kristofer
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PivotalLabsAndSamples


			
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<body class="article toc2 toc-left">
<div id="header">
<h1><a id="spring-boot-security"></a>Spring Boot - Spring Integration and Spring Cloud Stream</h1>
<div id="toc" class="toc2">
<div id="toctitle">Labs</div>
<ul class="sectlevel1">
<li><a href="#_requirements">Requirements</a></li>
<li><a href="#_code_snippet_manager_stream_app_source">Code Snippet Manager Stream App - Source</a></li>
<li><a href="#_code_snippet_manager_stream_log_app_sink">Code Snippet Manager Stream Log App - Sink</a></li>
<li><a href="#_testing">Testing</a>
<ul class="sectlevel2">
<li><a href="#_challenges">Challenges</a></li>
</ul>
</li>
<li><a href="#_homework">HOMEWORK</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<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.
<strong>Time:</strong> 30 minutes.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_requirements">Requirements</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>You will need <strong>RabbitMQ</strong> up and running.</p>
</li>
</ul>
</div>
<!-- toc disabled -->
</div>
</div>
<div class="sect1">
<h2 id="_code_snippet_manager_stream_app_source">Code Snippet Manager Stream App - Source</h2>
<div class="sectionbody">
<div class="paragraph">
<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>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Open a browser and hit the url: <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></p>
</li>
<li>
<p>Click the <strong><em>Switch to the full version</em></strong> link.</p>
</li>
<li>
<p>Fill out the Code Snippet Manager Stream App Project metadata with (See Figure 1.0):</p>
<table class="tableblock frame-all grid-all spread">
<caption class="title">Table 1. Code Snippet Manager Stream App Source - metadata</caption>
<colgroup>
<col style="width: 16.6666%;">
<col style="width: 83.3334%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Property</th>
<th class="tableblock halign-left valign-top">Value</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Group</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop</em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Artifact</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-stream</em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Name</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-stream</em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Package Name</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop.snippet</em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Dependencies</strong>:</p></td>
<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>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Spring Boot</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>2.0.0.M7</em></p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<div class="title">Figure 1.0: Spring Initializr - <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></div>
<p><span class="image"><img src="images/12-spring-boot-cloud-stream-01.png" alt="SpringInitializr" title="Spring Initializr"></span></p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<div class="title">Tip</div>
</td>
<td class="content">
You can choose either <strong>Maven</strong> or <strong>Gradle</strong> project types.
</td>
</tr>
</table>
</div>
</li>
<li>
<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>
</li>
<li>
<p>Click the <strong><em>Generate Project</em></strong> button.</p>
</li>
<li>
<p>Unzip the file in any directory you want.</p>
</li>
<li>
<p>Import your project in any IDE you want.</p>
</li>
<li>
<p>Copy <strong>ONLY</strong> the classes from the previous Lab (<strong><em>WebFlux</em></strong>), we are going to reuse them.</p>
</li>
<li>
<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>
<div class="listingblock">
<div class="title">pom.xml</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>
        <span class="tag">&lt;groupId&gt;</span>org.springframework.cloud<span class="tag">&lt;/groupId&gt;</span>
        <span class="tag">&lt;artifactId&gt;</span>spring-cloud-starter-stream-rabbit<span class="tag">&lt;/artifactId&gt;</span>
    <span class="tag">&lt;exclusions&gt;</span>
        <span class="tag">&lt;exclusion&gt;</span>
            <span class="tag">&lt;groupId&gt;</span>org.springframework.boot<span class="tag">&lt;/groupId&gt;</span>
            <span class="tag">&lt;artifactId&gt;</span>spring-boot-starter-tomcat<span class="tag">&lt;/artifactId&gt;</span>
        <span class="tag">&lt;/exclusion&gt;</span>
    <span class="tag">&lt;/exclusions&gt;</span>
<span class="tag">&lt;/dependency&gt;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>or</p>
</div>
<div class="listingblock">
<div class="title">buildf.gradle</div>
<div class="content">
<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>){
    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>
}</code></pre>
</div>
</div>
<div class="paragraph">
<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>
</div>
</li>
<li>
<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>
<div class="listingblock">
<div class="title">pom.xml</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>
        <span class="tag">&lt;groupId&gt;</span>de.flapdoodle.embed<span class="tag">&lt;/groupId&gt;</span>
    <span class="tag">&lt;artifactId&gt;</span>de.flapdoodle.embed.mongo<span class="tag">&lt;/artifactId&gt;</span>
    <span class="tag">&lt;scope&gt;</span>runtime<span class="tag">&lt;/scope&gt;</span>
<span class="tag">&lt;/dependency&gt;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>or</p>
</div>
<div class="listingblock">
<div class="title">build.gradle</div>
<div class="content">
<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>
</div>
</div>
</li>
<li>
<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>
<div class="listingblock">
<div class="title">pom.xml</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>
    <span class="tag">&lt;groupId&gt;</span>org.springframework.integration<span class="tag">&lt;/groupId&gt;</span>
    <span class="tag">&lt;artifactId&gt;</span>spring-integration-file<span class="tag">&lt;/artifactId&gt;</span>
<span class="tag">&lt;/dependency&gt;</span>
<span class="tag">&lt;dependency&gt;</span>
    <span class="tag">&lt;groupId&gt;</span>org.springframework.integration<span class="tag">&lt;/groupId&gt;</span>
    <span class="tag">&lt;artifactId&gt;</span>spring-integration-java-dsl<span class="tag">&lt;/artifactId&gt;</span>
<span class="tag">&lt;/dependency&gt;</span>
<span class="tag">&lt;dependency&gt;</span>
    <span class="tag">&lt;groupId&gt;</span>org.yaml<span class="tag">&lt;/groupId&gt;</span>
    <span class="tag">&lt;artifactId&gt;</span>snakeyaml<span class="tag">&lt;/artifactId&gt;</span>
<span class="tag">&lt;/dependency&gt;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>or</p>
</div>
<div class="listingblock">
<div class="title">build.gradle</div>
<div class="content">
<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>)
compile(<span class="string"><span class="delimiter">'</span><span class="content">org.springframework.integration:spring-integration-java-dsl</span><span class="delimiter">'</span></span>)
compile(<span class="string"><span class="delimiter">'</span><span class="content">org.yaml:snakeyaml</span><span class="delimiter">'</span></span>)</code></pre>
</div>
</div>
</li>
<li>
<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>
<div class="listingblock">
<div class="title">src/main/java/io/pivotal/workshop/snippet/config/SnippetConfig.java</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.config</span>;

