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PivotalLabsAndSamples/student-lab-instructions/11-spring-boot-webflux.html

11-spring-boot-webflux.html 74KB
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  519. 

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  536.     td.content {

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  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>

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  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>");

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  572. </head>

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

  574. <div id="header">

  575. <h1><a id="spring-boot-security"></a>Spring Boot WebFlux</h1>

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

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

  578. <ul class="sectlevel1">

  579. <li><a href="#_code_snippet_manager_app">Code Snippet Manager App</a>

  580. <ul class="sectlevel2">

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

  582. </ul>

  583. </li>

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

  585. </ul>

  586. </div>

  587. </div>

  588. <div id="content">

  589. <div id="preamble">

  590. <div class="sectionbody">

  591. <div class="paragraph">

  592. <p>Get familiar with <strong>Spring Boot</strong> and <strong>WebFlux</strong> features.

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

  594. </div>

  595. <!-- toc disabled -->

  596. </div>

  597. </div>

  598. <div class="sect1">

  599. <h2 id="_code_snippet_manager_app">Code Snippet Manager App</h2>

  600. <div class="sectionbody">

  601. <div class="paragraph">

  602. <p>We are going to make our <strong>Code Snippet Manager</strong> reactive. You will use the <strong>spring-boot-starter-webflux</strong> starter. Remember that Spring WebFlux provides two ways to create a reactive apps: <strong>Functional</strong> and <strong>Annotation-Based</strong>; in this lab will explore both.</p>

  603. </div>

  604. <div class="olist arabic">

  605. <ol class="arabic">

  606. <li>

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

  608. </li>

  609. <li>

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

  611. </li>

  612. <li>

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

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

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

  616. <colgroup>

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

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

  619. </colgroup>

  620. <thead>

  621. <tr>

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

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

  624. </tr>

  625. </thead>

  626. <tbody>

  627. <tr>

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

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

  630. </tr>

  631. <tr>

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

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

  634. </tr>

  635. <tr>

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

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

  638. </tr>

  639. <tr>

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

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

  642. </tr>

  643. <tr>

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

  645. <td class="tableblock halign-left valign-top"><p class="tableblock"><em>Reactive Web</em>, <em>DevTools</em>, <em>MongoDB</em>, <em>Actuator</em></p></td>

  646. </tr>

  647. <tr>

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

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

  650. </tr>

  651. </tbody>

  652. </table>

  653. <div class="paragraph">

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

  655. <p><span class="image"><img src="images/11-spring-boot-webflux-01.png" alt="SpringInitializr" title="Spring Initializr"></span></p>

  656. </div>

  657. <div class="admonitionblock tip">

  658. <table>

  659. <tr>

  660. <td class="icon">

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

  662. </td>

  663. <td class="content">

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

  665. </td>

  666. </tr>

  667. </table>

  668. </div>

  669. </li>

  670. <li>

  671. <p>Type <strong>Reactive Web</strong>, <strong>DevTools</strong>, <strong>MongoDB</strong>, <strong>Reactive MongoDB</strong> and <strong>Actuator</strong> in the <strong><em>Dependencies</em></strong> field and press Enter.</p>

  672. </li>

  673. <li>

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

  675. </li>

  676. <li>

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

  678. </li>

  679. <li>

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

  681. </li>

  682. <li>

  683. <p>Add the following domain classes: <strong>io.pivotal.workshop.snippet.domain.Language</strong> and <strong>io.pivotal.workshop.snippet.domain.Snippet</strong>, practically are the same as before, just a small modifications:</p>

  684. <div class="listingblock">

  685. <div class="title">src/main/java/io/pivotal/workshop/snippet/domain/Language.java</div>

  686. <div class="content">

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

  688. 

  689. <span class="keyword">import</span> <span class="include">org.bson.types.ObjectId</span>;

  690. <span class="keyword">import</span> <span class="include">org.springframework.data.annotation.Id</span>;

  691. <span class="keyword">import</span> <span class="include">org.springframework.data.mongodb.core.mapping.Document</span>;

  692. 

