloudConnector</pre>
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</div>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_adding_service_discovery">Adding service discovery</h2>
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<div class="sectionbody">
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<div class="paragraph">
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<p>To allow Spring Cloud to discover a new type of service (<code>HelloWorldService</code>), create a <code>ServiceInfo</code> class containing the information necessary to connect to your service. If your service can be specified via a URI, extend <code>UriBasedServiceInfo</code> and provide the URI scheme in a call to the <code>super</code> constructor.</p>
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</div>
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<div class="paragraph">
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<p>This class will expose information for a service available at</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>helloworld://username:password@host:port/Bonjour</pre>
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</div>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="CodeRay highlight"><code data-lang="java"><span class="directive">public</span> <span class="type">class</span> <span class="class">HelloWorldServiceInfo</span> <span class="directive">extends</span> UriBasedServiceInfo {
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<span class="directive">public</span> <span class="directive">static</span> <span class="directive">final</span> <span class="predefined-type">String</span> URI_SCHEME = <span class="string"><span class="delimiter">"</span><span class="content">helloworld</span><span class="delimiter">"</span></span>;
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<span class="comment">// needed to support structured service definitions like Cloud Foundry</span>
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<span class="directive">public</span> HelloWorldServiceInfo(<span class="predefined-type">String</span> id, <span class="predefined-type">String</span> host, <span class="type">int</span> port, <span class="predefined-type">String</span> username, <span class="predefined-type">String</span> password, <span class="predefined-type">String</span> greeting) {
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<span class="local-variable">super</span>(id, URI_SCHEME, host, port, username, password, greeting);
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}
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<span class="comment">// needed to support URI-based service definitions like Heroku</span>
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<span class="directive">public</span> HelloWorldServiceInfo(<span class="predefined-type">String</span> id, <span class="predefined-type">String</span> uri) {
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<span class="local-variable">super</span>(id, uri);
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}
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}</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Then you will need to create a <code>ServiceInfoCreator</code> for each cloud platform you want to support. You will probably want to extend the appropriate creator base class(es), such as <code>HerokuServiceInfoCreator</code>. This is often as simple as writing a method that instantiates a new <code>HelloWorldServiceInfo</code>.</p>
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</div>
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<div class="paragraph">
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<p>Register your <code>ServiceInfoCreator</code> classes in the appropriate provider-configuration file for your cloud’s <code>ServiceInfoCreator</code> base class.</p>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_adding_service_connectors">Adding service connectors</h2>
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<div class="sectionbody">
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<div class="paragraph">
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<p>A service connector consumes a <code>ServiceInfo</code> discovered by the cloud connector and converts it into the appropriate service object, such as a <code>DataSource</code> for a service definition representing a SQL database.</p>
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</div>
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<div class="paragraph">
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<p>Service connectors may be tightly bound to the framework whose service objects they are creating; for example, some connectors in the Spring service connector create connection factories defined by Spring Data, for use in building Spring Data templates.</p>
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</div>
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<div class="paragraph">
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<p>To add new service connectors, implement <code>ServiceConnectorCreator</code> in your connector classes and list the fully-qualified class names in the provider-configuration file at</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>META-INF/services/org.springframework.cloud.service.ServiceConnectorCreator</pre>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div id="footer">
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<div id="footer-text">
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Last updated 2015-07-30 09:13:08 CDT
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