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<head>
<meta charset="UTF-8">
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<body class="book toc2 toc-left">
<div id="header">
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel0">
<li><a href="#_preface">Preface</a>
<ul class="sectlevel2">
<li><a href="#_a_brief_history_of_springs_data_integration_journey">A Brief History of Spring&#8217;s Data Integration Journey</a></li>
<li><a href="#_quick_start">Quick Start</a></li>
<li><a href="#_whats_new_in_3_0">What&#8217;s New in 3.0?</a>
<ul class="sectlevel2">
<li><a href="#spring-cloud-stream-preface-new-features">New Features and Enhancements</a></li>
<li><a href="#spring-cloud-stream-preface-notable-deprecations">Notable Deprecations</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#_appendices">Appendices</a>
<ul class="sectlevel1">
<li><a href="#building">Appendix A: Building</a>
<ul class="sectlevel2">
<li><a href="#_basic_compile_and_test">Basic Compile and Test</a></li>
<li><a href="#_documentation">Documentation</a></li>
<li><a href="#_working_with_the_code">Working with the code</a></li>
</ul>
</li>
<li><a href="#contributing">Contributing</a>
<ul class="sectlevel2">
<li><a href="#_sign_the_contributor_license_agreement">Sign the Contributor License Agreement</a></li>
<li><a href="#_code_conventions_and_housekeeping">Code Conventions and Housekeeping</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="imageblock">
<div class="content">
<a class="image" href="https://circleci.com/gh/spring-cloud/spring-cloud-stream"><img src="https://circleci.com/gh/spring-cloud/spring-cloud-stream.svg?style=svg" alt="CircleCI"></a>
</div>
</div>
<div class="imageblock">
<div class="content">
<a class="image" href="https://codecov.io/gh/spring-cloud/spring-cloud-stream"><img src="https://codecov.io/gh/spring-cloud/spring-cloud-stream/branch/master/graph/badge.svg" alt="codecov"></a>
</div>
</div>
<div class="imageblock">
<div class="content">
<a class="image" href="https://gitter.im/spring-cloud/spring-cloud-stream?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge"><img src="https://badges.gitter.im/spring-cloud/spring-cloud-stream.svg" alt="Gitter"></a>
</div>
</div>
</div>
</div>
<h1 id="_preface" class="sect0"><a class="link" href="#_preface">Preface</a></h1>
<div class="sect2">
<h3 id="_a_brief_history_of_springs_data_integration_journey"><a class="link" href="#_a_brief_history_of_springs_data_integration_journey">A Brief History of Spring&#8217;s Data Integration Journey</a></h3>
<div class="paragraph">
<p>Spring&#8217;s journey on Data Integration started with <a href="https://projects.spring.io/spring-integration/">Spring Integration</a>. With its programming model, it provided a consistent developer experience to build applications that can embrace <a href="http://www.enterpriseintegrationpatterns.com/">Enterprise Integration Patterns</a> to connect with external systems such as, databases, message brokers, and among others.</p>
</div>
<div class="paragraph">
<p>Fast forward to the cloud-era, where microservices have become prominent in the enterprise setting. <a href="https://projects.spring.io/spring-boot/">Spring Boot</a> transformed the way how developers built Applications. With Spring&#8217;s programming model and the runtime responsibilities handled by Spring Boot, it became seamless to develop stand-alone, production-grade Spring-based microservices.</p>
</div>
<div class="paragraph">
<p>To extend this to Data Integration workloads, Spring Integration and Spring Boot were put together into a new project. Spring Cloud Stream was born.</p>
</div>
<div class="paragraph">
<p>With Spring Cloud Stream, developers can:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Build, test and deploy data-centric applications in isolation.</p>
</li>
<li>
<p>Apply modern microservices architecture patterns, including composition through messaging.</p>
</li>
<li>
<p>Decouple application responsibilities with event-centric thinking. An event can represent something that has happened in time, to which the downstream consumer applications can react without knowing where it originated or the producer&#8217;s identity.</p>
</li>
<li>
<p>Port the business logic onto message brokers (such as RabbitMQ, Apache Kafka, Amazon Kinesis).</p>
</li>
<li>
<p>Rely on the framework&#8217;s automatic content-type support for common use-cases. Extending to different data conversion types is possible.</p>
</li>
<li>
<p>and many more. . .</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_quick_start"><a class="link" href="#_quick_start">Quick Start</a></h3>
<div class="paragraph">
<p>You can try Spring Cloud Stream in less then 5 min even before you jump into any details by following this three-step guide.</p>
</div>
<div class="paragraph">
<p>We show you how to create a Spring Cloud Stream application that receives messages coming from the messaging middleware of your choice (more on this later) and logs received messages to the console.
We call it <code>LoggingConsumer</code>.
While not very practical, it provides a good introduction to some of the main concepts
and abstractions, making it easier to digest the rest of this user guide.</p>
</div>
<div class="paragraph">
<p>The three steps are as follows:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p><a href="#spring-cloud-stream-preface-creating-sample-application">Creating a Sample Application by Using Spring Initializr</a></p>
</li>
<li>
<p><a href="#spring-cloud-stream-preface-importing-project">Importing the Project into Your IDE</a></p>
</li>
<li>
<p><a href="#spring-cloud-stream-preface-adding-message-handler">Adding a Message Handler, Building, and Running</a></p>
</li>
</ol>
</div>
<div class="sect3">
<h4 id="spring-cloud-stream-preface-creating-sample-application"><a class="link" href="#spring-cloud-stream-preface-creating-sample-application">Creating a Sample Application by Using Spring Initializr</a></h4>
<div class="paragraph">
<p>To get started, visit the <a href="https://start.spring.io">Spring Initializr</a>. From there, you can generate our <code>LoggingConsumer</code> application. To do so:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>In the <strong>Dependencies</strong> section, start typing <code>stream</code>.
When the &#8220;Cloud Stream&#8221; option should appears, select it.</p>
</li>
<li>
<p>Start typing either 'kafka' or 'rabbit'.</p>
</li>
<li>
<p>Select &#8220;Kafka&#8221; or &#8220;RabbitMQ&#8221;.</p>
<div class="paragraph">
<p>Basically, you choose the messaging middleware to which your application binds.
