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PivotalLabsAndSamples/student-lab-instructions/10-spring-boot-messaging.html

10-spring-boot-messaging.html 85KB
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  572. </head>

  573. <body class="article toc2 toc-left">

  574. <div id="header">

  575. <h1><a id="spring-boot-messaging"></a>Spring Boot AMQP</h1>

  576. <div id="toc" class="toc2">

  577. <div id="toctitle">Labs</div>

  578. <ul class="sectlevel1">

  579. <li><a href="#_part_1_code_snippet_manager_amqp">Part 1: Code Snippet Manager AMQP</a></li>

  580. <li><a href="#_part_2_snippet_amqp_client">Part 2: Snippet AMQP Client</a></li>

  581. <li><a href="#_challenges">Challenges</a></li>

  582. </ul>

  583. </div>

  584. </div>

  585. <div id="content">

  586. <div id="preamble">

  587. <div class="sectionbody">

  588. <div class="paragraph">

  589. <p>Get familiar with the <strong>RabbitMQ</strong> and <strong>Spring Boot AMQP</strong> and its features.</p>

  590. </div>

  591. <div class="paragraph">

  592. <p><strong>Time:</strong> 20 minutes.</p>

  593. </div>

  594. <!-- toc disabled -->

  595. </div>

  596. </div>

  597. <div class="sect1">

  598. <h2 id="_part_1_code_snippet_manager_amqp">Part 1: Code Snippet Manager AMQP</h2>

  599. <div class="sectionbody">

  600. <div class="paragraph">

  601. <p>You will continue with the <strong>Code Snippet Manager</strong> code. For this lab you will need the <strong>snippet-code-manager-actuator</strong> project code.</p>

  602. </div>

  603. <div class="paragraph">

  604. <p>There are new requirements for the <strong>Code Snippet Manager</strong>:</p>

  605. </div>

  606. <div class="ulist">

  607. <ul>

  608. <li>

  609. <p>Receive code snippets using RabbitMQ:</p>

  610. <div class="ulist">

  611. <ul>

  612. <li>

  613. <p>The communication should be as RPC (emulate synchronous communication) from/to a client.</p>

  614. </li>

  615. <li>

  616. <p>Accept messages for <strong>save</strong>, <strong>update</strong> and <strong>delete</strong> code snippets.</p>

  617. </li>

  618. <li>

  619. <p>Create Listeners for two queues: <strong>snippet.upsert</strong> and <strong>snippet.remove</strong>.</p>

  620. </li>

  621. <li>

  622. <p>For every message that process, send a <strong>Snippet Notification</strong> to the <strong>snippet.notifications</strong> queue.</p>

  623. </li>

  624. </ul>

  625. </div>

  626. </li>

  627. <li>

  628. <p>Should you be able to create the next topology:</p>

  629. <div class="paragraph">

  630. <div class="title">RabbitMQ Topology</div>

  631. <p><span class="image"><img src="images/10-spring-boot-messaging-00.png" alt="Topology" title="RabbitMQ Topology"></span></p>

  632. </div>

  633. </li>

  634. </ul>

  635. </div>

  636. <div class="olist blank">

  637. <ol class="blank">

  638. <li>

  639. <p>Open a browser and hit the url: <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></p>

  640. </li>

  641. <li>

  642. <p>Click the <strong><em>Switch to the full version</em></strong> link.</p>

  643. </li>

  644. <li>

  645. <p>Fill out the <strong>Code Snippet Manager AMQP</strong> Project metadata with (See Figure 1.0):</p>

  646. <table class="tableblock frame-all grid-all spread">

  647. <caption class="title">Table 1. Code Snippet Manager AMQP - metadata</caption>

  648. <colgroup>

  649. <col style="width: 16.6666%;">

  650. <col style="width: 83.3334%;">

  651. </colgroup>

  652. <thead>

  653. <tr>

  654. <th class="tableblock halign-left valign-top">Property</th>

  655. <th class="tableblock halign-left valign-top">Value</th>

  656. </tr>

  657. </thead>

  658. <tbody>

  659. <tr>

  660. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Group</strong>:</p></td>

  661. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop</em></p></td>

  662. </tr>

  663. <tr>

  664. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Artifact</strong>:</p></td>

  665. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-amqp</em></p></td>

  666. </tr>

  667. <tr>

  668. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Name</strong>:</p></td>

  669. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-amqp</em></p></td>

  670. </tr>

  671. <tr>

  672. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Package Name</strong>:</p></td>

  673. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop.snippet</em></p></td>

  674. </tr>

  675. <tr>

  676. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Dependencies</strong>:</p></td>

  677. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>Web, DevTools, Groovy Templates, JPA, Rest Repositories, H2, MySQL, Actuator, HATEOAS, AMQP</em></p></td>

  678. </tr>

  679. <tr>

  680. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Spring Boot</strong>:</p></td>

  681. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>2.0.0.M7</em></p></td>

  682. </tr>

  683. </tbody>

  684. </table>

  685. <div class="paragraph">

  686. <div class="title">Figure 1.0: Spring Initializr - <a href="http://start.spring.io/" class="bare" target="_blank">http://start.spring.io/</a></div>

  687. <p><span class="image"><img src="images/10-spring-boot-messaging-01.png" alt="SpringInitializr" title="Spring Initializr"></span></p>

  688. </div>

  689. <div class="admonitionblock tip">

  690. <table>

  691. <tr>

  692. <td class="icon">

  693. <div class="title">Tip</div>

  694. </td>

  695. <td class="content">

  696. You can choose either <strong>Maven</strong> or <strong>Gradle</strong> project types.

  697. </td>

  698. </tr>

  699. </table>

  700. </div>

  701. </li>

  702. <li>

  703. <p>Type <strong>Web</strong>, <strong>DevTools</strong>, <strong>Groovy Templates</strong>, <strong>JPA</strong>, <strong>Rest Repositories</strong>, <strong>H2</strong>, <strong>MySQL</strong>, <strong>Actuator</strong>, <strong>HATEOAS</strong> and <strong>AMQP</strong> in the <strong><em>Dependencies</em></strong> field and press Enter.</p>

