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</head>
<body class="article">
<div id="header">
</div>
<div id="content">
<div class="sect1">
<h2 id="_virgo_recipe_messaging_with_rabbitmq">Virgo recipe "Messaging with RabbitMQ"</h2>
<div class="sectionbody">
<div class="paragraph">
<p><span class="image"><img src="https://eclipse.org/virgo/images/virgo-logo.png" alt="Virgo Homepage"></span></p>
</div>
<div class="sect2">
<h3 id="_acknowledgements">Acknowledgements</h3>
<div class="paragraph">
<p>This guide is inspired by <a href="https://spring.io/guides/gs/messaging-rabbitmq/">"Messaging with RabbitMQ"</a> from the <a href="https://spring.io/">Spring</a> <a href="https://spring.io/guides/">Guides</a>.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_messaging_with_rabbitmq">Messaging with RabbitMQ</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The original guide uses <a href="https://projects.spring.io/spring-boot/">Spring Boot</a> to bootstrap the demo application. This guide shows what needs to be done to run Messaging with RabbitMQ with Virgo.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_shopping_list">Shopping list</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><a href="https://www.eclipse.org/virgo/">Eclipse Virgo from EclipseRT</a></p>
</li>
<li>
<p><a href="https://wiki.eclipse.org/Virgo/Source#Virgo_git_Repositories">Sample Git repository</a></p>
</li>
<li>
<p><a href="https://eclipse.org/downloads/">Eclipse IDE</a></p>
</li>
</ul>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<div class="paragraph">
<p>Only Virgo Server for Apache Tomcat and Virgo Jetty Server are supported by the Virgo Tooling.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ingredients">Ingredients</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><a href="https://spring.io/guides/gs/messaging-rabbitmq/">Original "Messaging with RabbitMQ"</a></p>
</li>
<li>
<p>OSGi Metadata</p>
</li>
<li>
<p>Spring configuration</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_preparations">Preparations</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_get_the_code">Get the code</h3>
<div class="paragraph">
<p>Clone the code from the Git repository: <a href="http://wiki.eclipse.org/Virgo/Source#Virgo_git_Repositories">Sample Git repository</a>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">$ cd ~/MyAwesomeProjectDirectory/
$ git clone git://git.eclipse.org/gitroot/virgo/org.eclipse.virgo.samples.git
$ cd org.eclipse.virgo.samples
$ cd recipe-messaging-rabbitmq</code></pre>
</div>
</div>
<div class="paragraph">
<p>Once inside the source directory of this recipe - your are good to go.</p>
</div>
</div>
<div class="sect2">
<h3 id="_create_the_custom_virgo_runtime">Create the Custom Virgo Runtime</h3>
<div class="paragraph">
<p>Create your own Virgo runtime with <a href="http://gradle.org/">Gradle</a> and <a href="https://github.com/eclipsesource/dockerizor">Dockerizor</a>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">$ ./gradlew :recipe-messaging-rabbitmq-runtime dockerize</code></pre>
</div>
</div>
<div class="paragraph">
<p>The custom Virgo Runtime is packaged as <code>tar</code> archive and available from the runtime build directory.
Extract the runtime into some directory - let&#8217;s say into <code>VIRGO_HOME</code>.</p>
</div>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">
<div class="paragraph">
<p>You&#8217;ll need a <a href="https://www.docker.com/">Docker</a> daemon running in order to create your custom Virgo runtime.
For more information please refer to the <a href="https://github.com/eclipsesource/dockerizor/blob/master/README.md">Dockerizor documentation</a>.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_create_eclipse_project_metadata">Create Eclipse Project Metadata</h3>
