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PivotalLabsAndSamples/student-lab-instructions/12-spring-boot-cloud-stream...

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  536.     td.content {

  537.         font-size:2.0625rem;

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  539. 

  540.     div.title {

  541.         font-size:2.0625rem;

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  544. 

  545. <script src="js/jquery-3.2.1.min.js"></script>

  546. <script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/1.7.1/clipboard.min.js"></script>

  547. <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

  548. <script>

  549. 

  550.     $(function() {

  551.         var button = $("<div style='padding: 10px;'><button data-toggle='tooltip' placement='right' data-trigger='click' title='Copied!'  class='c2cb glyphicon glyphicon-copy'></button></div>");

  552.         $(".listingblock > .content pre").prepend(button);

  553. 

  554.         $('[data-toggle="tooltip"]').tooltip();

  555. 

  556.         $('[data-toggle="tooltip"]').mouseout(function() {

  557.             $(this).tooltip('hide');

  558.             $(this).trigger('blur');

  559.         });

  560. 

  561.         var clipboard = new Clipboard('.c2cb', {

  562.             target: function(c2cb) {

  563.                         return $(c2cb).parent().siblings("code")[0];

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  566.             clipboard.on('success', function(e) {

  567.                 e.clearSelection();

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  569.     });

  570. 

  571. </script>

  572. </head>

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

  574. <div id="header">

  575. <h1><a id="spring-boot-security"></a>Spring Boot - Spring Integration and Spring Cloud Stream</h1>

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

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

  578. <ul class="sectlevel1">

  579. <li><a href="#_requirements">Requirements</a></li>

  580. <li><a href="#_code_snippet_manager_stream_app_source">Code Snippet Manager Stream App - Source</a></li>

  581. <li><a href="#_code_snippet_manager_stream_log_app_sink">Code Snippet Manager Stream Log App - Sink</a></li>

  582. <li><a href="#_testing">Testing</a>

  583. <ul class="sectlevel2">

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

  585. </ul>

  586. </li>

  587. <li><a href="#_homework">HOMEWORK</a></li>

  588. </ul>

  589. </div>

  590. </div>

  591. <div id="content">

  592. <div id="preamble">

  593. <div class="sectionbody">

  594. <div class="paragraph">

  595. <p>Get familiar with <strong>Spring Integration</strong> and <strong>Spring Cloud Stream</strong> using <strong>Spring Boot</strong> and learn how <strong>Microservices</strong> can communicate with each other.

  596. <strong>Time:</strong> 30 minutes.</p>

  597. </div>

  598. </div>

  599. </div>

  600. <div class="sect1">

  601. <h2 id="_requirements">Requirements</h2>

  602. <div class="sectionbody">

  603. <div class="ulist">

  604. <ul>

  605. <li>

  606. <p>You will need <strong>RabbitMQ</strong> up and running.</p>

  607. </li>

  608. </ul>

  609. </div>

  610. <!-- toc disabled -->

  611. </div>

  612. </div>

  613. <div class="sect1">

  614. <h2 id="_code_snippet_manager_stream_app_source">Code Snippet Manager Stream App - Source</h2>

  615. <div class="sectionbody">

  616. <div class="paragraph">

  617. <p>We are going create a <strong>Source</strong> (our <strong><em>Code Snippet Manager</em></strong>). This <strong>Source</strong> will use <strong>Spring Integration</strong> to read snippets from the File System and it will forward the snippet to a <strong>Sink</strong> application.</p>

  618. </div>

  619. <div class="olist arabic">

  620. <ol class="arabic">

  621. <li>

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

  623. </li>

  624. <li>

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

  626. </li>

  627. <li>

  628. <p>Fill out the Code Snippet Manager Stream App Project metadata with (See Figure 1.0):</p>

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

  630. <caption class="title">Table 1. Code Snippet Manager Stream App Source - metadata</caption>

  631. <colgroup>

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

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

  634. </colgroup>

  635. <thead>

  636. <tr>

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

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

  639. </tr>

  640. </thead>

  641. <tbody>

  642. <tr>

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

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

  645. </tr>

  646. <tr>

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

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

  649. </tr>

  650. <tr>

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

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

  653. </tr>

  654. <tr>

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

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

  657. </tr>

  658. <tr>

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

  660. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>Reactive Web</em>, <em>DevTools</em>, <em>MongoDB</em>, <em>Actuator</em>, <em>Stream Rabbit</em>, <em>Embedded MongoDB</em>, <em>Integration</em></p></td>