  704. </li>

  705. <li>

  706. <p>Click the <strong><em>Generate Project</em></strong> button.</p>

  707. </li>

  708. <li>

  709. <p>Unzip the file in any directory you want.</p>

  710. </li>

  711. <li>

  712. <p>Import your project in any IDE you want.</p>

  713. </li>

  714. <li>

  715. <p>Copy all the packages (with code) into the new project.</p>

  716. </li>

  717. <li>

  718. <p>The packages: <strong>domain</strong>, <strong>actuator</strong>, <strong>controller</strong>, <strong>repository</strong> and <strong>config</strong> will remain with no change.</p>

  719. </li>

  720. <li>

  721. <p>Next, start by adding the <em>Listeners</em> that will be using the <strong>queues</strong>, create the <strong>SnippetAmqpListener</strong> class in the <strong>io.pivotal.workshop.snippet.amqp</strong> package:</p>

  722. <div class="listingblock">

  723. <div class="title">io.pivotal.workshop.snippet.amqp.SnippetAmqpListener.java</div>

  724. <div class="content">

  725. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.amqp</span>;

  726. 

  727. <span class="keyword">import</span> <span class="include">java.util.Date</span>;

  728. 

  729. <span class="keyword">import</span> <span class="include">org.springframework.amqp.rabbit.annotation.RabbitListener</span>;

  730. <span class="keyword">import</span> <span class="include">org.springframework.messaging.handler.annotation.SendTo</span>;

  731. <span class="keyword">import</span> <span class="include">org.springframework.stereotype.Component</span>;

  732. 

  733. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.domain.Snippet</span>;

  734. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.domain.SnippetNotification</span>;

  735. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.repository.SnippetRepository</span>;

  736. 

  737. <span class="annotation">@Component</span>

  738. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetAmqpListener</span> {

  739. 

  740.         <span class="directive">private</span> SnippetRepository repo;

  741.         <span class="directive">public</span> SnippetAmqpListener(SnippetRepository repo){

  742.                 <span class="local-variable">this</span>.repo = repo;

  743.         }

  744. 

  745. 

  746.         <span class="annotation">@RabbitListener</span>(queues={<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.upsert</span><span class="delimiter">&quot;</span></span>})

  747.         <span class="annotation">@SendTo</span>

  748.         <span class="directive">public</span> SnippetNotification save(Snippet snippet){

  749.                 Snippet result = <span class="local-variable">this</span>.repo.save(snippet);

  750.                 <span class="keyword">return</span> <span class="keyword">new</span> SnippetNotification(result.getId(),<span class="string"><span class="delimiter">&quot;</span><span class="content">SAVE</span><span class="delimiter">&quot;</span></span>,<span class="keyword">new</span> <span class="predefined-type">Date</span>(),<span class="predefined-constant">null</span>);

  751.         }

  752. 

  753.         <span class="annotation">@RabbitListener</span>(queues={<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.remove</span><span class="delimiter">&quot;</span></span>})

  754.         <span class="annotation">@SendTo</span>

  755.         <span class="directive">public</span> SnippetNotification delete(Snippet snippet){

  756.                 <span class="local-variable">this</span>.repo.deleteById(snippet.getId());

  757.                 <span class="keyword">return</span> <span class="keyword">new</span> SnippetNotification(snippet.getId(),<span class="string"><span class="delimiter">&quot;</span><span class="content">DELETE</span><span class="delimiter">&quot;</span></span>,<span class="keyword">new</span> <span class="predefined-type">Date</span>(),<span class="predefined-constant">null</span>);

  758.         }

  759. 

  760. }</code></pre>

  761. </div>

  762. </div>

  763. <div class="paragraph">

  764. <p>In the code above we are using the <strong>@RabbitListener</strong> and <strong>@SendTo</strong> annotations. There are two methods that handle the messages (receiving a <strong>Snippet</strong>) from the two queues.

  765. Also notice that both methods return a new <strong>SnippetNotification</strong>. Actually the <strong>@SendTo</strong> annotation will be the mechanism to reply that notification to the client.</p>

  766. </div>

  767. </li>

  768. <li>

  769. <p>Create in the <strong>domain</strong> package the <strong>SnippetNotification</strong> and <strong>SnippetError</strong> classes:</p>

  770. <div class="listingblock">

  771. <div class="title">io.pivotal.workshop.snippet.domain.SnippetNotification.java</div>

  772. <div class="content">

  773. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.domain</span>;

  774. 

  775. <span class="keyword">import</span> <span class="include">java.util.Date</span>;

  776. 

  777. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetNotification</span> {

  778. 

  779.         <span class="directive">private</span> <span class="predefined-type">String</span> snippetId;

  780.         <span class="directive">private</span> <span class="predefined-type">String</span> action;

  781.         <span class="directive">private</span> <span class="predefined-type">Date</span> processed;

  782.         <span class="directive">private</span> SnippetError error;

  783. 

  784.         <span class="directive">public</span> SnippetNotification() {

  785.         }

  786. 

  787.         <span class="directive">public</span> SnippetNotification(<span class="predefined-type">String</span> snippetId, <span class="predefined-type">String</span> action, <span class="predefined-type">Date</span> processed, SnippetError error) {

  788.                 <span class="local-variable">super</span>();

  789.                 <span class="local-variable">this</span>.snippetId = snippetId;

  790.                 <span class="local-variable">this</span>.action = action;

  791.                 <span class="local-variable">this</span>.processed = processed;

  792.                 <span class="local-variable">this</span>.error = error;

  793.         }

  794. 

  795.         <span class="directive">public</span> <span class="predefined-type">String</span> getSnippetId() {

  796.                 <span class="keyword">return</span> snippetId;

  797.         }

  798. 

  799.         <span class="directive">public</span> <span class="type">void</span> setSnippetId(<span class="predefined-type">String</span> snippetId) {

  800.                 <span class="local-variable">this</span>.snippetId = snippetId;

  801.         }

  802. 

  803.         <span class="directive">public</span> <span class="predefined-type">String</span> getAction() {

  804.                 <span class="keyword">return</span> action;

  805.         }

  806. 

  807.         <span class="directive">public</span> <span class="type">void</span> setAction(<span class="predefined-type">String</span> action) {

  808.                 <span class="local-variable">this</span>.action = action;

  809.         }

  810. 