We recommend using the one you have already installed or feel more comfortable with installing and running.
Also, as you can see from the Initilaizer screen, there are a few other options you can choose.
For example, you can choose Gradle as your build tool instead of Maven (the default).</p>
</div>
</li>
<li>
<p>In the <strong>Artifact</strong> field, type 'logging-consumer'.</p>
<div class="paragraph">
<p>The value of the <strong>Artifact</strong> field becomes the application name.
If you chose RabbitMQ for the middleware, your Spring Initializr should now be as follows:</p>
</div>
</li>
</ol>
</div>
<div class="imageblock text-center">
<div class="content">
<img src="https://raw.githubusercontent.com/spring-cloud/spring-cloud-stream/master/docs/src/main/asciidoc/images/spring-initializr.png" alt="spring initializr">
</div>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Click the <strong>Generate Project</strong> button.</p>
<div class="paragraph">
<p>Doing so downloads the zipped version of the generated project to your hard drive.</p>
</div>
</li>
<li>
<p>Unzip the file into the folder you want to use as your project directory.</p>
</li>
</ol>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
We encourage you to explore the many possibilities available in the Spring Initializr.
It lets you create many different kinds of Spring applications.
</td>
</tr>
</table>
</div>
</div>
<div class="sect3">
<h4 id="spring-cloud-stream-preface-importing-project"><a class="link" href="#spring-cloud-stream-preface-importing-project">Importing the Project into Your IDE</a></h4>
<div class="paragraph">
<p>Now you can import the project into your IDE.
Keep in mind that, depending on the IDE, you may need to follow a specific import procedure.
For example, depending on how the project was generated (Maven or Gradle), you may need to follow specific import procedure (for example, in Eclipse or STS, you need to use File &#8594; Import &#8594; Maven &#8594; Existing Maven Project).</p>
</div>
<div class="paragraph">
<p>Once imported, the project must have no errors of any kind. Also, <code>src/main/java</code> should contain <code>com.example.loggingconsumer.LoggingConsumerApplication</code>.</p>
</div>
<div class="paragraph">
<p>Technically, at this point, you can run the application&#8217;s main class.
It is already a valid Spring Boot application.
However, it does not do anything, so we want to add some code.</p>
</div>
</div>
<div class="sect3">
<h4 id="spring-cloud-stream-preface-adding-message-handler"><a class="link" href="#spring-cloud-stream-preface-adding-message-handler">Adding a Message Handler, Building, and Running</a></h4>
<div class="paragraph">
<p>Modify the <code>com.example.loggingconsumer.LoggingConsumerApplication</code> class to look as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@SpringBootApplication
public class LoggingConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(LoggingConsumerApplication.class, args);
}
@Bean
public Consumer&lt;Person&gt; log() {
return person -&gt; {
System.out.println("Received: " + person);
};
}
public static class Person {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String toString() {
return this.name;
}
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>As you can see from the preceding listing:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>We are using functional programming model (see <a href="#Spring Cloud Function support">[Spring Cloud Function support]</a>) to define a single message handler as <code>Consumer</code>.</p>
</li>
<li>
<p>We are relying on framework conventions to bind such handler to the input destination binding exposed by the binder.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Doing so also lets you see one of the core features of the framework: It tries to automatically convert incoming message payloads to type <code>Person</code>.</p>
</div>
<div class="paragraph">
<p>You now have a fully functional Spring Cloud Stream application that does listens for messages.
From here, for simplicity, we assume you selected RabbitMQ in <a href="#spring-cloud-stream-preface-creating-sample-application">step one</a>.
Assuming you have RabbitMQ installed and running, you can start the application by running its <code>main</code> method in your IDE.</p>
</div>
<div class="paragraph">
<p>You should see following output:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code> --- [ main] c.s.b.r.p.RabbitExchangeQueueProvisioner : declaring queue for inbound: input.anonymous.CbMIwdkJSBO1ZoPDOtHtCg, bound to: input
--- [ main] o.s.a.r.c.CachingConnectionFactory : Attempting to connect to: [localhost:5672]
--- [ main] o.s.a.r.c.CachingConnectionFactory : Created new connection: rabbitConnectionFactory#2a3a299:0/SimpleConnection@66c83fc8. . .
. . .
--- [ main] o.s.i.a.i.AmqpInboundChannelAdapter : started inbound.input.anonymous.CbMIwdkJSBO1ZoPDOtHtCg
. . .
--- [ main] c.e.l.LoggingConsumerApplication : Started LoggingConsumerApplication in 2.531 seconds (JVM running for 2.897)</code></pre>
</div>
</div>
<div class="paragraph">
<p>Go to the RabbitMQ management console or any other RabbitMQ client and send a message to <code>input.anonymous.CbMIwdkJSBO1ZoPDOtHtCg</code>.
The <code>anonymous.CbMIwdkJSBO1ZoPDOtHtCg</code> part represents the group name and is generated, so it is bound to be different in your environment.