  661. </tr>

  662. <tr>

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

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

  665. </tr>

  666. </tbody>

  667. </table>

  668. <div class="paragraph">

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

  670. <p><span class="image"><img src="images/12-spring-boot-cloud-stream-01.png" alt="SpringInitializr" title="Spring Initializr"></span></p>

  671. </div>

  672. <div class="admonitionblock tip">

  673. <table>

  674. <tr>

  675. <td class="icon">

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

  677. </td>

  678. <td class="content">

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

  680. </td>

  681. </tr>

  682. </table>

  683. </div>

  684. </li>

  685. <li>

  686. <p>Type <strong>Reactive Web</strong>, <strong>DevTools</strong>, <strong>MongoDB</strong>, <strong>Reactive MongoDB</strong>, <strong>Actuator</strong>, <strong>Stream Rabbit</strong>, <strong>Embedded MongoDB</strong> and <strong>Integration</strong> in the <strong><em>Dependencies</em></strong> field and press Enter.</p>

  687. </li>

  688. <li>

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

  690. </li>

  691. <li>

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

  693. </li>

  694. <li>

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

  696. </li>

  697. <li>

  698. <p>Copy <strong>ONLY</strong> the classes from the previous Lab (<strong><em>WebFlux</em></strong>), we are going to reuse them.</p>

  699. </li>

  700. <li>

  701. <p>Is necessary to do several mofications to the <strong>pom.xml</strong> or <strong>build.gradle</strong> files. First modify the <strong>spirng-cloud-starter-stream-rabbit</strong> dependency to look like this:</p>

  702. <div class="listingblock">

  703. <div class="title">pom.xml</div>

  704. <div class="content">

  705. <pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>

  706.         <span class="tag">&lt;groupId&gt;</span>org.springframework.cloud<span class="tag">&lt;/groupId&gt;</span>

  707.         <span class="tag">&lt;artifactId&gt;</span>spring-cloud-starter-stream-rabbit<span class="tag">&lt;/artifactId&gt;</span>

  708.     <span class="tag">&lt;exclusions&gt;</span>

  709.         <span class="tag">&lt;exclusion&gt;</span>

  710.             <span class="tag">&lt;groupId&gt;</span>org.springframework.boot<span class="tag">&lt;/groupId&gt;</span>

  711.             <span class="tag">&lt;artifactId&gt;</span>spring-boot-starter-tomcat<span class="tag">&lt;/artifactId&gt;</span>

  712.         <span class="tag">&lt;/exclusion&gt;</span>

  713.     <span class="tag">&lt;/exclusions&gt;</span>

  714. <span class="tag">&lt;/dependency&gt;</span></code></pre>

  715. </div>

  716. </div>

  717. <div class="paragraph">

  718. <p>or</p>

  719. </div>

  720. <div class="listingblock">

  721. <div class="title">buildf.gradle</div>

  722. <div class="content">

  723. <pre class="CodeRay highlight"><code data-lang="groovy">compile(<span class="string"><span class="delimiter">'</span><span class="content">org.springframework.cloud:spring-cloud-starter-stream-rabbit</span><span class="delimiter">'</span></span>){

  724.     exclude <span class="key">module</span>: <span class="string"><span class="delimiter">&quot;</span><span class="content">spring-boot-starter-tomcat</span><span class="delimiter">&quot;</span></span>

  725. }</code></pre>

  726. </div>

  727. </div>

  728. <div class="paragraph">

  729. <p>This dependency is part of the <strong>Spring Cloud Stream</strong>; the <strong>Binder</strong> that we are going to use: <strong>RabbitMQ</strong>. This dependency brings <strong>Tomcat</strong>, something that we don&#8217;t need because we are using <strong>Netty</strong> instead for the <strong><em>reactive</em></strong> part.</p>

  730. </div>

  731. </li>

  732. <li>

  733. <p>Next, modify the <strong>pom.xml</strong> or <strong>build.gradle</strong> so the <strong>Embedded MongoDB</strong> is used at <strong>runtime</strong>.</p>

  734. <div class="listingblock">

  735. <div class="title">pom.xml</div>

  736. <div class="content">

  737. <pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>

  738.         <span class="tag">&lt;groupId&gt;</span>de.flapdoodle.embed<span class="tag">&lt;/groupId&gt;</span>

  739.     <span class="tag">&lt;artifactId&gt;</span>de.flapdoodle.embed.mongo<span class="tag">&lt;/artifactId&gt;</span>

  740.     <span class="tag">&lt;scope&gt;</span>runtime<span class="tag">&lt;/scope&gt;</span>