  811.         <span class="directive">public</span> <span class="predefined-type">Date</span> getProcessed() {

  812.                 <span class="keyword">return</span> processed;

  813.         }

  814. 

  815.         <span class="directive">public</span> <span class="type">void</span> setProcessed(<span class="predefined-type">Date</span> processed) {

  816.                 <span class="local-variable">this</span>.processed = processed;

  817.         }

  818. 

  819.         <span class="directive">public</span> SnippetError getError() {

  820.                 <span class="keyword">return</span> error;

  821.         }

  822. 

  823.         <span class="directive">public</span> <span class="type">void</span> setError(SnippetError error) {

  824.                 <span class="local-variable">this</span>.error = error;

  825.         }

  826. 

  827. }</code></pre>

  828. </div>

  829. </div>

  830. <div class="listingblock">

  831. <div class="title">io.pivotal.workshop.snippet.domain.SnippetError.java</div>

  832. <div class="content">

  833. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.domain</span>;

  834. 

  835. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetError</span> {

  836. 

  837.         <span class="directive">private</span> <span class="predefined-type">String</span> message;

  838.         <span class="directive">private</span> <span class="predefined-type">String</span> errorCode;

  839. 

  840.         <span class="directive">public</span> SnippetError() {

  841.         }

  842. 

  843.         <span class="directive">public</span> SnippetError(<span class="predefined-type">String</span> message, <span class="predefined-type">String</span> errorCode) {

  844.                 <span class="local-variable">this</span>.message = message;

  845.                 <span class="local-variable">this</span>.errorCode = errorCode;

  846.         }

  847. 

  848.         <span class="directive">public</span> <span class="predefined-type">String</span> getMessage() {

  849.                 <span class="keyword">return</span> message;

  850.         }

  851. 

  852.         <span class="directive">public</span> <span class="type">void</span> setMessage(<span class="predefined-type">String</span> message) {

  853.                 <span class="local-variable">this</span>.message = message;

  854.         }

  855. 

  856.         <span class="directive">public</span> <span class="predefined-type">String</span> getErrorCode() {

  857.                 <span class="keyword">return</span> errorCode;

  858.         }

  859. 

  860.         <span class="directive">public</span> <span class="type">void</span> setErrorCode(<span class="predefined-type">String</span> errorCode) {

  861.                 <span class="local-variable">this</span>.errorCode = errorCode;

  862.         }

  863. }</code></pre>

  864. </div>

  865. </div>

  866. </li>

  867. <li>

  868. <p>Next let&#8217;s create the configuration that will be use to convert the incoming messages into a <strong>Snippet</strong> instances and also let&#8217;s wire up the <strong>topology</strong> we are going to need.

  869. Create the <strong>SnippetAmqpConfig</strong> class in the <strong>io.pivotal.workshop.snippet.config</strong> package:</p>

  870. <div class="listingblock">

  871. <div class="title">io.pivotal.workshop.snippet.config.SnippetAmqpConfig.java</div>

  872. <div class="content">

  873. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.config</span>;

  874. 

  875. <span class="keyword">import</span> <span class="include">org.springframework.amqp.core.AmqpAdmin</span>;

  876. <span class="keyword">import</span> <span class="include">org.springframework.amqp.core.Binding</span>;

  877. <span class="keyword">import</span> <span class="include">org.springframework.amqp.core.Binding.DestinationType</span>;

  878. <span class="keyword">import</span> <span class="include">org.springframework.amqp.core.DirectExchange</span>;

  879. <span class="keyword">import</span> <span class="include">org.springframework.amqp.core.Queue</span>;

  880. <span class="keyword">import</span> <span class="include">org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory</span>;

  881. <span class="keyword">import</span> <span class="include">org.springframework.amqp.rabbit.connection.ConnectionFactory</span>;

  882. <span class="keyword">import</span> <span class="include">org.springframework.amqp.support.converter.Jackson2JsonMessageConverter</span>;

  883. <span class="keyword">import</span> <span class="include">org.springframework.boot.CommandLineRunner</span>;

  884. <span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Bean</span>;

  885. <span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Configuration</span>;

  886. 

  887. <span class="annotation">@Configuration</span>

  888. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetAmqpConfig</span> {

  889. 

  890.         <span class="directive">private</span> <span class="directive">final</span> <span class="predefined-type">String</span> SNIPPET_EXCHANGE = <span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.manager</span><span class="delimiter">&quot;</span></span>;

  891. 

  892.         <span class="annotation">@Bean</span>

  893.         <span class="directive">public</span> SimpleRabbitListenerContainerFactory rabbitListenerContainerFactory(ConnectionFactory connectionFactory){

  894.                 SimpleRabbitListenerContainerFactory container = <span class="keyword">new</span> SimpleRabbitListenerContainerFactory();

  895.                 container.setConnectionFactory(connectionFactory);

  896.                 container.setMessageConverter(<span class="keyword">new</span> Jackson2JsonMessageConverter());

  897.                 <span class="keyword">return</span> container;

  898.         }

  899. 

  900.         <span class="annotation">@Bean</span>

  901.         <span class="directive">public</span> DirectExchange directExchange(){

  902.                 <span class="keyword">return</span> <span class="keyword">new</span> DirectExchange(SNIPPET_EXCHANGE, <span class="predefined-constant">true</span>, <span class="predefined-constant">false</span>);

  903.         }

  904. 

  905.         <span class="annotation">@Bean</span>

  906.         <span class="directive">public</span> <span class="predefined-type">Queue</span> upsert(){

  907.                 <span class="keyword">return</span> <span class="keyword">new</span> <span class="predefined-type">Queue</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.upsert</span><span class="delimiter">&quot;</span></span>);

  908.         }

  909. 

  910.         <span class="annotation">@Bean</span>

  911.         <span class="directive">public</span> <span class="predefined-type">Queue</span> remove(){

  912.                 <span class="keyword">return</span> <span class="keyword">new</span> <span class="predefined-type">Queue</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.remove</span><span class="delimiter">&quot;</span></span>);

  913.         }

  914. 