<div class="paragraph">
<p>Create the Eclipse IDE metadata with:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">$ ./gradlew eclipse</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_prepare_the_virgo_tooling">Prepare the Virgo Tooling</h3>
<div class="paragraph">
<p>Download <a href="https://eclipse.org/downloads/">Eclipse IDE for Java EE Developers</a> e.g. Eclipse Mars.2 (4.5.2).</p>
</div>
<div class="paragraph">
<p>Start your Eclipse IDE and add the <a href="http://wiki.eclipse.org/Virgo/Tooling">Virgo Tooling</a> to your Eclipse IDE.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<a href="http://download.eclipse.org/virgo/release/tooling/">Virgo Tooling update site</a>: <a href="http://download.eclipse.org/virgo/release/tooling/" class="bare">http://download.eclipse.org/virgo/release/tooling/</a>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Optionally add the <a href="https://wiki.eclipse.org/Linux_Tools_Project/Docker_Tooling">Docker Tooling</a> to your Eclipse IDE.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<a href="http://download.eclipse.org/linuxtools/updates-docker-nightly/">Docker Tooling update site</a>: <a href="http://download.eclipse.org/linuxtools/updates-docker-nightly/" class="bare">http://download.eclipse.org/linuxtools/updates-docker-nightly/</a>
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_import_the_code_into_your_eclipse_ide">Import the code into your Eclipse IDE</h3>
<div class="paragraph">
<p>Now you can <span class="menuseq"><span class="menu">Import</span>&#160;&#9656; <span class="submenu">Gradle</span>&#160;&#9656; <span class="menuitem">Gradle Project</span></span> into your IDE.
The project folder is  called recipe-messaging-rabbitmq and lies directly in the "Sample Applications" folder you created previously with the Git clone command. (<code>org.eclipse.virgo.samples</code>).</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<div class="paragraph">
<p>Before you can drag&#8217;n&#8217;drop the project onto your freshly created Virgo Server you might have to execute
<span class="menuseq"><span class="menu">Virgo</span>&#160;&#9656; <span class="menuitem">Run Generation</span></span> of META-INF/MANIFEST.MF (via a right click on the project) within your Eclipse IDE.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_create_new_virgo_server_runtime">Create new Virgo Server Runtime</h3>
<div class="dlist">
<dl>
<dt class="hdlist1">Define a new server</dt>
<dd>
<p>Within the IDE <span class="menuseq"><span class="menu">New</span>&#160;&#9656; <span class="submenu">Server</span>&#160;&#9656; <span class="submenu">EclipseRT</span>&#160;&#9656; <span class="menuitem">Virgo Runtime</span></span> and choose the directory of the previously installed Virgo server <code>VIRGO_HOME</code>.</p>
</dd>
</dl>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_directions">Directions</h2>
<div class="sectionbody">
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<div class="paragraph">
<p>In the original guide the music plays in the run method of the <code>CommandLineRunner</code> of the Spring Boot application.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p><code><strong>@Configuration</strong></code> &#8658; <code><strong>&lt;XML/&gt;</strong></code></p>
</div>
<div class="paragraph">
<p>We are going to transform the <code>@SpringBootApplication</code> into a plain <code>@Component</code> with an <code>init</code>-method.</p>
</div>
<div class="sect2">
<h3 id="_spring_boot_application">Spring Boot Application</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@SpringBootApplication <b class="conum">(1)</b>
public class Application implements CommandLineRunner { <b class="conum">(2)</b>