  741. <span class="tag">&lt;/dependency&gt;</span></code></pre>

  742. </div>

  743. </div>

  744. <div class="paragraph">

  745. <p>or</p>

  746. </div>

  747. <div class="listingblock">

  748. <div class="title">build.gradle</div>

  749. <div class="content">

  750. <pre class="CodeRay highlight"><code data-lang="groovy">runtime(<span class="string"><span class="delimiter">'</span><span class="content">de.flapdoodle.embed:de.flapdoodle.embed.mongo</span><span class="delimiter">'</span></span>)</code></pre>

  751. </div>

  752. </div>

  753. </li>

  754. <li>

  755. <p>Because we are going to use <strong>Spring Integration</strong> to read from the <strong>File System</strong> we need to add the following dependencies:</p>

  756. <div class="listingblock">

  757. <div class="title">pom.xml</div>

  758. <div class="content">

  759. <pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>

  760.     <span class="tag">&lt;groupId&gt;</span>org.springframework.integration<span class="tag">&lt;/groupId&gt;</span>

  761.     <span class="tag">&lt;artifactId&gt;</span>spring-integration-file<span class="tag">&lt;/artifactId&gt;</span>

  762. <span class="tag">&lt;/dependency&gt;</span>

  763. <span class="tag">&lt;dependency&gt;</span>

  764.     <span class="tag">&lt;groupId&gt;</span>org.springframework.integration<span class="tag">&lt;/groupId&gt;</span>

  765.     <span class="tag">&lt;artifactId&gt;</span>spring-integration-java-dsl<span class="tag">&lt;/artifactId&gt;</span>

  766. <span class="tag">&lt;/dependency&gt;</span>

  767. <span class="tag">&lt;dependency&gt;</span>

  768.     <span class="tag">&lt;groupId&gt;</span>org.yaml<span class="tag">&lt;/groupId&gt;</span>

  769.     <span class="tag">&lt;artifactId&gt;</span>snakeyaml<span class="tag">&lt;/artifactId&gt;</span>

  770. <span class="tag">&lt;/dependency&gt;</span></code></pre>

  771. </div>

  772. </div>

  773. <div class="paragraph">

  774. <p>or</p>

  775. </div>

  776. <div class="listingblock">

  777. <div class="title">build.gradle</div>

  778. <div class="content">

  779. <pre class="CodeRay highlight"><code data-lang="groovy">compile(<span class="string"><span class="delimiter">'</span><span class="content">org.springframework.integration:spring-integration-file</span><span class="delimiter">'</span></span>)

  780. compile(<span class="string"><span class="delimiter">'</span><span class="content">org.springframework.integration:spring-integration-java-dsl</span><span class="delimiter">'</span></span>)

  781. compile(<span class="string"><span class="delimiter">'</span><span class="content">org.yaml:snakeyaml</span><span class="delimiter">'</span></span>)</code></pre>

  782. </div>

  783. </div>

  784. </li>

  785. <li>

  786. <p>This application will have its own MongoDB (embedded) running in a random port, so it&#8217;s necessary to configure the client so it can connect. Create a <strong>io.pivotal.workshop.snippet.config.SnippetConfiguration</strong> class.</p>

  787. <div class="listingblock">

  788. <div class="title">src/main/java/io/pivotal/workshop/snippet/config/SnippetConfig.java</div>

  789. <div class="content">

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

  791. 

  792. <span class="keyword">import</span> <span class="include">com.mongodb.MongoClient</span>;

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

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

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

  796. <span class="keyword">import</span> <span class="include">org.springframework.core.env.Environment</span>;

  797. 

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

  799. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetConfiguration</span> {

  800. 

  801. 

  802.     <span class="directive">private</span> Environment environment;

  803. 

  804.     <span class="directive">public</span> SnippetConfiguration(Environment environment) {

  805.         <span class="local-variable">this</span>.environment = environment;

  806.     }

  807. 

  808. 

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

  810.     <span class="annotation">@DependsOn</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">embeddedMongoServer</span><span class="delimiter">&quot;</span></span>)           <span class="comment">//</span><b class="conum">(1)</b>

  811.     <span class="directive">public</span> MongoClient reactiveMongoClient() {

  812.         <span class="type">int</span> port = <span class="local-variable">this</span>.environment.getProperty(<span class="string"><span class="delimiter">&quot;</span><span class="content">local.mongo.port</span><span class="delimiter">&quot;</span></span>, <span class="predefined-type">Integer</span>.class);

  813.         <span class="keyword">return</span> <span class="keyword">new</span> MongoClient(<span class="string"><span class="delimiter">&quot;</span><span class="content">localhost</span><span class="delimiter">&quot;</span></span>,port);

  814.     }

  815. 

  816. 