For something more predictable, you can use an explicit group name by setting <code>spring.cloud.stream.bindings.input.group=hello</code> (or whatever name you like).</p>
</div>
<div class="paragraph">
<p>The contents of the message should be a JSON representation of the <code>Person</code> class, as follows:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>{"name":"Sam Spade"}</pre>
</div>
</div>
<div class="paragraph">
<p>Then, in your console, you should see:</p>
</div>
<div class="paragraph">
<p><code>Received: Sam Spade</code></p>
</div>
<div class="paragraph">
<p>You can also build and package your application into a boot jar (by using <code>./mvnw clean install</code>) and run the built JAR by using the <code>java -jar</code> command.</p>
</div>
<div class="paragraph">
<p>Now you have a working (albeit very basic) Spring Cloud Stream application.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_whats_new_in_3_0"><a class="link" href="#_whats_new_in_3_0">What&#8217;s New in 3.0?</a></h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="spring-cloud-stream-preface-new-features"><a class="link" href="#spring-cloud-stream-preface-new-features">New Features and Enhancements</a></h3>
<div class="ulist">
<ul>
<li>
<p><strong>Routing Function</strong> - see <a href="#Routing with functions">[Routing with functions]</a> for more details.</p>
</li>
<li>
<p><strong>Multiple bindings with functions</strong> (multiple message handlers) - see <a href="#Multiple functions in a single application">[Multiple functions in a single application]</a> for more details.</p>
</li>
<li>
<p><strong>Functions with multiple inputs/outputs</strong> (single function that can subscribe or target multiple destinations) - see <a href="#Functions with multiple input and output arguments">[Functions with multiple input and output arguments]</a> for more details.</p>
</li>
<li>
<p><strong>Native support for reactive programming</strong> - since v3.0.0 we no longer distribute spring-cloud-stream-reactive modules and instead
relying on native reactive support provided by spring cloud function. For backward
compatibility you can still bring <code>spring-cloud-stream-reactive</code> from previous versions.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="spring-cloud-stream-preface-notable-deprecations"><a class="link" href="#spring-cloud-stream-preface-notable-deprecations">Notable Deprecations</a></h3>
<div class="ulist">
<ul>
<li>
<p><em>Reactive module</em> (<code>spring-cloud-stream-reactive</code>) is discontinued and no longer distributed in favor of native support via spring-cloud-function.
For backward
compatibility you can still bring <code>spring-cloud-stream-reactive</code> from previous versions.</p>
</li>
<li>
<p><em>Test support binder</em> <code>spring-cloud-stream-test-support</code> with MessageCollector in favor of a new test binder. See <a href="#Testing">[Testing]</a> for more details.</p>
</li>
<li>
<p><em>@StreamMessageConverter</em> - deprecated as it is no longer required.</p>
</li>
<li>
<p>The <code>original-content-type</code> header references have been removed after it&#8217;s been deprecated in v2.0.</p>
</li>
<li>
<p>The <code>BinderAwareChannelResolver</code> is deprecated in favor if providing <code>spring.cloud.stream.sendto.destination</code> property.
This is primarily for function-based programming model. For StreamListener it would still be required and thus will stay until we deprecate and eventually discontinue StreamListener
and annotation-based programming model.</p>
</li>
</ul>
</div>
</div>
</div>
</div>
<h1 id="_appendices" class="sect0"><a class="link" href="#_appendices">Appendices</a></h1>
<div class="sect1">
<h2 id="building"><a class="link" href="#building">Appendix A: Building</a></h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_basic_compile_and_test"><a class="link" href="#_basic_compile_and_test">Basic Compile and Test</a></h3>
<div class="paragraph">
<p>To build the source you will need to install JDK 1.8.</p>
</div>
<div class="paragraph">
<p>The build uses the Maven wrapper so you don&#8217;t have to install a specific
version of Maven. To enable the tests for Redis, Rabbit, and Kafka bindings you
should have those servers running before building. See below for more
information on running the servers.</p>
</div>
<div class="paragraph">
<p>The main build command is</p>
</div>
<div class="listingblock">
<div class="content">
<pre>$ ./mvnw clean install</pre>
</div>
</div>
<div class="paragraph">
<p>You can also add '-DskipTests' if you like, to avoid running the tests.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
You can also install Maven (&gt;=3.3.3) yourself and run the <code>mvn</code> command
in place of <code>./mvnw</code> in the examples below. If you do that you also
might need to add <code>-P spring</code> if your local Maven settings do not
contain repository declarations for spring pre-release artifacts.
</td>
</tr>
</table>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Be aware that you might need to increase the amount of memory
available to Maven by setting a <code>MAVEN_OPTS</code> environment variable with
a value like <code>-Xmx512m -XX:MaxPermSize=128m</code>. We try to cover this in
the <code>.mvn</code> configuration, so if you find you have to do it to make a
build succeed, please raise a ticket to get the settings added to
source control.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The projects that require middleware generally include a
<code>docker-compose.yml</code>, so consider using
<a href="http://compose.docker.io/">Docker Compose</a> to run the middeware servers
in Docker containers. See the README in the
<a href="https://github.com/spring-cloud-samples/scripts">scripts demo
repository</a> for specific instructions about the common cases of mongo,
rabbit and redis.</p>
</div>
</div>
<div class="sect2">
<h3 id="_documentation"><a class="link" href="#_documentation">Documentation</a></h3>
<div class="paragraph">
<p>There is a "full" profile that will generate documentation.</p>
</div>
</div>
<div class="sect2">
<h3 id="_working_with_the_code"><a class="link" href="#_working_with_the_code">Working with the code</a></h3>
<div class="paragraph">
<p>If you don&#8217;t have an IDE preference we would recommend that you use
<a href="http://www.springsource.com/developer/sts">Spring Tools Suite</a> or
<a href="http://eclipse.org">Eclipse</a> when working with the code. We use the
<a href="http://eclipse.org/m2e/">m2eclipe</a> eclipse plugin for maven support. Other IDEs and tools
should also work without issue.</p>
</div>
<div class="sect3">
<h4 id="_importing_into_eclipse_with_m2eclipse"><a class="link" href="#_importing_into_eclipse_with_m2eclipse">Importing into eclipse with m2eclipse</a></h4>
<div class="paragraph">
<p>We recommend the <a href="http://eclipse.org/m2e/">m2eclipe</a> eclipse plugin when working with
eclipse. If you don&#8217;t already have m2eclipse installed it is available from the "eclipse
marketplace".</p>
</div>
<div class="paragraph">
<p>Unfortunately m2e does not yet support Maven 3.3, so once the projects
are imported into Eclipse you will also need to tell m2eclipse to use
the <code>.settings.xml</code> file for the projects. If you do not do this you
may see many different errors related to the POMs in the
projects. Open your Eclipse preferences, expand the Maven
preferences, and select User Settings. In the User Settings field
click Browse and navigate to the Spring Cloud project you imported
selecting the <code>.settings.xml</code> file in that project. Click Apply and
then OK to save the preference changes.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Alternatively you can copy the repository settings from <a href="https://github.com/spring-cloud/spring-cloud-build/blob/master/.settings.xml"><code>.settings.xml</code></a> into your own <code>~/.m2/settings.xml</code>.