<span class="keyword">import</span> <span class="include">com.mongodb.MongoClient</span>;
<span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Bean</span>;
<span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Configuration</span>;
<span class="keyword">import</span> <span class="include">org.springframework.context.annotation.DependsOn</span>;
<span class="keyword">import</span> <span class="include">org.springframework.core.env.Environment</span>;

<span class="annotation">@Configuration</span>
<span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetConfiguration</span> {


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

    <span class="directive">public</span> SnippetConfiguration(Environment environment) {
        <span class="local-variable">this</span>.environment = environment;
    }


    <span class="annotation">@Bean</span>
    <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>
    <span class="directive">public</span> MongoClient reactiveMongoClient() {
        <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);
        <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);
    }


}</code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<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>
</li>
</ol>
</div>
</li>
<li>
<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>
</li>
<li>
<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>
<div class="listingblock">
<div class="title">src/main/java/io/pivotal/workshop/snippet/config/SnippetProperties.java</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.config</span>;

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

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

        <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>;
        <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>;

        <span class="directive">public</span> <span class="predefined-type">String</span> getPath() {
                <span class="keyword">return</span> path;
        }

        <span class="directive">public</span> <span class="type">void</span> setPath(<span class="predefined-type">String</span> path) {
                <span class="local-variable">this</span>.path = path;
        }

    <span class="directive">public</span> <span class="predefined-type">String</span> getExtension() {
        <span class="keyword">return</span> extension;
    }

    <span class="directive">public</span> <span class="type">void</span> setExtension(<span class="predefined-type">String</span> extension) {
        <span class="local-variable">this</span>.extension = extension;
    }
}</code></pre>
</div>
</div>
</li>
<li>
<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>
<div class="listingblock">
<div class="title">src/main/java/io/pivotal/workshop/snippet/stream/SnippetFileSystemIntegration.java</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.stream</span>;

<span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.config.SnippetProperties</span>;
<span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.integration.SnippetTransformer</span>;
<span class="keyword">import</span> <span class="include">org.springframework.boot.context.properties.EnableConfigurationProperties</span>;
<span class="keyword">import</span> <span class="include">org.springframework.cloud.stream.annotation.EnableBinding</span>;
<span class="keyword">import</span> <span class="include">org.springframework.cloud.stream.messaging.Source</span>;
<span class="keyword">import</span> <span class="include">org.springframework.context.annotation.Bean</span>;
<span class="keyword">import</span> <span class="include">org.springframework.integration.dsl.IntegrationFlow</span>;
<span class="keyword">import</span> <span class="include">org.springframework.integration.dsl.IntegrationFlows</span>;
<span class="keyword">import</span> <span class="include">org.springframework.integration.dsl.Pollers</span>;
<span class="keyword">import</span> <span class="include">org.springframework.integration.dsl.Transformers</span>;
<span class="keyword">import</span> <span class="include">org.springframework.integration.file.dsl.Files</span>;
<span class="keyword">import</span> <span class="include">org.springframework.integration.file.transformer.FileToStringTransformer</span>;