  817. }</code></pre>

  818. </div>

  819. </div>

  820. <div class="colist arabic">

  821. <ol>

  822. <li>

  823. <p>Take a look that the <strong>MongoClient</strong> that it will be created after the <strong><em>embeddedMongoServer</em></strong> bean (due the <strong>@DependsOn</strong> annotation).</p>

  824. </li>

  825. </ol>

  826. </div>

  827. </li>

  828. <li>

  829. <p>If you run your application, it should work with out any issues, the only difference is that you are using an <strong>Embedded MongoDB</strong>.</p>

  830. </li>

  831. <li>

  832. <p>Create (or copy/reuse from another Lab) a <strong>io.pivotal.workshop.snippet.config.SnippetProperties</strong> class. This class will have just the path where the snippet will be read.</p>

  833. <div class="listingblock">

  834. <div class="title">src/main/java/io/pivotal/workshop/snippet/config/SnippetProperties.java</div>

  835. <div class="content">

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

  837. 

  838. <span class="keyword">import</span> <span class="include">org.springframework.boot.context.properties.ConfigurationProperties</span>;

  839. 

  840. <span class="annotation">@ConfigurationProperties</span>(prefix = <span class="string"><span class="delimiter">&quot;</span><span class="content">snippet</span><span class="delimiter">&quot;</span></span>)

  841. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetProperties</span> {

  842. 

  843.         <span class="directive">private</span> <span class="predefined-type">String</span> path = <span class="string"><span class="delimiter">&quot;</span><span class="content">/tmp</span><span class="delimiter">&quot;</span></span>;

  844.         <span class="directive">private</span> <span class="predefined-type">String</span> extension = <span class="string"><span class="delimiter">&quot;</span><span class="content">*.code</span><span class="delimiter">&quot;</span></span>;

  845. 

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

  847.                 <span class="keyword">return</span> path;

  848.         }

  849. 

  850.         <span class="directive">public</span> <span class="type">void</span> setPath(<span class="predefined-type">String</span> path) {

  851.                 <span class="local-variable">this</span>.path = path;

  852.         }

  853. 

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

  855.         <span class="keyword">return</span> extension;

  856.     }

  857. 

  858.     <span class="directive">public</span> <span class="type">void</span> setExtension(<span class="predefined-type">String</span> extension) {

  859.         <span class="local-variable">this</span>.extension = extension;

  860.     }

  861. }</code></pre>

  862. </div>

  863. </div>

  864. </li>

  865. <li>

  866. <p>Next lets create the <strong>Stream Source</strong>. Create the <strong>io.pivotal.workshop.snippet.stream.SnippetFileSystemIntegration</strong> class, in this class we are going to use <strong>Spring Integration</strong> with <strong>Spring Cloud Stream</strong>:</p>

  867. <div class="listingblock">

  868. <div class="title">src/main/java/io/pivotal/workshop/snippet/stream/SnippetFileSystemIntegration.java</div>

  869. <div class="content">

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

  871. 

  872. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.config.SnippetProperties</span>;

  873. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.integration.SnippetTransformer</span>;

  874. <span class="keyword">import</span> <span class="include">org.springframework.boot.context.properties.EnableConfigurationProperties</span>;

  875. <span class="keyword">import</span> <span class="include">org.springframework.cloud.stream.annotation.EnableBinding</span>;

  876. <span class="keyword">import</span> <span class="include">org.springframework.cloud.stream.messaging.Source</span>;

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

  878. <span class="keyword">import</span> <span class="include">org.springframework.integration.dsl.IntegrationFlow</span>;

  879. <span class="keyword">import</span> <span class="include">org.springframework.integration.dsl.IntegrationFlows</span>;

  880. <span class="keyword">import</span> <span class="include">org.springframework.integration.dsl.Pollers</span>;

  881. <span class="keyword">import</span> <span class="include">org.springframework.integration.dsl.Transformers</span>;

  882. <span class="keyword">import</span> <span class="include">org.springframework.integration.file.dsl.Files</span>;

  883. <span class="keyword">import</span> <span class="include">org.springframework.integration.file.transformer.FileToStringTransformer</span>;

  884. 

  885. <span class="keyword">import</span> <span class="include">java.io.File</span>;

  886. 

  887. <span class="annotation">@EnableConfigurationProperties</span>(SnippetProperties.class)

  888. <span class="annotation">@EnableBinding</span>(<span class="predefined-type">Source</span>.class)

  889. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetFileSystemIntegration</span> {

  890. 

  891.     <span class="directive">private</span> SnippetProperties snippetProperties;

  892.     <span class="directive">private</span> SnippetTransformer snippetTransformer;

  893. 