  @Autowired private CustomerRepository repository; <b class="conum">(3)</b>

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }

  public void run(String... args) throws Exception { <b class="conum">(4)</b>
    // messaging actions...
  }
}</code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<p>Will be replaced with a plain <code>@Component</code>.</p>
</li>
<li>
<p><code>CommandLineRunner</code> will be replaced, too.</p>
</li>
<li>
<p><code>@Autowired</code> is the common denominator.</p>
</li>
<li>
<p>Will be replaced with a <code>@PostConstruct</code> method.</p>
</li>
</ol>
</div>
</div>
<div class="sect2">
<h3 id="_virgoized_application">Virgoized Application</h3>
<div class="paragraph">
<p>After the transformation the component looks something like:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Component
public class Application {

  @Autowired private CustomerRepository repository;

  @PostConstruct
  public void init() throws Exception {
    // messaging actions...
  }
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_message_receiver">Message Receiver</h3>
<div class="paragraph">
<p>The <code>Receiver</code> is unchanged:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">public class Receiver {

	private CountDownLatch latch = new CountDownLatch(1);

	public void receiveMessage(String message) {
		System.out.println("Received &lt;" + message + "&gt;");
		latch.countDown();
	}

	public CountDownLatch getLatch() {
		return latch;
	}

}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_rabbitmq_queue">RabbitMQ Queue</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Bean
Queue queue() {
  return new Queue("spring-boot", false);
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>vs.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;bean id="queue" class="org.springframework.amqp.core.Queue"&gt;
  &lt;constructor-arg name="name" value="spring-boot" /&gt;
  &lt;constructor-arg name="durable" value="false" /&gt;
&lt;/bean&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_rabbitmq_exchange">RabbitMQ Exchange</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Bean
TopicExchange exchange() {
  return new TopicExchange("spring-boot-exchange");
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>vs.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;bean id="exchange" class="org.springframework.amqp.core.TopicExchange"&gt;
  &lt;constructor-arg name="name" value="spring-boot-exchange" /&gt;
&lt;/bean&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_binding">Binding</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Bean
Binding binding(Queue queue, TopicExchange exchange) {
  return BindingBuilder.bind(queue).to(exchange).with(queueName);
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>vs.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;bean id="binding" class="org.springframework.amqp.core.Binding"&gt;
  &lt;constructor-arg name="destination" value="spring-boot" /&gt;
  &lt;constructor-arg name="destinationType" ref="destination-type-queue" /&gt;
  &lt;constructor-arg name="exchange" value="spring-boot-exchange" /&gt;
  &lt;constructor-arg name="routingKey" value="" /&gt;
  &lt;constructor-arg name="arguments" ref="emptyMap" /&gt;
&lt;/bean&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_connection_factory_and_rabbit_template">Connection Factory and Rabbit Template</h3>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<div class="title">Tip</div>
</td>
<td class="content">
<div class="paragraph">
<p>Spring Boot automatically creates a <code><strong>ConnectionFactory</strong></code> and <code><strong>RabbitTemplate</strong></code>.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;bean id="cachingConnectionFactory" class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory"&gt;
  &lt;property name="host" value="localhost" /&gt;
  &lt;property name="port" value="5672" /&gt;
&lt;/bean&gt;
&lt;bean id="connectionFactory" class="org.springframework.amqp.rabbit.connection.SimpleRoutingConnectionFactory"&gt;
  &lt;property name="defaultTargetConnectionFactory" ref="cachingConnectionFactory" /&gt;
&lt;/bean&gt;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;bean class="org.springframework.amqp.rabbit.core.RabbitTemplate"&gt;
  &lt;constructor-arg ref="connectionFactory" /&gt;
&lt;/bean&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_message_listener">Message Listener</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Bean
SimpleMessageListenerContainer container(ConnectionFactory connectionFactory, MessageListenerAdapter listenerAdapter) {
  SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
  container.setConnectionFactory(connectionFactory);
  container.setQueueNames(queueName);
  container.setMessageListener(listenerAdapter);
  return container;
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>vs.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;bean class="org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer"&gt;
	&lt;property name="connectionFactory" ref="connectionFactory" /&gt;
	&lt;property name="queueNames" value="spring-boot" /&gt;
	&lt;property name="messageListener" ref="messageListener" /&gt;
&lt;/bean&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_osgi_metadata">OSGi Metadata</h3>
<div class="paragraph">
<p>The OSGi metadata is generated from a template:</p>
</div>
<div class="listingblock">
<div class="title">template.mf</div>
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">Bundle-Version: 0.1
Bundle-Name: Virgo Recipe Messaging with RabbitMQ
Bundle-SymbolicName: org.eclipse.virgo.samples.recipie.messaging.rabbitmq
Import-Bundle:
 org.springframework.beans,
 org.springframework.context</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_let_s_taste">Let&#8217;s taste</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="title">log.log</div>
<div class="content">
<pre class="highlight"><code class="language-txt" data-lang="txt">System.out                           Waiting five seconds...
System.out                           Sending message...
...
o.s.a.r.c.CachingConnectionFactory   Created new connection: SimpleConnection@63fa2ace [delegate=amqp://guest@192.168.64.3:5672/]
...
System.out                           Received &lt;Hello from RabbitMQ!&gt;</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_dockerise_the_application">Dockerise the Application</h2>
<div class="sectionbody">
<div class="paragraph">
<p>We use Gradle and Dockerizor to build the application.
Instead of running the sample within the Eclipse IDE you can build a <a href="https://www.docker.com/">Docker</a> image:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">$ ./gradlew dockerize</code></pre>
</div>
</div>
<div class="paragraph">
<p>and run the application with:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">$ docker run</code></pre>
</div>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2016-05-30 11:27:45 +02:00
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