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

<span class="annotation">@EnableConfigurationProperties</span>(SnippetProperties.class)
<span class="annotation">@EnableBinding</span>(<span class="predefined-type">Source</span>.class)
<span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetFileSystemIntegration</span> {

    <span class="directive">private</span> SnippetProperties snippetProperties;
    <span class="directive">private</span> SnippetTransformer snippetTransformer;

    <span class="directive">public</span> SnippetFileSystemIntegration(SnippetProperties snippetProperties, SnippetTransformer snippetTransformer) {  <span class="comment">//</span><b class="conum">(1)</b>
        <span class="local-variable">this</span>.snippetProperties = snippetProperties;
        <span class="local-variable">this</span>.snippetTransformer = snippetTransformer;
    }

    <span class="annotation">@Bean</span>
    <span class="directive">public</span> IntegrationFlow snippetFlow(){   <span class="comment">//</span><b class="conum">(2)</b>
        <span class="keyword">return</span>
                IntegrationFlows.from(
                        Files
                            .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>
                            .preventDuplicates(<span class="predefined-constant">true</span>)
                            .patternFilter(<span class="local-variable">this</span>.snippetProperties.getExtension()),
                        e -&gt; e.poller(Pollers.fixedDelay(<span class="integer">5000L</span>)))                  <span class="comment">//</span><b class="conum">(4)</b>
                .transform(<span class="keyword">new</span> FileToStringTransformer())                                 <span class="comment">//</span><b class="conum">(5)</b>
                .transform(Transformers.converter(<span class="local-variable">this</span>.snippetTransformer))               <span class="comment">//</span><b class="conum">(6)</b>
                .channel(<span class="predefined-type">Source</span>.OUTPUT)                                                   <span class="comment">//</span><b class="conum">(7)</b>
                .get();

    }

}</code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<p>The constructor is using the <strong>SnippetProperties</strong> and the <strong>SnippetTransformer</strong> (that we are going create later) instances.</p>
</li>
<li>
<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>
</li>
<li>
<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>
</li>
<li>
<p>The <strong>Inbound Adapter</strong> will polling from file very 5 seconds (<strong>Poller</strong>).</p>
</li>
<li>
<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>
</li>
<li>
<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>
</li>
<li>
<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>
</li>
</ol>
</div>
</li>
<li>
<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>
<div class="listingblock">
<div class="title">src/main/java/io/pivotal/workshop/snippet/integration/SnippetTransformer.java</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.integration</span>;


<span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.domain.Snippet</span>;
<span class="keyword">import</span> <span class="include">org.springframework.core.convert.converter.Converter</span>;
<span class="keyword">import</span> <span class="include">org.springframework.lang.Nullable</span>;
<span class="keyword">import</span> <span class="include">org.springframework.stereotype.Component</span>;
<span class="keyword">import</span> <span class="include">org.yaml.snakeyaml.Yaml</span>;

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

    <span class="annotation">@Nullable</span>
    <span class="annotation">@Override</span>
    <span class="directive">public</span> Snippet convert(<span class="predefined-type">String</span> snippet) {
        <span class="keyword">return</span> <span class="keyword">new</span> Yaml().loadAs(snippet,Snippet.class);                <span class="comment">//</span><b class="conum">(2)</b>
    }
}</code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<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>
</li>
<li>
<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>
</li>
</ol>
</div>
</li>
<li>
<p>Next, open the <strong>src/main/resources/application.properties</strong> file a modify it to look like this:</p>
<div class="listingblock">
<div class="title">src/main/resources/application.properties</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="properties"># Snippet
snippet.path=/tmp/snippets
snippet.extension=*.code