  894.     <span class="directive">public</span> SnippetFileSystemIntegration(SnippetProperties snippetProperties, SnippetTransformer snippetTransformer) {  <span class="comment">//</span><b class="conum">(1)</b>

  895.         <span class="local-variable">this</span>.snippetProperties = snippetProperties;

  896.         <span class="local-variable">this</span>.snippetTransformer = snippetTransformer;

  897.     }

  898. 

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

  900.     <span class="directive">public</span> IntegrationFlow snippetFlow(){   <span class="comment">//</span><b class="conum">(2)</b>

  901.         <span class="keyword">return</span>

  902.                 IntegrationFlows.from(

  903.                         Files

  904.                             .inboundAdapter(<span class="keyword">new</span> <span class="predefined-type">File</span>(<span class="local-variable">this</span>.snippetProperties.getPath()))   <span class="comment">//</span><b class="conum">(3)</b>

  905.                             .preventDuplicates(<span class="predefined-constant">true</span>)

  906.                             .patternFilter(<span class="local-variable">this</span>.snippetProperties.getExtension()),

  907.                         e -&gt; e.poller(Pollers.fixedDelay(<span class="integer">5000L</span>)))                  <span class="comment">//</span><b class="conum">(4)</b>

  908.                 .transform(<span class="keyword">new</span> FileToStringTransformer())                                 <span class="comment">//</span><b class="conum">(5)</b>

  909.                 .transform(Transformers.converter(<span class="local-variable">this</span>.snippetTransformer))               <span class="comment">//</span><b class="conum">(6)</b>

  910.                 .channel(<span class="predefined-type">Source</span>.OUTPUT)                                                   <span class="comment">//</span><b class="conum">(7)</b>

  911.                 .get();

  912. 

  913.     }

  914. 

  915. }</code></pre>

  916. </div>

  917. </div>

  918. <div class="colist arabic">

  919. <ol>

  920. <li>

  921. <p>The constructor is using the <strong>SnippetProperties</strong> and the <strong>SnippetTransformer</strong> (that we are going create later) instances.</p>

  922. </li>

  923. <li>

  924. <p>We are declaring the <strong>IntegrationFlow</strong> (this is part of <strong>Spring Integration</strong>) that will read files from the directory (from the <strong>snippet.path</strong> property).</p>

  925. </li>

  926. <li>

  927. <p><strong>Spring Integration</strong> provides an <strong>Inbound Adapter</strong> that will read the files with the extension provided (from the <strong>snippet.extension</strong> property).</p>

  928. </li>

  929. <li>

  930. <p>The <strong>Inbound Adapter</strong> will polling from file very 5 seconds (<strong>Poller</strong>).</p>

  931. </li>

  932. <li>

  933. <p>We are going to use a transform that will read the file and convert it into a <strong>String</strong>. The class <strong>FileToStringTransformer</strong> is part of the <strong>Spring Integration</strong> out-of-the-box utility classes.</p>

  934. </li>

  935. <li>

  936. <p>This transformer uses a custom transformer (<strong>SnippetTransformer</strong>), the previous transformer will send the text in the file into this new transformer.</p>

  937. </li>

  938. <li>

  939. <p>This will be the final step, where to send the transformed message (a <strong>Snippet</strong> object), in this case it will use a channel named: <strong>OUTPUT</strong>.</p>

  940. </li>

  941. </ol>

  942. </div>

  943. </li>

  944. <li>

  945. <p>Create the <strong>io.pivotal.workshop.snippet.integration.SnippetTransformer</strong> class, this class will transform the <strong>String</strong> into an <strong>Snippet</strong> object.</p>

  946. <div class="listingblock">

  947. <div class="title">src/main/java/io/pivotal/workshop/snippet/integration/SnippetTransformer.java</div>

  948. <div class="content">

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

  950. 

  951. 

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

  953. <span class="keyword">import</span> <span class="include">org.springframework.core.convert.converter.Converter</span>;

  954. <span class="keyword">import</span> <span class="include">org.springframework.lang.Nullable</span>;

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

  956. <span class="keyword">import</span> <span class="include">org.yaml.snakeyaml.Yaml</span>;

  957. 

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

  959. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetTransformer</span> <span class="directive">implements</span> Converter&lt;<span class="predefined-type">String</span>,Snippet&gt; { <span class="comment">//</span><b class="conum">(1)</b>

  960. 