  915.         <span class="annotation">@Bean</span>

  916.         <span class="directive">public</span> CommandLineRunner queuesAndBindings(AmqpAdmin admin){

  917.                 <span class="keyword">return</span> args -&gt; {

  918.                     admin.declareBinding(<span class="keyword">new</span> <span class="predefined-type">Binding</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.upsert</span><span class="delimiter">&quot;</span></span>, DestinationType.QUEUE, SNIPPET_EXCHANGE, <span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.save</span><span class="delimiter">&quot;</span></span>, <span class="predefined-constant">null</span>));

  919.                         admin.declareBinding(<span class="keyword">new</span> <span class="predefined-type">Binding</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.remove</span><span class="delimiter">&quot;</span></span>, DestinationType.QUEUE, SNIPPET_EXCHANGE, <span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.delete</span><span class="delimiter">&quot;</span></span>, <span class="predefined-constant">null</span>));

  920.                         admin.declareBinding(<span class="keyword">new</span> <span class="predefined-type">Binding</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.upsert</span><span class="delimiter">&quot;</span></span>, DestinationType.QUEUE, SNIPPET_EXCHANGE, <span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.update</span><span class="delimiter">&quot;</span></span>, <span class="predefined-constant">null</span>));

  921.                 };

  922.         }

  923. }</code></pre>

  924. </div>

  925. </div>

  926. <div class="paragraph">

  927. <p>In the above code we need to create a <strong>SimpleRabbitListenerContainerFactory</strong> so it can any <strong>JSON</strong> format into our <strong>Snippet</strong> class. In other words, the queues will receive a snippet as <strong>JSON</strong> object.

  928. Also we are creating the <strong>Exchange</strong> and the <strong>Queues</strong>, and after the application is about to start we <strong>Bind</strong> the exchange with all the queues by specifying the <strong>Routing Keys</strong>.</p>

  929. </div>

  930. </li>

  931. <li>

  932. <p>Now you can run the code and take a look at the <strong>RabbitMQ Web Console</strong> by going to <a href="http://localhost:15672" class="bare" target="_blank">http://localhost:15672</a> and see the exchange and queues created and the consumers listening to the queues.</p>

  933. </li>

  934. </ol>

  935. </div>

  936. <div class="admonitionblock tip">

  937. <table>

  938. <tr>

  939. <td class="icon">

  940. <div class="title">Tip</div>

  941. </td>

  942. <td class="content">

  943. The username/password for the RabbitMQ console is: <strong>guest</strong>/<strong>guest</strong>.

  944. </td>

  945. </tr>

  946. </table>

  947. </div>

  948. </div>

  949. </div>

  950. <div class="sect1">

  951. <h2 id="_part_2_snippet_amqp_client">Part 2: Snippet AMQP Client</h2>

  952. <div class="sectionbody">

  953. <div class="paragraph">

  954. <p>The idea of this application is be able to send snippets to be saved or delete, and receive a notification.</p>

  955. </div>

  956. <div class="olist arabic">

  957. <ol class="arabic">

  958. <li>

  959. <p>Open a browser and hit the url: <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></p>

  960. </li>

  961. <li>

  962. <p>Click the <strong><em>Switch to the full version</em></strong> link.</p>

  963. </li>

  964. <li>

  965. <p>Fill out the <strong>Snippet AMQP Client</strong> Project metadata with (See Figure 2.0):</p>

  966. <table class="tableblock frame-all grid-all spread">

  967. <caption class="title">Table 2. Snippet AMQP Client - metadata</caption>

  968. <colgroup>

  969. <col style="width: 16.6666%;">

  970. <col style="width: 83.3334%;">

  971. </colgroup>

  972. <thead>

  973. <tr>

  974. <th class="tableblock halign-left valign-top">Property</th>

  975. <th class="tableblock halign-left valign-top">Value</th>

  976. </tr>

  977. </thead>

  978. <tbody>

  979. <tr>

  980. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Group</strong>:</p></td>

  981. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop</em></p></td>

  982. </tr>

  983. <tr>

  984. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Artifact</strong>:</p></td>

  985. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>snippet-amqp-client</em></p></td>

  986. </tr>

  987. <tr>

  988. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Name</strong>:</p></td>

  989. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>snippet-amqp-client</em></p></td>

  990. </tr>

  991. <tr>

  992. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Package Name</strong>:</p></td>

  993. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop.snippet.client</em></p></td>

  994. </tr>

  995. <tr>

  996. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Dependencies</strong>:</p></td>

  997. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>DevTools, AMQP</em></p></td>

  998. </tr>

  999. </tbody>

  1000. </table>

  1001. <div class="paragraph">

  1002. <div class="title">Figure 2.0: Spring Initializr - <a href="http://start.spring.io/" class="bare" target="_blank">http://start.spring.io/</a></div>

  1003. <p><span class="image"><img src="images/10-spring-boot-messaging-02.png" alt="SpringInitializr" title="Spring Initializr"></span></p>

  1004. </div>

  1005. <div class="admonitionblock tip">

  1006. <table>

  1007. <tr>

  1008. <td class="icon">

  1009. <div class="title">Tip</div>

  1010. </td>

  1011. <td class="content">

  1012. You can choose either <strong>Maven</strong> or <strong>Gradle</strong> project types.

  1013. </td>

  1014. </tr>

  1015. </table>

  1016. </div>

  1017. </li>

  1018. <li>

  1019. <p>Type <strong>Web</strong>, <strong>DevTools</strong>, <strong>Groovy Templates</strong>, <strong>JPA</strong>, <strong>Rest Repositories</strong>, <strong>H2</strong>, <strong>MySQL</strong>, <strong>Actuator</strong>, <strong>HATEOAS</strong> and <strong>AMQP</strong> in the <strong><em>Dependencies</em></strong> field and press Enter.</p>

  1020. </li>

  1021. <li>

  1022. <p>Click the <strong><em>Generate Project</em></strong> button.</p>

  1023. </li>

  1024. <li>

  1025. <p>Unzip the file in any directory you want.</p>

  1026. </li>

  1027. <li>

  1028. <p>Import your project in any IDE you want.</p>

  1029. </li>

  1030. <li>

  1031. <p>Lets start by creating the domains will use, create the following classes in the <strong>io.pivotal.workshop.snippet.client.domain</strong> package:</p>

  1032. <div class="listingblock">

  1033. <div class="title">io.pivotal.workshop.snippet.client.domain.Code.java</div>

  1034. <div class="content">

  1035. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.client.domain</span>;

  1036. 