spring.cloud.stream.bindings.output.destination=snippet</code></pre>
</div>
</div>
<div class="paragraph">
<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>
</div>
</li>
<li>
<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>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_code_snippet_manager_stream_log_app_sink">Code Snippet Manager Stream Log App - Sink</h2>
<div class="sectionbody">
<div class="paragraph">
<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>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Open a browser and hit the url: <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></p>
</li>
<li>
<p>Click the <strong><em>Switch to the full version</em></strong> link.</p>
</li>
<li>
<p>Fill out the Code Snippet Manager Log App Project metadata with (See Figure 1.0):</p>
<table class="tableblock frame-all grid-all spread">
<caption class="title">Table 2. Code Snippet Manager Stream Log App Sink - metadata</caption>
<colgroup>
<col style="width: 16.6666%;">
<col style="width: 83.3334%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Property</th>
<th class="tableblock halign-left valign-top">Value</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Group</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop</em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Artifact</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-stream-log</em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Name</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>code-snippet-manager-stream-log</em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Package Name</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>io.pivotal.workshop.snippet</em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Dependencies</strong>:</p></td>
<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>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Spring Boot</strong>:</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em>2.0.0.M7</em></p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<div class="title">Figure 1.0: Spring Initializr - <a href="http://start.spring.io" class="bare" target="_blank">http://start.spring.io</a></div>
<p><span class="image"><img src="images/12-spring-boot-cloud-stream-02.png" alt="SpringInitializr" title="Spring Initializr"></span></p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<div class="title">Tip</div>
</td>
<td class="content">
You can choose either <strong>Maven</strong> or <strong>Gradle</strong> project types.
</td>
</tr>
</table>
</div>
</li>
<li>
<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>
</li>
<li>
<p>Click the <strong><em>Generate Project</em></strong> button.</p>
</li>
<li>
<p>Unzip the file in any directory you want.</p>
</li>
<li>
<p>Import your project in any IDE you want.</p>
</li>
<li>
<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>
</li>
<li>
<p>Create the <strong>io.pivotal.workshop.snippet.stream.SnippetLogger</strong> class.</p>
<div class="listingblock java">
<div class="title">src/main/java/io/pivotal/workshop/snippet/stream/SnippetLogger.java</div>
<div class="content">
<pre class="CodeRay highlight"><code>package io.pivotal.workshop.snippet.stream;

import io.pivotal.workshop.snippet.domain.Snippet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.cloud.stream.messaging.Sink;

@EnableBinding(Sink.class)
public class SnippetLogger {

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

    @StreamListener(Sink.INPUT) //<b class="conum">(1)</b>
    public void log(Snippet snippet){
        log.info(snippet.toString());
    }
}</code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<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>
</li>
</ol>
</div>
</li>
<li>
<p>Open the <strong>src/main/resources/application.properties</strong> file and modify it to look like this:</p>
<div class="listingblock">
<div class="title">src/main/resources/application.properties</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="properties">server.port=8181
spring.cloud.stream.bindings.input.destination=snippet</code></pre>
</div>
</div>
<div class="paragraph">
<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>
</div>
</li>
<li>
<p>Now is time to test these microservices!</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_testing">Testing</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This part of the lab involves testing directly into these two microservices.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Make sure you have <strong>RabbitMQ</strong> up and running.</p>
</li>
<li>
<p>Make sure you have the <strong>/tmp/snippets</strong> (or <strong>C:\tmp\snippets</strong>) directory with write permissions.</p>
</li>
<li>
<p>Start your <strong>code-snippet-manager-stream-log</strong> application.</p>
</li>
<li>
<p>Start your <strong>code-snippet-manager-stream</strong> application.</p>
</li>
<li>
<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>
<div class="listingblock">
<div class="title">hello-world-erl.code</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="yaml"><span class="key">title</span>: <span class="string"><span class="content">Hello World</span></span>
<span class="key">description</span>: <span class="string"><span class="content">A Erlang Hello World</span></span>
<span class="key">lang</span>: <span class="string"><span class="content">{</span><span class="content">
  name: Erlang,
  syntax: erl
  }</span></span>
<span class="key">code</span>: <span class="string"><span class="delimiter">|</span><span class="content">
  -module(hello).
  -export([hello_world/0]).

  hello_world() -&gt; io:fwrite(&quot;hello, world\n&quot;).</span></span></code></pre>
</div>
</div>
<div class="listingblock">
<div class="title">hello-world-javascript.code</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="yaml"><span class="key">title</span>: <span class="string"><span class="content">Hello World</span></span>
<span class="key">description</span>: <span class="string"><span class="content">A JavaScript Hello World</span></span>
<span class="key">lang</span>: <span class="string"><span class="content">{</span><span class="content">
  name: JavaScript,
  syntax: js
  }</span></span>
<span class="key">code</span>: <span class="string"><span class="delimiter">|</span><span class="content">
    console.log(&quot;Hello World&quot;);</span></span></code></pre>
</div>
</div>
</li>
<li>
<p>Copy these files into the <strong>/tmp/snippets</strong> (or <strong>C:\tmp\snippets</strong>) directory.</p>
</li>
<li>
<p>See how the <strong>code-snippet-manager-stream-log</strong> application print the receive <strong>Snippet</strong> objects.</p>
</li>
</ol>
</div>
<div class="sect2">
<h3 id="_challenges">Challenges</h3>
<div class="ulist">
<ul>
<li>
<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>
<div class="ulist">
<ul>
<li>
<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>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_homework">HOMEWORK</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<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>
</li>
</ul>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2017-11-30 10:37:57 PST
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