  961.     <span class="annotation">@Nullable</span>

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

  963.     <span class="directive">public</span> Snippet convert(<span class="predefined-type">String</span> snippet) {

  964.         <span class="keyword">return</span> <span class="keyword">new</span> Yaml().loadAs(snippet,Snippet.class);                <span class="comment">//</span><b class="conum">(2)</b>

  965.     }

  966. }</code></pre>

  967. </div>

  968. </div>

  969. <div class="colist arabic">

  970. <ol>

  971. <li>

  972. <p>Here we need to be compliant witht the <strong>Converter</strong> interface. This a generic interface, its first type is what it receives (the <strong>String</strong>, the file&#8217;s content) and the second, the object converted to (the <strong>Snippet</strong> object).</p>

  973. </li>

  974. <li>

  975. <p>We are using the <strong>Yaml</strong> object (meaning that our file will have a <strong>YAML</strong> format) to convert it to <strong>Snippet</strong>.</p>

  976. </li>

  977. </ol>

  978. </div>

  979. </li>

  980. <li>

  981. <p>Next, open the <strong>src/main/resources/application.properties</strong> file a modify it to look like this:</p>

  982. <div class="listingblock">

  983. <div class="title">src/main/resources/application.properties</div>

  984. <div class="content">

  985. <pre class="CodeRay highlight"><code data-lang="properties"># Snippet

  986. snippet.path=/tmp/snippets

  987. snippet.extension=*.code

  988. 

  989. spring.cloud.stream.bindings.output.destination=snippet</code></pre>

  990. </div>

  991. </div>

  992. <div class="paragraph">

  993. <p>The <strong>spring.cloud.stream.bindings.output.destination</strong> is the property that specifies the <strong>output</strong> channel where the message will be sent (in this case the <strong>Snippet</strong> object)</p>

  994. </div>

  995. </li>

  996. <li>

  997. <p>Now we are ready, but before running or testing it, we are going to create another application that will receive the <strong>Snippet</strong> object and just print it out into the console.</p>

  998. </li>

  999. </ol>

  1000. </div>

  1001. </div>

  1002. </div>

  1003. <div class="sect1">

  1004. <h2 id="_code_snippet_manager_stream_log_app_sink">Code Snippet Manager Stream Log App - Sink</h2>

  1005. <div class="sectionbody">

  1006. <div class="paragraph">

  1007. <p>We are going create now a <strong>Sink</strong>. This <strong>Sink</strong> will just print out the <strong>Snippet</strong> object that was sent by the previous app.</p>

  1008. </div>

  1009. <div class="olist arabic">

  1010. <ol class="arabic">

  1011. <li>

  1012. <p>Open a browser and hit the url: <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></p>

  1013. </li>

  1014. <li>

  1015. <p>Click the <strong><em>Switch to the full version</em></strong> link.</p>

  1016. </li>

  1017. <li>

  1018. <p>Fill out the Code Snippet Manager Log App Project metadata with (See Figure 1.0):</p>

  1019. <table class="tableblock frame-all grid-all spread">

  1020. <caption class="title">Table 2. Code Snippet Manager Stream Log App Sink - metadata</caption>

  1021. <colgroup>

  1022. <col style="width: 16.6666%;">

  1023. <col style="width: 83.3334%;">

  1024. </colgroup>

  1025. <thead>

  1026. <tr>

  1027. <th class="tableblock halign-left valign-top">Property</th>

  1028. <th class="tableblock halign-left valign-top">Value</th>

  1029. </tr>

  1030. </thead>

  1031. <tbody>

  1032. <tr>

  1033. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Group</strong>:</p></td>

  1034. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop</em></p></td>

  1035. </tr>

  1036. <tr>

  1037. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Artifact</strong>:</p></td>

  1038. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-stream-log</em></p></td>

  1039. </tr>

  1040. <tr>

  1041. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Name</strong>:</p></td>

  1042. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-stream-log</em></p></td>

  1043. </tr>

  1044. <tr>

  1045. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Package Name</strong>:</p></td>

  1046. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop.snippet</em></p></td>

  1047. </tr>

  1048. <tr>

  1049. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Dependencies</strong>:</p></td>

  1050. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>DevTools</em>, <em>Actuator</em>, <em>Stream Rabbit</em>, <em>Integration</em></p></td>

  1051. </tr>

  1052. <tr>

  1053. <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Spring Boot</strong>:</p></td>

  1054. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>2.0.0.M7</em></p></td>

  1055. </tr>

  1056. </tbody>

  1057. </table>

  1058. <div class="paragraph">

  1059. <div class="title">Figure 1.0: Spring Initializr - <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></div>

  1060. <p><span class="image"><img src="images/12-spring-boot-cloud-stream-02.png" alt="SpringInitializr" title="Spring Initializr"></span></p>