  1037. <span class="directive">public</span> <span class="type">class</span> <span class="class">Code</span> {

  1038. 

  1039.         <span class="directive">private</span> <span class="predefined-type">String</span> source;

  1040. 

  1041.         <span class="directive">public</span> Code() {

  1042.         }

  1043. 

  1044.         <span class="directive">public</span> Code(<span class="predefined-type">String</span> source) {

  1045.                 <span class="local-variable">this</span>.source = source;

  1046.         }

  1047. 

  1048.         <span class="directive">public</span> <span class="predefined-type">String</span> getSource() {

  1049.                 <span class="keyword">return</span> source;

  1050.         }

  1051. 

  1052.         <span class="directive">public</span> <span class="type">void</span> setSource(<span class="predefined-type">String</span> source) {

  1053.                 <span class="local-variable">this</span>.source = source;

  1054.         }

  1055. 

  1056. }</code></pre>

  1057. </div>

  1058. </div>

  1059. <div class="listingblock">

  1060. <div class="title">io.pivotal.workshop.snippet.client.domain.Language.java</div>

  1061. <div class="content">

  1062. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.client.domain</span>;

  1063. 

  1064. <span class="directive">public</span> <span class="type">class</span> <span class="class">Language</span> {

  1065. 

  1066.         <span class="directive">private</span> <span class="predefined-type">String</span> name;

  1067.         <span class="directive">private</span> <span class="predefined-type">String</span> syntax = <span class="string"><span class="delimiter">&quot;</span><span class="content">text</span><span class="delimiter">&quot;</span></span>;

  1068. 

  1069.         <span class="directive">public</span> Language() {

  1070.         }

  1071. 

  1072.         <span class="directive">public</span> Language(<span class="predefined-type">String</span> name) {

  1073.                 <span class="local-variable">this</span>();

  1074.                 <span class="local-variable">this</span>.name = name;

  1075.         }

  1076. 

  1077.         <span class="directive">public</span> Language(<span class="predefined-type">String</span> name, <span class="predefined-type">String</span> syntax) {

  1078.                 <span class="local-variable">this</span>(name);

  1079.                 <span class="local-variable">this</span>.syntax = syntax;

  1080.         }

  1081. 

  1082.         <span class="directive">public</span> <span class="predefined-type">String</span> getName() {

  1083.                 <span class="keyword">return</span> name;

  1084.         }

  1085. 

  1086.         <span class="directive">public</span> <span class="type">void</span> setName(<span class="predefined-type">String</span> name) {

  1087.                 <span class="local-variable">this</span>.name = name;

  1088.         }

  1089. 

  1090.         <span class="directive">public</span> <span class="predefined-type">String</span> getSyntax() {

  1091.                 <span class="keyword">return</span> syntax;

  1092.         }

  1093. 

  1094.         <span class="directive">public</span> <span class="type">void</span> setSyntax(<span class="predefined-type">String</span> syntax) {

  1095.                 <span class="local-variable">this</span>.syntax = syntax;

  1096.         }

  1097. }</code></pre>

  1098. </div>

  1099. </div>

  1100. <div class="listingblock">

  1101. <div class="title">io.pivotal.workshop.snippet.client.domain.Snippet.java</div>

  1102. <div class="content">

  1103. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.client.domain</span>;

  1104. 

  1105. <span class="directive">public</span> <span class="type">class</span> <span class="class">Snippet</span> {

  1106. 

  1107.         <span class="directive">private</span> <span class="predefined-type">String</span> title;

  1108.         <span class="directive">private</span> <span class="predefined-type">String</span> keywords = <span class="string"><span class="delimiter">&quot;</span><span class="delimiter">&quot;</span></span>;

  1109.         <span class="directive">private</span> Language lang;

  1110.         <span class="directive">private</span> Code code;

  1111. 

  1112.         <span class="directive">public</span> Snippet() {

  1113.         }

  1114. 

  1115.         <span class="directive">public</span> Snippet(<span class="predefined-type">String</span> title, <span class="predefined-type">String</span> keywords, <span class="predefined-type">String</span> description, Language lang, Code code) {

  1116.                 <span class="local-variable">this</span>.title = title;

  1117.                 <span class="local-variable">this</span>.keywords = keywords;

  1118.                 <span class="local-variable">this</span>.lang = lang;

  1119.                 <span class="local-variable">this</span>.code = code;

  1120.         }

  1121. 

  1122.         <span class="directive">public</span> Snippet(<span class="predefined-type">String</span> title, Language lang, Code code) {

  1123.                 <span class="local-variable">this</span>(title, <span class="string"><span class="delimiter">&quot;</span><span class="delimiter">&quot;</span></span>, <span class="string"><span class="delimiter">&quot;</span><span class="delimiter">&quot;</span></span>, lang, code);

  1124.         }

  1125. 

  1126.         <span class="directive">public</span> <span class="predefined-type">String</span> getTitle() {

  1127.                 <span class="keyword">return</span> title;

  1128.         }

  1129. 

  1130.         <span class="directive">public</span> <span class="type">void</span> setTitle(<span class="predefined-type">String</span> title) {

  1131.                 <span class="local-variable">this</span>.title = title;

  1132.         }

  1133. 

  1134.         <span class="directive">public</span> Language getLang() {

  1135.                 <span class="keyword">return</span> lang;

  1136.         }

  1137. 

  1138.         <span class="directive">public</span> <span class="type">void</span> setLang(Language lang) {

  1139.                 <span class="local-variable">this</span>.lang = lang;

  1140.         }

  1141. 

  1142.         <span class="directive">public</span> <span class="predefined-type">String</span> getKeywords() {

  1143.                 <span class="keyword">return</span> keywords;

  1144.         }

  1145. 

  1146.         <span class="directive">public</span> <span class="type">void</span> setKeywords(<span class="predefined-type">String</span> keywords) {

  1147.                 <span class="local-variable">this</span>.keywords = keywords;

  1148.         }

  1149. 

  1150.         <span class="directive">public</span> Code getCode() {

  1151.                 <span class="keyword">return</span> code;

  1152.         }

  1153. 