</td>
</tr>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_importing_into_eclipse_without_m2eclipse"><a class="link" href="#_importing_into_eclipse_without_m2eclipse">Importing into eclipse without m2eclipse</a></h4>
<div class="paragraph">
<p>If you prefer not to use m2eclipse you can generate eclipse project metadata using the
following command:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>$ ./mvnw eclipse:eclipse</pre>
</div>
</div>
<div class="paragraph">
<p>The generated eclipse projects can be imported by selecting <code>import existing projects</code>
from the <code>file</code> menu.</p>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="contributing"><a class="link" href="#contributing">Contributing</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p>Spring Cloud is released under the non-restrictive Apache 2.0 license,
and follows a very standard Github development process, using Github
tracker for issues and merging pull requests into master. If you want
to contribute even something trivial please do not hesitate, but
follow the guidelines below.</p>
</div>
<div class="sect2">
<h3 id="_sign_the_contributor_license_agreement"><a class="link" href="#_sign_the_contributor_license_agreement">Sign the Contributor License Agreement</a></h3>
<div class="paragraph">
<p>Before we accept a non-trivial patch or pull request we will need you to sign the
<a href="https://support.springsource.com/spring_committer_signup">contributor&#8217;s agreement</a>.
Signing the contributor&#8217;s agreement does not grant anyone commit rights to the main
repository, but it does mean that we can accept your contributions, and you will get an
author credit if we do. Active contributors might be asked to join the core team, and
given the ability to merge pull requests.</p>
</div>
</div>
<div class="sect2">
<h3 id="_code_conventions_and_housekeeping"><a class="link" href="#_code_conventions_and_housekeeping">Code Conventions and Housekeeping</a></h3>
<div class="paragraph">
<p>None of these is essential for a pull request, but they will all help. They can also be
added after the original pull request but before a merge.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Use the Spring Framework code format conventions. If you use Eclipse
you can import formatter settings using the
<code>eclipse-code-formatter.xml</code> file from the
<a href="https://github.com/spring-cloud/build/tree/master/eclipse-coding-conventions.xml">Spring
Cloud Build</a> project. If using IntelliJ, you can use the
<a href="http://plugins.jetbrains.com/plugin/6546">Eclipse Code Formatter
Plugin</a> to import the same file.</p>
</li>
<li>
<p>Make sure all new <code>.java</code> files to have a simple Javadoc class comment with at least an
<code>@author</code> tag identifying you, and preferably at least a paragraph on what the class is
for.</p>
</li>
<li>
<p>Add the ASF license header comment to all new <code>.java</code> files (copy from existing files
in the project)</p>
</li>
<li>
<p>Add yourself as an <code>@author</code> to the .java files that you modify substantially (more
than cosmetic changes).</p>
</li>
<li>
<p>Add some Javadocs and, if you change the namespace, some XSD doc elements.</p>
</li>
<li>
<p>A few unit tests would help a lot as well&#8201;&#8212;&#8201;someone has to do it.</p>
</li>
<li>
<p>If no-one else is using your branch, please rebase it against the current master (or
other target branch in the main project).</p>
</li>
<li>
<p>When writing a commit message please follow <a href="http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html">these conventions</a>,
if you are fixing an existing issue please add <code>Fixes gh-XXXX</code> at the end of the commit
message (where XXXX is the issue number).</p>
</li>
</ul>
</div>
</div>
</div>
</div>
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<ul class="sectlevel1">
<li><a href="#binders">Binder Implementations</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p><strong>3.0.5.RELEASE</strong></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="binders"><a class="link" href="#binders">Binder Implementations</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p>The following is the list of available binder implementations</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://cloud.spring.io/spring-cloud-stream-binder-rabbit/">RabbitMQ</a></p>
</li>
<li>
<p><a href="https://cloud.spring.io/spring-cloud-stream-binder-kafka/">Apache Kafka</a></p>
</li>
<li>
<p><a href="https://github.com/spring-cloud/spring-cloud-stream-binder-aws-kinesis">Amazon Kinesis</a></p>
</li>
<li>
<p><a href="https://github.com/spring-cloud/spring-cloud-gcp/tree/master/spring-cloud-gcp-pubsub-stream-binder">Google PubSub <em>(partner maintained)</em></a></p>
</li>
<li>
<p><a href="https://github.com/SolaceProducts/spring-cloud-stream-binder-solace">Solace PubSub+ <em>(partner maintained)</em></a></p>
</li>
<li>
<p><a href="https://github.com/Microsoft/spring-cloud-azure/tree/master/spring-cloud-azure-stream-binder/spring-cloud-azure-eventhubs-stream-binder">Azure Event Hubs <em>(partner maintained)</em></a></p>
</li>
<li>
<p><a href="https://github.com/alibaba/spring-cloud-alibaba/wiki/RocketMQ-en">Apache RocketMQ <em>(partner maintained)</em></a></p>
</li>
</ul>
</div>
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<h1>Spring Cloud Stream Reference Documentation</h1>
<div class="details">
<span id="author" class="author">Sabby Anandan</span><br>
<span id="author2" class="author">Marius Bogoevici</span><br>
<span id="author3" class="author">Eric Bottard</span><br>
<span id="author4" class="author">Mark Fisher</span><br>
<span id="author5" class="author">Ilayaperumal Gopinathan</span><br>
<span id="author6" class="author">Gunnar Hillert</span><br>
<span id="author7" class="author">Mark Pollack</span><br>
<span id="author8" class="author">Patrick Peralta</span><br>
<span id="author9" class="author">Glenn Renfro</span><br>
<span id="author10" class="author">Thomas Risberg</span><br>
<span id="author11" class="author">Dave Syer</span><br>
<span id="author12" class="author">David Turanski</span><br>
<span id="author13" class="author">Janne Valkealahti</span><br>
<span id="author14" class="author">Benjamin Klein</span><br>
<span id="author15" class="author">Vinicius Carvalho</span><br>
<span id="author16" class="author">Gary Russell</span><br>
<span id="author17" class="author">Oleg Zhurakousky</span><br>
<span id="author18" class="author">Jay Bryant</span><br>
<span id="author19" class="author">Soby Chacko</span><br>