  1061. </div>

  1062. <div class="admonitionblock tip">

  1063. <table>

  1064. <tr>

  1065. <td class="icon">

  1066. <div class="title">Tip</div>

  1067. </td>

  1068. <td class="content">

  1069. You can choose either <strong>Maven</strong> or <strong>Gradle</strong> project types.

  1070. </td>

  1071. </tr>

  1072. </table>

  1073. </div>

  1074. </li>

  1075. <li>

  1076. <p>Type <strong>DevTools</strong>, <strong>Actuator</strong>, <strong>Stream Rabbit</strong> and <strong>Integration</strong> in the <strong><em>Dependencies</em></strong> field and press Enter.</p>

  1077. </li>

  1078. <li>

  1079. <p>Click the <strong><em>Generate Project</em></strong> button.</p>

  1080. </li>

  1081. <li>

  1082. <p>Unzip the file in any directory you want.</p>

  1083. </li>

  1084. <li>

  1085. <p>Import your project in any IDE you want.</p>

  1086. </li>

  1087. <li>

  1088. <p>Copy only the <strong>Language</strong> and <strong>Snippet</strong> classes over. <strong>REMOVE</strong> the <strong>@Document</strong>, <strong>@Id</strong> and <strong>@DebRef</strong> annotations, we are not going to use them.</p>

  1089. </li>

  1090. <li>

  1091. <p>Create the <strong>io.pivotal.workshop.snippet.stream.SnippetLogger</strong> class.</p>

  1092. <div class="listingblock java">

  1093. <div class="title">src/main/java/io/pivotal/workshop/snippet/stream/SnippetLogger.java</div>

  1094. <div class="content">

  1095. <pre class="CodeRay highlight"><code>package io.pivotal.workshop.snippet.stream;

  1096. 

  1097. import io.pivotal.workshop.snippet.domain.Snippet;

  1098. import org.slf4j.Logger;

  1099. import org.slf4j.LoggerFactory;

  1100. import org.springframework.cloud.stream.annotation.EnableBinding;

  1101. import org.springframework.cloud.stream.annotation.StreamListener;

  1102. import org.springframework.cloud.stream.messaging.Sink;

  1103. 

  1104. @EnableBinding(Sink.class)

  1105. public class SnippetLogger {

  1106. 

  1107.     private Logger log = LoggerFactory.getLogger("[SNIPPET LOGGER]");

  1108. 

  1109.     @StreamListener(Sink.INPUT) //<b class="conum">(1)</b>

  1110.     public void log(Snippet snippet){

  1111.         log.info(snippet.toString());

  1112.     }

  1113. }</code></pre>

  1114. </div>

  1115. </div>

  1116. <div class="colist arabic">

  1117. <ol>

  1118. <li>

  1119. <p>Here the importat part is the use of the <strong>@StreamListener(Sink.INPUT)</strong> annotation that will listen for any incoming <strong>Snippet</strong> message through the <strong>INPUT</strong> channel. Then it will be just logged.</p>

  1120. </li>

  1121. </ol>

  1122. </div>

  1123. </li>

  1124. <li>

  1125. <p>Open the <strong>src/main/resources/application.properties</strong> file and modify it to look like this:</p>

  1126. <div class="listingblock">

  1127. <div class="title">src/main/resources/application.properties</div>

  1128. <div class="content">

  1129. <pre class="CodeRay highlight"><code data-lang="properties">server.port=8181

  1130. spring.cloud.stream.bindings.input.destination=snippet</code></pre>

  1131. </div>

  1132. </div>

  1133. <div class="paragraph">

  1134. <p>See that here we are going to use the <strong>port</strong> 8181 and the <strong>spring.cloud.stream.bindings.input.destination</strong> property that will be listen to (in this case the input channel: <strong>snippet</strong>).</p>

  1135. </div>

  1136. </li>

  1137. <li>

  1138. <p>Now is time to test these microservices!</p>

  1139. </li>

  1140. </ol>

  1141. </div>

  1142. </div>

  1143. </div>

  1144. <div class="sect1">

  1145. <h2 id="_testing">Testing</h2>

  1146. <div class="sectionbody">

  1147. <div class="paragraph">

  1148. <p>This part of the lab involves testing directly into these two microservices.</p>

  1149. </div>

  1150. <div class="olist arabic">

  1151. <ol class="arabic">

  1152. <li>

  1153. <p>Make sure you have <strong>RabbitMQ</strong> up and running.</p>

  1154. </li>

  1155. <li>

  1156. <p>Make sure you have the <strong>/tmp/snippets</strong> (or <strong>C:\tmp\snippets</strong>) directory with write permissions.</p>