  693. <span class="annotation">@Document</span>

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

  695. 

  696.         <span class="annotation">@Id</span>

  697.         <span class="directive">private</span> <span class="predefined-type">String</span> id;

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

  699.         <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>;

  700. 

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

  702.         }

  703. 

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

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

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

  707.         }

  708. 

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

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

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

  712.         }

  713. 

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

  715.                 <span class="keyword">return</span> id;

  716.         }

  717. 

  718.         <span class="directive">public</span> <span class="type">void</span> setId(<span class="predefined-type">String</span> id) {

  719.                 <span class="local-variable">this</span>.id = id;

  720.         }

  721. 

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

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

  724.         }

  725. 

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

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

  728.         }

  729. 

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

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

  732.         }

  733. 

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

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

  736.         }

  737. 

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

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

  740.         <span class="keyword">return</span> <span class="string"><span class="delimiter">&quot;</span><span class="content">Language{</span><span class="delimiter">&quot;</span></span> +

  741.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">id='</span><span class="delimiter">&quot;</span></span> + id + <span class="string"><span class="delimiter">'</span><span class="char">\'</span><span class="delimiter">'</span></span> +

  742.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, name='</span><span class="delimiter">&quot;</span></span> + name + <span class="string"><span class="delimiter">'</span><span class="char">\'</span><span class="delimiter">'</span></span> +

  743.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, syntax='</span><span class="delimiter">&quot;</span></span> + syntax + <span class="string"><span class="delimiter">'</span><span class="char">\'</span><span class="delimiter">'</span></span> +

  744.                 <span class="string"><span class="delimiter">'</span><span class="content">}</span><span class="delimiter">'</span></span>;

  745.     }

  746. }</code></pre>

  747. </div>

  748. </div>

  749. <div class="listingblock">

  750. <div class="title">src/main/java/io/pivotal/workshop/snippet/domain/Snippet.java</div>

  751. <div class="content">

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

  753. 

  754. <span class="keyword">import</span> <span class="include">org.bson.types.ObjectId</span>;

  755. <span class="keyword">import</span> <span class="include">org.springframework.data.annotation.Id</span>;

  756. <span class="keyword">import</span> <span class="include">org.springframework.data.mongodb.core.mapping.DBRef</span>;

  757. <span class="keyword">import</span> <span class="include">org.springframework.data.mongodb.core.mapping.Document</span>;

  758. 

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

  760. 

  761. <span class="annotation">@Document</span>

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

  763. 

  764.         <span class="annotation">@Id</span>

  765.         <span class="directive">private</span> <span class="predefined-type">String</span> id;

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

  767.         <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>;

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

  769. 

  770.     <span class="annotation">@DBRef</span>

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

  772.     <span class="directive">private</span> <span class="predefined-type">String</span> code;

  773. 

  774.     <span class="directive">private</span> <span class="predefined-type">Date</span> created;

  775.         <span class="directive">private</span> <span class="predefined-type">Date</span> modified;

  776. 

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

  778.                 <span class="local-variable">this</span>.created = <span class="keyword">new</span> <span class="predefined-type">Date</span>();

  779.                 <span class="local-variable">this</span>.modified = <span class="keyword">new</span> <span class="predefined-type">Date</span>();

  780.         }

  781. 

  782.         <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, <span class="predefined-type">String</span> code) {

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

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

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

  786.                 <span class="local-variable">this</span>.description = description;

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

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

  789.         }

  790. 

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

  792.                 <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);

  793.         }

  794. 

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

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

  797.         }

  798. 

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

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

  801.         }

  802. 

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

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

  805.         }

  806. 

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

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

  809.         }

  810. 

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

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

  813.         }

  814. 

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

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

  817.         }

  818. 

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

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

  821.         }

  822. 

  823.         <span class="directive">public</span> <span class="type">void</span> setDescription(<span class="predefined-type">String</span> description) {

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

  825.         }

  826. 

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

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

  829.         }

  830. 

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

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

  833.         }

  834. 