<span id="author20" class="author">Domenico Sibilio</span><br>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p><strong>3.0.5.RELEASE</strong></p>
</div>
<div class="paragraph">
<p>The reference documentation consists of the following sections:</p>
</div>
<div class="hdlist">
<table>
<tr>
<td class="hdlist1">
<a href="spring-cloud-stream.html#spring-cloud-stream-reference">Overview</a>
</td>
<td class="hdlist2">
<p>History, Quick Start, Concepts, Architecture Overview, Binder Abstraction, and Core Features</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<a href="https://cloud.spring.io/spring-cloud-static/spring-cloud-stream/3.0.5.RELEASE/../spring-cloud-stream-binder-rabbit/spring-cloud-stream-binder-rabbit.html">Rabbit MQ Binder</a>
</td>
<td class="hdlist2">
<p>Spring Cloud Stream binder reference for Rabbit MQ</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<a href="https://cloud.spring.io/spring-cloud-static/spring-cloud-stream/3.0.5.RELEASE/../spring-cloud-stream-binder-kafka/spring-cloud-stream-binder-kafka.html#_apache_kafka_binder">Apache Kafka Binder</a>
</td>
<td class="hdlist2">
<p>Spring Cloud Stream binder reference for Apache Kafka</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<a href="https://cloud.spring.io/spring-cloud-static/spring-cloud-stream/3.0.5.RELEASE/../spring-cloud-stream-binder-kafka/spring-cloud-stream-binder-kafka.html#_kafka_streams_binder">Apache Kafka Streams Binder</a>
</td>
<td class="hdlist2">
<p>Spring Cloud Stream binder reference for Apache Kafka Streams</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<a href="binders.html#binders">Additional Binders</a>
</td>
<td class="hdlist2">
<p>A collection of Partner maintained binder implementations for Spring Cloud Stream (e.g., Azure Event Hubs, Google PubSub, Solace PubSub+)</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<a href="https://github.com/spring-cloud/spring-cloud-stream-samples/">Spring Cloud Stream Samples</a>
</td>
<td class="hdlist2">
<p>A curated collection of repeatable Spring Cloud Stream samples to walk through the features</p>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Relevant Links:</p>
</div>
<div class="hdlist">
<table>
<tr>
<td class="hdlist1">
<a href="https://cloud.spring.io/spring-cloud-dataflow/">Spring Cloud Data Flow</a>
</td>
<td class="hdlist2">
<p>Spring Cloud Data Flow</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<a href="http://www.enterpriseintegrationpatterns.com/">Enterprise Integration Patterns</a>
</td>
<td class="hdlist2">
<p>Patterns and Best Practices for Enterprise Integration</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<a href="https://spring.io/projects/spring-integration">Spring Integration</a>
</td>
<td class="hdlist2">
<p>Spring Integration framework</p>
</td>
</tr>
</table>
</div>
</div>
</div>
</div>
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<!DOCTYPE html>
<html lang="en">
<head>
<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 1.5.8">
<title>A Brief History of Spring&#8217;s Data Integration Journey</title>
<link rel="stylesheet" href="css/spring.css">
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<body class="book toc2 toc-left">
<div id="header">
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel2">
<li><a href="#_a_brief_history_of_springs_data_integration_journey">A Brief History of Spring&#8217;s Data Integration Journey</a></li>
<li><a href="#_quick_start">Quick Start</a></li>
<li><a href="#_whats_new_in_3_0">What&#8217;s New in 3.0?</a>
<ul class="sectlevel2">
<li><a href="#spring-cloud-stream-preface-new-features">New Features and Enhancements</a></li>
<li><a href="#spring-cloud-stream-preface-notable-deprecations">Notable Deprecations</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div class="sect2">
<h3 id="_a_brief_history_of_springs_data_integration_journey"><a class="link" href="#_a_brief_history_of_springs_data_integration_journey">A Brief History of Spring&#8217;s Data Integration Journey</a></h3>
<div class="paragraph">
<p>Spring&#8217;s journey on Data Integration started with <a href="https://projects.spring.io/spring-integration/">Spring Integration</a>. With its programming model, it provided a consistent developer experience to build applications that can embrace <a href="http://www.enterpriseintegrationpatterns.com/">Enterprise Integration Patterns</a> to connect with external systems such as, databases, message brokers, and among others.</p>
</div>
<div class="paragraph">
<p>Fast forward to the cloud-era, where microservices have become prominent in the enterprise setting. <a href="https://projects.spring.io/spring-boot/">Spring Boot</a> transformed the way how developers built Applications. With Spring&#8217;s programming model and the runtime responsibilities handled by Spring Boot, it became seamless to develop stand-alone, production-grade Spring-based microservices.</p>
</div>
<div class="paragraph">
<p>To extend this to Data Integration workloads, Spring Integration and Spring Boot were put together into a new project. Spring Cloud Stream was born.</p>
</div>
<div class="paragraph">
<p>With Spring Cloud Stream, developers can:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Build, test and deploy data-centric applications in isolation.</p>
</li>
<li>
<p>Apply modern microservices architecture patterns, including composition through messaging.</p>
</li>
<li>
<p>Decouple application responsibilities with event-centric thinking. An event can represent something that has happened in time, to which the downstream consumer applications can react without knowing where it originated or the producer&#8217;s identity.</p>
</li>
<li>
<p>Port the business logic onto message brokers (such as RabbitMQ, Apache Kafka, Amazon Kinesis).</p>
</li>
<li>
<p>Rely on the framework&#8217;s automatic content-type support for common use-cases. Extending to different data conversion types is possible.</p>
</li>
<li>
<p>and many more. . .</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_quick_start"><a class="link" href="#_quick_start">Quick Start</a></h3>
<div class="paragraph">
<p>You can try Spring Cloud Stream in less then 5 min even before you jump into any details by following this three-step guide.</p>
</div>
<div class="paragraph">
<p>We show you how to create a Spring Cloud Stream application that receives messages coming from the messaging middleware of your choice (more on this later) and logs received messages to the console.
We call it <code>LoggingConsumer</code>.