  1154.         <span class="directive">public</span> <span class="type">void</span> setCode(Code code) {

  1155.                 <span class="local-variable">this</span>.code = code;

  1156.         }

  1157. }</code></pre>

  1158. </div>

  1159. </div>

  1160. <div class="listingblock">

  1161. <div class="title">io.pivotal.workshop.snippet.client.domain.SnippetError.java</div>

  1162. <div class="content">

  1163. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.client.domain</span>;

  1164. 

  1165. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetError</span> {

  1166. 

  1167.         <span class="directive">private</span> <span class="predefined-type">String</span> message;

  1168.         <span class="directive">private</span> <span class="predefined-type">String</span> errorCode;

  1169. 

  1170.         <span class="directive">public</span> SnippetError() {

  1171.         }

  1172. 

  1173.         <span class="directive">public</span> SnippetError(<span class="predefined-type">String</span> message, <span class="predefined-type">String</span> errorCode) {

  1174.                 <span class="local-variable">this</span>.message = message;

  1175.                 <span class="local-variable">this</span>.errorCode = errorCode;

  1176.         }

  1177. 

  1178.         <span class="directive">public</span> <span class="predefined-type">String</span> getMessage() {

  1179.                 <span class="keyword">return</span> message;

  1180.         }

  1181. 

  1182.         <span class="directive">public</span> <span class="type">void</span> setMessage(<span class="predefined-type">String</span> message) {

  1183.                 <span class="local-variable">this</span>.message = message;

  1184.         }

  1185. 

  1186.         <span class="directive">public</span> <span class="predefined-type">String</span> getErrorCode() {

  1187.                 <span class="keyword">return</span> errorCode;

  1188.         }

  1189. 

  1190.         <span class="directive">public</span> <span class="type">void</span> setErrorCode(<span class="predefined-type">String</span> errorCode) {

  1191.                 <span class="local-variable">this</span>.errorCode = errorCode;

  1192.         }

  1193. }</code></pre>

  1194. </div>

  1195. </div>

  1196. <div class="listingblock">

  1197. <div class="title">io.pivotal.workshop.snippet.client.domain.SnippetNotification.java</div>

  1198. <div class="content">

  1199. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.client.domain</span>;

  1200. 

  1201. <span class="keyword">import</span> <span class="include">java.util.Date</span>;

  1202. 

  1203. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetNotification</span> {

  1204. 

  1205.         <span class="directive">private</span> <span class="predefined-type">String</span> snipetId;

  1206.         <span class="directive">private</span> <span class="predefined-type">String</span> action;

  1207.         <span class="directive">private</span> <span class="predefined-type">Date</span> processed;

  1208.         <span class="directive">private</span> SnippetError error;

  1209. 

  1210.         <span class="directive">public</span> SnippetNotification() {

  1211.         }

  1212. 

  1213.         <span class="directive">public</span> SnippetNotification(<span class="predefined-type">String</span> snipetId, <span class="predefined-type">String</span> action, <span class="predefined-type">Date</span> processed, SnippetError error) {

  1214.                 <span class="local-variable">super</span>();

  1215.                 <span class="local-variable">this</span>.snipetId = snipetId;

  1216.                 <span class="local-variable">this</span>.action = action;

  1217.                 <span class="local-variable">this</span>.processed = processed;

  1218.                 <span class="local-variable">this</span>.error = error;

  1219.         }

  1220. 

  1221.         <span class="directive">public</span> <span class="predefined-type">String</span> getSnipetId() {

  1222.                 <span class="keyword">return</span> snipetId;

  1223.         }

  1224. 

  1225.         <span class="directive">public</span> <span class="type">void</span> setSnipetId(<span class="predefined-type">String</span> snipetId) {

  1226.                 <span class="local-variable">this</span>.snipetId = snipetId;

  1227.         }

  1228. 

  1229.         <span class="directive">public</span> <span class="predefined-type">String</span> getAction() {

  1230.                 <span class="keyword">return</span> action;

  1231.         }

  1232. 

  1233.         <span class="directive">public</span> <span class="type">void</span> setAction(<span class="predefined-type">String</span> action) {

  1234.                 <span class="local-variable">this</span>.action = action;

  1235.         }

  1236. 

  1237.         <span class="directive">public</span> <span class="predefined-type">Date</span> getProcessed() {

  1238.                 <span class="keyword">return</span> processed;

  1239.         }

  1240. 

  1241.         <span class="directive">public</span> <span class="type">void</span> setProcessed(<span class="predefined-type">Date</span> processed) {

  1242.                 <span class="local-variable">this</span>.processed = processed;

  1243.         }

  1244. 

  1245.         <span class="directive">public</span> SnippetError getError() {

  1246.                 <span class="keyword">return</span> error;

  1247.         }

  1248. 

  1249.         <span class="directive">public</span> <span class="type">void</span> setError(SnippetError error) {

  1250.                 <span class="local-variable">this</span>.error = error;

  1251.         }

  1252. 

  1253.         <span class="annotation">@Override</span>

  1254.         <span class="directive">public</span> <span class="predefined-type">String</span> toString() {

  1255.                 <span class="keyword">return</span> <span class="string"><span class="delimiter">&quot;</span><span class="content">SnippetNotification [snipetId=</span><span class="delimiter">&quot;</span></span> + snipetId + <span class="string"><span class="delimiter">&quot;</span><span class="content">, action=</span><span class="delimiter">&quot;</span></span> + action + <span class="string"><span class="delimiter">&quot;</span><span class="content">, processed=</span><span class="delimiter">&quot;</span></span> + processed

  1256.                                 + <span class="string"><span class="delimiter">&quot;</span><span class="content">, error=</span><span class="delimiter">&quot;</span></span> + error + <span class="string"><span class="delimiter">&quot;</span><span class="content">]</span><span class="delimiter">&quot;</span></span>;

  1257.         }

  1258. 

  1259. }</code></pre>

  1260. </div>

  1261. </div>

  1262. </li>

  1263. <li>

  1264. <p>Next, lets create a producer that will send the messages to the exchange, create the <strong>SnippetProducer</strong> class in the <strong>io.pivotal.workshop.snippet.client.amqp</strong> package:</p>

  1265. <div class="listingblock">

  1266. <div class="title">io.pivotal.workshop.snippet.client.amqp.SnippetProducer.java</div>

  1267. <div class="content">

  1268. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.client.amqp</span>;

  1269. 