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

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

  837.         }

  838. 

  839.         <span class="directive">public</span> <span class="type">void</span> setCode(<span class="predefined-type">String</span> code) {

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

  841.         }

  842. 

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

  844.                 <span class="keyword">return</span> created;

  845.         }

  846. 

  847.         <span class="directive">public</span> <span class="type">void</span> setCreated(<span class="predefined-type">Date</span> created) {

  848.                 <span class="local-variable">this</span>.created = created;

  849.         }

  850. 

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

  852.                 <span class="keyword">return</span> modified;

  853.         }

  854. 

  855.         <span class="directive">public</span> <span class="type">void</span> setModified(<span class="predefined-type">Date</span> modified) {

  856.                 <span class="local-variable">this</span>.modified = modified;

  857.         }

  858. 

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

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

  861.         <span class="keyword">return</span> <span class="string"><span class="delimiter">&quot;</span><span class="content">Snippet{</span><span class="delimiter">&quot;</span></span> +

  862.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">id='</span><span class="delimiter">&quot;</span></span> + id + <span class="string"><span class="delimiter">'</span><span class="char">\'</span><span class="delimiter">'</span></span> +

  863.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, title='</span><span class="delimiter">&quot;</span></span> + title + <span class="string"><span class="delimiter">'</span><span class="char">\'</span><span class="delimiter">'</span></span> +

  864.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, keywords='</span><span class="delimiter">&quot;</span></span> + keywords + <span class="string"><span class="delimiter">'</span><span class="char">\'</span><span class="delimiter">'</span></span> +

  865.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, description='</span><span class="delimiter">&quot;</span></span> + description + <span class="string"><span class="delimiter">'</span><span class="char">\'</span><span class="delimiter">'</span></span> +

  866.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, lang=</span><span class="delimiter">&quot;</span></span> + lang +

  867.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, code='</span><span class="delimiter">&quot;</span></span> + code + <span class="string"><span class="delimiter">'</span><span class="char">\'</span><span class="delimiter">'</span></span> +

  868.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, created=</span><span class="delimiter">&quot;</span></span> + created +

  869.                 <span class="string"><span class="delimiter">&quot;</span><span class="content">, modified=</span><span class="delimiter">&quot;</span></span> + modified +

  870.                 <span class="string"><span class="delimiter">'</span><span class="content">}</span><span class="delimiter">'</span></span>;

  871.     }

  872. }</code></pre>

  873. </div>

  874. </div>

  875. </li>

  876. <li>

  877. <p>Add the Repositories. Create/Copy the <strong>io.pivotal.workshop.snippet.repository.LanguageRespository.java</strong> and <strong>io.pivotal.workshop.snippet.repository.SnippetRespository.java</strong> interfaces.</p>

  878. <div class="listingblock">

  879. <div class="title">src/main/java/io/pivotal/workshop/snippet/repository/LanguageRepository.java</div>

  880. <div class="content">

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

  882. 

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

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

  885. <span class="keyword">import</span> <span class="include">org.springframework.data.mongodb.repository.MongoRepository</span>;

  886. <span class="keyword">import</span> <span class="include">reactor.core.publisher.Mono</span>;

  887. 

  888. <span class="directive">public</span> <span class="type">interface</span> <span class="class">LanguageRepository</span> <span class="directive">extends</span> MongoRepository&lt;Language, <span class="predefined-type">String</span>&gt; {

  889. 

  890.     Language findByName(<span class="predefined-type">String</span> name);

  891. 

  892. }</code></pre>

  893. </div>

  894. </div>

  895. <div class="listingblock">

  896. <div class="title">src/main/java/io/pivotal/workshop/snippet/repository/SnippetRepository.java</div>

  897. <div class="content">

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

  899. 

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

  901. <span class="keyword">import</span> <span class="include">org.springframework.data.mongodb.repository.MongoRepository</span>;

  902. <span class="keyword">import</span> <span class="include">org.springframework.data.mongodb.repository.Query</span>;

  903. 