While not very practical, it provides a good introduction to some of the main concepts
and abstractions, making it easier to digest the rest of this user guide.</p>
</div>
<div class="paragraph">
<p>The three steps are as follows:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p><a href="#spring-cloud-stream-preface-creating-sample-application">Creating a Sample Application by Using Spring Initializr</a></p>
</li>
<li>
<p><a href="#spring-cloud-stream-preface-importing-project">Importing the Project into Your IDE</a></p>
</li>
<li>
<p><a href="#spring-cloud-stream-preface-adding-message-handler">Adding a Message Handler, Building, and Running</a></p>
</li>
</ol>
</div>
<div class="sect3">
<h4 id="spring-cloud-stream-preface-creating-sample-application"><a class="link" href="#spring-cloud-stream-preface-creating-sample-application">Creating a Sample Application by Using Spring Initializr</a></h4>
<div class="paragraph">
<p>To get started, visit the <a href="https://start.spring.io">Spring Initializr</a>. From there, you can generate our <code>LoggingConsumer</code> application. To do so:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>In the <strong>Dependencies</strong> section, start typing <code>stream</code>.
When the &#8220;Cloud Stream&#8221; option should appears, select it.</p>
</li>
<li>
<p>Start typing either 'kafka' or 'rabbit'.</p>
</li>
<li>
<p>Select &#8220;Kafka&#8221; or &#8220;RabbitMQ&#8221;.</p>
<div class="paragraph">
<p>Basically, you choose the messaging middleware to which your application binds.
We recommend using the one you have already installed or feel more comfortable with installing and running.
Also, as you can see from the Initilaizer screen, there are a few other options you can choose.
For example, you can choose Gradle as your build tool instead of Maven (the default).</p>
</div>
</li>
<li>
<p>In the <strong>Artifact</strong> field, type 'logging-consumer'.</p>
<div class="paragraph">
<p>The value of the <strong>Artifact</strong> field becomes the application name.
If you chose RabbitMQ for the middleware, your Spring Initializr should now be as follows:</p>
</div>
</li>
</ol>
</div>
<div class="imageblock text-center">
<div class="content">
<img src="https://raw.githubusercontent.com/spring-cloud/spring-cloud-stream/master/docs/src/main/asciidoc/images/spring-initializr.png" alt="spring initializr">
</div>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Click the <strong>Generate Project</strong> button.</p>
<div class="paragraph">
<p>Doing so downloads the zipped version of the generated project to your hard drive.</p>
</div>
</li>
<li>
<p>Unzip the file into the folder you want to use as your project directory.</p>
</li>
</ol>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
We encourage you to explore the many possibilities available in the Spring Initializr.
It lets you create many different kinds of Spring applications.
</td>
</tr>
</table>
</div>
</div>
<div class="sect3">
<h4 id="spring-cloud-stream-preface-importing-project"><a class="link" href="#spring-cloud-stream-preface-importing-project">Importing the Project into Your IDE</a></h4>
<div class="paragraph">
<p>Now you can import the project into your IDE.
Keep in mind that, depending on the IDE, you may need to follow a specific import procedure.
For example, depending on how the project was generated (Maven or Gradle), you may need to follow specific import procedure (for example, in Eclipse or STS, you need to use File &#8594; Import &#8594; Maven &#8594; Existing Maven Project).</p>
</div>
<div class="paragraph">
<p>Once imported, the project must have no errors of any kind. Also, <code>src/main/java</code> should contain <code>com.example.loggingconsumer.LoggingConsumerApplication</code>.</p>
</div>
<div class="paragraph">
<p>Technically, at this point, you can run the application&#8217;s main class.
It is already a valid Spring Boot application.
However, it does not do anything, so we want to add some code.</p>
</div>
</div>
<div class="sect3">
<h4 id="spring-cloud-stream-preface-adding-message-handler"><a class="link" href="#spring-cloud-stream-preface-adding-message-handler">Adding a Message Handler, Building, and Running</a></h4>
<div class="paragraph">
<p>Modify the <code>com.example.loggingconsumer.LoggingConsumerApplication</code> class to look as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@SpringBootApplication
public class LoggingConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(LoggingConsumerApplication.class, args);
}
@Bean
public Consumer&lt;Person&gt; log() {
return person -&gt; {
System.out.println("Received: " + person);
};
}
public static class Person {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String toString() {
return this.name;
}
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>As you can see from the preceding listing:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>We are using functional programming model (see <a href="#Spring Cloud Function support">[Spring Cloud Function support]</a>) to define a single message handler as <code>Consumer</code>.</p>
</li>
<li>
<p>We are relying on framework conventions to bind such handler to the input destination binding exposed by the binder.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Doing so also lets you see one of the core features of the framework: It tries to automatically convert incoming message payloads to type <code>Person</code>.</p>
</div>
<div class="paragraph">
<p>You now have a fully functional Spring Cloud Stream application that does listens for messages.
From here, for simplicity, we assume you selected RabbitMQ in <a href="#spring-cloud-stream-preface-creating-sample-application">step one</a>.
Assuming you have RabbitMQ installed and running, you can start the application by running its <code>main</code> method in your IDE.</p>
</div>
<div class="paragraph">
<p>You should see following output:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code> --- [ main] c.s.b.r.p.RabbitExchangeQueueProvisioner : declaring queue for inbound: input.anonymous.CbMIwdkJSBO1ZoPDOtHtCg, bound to: input
--- [ main] o.s.a.r.c.CachingConnectionFactory : Attempting to connect to: [localhost:5672]
--- [ main] o.s.a.r.c.CachingConnectionFactory : Created new connection: rabbitConnectionFactory#2a3a299:0/SimpleConnection@66c83fc8. . .
. . .
--- [ main] o.s.i.a.i.AmqpInboundChannelAdapter : started inbound.input.anonymous.CbMIwdkJSBO1ZoPDOtHtCg
. . .
--- [ main] c.e.l.LoggingConsumerApplication : Started LoggingConsumerApplication in 2.531 seconds (JVM running for 2.897)</code></pre>
</div>
</div>
<div class="paragraph">
<p>Go to the RabbitMQ management console or any other RabbitMQ client and send a message to <code>input.anonymous.CbMIwdkJSBO1ZoPDOtHtCg</code>.