  1270. <span class="keyword">import</span> <span class="include">org.springframework.amqp.rabbit.core.RabbitTemplate</span>;

  1271. <span class="keyword">import</span> <span class="include">org.springframework.stereotype.Component</span>;

  1272. 

  1273. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.client.domain.Snippet</span>;

  1274. 

  1275. <span class="annotation">@Component</span>

  1276. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetProducer</span> {

  1277. 

  1278.         <span class="directive">public</span> <span class="type">enum</span> SnippetAction {

  1279.                 SAVE(<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.save</span><span class="delimiter">&quot;</span></span>), DELETE(<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.delete</span><span class="delimiter">&quot;</span></span>), UPDATE(<span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.update</span><span class="delimiter">&quot;</span></span>);

  1280. 

  1281.                 <span class="directive">private</span> <span class="directive">final</span> <span class="predefined-type">String</span> routingKey;

  1282.                 <span class="directive">private</span> SnippetAction(<span class="predefined-type">String</span> routingKey){

  1283.                         <span class="local-variable">this</span>.routingKey = routingKey;

  1284.                 }

  1285. 

  1286.                 <span class="directive">public</span> <span class="predefined-type">String</span> getRoutingKey(){

  1287.                         <span class="keyword">return</span> <span class="local-variable">this</span>.routingKey;

  1288.                 }

  1289.         }

  1290. 

  1291.         <span class="directive">private</span> RabbitTemplate template;

  1292. 

  1293.         <span class="directive">public</span> SnippetProducer(RabbitTemplate template){

  1294.                 <span class="local-variable">this</span>.template = template;

  1295.         }

  1296. 

  1297.         <span class="directive">public</span> <span class="predefined-type">Object</span> send(SnippetAction action,Snippet snippet){

  1298.                 <span class="keyword">return</span> <span class="local-variable">this</span>.template.convertSendAndReceive(action.getRoutingKey(),snippet);

  1299.         }

  1300. 

  1301. }</code></pre>

  1302. </div>

  1303. </div>

  1304. <div class="paragraph">

  1305. <p>Here we are using the <strong>RabbitTemplate</strong> and it&#8217;s method <strong>convertSendAndReceive</strong> (here we are doing the RPC - emulating the <strong>synchronous</strong> communication).</p>

  1306. </div>

  1307. </li>

  1308. <li>

  1309. <p>Because we are doing an <strong>RPC</strong>, we are getting back from the <strong>Code Snippet Manager AMQP</strong> app the <strong>SnippetNotification</strong> (as <strong>JSON</strong>), so we need to configure the <strong>RabbitTemplate</strong> to support this conversion.

  1310. Create the <strong>SnippetClientAmqpConfig</strong> in the <strong>io.pivotal.workshop.snippet.client.config</strong> package:</p>

  1311. <div class="listingblock">

  1312. <div class="title">io.pivotal.workshop.snippet.client.config.SnippetClientAmqpConfig.java</div>

  1313. <div class="content">

  1314. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.client.config</span>;

  1315. 

  1316. <span class="keyword">import</span> <span class="include">org.springframework.amqp.core.MessageProperties</span>;

  1317. <span class="keyword">import</span> <span class="include">org.springframework.amqp.rabbit.connection.ConnectionFactory</span>;

  1318. <span class="keyword">import</span> <span class="include">org.springframework.amqp.rabbit.core.RabbitTemplate</span>;

  1319. <span class="keyword">import</span> <span class="include">org.springframework.amqp.support.converter.DefaultJackson2JavaTypeMapper</span>;

  1320. <span class="keyword">import</span> <span class="include">org.springframework.amqp.support.converter.Jackson2JavaTypeMapper</span>;

  1321. <span class="keyword">import</span> <span class="include">org.springframework.amqp.support.converter.Jackson2JsonMessageConverter</span>;

  1322. <span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Bean</span>;

  1323. <span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Configuration</span>;

  1324. 

  1325. <span class="keyword">import</span> <span class="include">com.fasterxml.jackson.databind.JavaType</span>;

  1326. 

  1327. <span class="annotation">@Configuration</span>

  1328. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetClientAmqpConfig</span> {

  1329. 

  1330.         <span class="directive">private</span> <span class="directive">final</span> <span class="predefined-type">String</span> SNIPPET_EXCHANGE = <span class="string"><span class="delimiter">&quot;</span><span class="content">snippet.manager</span><span class="delimiter">&quot;</span></span>;

  1331. 

  1332.         <span class="annotation">@Bean</span>

  1333.         <span class="directive">public</span> RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory){

  1334.                 Jackson2JsonMessageConverter converter = <span class="keyword">new</span> Jackson2JsonMessageConverter();

  1335.                 Jackson2JavaTypeMapper mapper = <span class="keyword">new</span> DefaultJackson2JavaTypeMapper() {

  1336. 

  1337.                         <span class="annotation">@Override</span>

  1338.                         <span class="directive">public</span> JavaType toJavaType(MessageProperties properties) {

  1339.                                 properties.setHeader(<span class="string"><span class="delimiter">&quot;</span><span class="content">__TypeId__</span><span class="delimiter">&quot;</span></span>, <span class="string"><span class="delimiter">&quot;</span><span class="content">io.pivotal.workshop.snippet.client.domain.SnippetNotification</span><span class="delimiter">&quot;</span></span>);

  1340.                                 <span class="keyword">return</span> <span class="local-variable">super</span>.toJavaType(properties);

  1341.                         }

  1342. 

  1343.                 };

  1344.                 converter.setJavaTypeMapper(mapper);

  1345. 

  1346.                 RabbitTemplate template = <span class="keyword">new</span> RabbitTemplate(connectionFactory);

  1347.                 template.setMessageConverter(converter);

  1348.                 template.setExchange(SNIPPET_EXCHANGE);

  1349.                 <span class="keyword">return</span> template;

  1350.         }

  1351. 

  1352. }</code></pre>

  1353. </div>

  1354. </div>

  1355. <div class="paragraph">

  1356. <p>Its important to notice that we are using the same converter as before, the <strong>Jackson2JsonMessageConverter</strong>, that practically will map the <strong>JSON</strong> object to the <strong>SnippetNotification</strong>.