  1157. </li>

  1158. <li>

  1159. <p>Start your <strong>code-snippet-manager-stream-log</strong> application.</p>

  1160. </li>

  1161. <li>

  1162. <p>Start your <strong>code-snippet-manager-stream</strong> application.</p>

  1163. </li>

  1164. <li>

  1165. <p>Create some code snippets files <strong>OUTSIDE</strong> the <strong>/tmp/snippets</strong> (or <strong>C:\tmp\snippets</strong>) directory first. These files will have a <strong>YAML</strong> format and they will contain a particular structure:</p>

  1166. <div class="listingblock">

  1167. <div class="title">hello-world-erl.code</div>

  1168. <div class="content">

  1169. <pre class="CodeRay highlight"><code data-lang="yaml"><span class="key">title</span>: <span class="string"><span class="content">Hello World</span></span>

  1170. <span class="key">description</span>: <span class="string"><span class="content">A Erlang Hello World</span></span>

  1171. <span class="key">lang</span>: <span class="string"><span class="content">{</span><span class="content">

  1172.   name: Erlang,

  1173.   syntax: erl

  1174.   }</span></span>

  1175. <span class="key">code</span>: <span class="string"><span class="delimiter">|</span><span class="content">

  1176.   -module(hello).

  1177.   -export([hello_world/0]).

  1178. 

  1179.   hello_world() -&gt; io:fwrite(&quot;hello, world\n&quot;).</span></span></code></pre>

  1180. </div>

  1181. </div>

  1182. <div class="listingblock">

  1183. <div class="title">hello-world-javascript.code</div>

  1184. <div class="content">

  1185. <pre class="CodeRay highlight"><code data-lang="yaml"><span class="key">title</span>: <span class="string"><span class="content">Hello World</span></span>

  1186. <span class="key">description</span>: <span class="string"><span class="content">A JavaScript Hello World</span></span>

  1187. <span class="key">lang</span>: <span class="string"><span class="content">{</span><span class="content">

  1188.   name: JavaScript,

  1189.   syntax: js

  1190.   }</span></span>

  1191. <span class="key">code</span>: <span class="string"><span class="delimiter">|</span><span class="content">

  1192.     console.log(&quot;Hello World&quot;);</span></span></code></pre>

  1193. </div>

  1194. </div>

  1195. </li>

  1196. <li>

  1197. <p>Copy these files into the <strong>/tmp/snippets</strong> (or <strong>C:\tmp\snippets</strong>) directory.</p>

  1198. </li>

  1199. <li>

  1200. <p>See how the <strong>code-snippet-manager-stream-log</strong> application print the receive <strong>Snippet</strong> objects.</p>

  1201. </li>

  1202. </ol>

  1203. </div>

  1204. <div class="sect2">

  1205. <h3 id="_challenges">Challenges</h3>

  1206. <div class="ulist">

  1207. <ul>

  1208. <li>

  1209. <p>In the <strong>SnippetTransformer</strong> add a logic to save the <strong>Snippet</strong> into the <strong>Embedded MongoDB</strong> so it can be viewed over the <a href="http://localhost:8080/logs" class="bare" target="_blank">http://localhost:8080/logs</a> and the <a href="http://localhost:8080/snippets" class="bare" target="_blank">http://localhost:8080/snippets</a>:</p>

  1210. <div class="ulist">

  1211. <ul>

  1212. <li>

  1213. <p>Create a <strong>io.pivotal.workshop.snippet.service.SnippetService</strong> class. This class will be a facade for all repository operations so it can be reused by the <strong>SnippetHandler</strong> and the <strong>SnippetTransformer</strong> classes.</p>

  1214. </li>

  1215. </ul>

  1216. </div>

  1217. </li>

  1218. </ul>

  1219. </div>

  1220. </div>

  1221. </div>

  1222. </div>

  1223. <div class="sect1">

  1224. <h2 id="_homework">HOMEWORK</h2>

  1225. <div class="sectionbody">

  1226. <div class="ulist">

  1227. <ul>

  1228. <li>

  1229. <p>Review the following link to get more information about <strong>Spring Cloud Projects</strong>: <a href="http://projects.spring.io/spring-cloud/" class="bare" target="_blank">http://projects.spring.io/spring-cloud/</a></p>

  1230. </li>

  1231. </ul>

  1232. </div>

  1233. </div>

  1234. </div>

  1235. </div>

  1236. <div id="footer">

  1237. <div id="footer-text">

  1238. Last updated 2017-11-30 10:37:57 PST

  1239. </div>

  1240. </div>

  1241. </body>

  1242. </html>