The <code>anonymous.CbMIwdkJSBO1ZoPDOtHtCg</code> part represents the group name and is generated, so it is bound to be different in your environment.
For something more predictable, you can use an explicit group name by setting <code>spring.cloud.stream.bindings.input.group=hello</code> (or whatever name you like).</p>
</div>
<div class="paragraph">
<p>The contents of the message should be a JSON representation of the <code>Person</code> class, as follows:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>{"name":"Sam Spade"}</pre>
</div>
</div>
<div class="paragraph">
<p>Then, in your console, you should see:</p>
</div>
<div class="paragraph">
<p><code>Received: Sam Spade</code></p>
</div>
<div class="paragraph">
<p>You can also build and package your application into a boot jar (by using <code>./mvnw clean install</code>) and run the built JAR by using the <code>java -jar</code> command.</p>
</div>
<div class="paragraph">
<p>Now you have a working (albeit very basic) Spring Cloud Stream application.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_whats_new_in_3_0"><a class="link" href="#_whats_new_in_3_0">What&#8217;s New in 3.0?</a></h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="spring-cloud-stream-preface-new-features"><a class="link" href="#spring-cloud-stream-preface-new-features">New Features and Enhancements</a></h3>
<div class="ulist">
<ul>
<li>
<p><strong>Routing Function</strong> - see <a href="#Routing with functions">[Routing with functions]</a> for more details.</p>
</li>
<li>
<p><strong>Multiple bindings with functions</strong> (multiple message handlers) - see <a href="#Multiple functions in a single application">[Multiple functions in a single application]</a> for more details.</p>
</li>
<li>
<p><strong>Functions with multiple inputs/outputs</strong> (single function that can subscribe or target multiple destinations) - see <a href="#Functions with multiple input and output arguments">[Functions with multiple input and output arguments]</a> for more details.</p>
</li>
<li>
<p><strong>Native support for reactive programming</strong> - since v3.0.0 we no longer distribute spring-cloud-stream-reactive modules and instead
relying on native reactive support provided by spring cloud function. For backward
compatibility you can still bring <code>spring-cloud-stream-reactive</code> from previous versions.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="spring-cloud-stream-preface-notable-deprecations"><a class="link" href="#spring-cloud-stream-preface-notable-deprecations">Notable Deprecations</a></h3>
<div class="ulist">
<ul>
<li>
<p><em>Reactive module</em> (<code>spring-cloud-stream-reactive</code>) is discontinued and no longer distributed in favor of native support via spring-cloud-function.
For backward
compatibility you can still bring <code>spring-cloud-stream-reactive</code> from previous versions.</p>
</li>
<li>
<p><em>Test support binder</em> <code>spring-cloud-stream-test-support</code> with MessageCollector in favor of a new test binder. See <a href="#Testing">[Testing]</a> for more details.</p>
</li>
<li>
<p><em>@StreamMessageConverter</em> - deprecated as it is no longer required.</p>
</li>
<li>
<p>The <code>original-content-type</code> header references have been removed after it&#8217;s been deprecated in v2.0.</p>
</li>
<li>
<p>The <code>BinderAwareChannelResolver</code> is deprecated in favor if providing <code>spring.cloud.stream.sendto.destination</code> property.
This is primarily for function-based programming model. For StreamListener it would still be required and thus will stay until we deprecate and eventually discontinue StreamListener
and annotation-based programming model.</p>
</li>
</ul>
</div>
</div>
</div>
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<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_binder_implementations">Binder Implementations</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Spring Cloud Stream is a framework for building highly scalable event-driven microservices connected with shared messaging systems.</p>
</div>
<div class="paragraph">
<p>The framework provides a flexible programming model built on already established and familiar Spring idioms and best practices, including support
for persistent pub/sub semantics, consumer groups, and stateful partitions.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_binder_implementations"><a class="link" href="#_binder_implementations">Binder Implementations</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p>Spring Cloud Stream supports a variety of binder implementations and the following table includes the link to the GitHub projects.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/spring-cloud/spring-cloud-stream-binder-rabbit">RabbitMQ</a></p>
</li>
<li>
<p><a href="https://github.com/spring-cloud/spring-cloud-stream-binder-kafka">Apache Kafka</a></p>
</li>
<li>
<p><a href="https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/tree/master/spring-cloud-stream-binder-kafka-streams">Kafka Streams</a></p>
</li>
<li>
<p><a href="https://github.com/spring-cloud/spring-cloud-stream-binder-aws-kinesis">Amazon Kinesis</a></p>
</li>
<li>
<p><a href="https://github.com/spring-cloud/spring-cloud-gcp/tree/master/spring-cloud-gcp-pubsub-stream-binder">Google PubSub <em>(partner maintained)</em></a></p>
</li>
<li>
<p><a href="https://github.com/SolaceProducts/spring-cloud-stream-binder-solace">Solace PubSub+ <em>(partner maintained)</em></a></p>
</li>
<li>
<p><a href="https://github.com/microsoft/spring-cloud-azure/tree/master/spring-cloud-azure-stream-binder/spring-cloud-azure-eventhubs-stream-binder">Azure Event Hubs <em>(partner maintained)</em></a></p>
</li>
<li>