  1357. Here we are adding a little trick, a special header: <strong><em>TypeId</em></strong> that will be use as reference for the mapping, our own <strong>SnippetNotification</strong>.</p>

  1358. </div>

  1359. <div class="admonitionblock tip">

  1360. <table>

  1361. <tr>

  1362. <td class="icon">

  1363. <div class="title">Tip</div>

  1364. </td>

  1365. <td class="content">

  1366. If you want to know more about this solution, ask the instructor to explain a little further. Also you can take a look at the documentation: <a href="http://docs.spring.io/spring-amqp/reference/html/_reference.html#message-converters" class="bare" target="_blank">http://docs.spring.io/spring-amqp/reference/html/_reference.html#message-converters</a>

  1367. </td>

  1368. </tr>

  1369. </table>

  1370. </div>

  1371. </li>

  1372. <li>

  1373. <p>Now its time to send some <strong>Snippet</strong>. Create the <strong>SnippetClientConfig</strong> class in the <strong>io.pivotal.workshop.snippet.client.config</strong> package:</p>

  1374. <div class="listingblock">

  1375. <div class="title">io.pivotal.workshop.snippet.client.config.SnippetClientConfig.java</div>

  1376. <div class="content">

  1377. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.client.config</span>;

  1378. 

  1379. <span class="keyword">import</span> <span class="include">java.nio.file.Files</span>;

  1380. <span class="keyword">import</span> <span class="include">java.nio.file.Paths</span>;

  1381. 

  1382. <span class="keyword">import</span> <span class="include">org.slf4j.Logger</span>;

  1383. <span class="keyword">import</span> <span class="include">org.slf4j.LoggerFactory</span>;

  1384. <span class="keyword">import</span> <span class="include">org.springframework.boot.CommandLineRunner</span>;

  1385. <span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Bean</span>;

  1386. <span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Configuration</span>;

  1387. 

  1388. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.client.amqp.SnippetProducer</span>;

  1389. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.client.amqp.SnippetProducer.SnippetAction</span>;

  1390. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.client.domain.Code</span>;

  1391. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.client.domain.Language</span>;

  1392. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.client.domain.Snippet</span>;

  1393. 

  1394. <span class="annotation">@Configuration</span>

  1395. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetClientConfig</span> {

  1396. 

  1397.         <span class="directive">private</span> <span class="directive">final</span> <span class="predefined-type">Logger</span> log = LoggerFactory.getLogger(<span class="string"><span class="delimiter">&quot;</span><span class="content">SNIPPET-SENDER</span><span class="delimiter">&quot;</span></span>);

  1398. 

  1399.         <span class="annotation">@Bean</span>

  1400.         <span class="directive">public</span> CommandLineRunner sendSnippets(SnippetProducer producer){

  1401.                 <span class="keyword">return</span> args -&gt; {

  1402.                         <span class="predefined-type">Object</span> obj = producer.send(SnippetAction.SAVE, <span class="keyword">new</span> Snippet(<span class="string"><span class="delimiter">&quot;</span><span class="content">Hello World</span><span class="delimiter">&quot;</span></span>, <span class="keyword">new</span> Language(<span class="string"><span class="delimiter">&quot;</span><span class="content">Kotlin</span><span class="delimiter">&quot;</span></span>, <span class="string"><span class="delimiter">&quot;</span><span class="content">java</span><span class="delimiter">&quot;</span></span>),<span class="keyword">new</span> Code(<span class="keyword">new</span> <span class="predefined-type">String</span>(Files.readAllBytes(Paths.get(<span class="string"><span class="delimiter">&quot;</span><span class="content">code/Hello.kt</span><span class="delimiter">&quot;</span></span>))))));

  1403.                         log.info(obj.toString());

  1404.                 };

  1405.         }

  1406. }</code></pre>

  1407. </div>

  1408. </div>

  1409. <div class="paragraph">

  1410. <p>Here we are using the <strong>Snippet</strong> producer to send the <strong>Snippet</strong> message.</p>

  1411. </div>

  1412. </li>

  1413. <li>

  1414. <p>Now you can run the application, and you should get your response back, a <strong>SnippetNotification</strong> object.</p>

  1415. </li>

  1416. </ol>

  1417. </div>

  1418. </div>

  1419. </div>

  1420. <div class="sect1">

  1421. <h2 id="_challenges">Challenges</h2>

  1422. <div class="sectionbody">

  1423. <div class="paragraph">

  1424. <p>As you already know we havent implemented some of the requirements:</p>

  1425. </div>

  1426. <div class="ulist">

  1427. <ul>

  1428. <li>

  1429. <p>Create the <strong>snippet.notifications</strong> queue and bind it to the <strong>snippet.manager</strong> exchange.</p>

  1430. </li>

  1431. <li>

  1432. <p>The <strong>Code Snippet Manager AMQP</strong> app needs to send a notification every time it receives a <strong>Snippet</strong>:</p>

  1433. <div class="ulist">

  1434. <ul>

  1435. <li>

  1436. <p>Without modifying the <strong>SnippetAmqpListener</strong> add the behavior to send a <strong>SnippetNotification</strong> to the <strong>snippet.notifications</strong> queue.</p>

  1437. <div class="admonitionblock tip">

  1438. <table>

  1439. <tr>

  1440. <td class="icon">

  1441. <div class="title">Tip</div>

  1442. </td>

  1443. <td class="content">

  1444. Use <strong>AOP</strong> for this particular concern and use the <strong>RabbitTemplate</strong> to send a <strong><em>asynchronous</em></strong> notification.

  1445. </td>

  1446. </tr>

  1447. </table>

  1448. </div>

  1449. </li>

  1450. </ul>

  1451. </div>

  1452. </li>

  1453. <li>

  1454. <p>Make the <strong>Snippet AMQP Client</strong> app listen for any notification.</p>

  1455. </li>

  1456. </ul>

  1457. </div>

  1458. </div>

  1459. </div>

  1460. </div>

  1461. <div id="footer">

  1462. <div id="footer-text">

  1463. Last updated 2017-11-18 11:05:53 PST

  1464. </div>

  1465. </div>

  1466. </body>

  1467. </html>