  904. <span class="keyword">import</span> <span class="include">java.util.concurrent.CompletableFuture</span>;

  905. <span class="keyword">import</span> <span class="include">java.util.stream.Stream</span>;

  906. 

  907. <span class="directive">public</span> <span class="type">interface</span> <span class="class">SnippetRepository</span> <span class="directive">extends</span> MongoRepository&lt;Snippet, <span class="predefined-type">String</span>&gt; {

  908. 

  909.     <span class="annotation">@Query</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">{}</span><span class="delimiter">&quot;</span></span>)

  910.     Stream&lt;Snippet&gt; findAllAsStream();

  911. }</code></pre>

  912. </div>

  913. </div>

  914. <div class="paragraph">

  915. <p>As you can see in the <strong>SnippetRepository</strong> interface declares a <strong>findAllAsStream</strong> method that returns all the snippets from MongoDB.</p>

  916. </div>

  917. </li>

  918. <li>

  919. <p>Next, lets create the <strong>Reative Server</strong> and the <strong>Functional Router</strong> for the app. Create the <strong>io.pivotal.workshop.snippet.config.SnippetReactive</strong> class:</p>

  920. <div class="listingblock">

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

  922. <div class="content">

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

  924. 

  925. 

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

  927. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.reactive.SnippetHandler</span>;

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

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

  930. <span class="keyword">import</span> <span class="include">org.springframework.http.server.reactive.ReactorHttpHandlerAdapter</span>;

  931. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.server.RouterFunction</span>;

  932. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.server.RouterFunctions</span>;

  933. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.server.ServerResponse</span>;

  934. <span class="keyword">import</span> <span class="include">reactor.core.publisher.EmitterProcessor</span>;

  935. <span class="keyword">import</span> <span class="include">reactor.ipc.netty.http.server.HttpServer</span>;

  936. 

  937. <span class="keyword">import</span> <span class="include">static</span> <span class="include">org.springframework.http.MediaType.APPLICATION_JSON</span>;

  938. <span class="keyword">import</span> <span class="include">static</span> <span class="include">org.springframework.web.reactive.function.server.RequestPredicates</span>.*;

  939. 

  940. 

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

  942. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetReactiveConfig</span> {

  943. 

  944. 

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

  946.     <span class="directive">public</span> HttpServer httpServer(RouterFunction&lt;ServerResponse&gt; router){        <span class="comment">//</span><b class="conum">(1)</b>

  947.         HttpServer server = HttpServer.create(<span class="string"><span class="delimiter">&quot;</span><span class="content">localhost</span><span class="delimiter">&quot;</span></span>, <span class="integer">8080</span>);

  948.         server.newHandler(<span class="keyword">new</span> ReactorHttpHandlerAdapter(RouterFunctions.toHttpHandler(router))).block();

  949.         <span class="keyword">return</span> server;

  950.     }

  951. 

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

  953.     <span class="directive">public</span> RouterFunction&lt;ServerResponse&gt; router(SnippetHandler handler){       <span class="comment">//</span><b class="conum">(2)</b>

  954.         <span class="keyword">return</span> RouterFunctions

  955.                 .route(GET(<span class="string"><span class="delimiter">&quot;</span><span class="content">/snippets</span><span class="delimiter">&quot;</span></span>).and(accept(APPLICATION_JSON)), handler::findAll)

  956.                 .andRoute(GET(<span class="string"><span class="delimiter">&quot;</span><span class="content">/snippets/{id}</span><span class="delimiter">&quot;</span></span>).and(accept(APPLICATION_JSON)),handler::findById)

  957.                 .andRoute(POST(<span class="string"><span class="delimiter">&quot;</span><span class="content">/snippets</span><span class="delimiter">&quot;</span></span>).and(accept(APPLICATION_JSON)),handler::createSnippet);

  958.     }

  959. 