<p><a href="https://github.com/alibaba/spring-cloud-alibaba/wiki/RocketMQ-en">Apache RocketMQ <em>(partner maintained)</em></a></p>
</li>
</ul>
</div>
<div class="paragraph">
<p>The core building blocks of Spring Cloud Stream are:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>Destination Binders</strong>: Components responsible to provide integration with the external messaging systems.</p>
</li>
<li>
<p><strong>Destination Bindings</strong>: Bridge between the external messaging systems and application provided Producers and Consumers of messages (created by the Destination Binders).</p>
</li>
<li>
<p><strong>Message</strong>: The canonical data structure used by producers and consumers to communicate with Destination Binders (and thus other applications via external messaging systems).</p>
</li>
</ul>
</div>
</div>
</div>
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/*
Orginal Style from ethanschoonover.com/solarized (c) Jeremy Hull <sourdrums@gmail.com>
*/
.hljs {
display: block;
overflow-x: auto;
padding: 0.5em;
background: #fdf6e3;
color: #657b83;
}
.hljs-comment,
.hljs-quote {
color: #93a1a1;
}
/* Solarized Green */
.hljs-keyword,
.hljs-selector-tag,
.hljs-addition {
color: #859900;
}
/* Solarized Cyan */
.hljs-number,
.hljs-string,
.hljs-meta .hljs-meta-string,
.hljs-literal,
.hljs-doctag,
.hljs-regexp {
color: #2aa198;
}
/* Solarized Blue */
.hljs-title,
.hljs-section,
.hljs-name,
.hljs-selector-id,
.hljs-selector-class {
color: #268bd2;
}
/* Solarized Yellow */
.hljs-attribute,
.hljs-attr,
.hljs-variable,
.hljs-template-variable,
.hljs-class .hljs-title,
.hljs-type {
color: #b58900;
}
/* Solarized Orange */
.hljs-symbol,
.hljs-bullet,
.hljs-subst,
.hljs-meta,
.hljs-meta .hljs-keyword,
.hljs-selector-attr,
.hljs-selector-pseudo,
.hljs-link {
color: #cb4b16;
}
/* Solarized Red */
.hljs-built_in,
.hljs-deletion {
color: #dc322f;
}
.hljs-formula {
background: #eee8d5;
}
.hljs-emphasis {
font-style: italic;
}
.hljs-strong {
font-weight: bold;
}

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var toctitle = document.getElementById('toctitle');
var path = window.location.pathname;
if (toctitle != null) {
var oldtoc = toctitle.nextElementSibling;
var newtoc = document.createElement('div');
newtoc.setAttribute('id', 'tocbot');
newtoc.setAttribute('class', 'js-toc desktop-toc');
oldtoc.setAttribute('class', 'mobile-toc');
oldtoc.parentNode.appendChild(newtoc);
tocbot.init({
contentSelector: '#content',
headingSelector: 'h1, h2, h3, h4, h5',
positionFixedSelector: 'body',
fixedSidebarOffset: 90,
smoothScroll: false
});
if (!path.endsWith("index.html") && !path.endsWith("/")) {
var link = document.createElement("a");
if (document.getElementById('index-link')) {
indexLinkElement = document.querySelector('#index-link > p > a');
linkHref = indexLinkElement.getAttribute("href");
link.setAttribute("href", linkHref);
} else {
link.setAttribute("href", "index.html");
}
link.innerHTML = "<span><i class=\"fa fa-chevron-left\" aria-hidden=\"true\"></i></span> Back to index";
var block = document.createElement("div");
block.setAttribute('class', 'back-action');
block.appendChild(link);
var toc = document.getElementById('toc');
var next = document.getElementById('toctitle').nextElementSibling;
toc.insertBefore(block, next);
}
}
var headerHtml = '<div id="header-spring">\n' +
'<h1>\n' +
'<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0" y="0"\n' +
'viewBox="0 0 245.8 45.3" style="enable-background:new 0 0 245.8 45.3;" xml:space="preserve">\n' +
'<g id="logos">\n' +
'<g>\n' +
'<path class="st0" d="M39.4,3.7c-0.6,1.5-1.4,2.8-2.3,4c-3.9-4-9.3-6.4-15.2-6.4c-11.7,0-21.3,9.5-21.3,21.3\n' +
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'<g>\n' +
'<path class="st0" d="M55.2,30.9c-0.5-0.3-0.9-0.9-0.9-1.6c0-1.1,0.8-1.9,1.9-1.9c0.4,0,0.7,0.1,1,0.3c2,1.3,4.1,2,5.9,2\n' +
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'<path class="st0" d="M109.7,14.3c0-1.3,1-2.4,2.3-2.4c1.3,0,2.4,1.1,2.4,2.4V31c0,1.3-1.1,2.3-2.4,2.3c-1.3,0-2.3-1-2.3-2.3V14.3\n' +
'z"/>\n' +
'<path class="st0" d="M116.9,14.3c0-1.3,1-2.4,2.3-2.4c1.3,0,2.4,1.1,2.4,2.4v1c1.3-1.9,3.2-3.4,6.5-3.4c4.7,0,7.4,3.1,7.4,7.9V31\n' +
'c0,1.3-1,2.3-2.3,2.3c-1.3,0-2.4-1-2.4-2.3v-9.7c0-3.2-1.6-5-4.4-5c-2.7,0-4.7,1.9-4.7,5.1V31c0,1.3-1.1,2.3-2.4,2.3\n' +
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'c0,6.8,4.7,10.7,9.6,10.7c3.4,0,5.6-1.7,7-3.6c-0.2,3.7-2.5,5.7-6.5,5.7c-2.4,0-4.5-0.6-6.3-1.6c-0.2-0.1-0.5-0.2-0.9-0.2\n' +
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'<path class="st0" d="M114.5,6.3c0,1.3-1.1,2.4-2.4,2.4c-1.3,0-2.4-1.1-2.4-2.4c0-1.3,1.1-2.4,2.4-2.4\n' +
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'</g>\n' +
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'</g>\n' +
'</svg>\n' +
'\n' +
'</h1>\n' +
'</div>';
var header = document.createElement("div");
header.innerHTML = headerHtml;
document.body.insertBefore(header, document.body.firstChild);

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spring-cloud-stream/3.0.5.RELEASE/reference/htmlsingle/js/tocbot/tocbot.css Normal file
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.toc{overflow-y:auto}.toc>.toc-list{overflow:hidden;position:relative}.toc>.toc-list li{list-style:none}.toc-list{margin:0;padding-left:10px}a.toc-link{color:currentColor;height:100%}.is-collapsible{max-height:1000px;overflow:hidden;transition:all 300ms ease-in-out}.is-collapsed{max-height:0}.is-position-fixed{position:fixed !important;top:0}.is-active-link{font-weight:700}.toc-link::before{background-color:#EEE;content:' ';display:inline-block;height:inherit;left:0;margin-top:-1px;position:absolute;width:2px}.is-active-link::before{background-color:#54BC4B}

1
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