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

  961.     <span class="directive">public</span> EmitterProcessor snippetStream(){                                   <span class="comment">//</span><b class="conum">(3)</b>

  962.         <span class="keyword">return</span> EmitterProcessor.&lt;Snippet&gt;create();

  963.     }

  964. }</code></pre>

  965. </div>

  966. </div>

  967. <div class="colist arabic">

  968. <ol>

  969. <li>

  970. <p>This method returns a <strong>HttpServer</strong> bean class that belongs to the <strong>Netty</strong> package, meaning that the app will run in a <strong>Reactive Server</strong>. This method is receiving a <strong>router</strong> function.</p>

  971. </li>

  972. <li>

  973. <p>This method returns a <strong>RouterFunction</strong> bean as a <strong>ServerResponse</strong> type. It defines what are the endpoints and how they will be handled. In this case we are using the <strong>SnippetHandler</strong> class that will have all the logic for handling all incoming requests.</p>

  974. </li>

  975. <li>

  976. <p>This method returns a <strong>EmitterProcessor</strong> bean that will be use to stream all the new <strong>Snippets</strong> created.</p>

  977. </li>

  978. </ol>

  979. </div>

  980. </li>

  981. <li>

  982. <p>Let&#8217;s continue with the <strong>SnippetHandler</strong>. Create the <strong>io.pivotal.workshop.snippet.reactive.SnippetHandler</strong> class.</p>

  983. <div class="listingblock">

  984. <div class="title">src/main/java/io/pivotal/workshop/snippet/reactive/SnippetHandler.java</div>

  985. <div class="content">

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

  987. 

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

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

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

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

  992. <span class="keyword">import</span> <span class="include">org.springframework.beans.factory.annotation.Autowired</span>;

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

  994. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.BodyInserters</span>;

  995. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.server.ServerRequest</span>;

  996. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.server.ServerResponse</span>;

  997. <span class="keyword">import</span> <span class="include">reactor.core.publisher.EmitterProcessor</span>;

  998. <span class="keyword">import</span> <span class="include">reactor.core.publisher.Flux</span>;

  999. <span class="keyword">import</span> <span class="include">reactor.core.publisher.Mono</span>;

  1000. 

  1001. <span class="keyword">import</span> <span class="include">java.util.Optional</span>;

  1002. 

  1003. <span class="keyword">import</span> <span class="include">static</span> <span class="include">org.springframework.web.reactive.function.server.ServerResponse.notFound</span>;

  1004. <span class="keyword">import</span> <span class="include">static</span> <span class="include">org.springframework.web.reactive.function.server.ServerResponse.ok</span>;

  1005. 

  1006. <span class="annotation">@Component</span>

  1007. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetHandler</span> {

  1008. 

  1009.     <span class="directive">private</span> EmitterProcessor&lt;Snippet&gt; snippetEmitterProcessor;

  1010.     <span class="directive">private</span> SnippetRepository snippetRepository;

  1011.     <span class="directive">private</span> LanguageRepository languageRepository;

  1012. 

  1013.     <span class="annotation">@Autowired</span>  <span class="comment">//</span><b class="conum">(1)</b>

  1014.     <span class="directive">public</span> SnippetHandler(SnippetRepository snippetRepository, LanguageRepository languageRepository, EmitterProcessor&lt;Snippet&gt; snippetEmitterProcessor) {

  1015.         <span class="local-variable">this</span>.snippetRepository = snippetRepository;

  1016.         <span class="local-variable">this</span>.languageRepository = languageRepository;

  1017.         <span class="local-variable">this</span>.snippetEmitterProcessor = snippetEmitterProcessor;

  1018.     }

  1019. 

  1020.     <span class="directive">public</span> Mono&lt;ServerResponse&gt; findAll(ServerRequest request){     <span class="comment">//</span><b class="conum">(2)</b>

  1021.         <span class="keyword">return</span> ok().body(BodyInserters.fromPublisher(Flux.fromStream(<span class="local-variable">this</span>.snippetRepository.findAllAsStream()),Snippet.class));

  1022.     }

  1023. 

  1024.     <span class="directive">public</span> Mono&lt;ServerResponse&gt; findById(ServerRequest request) {

  1025.         <span class="predefined-type">String</span> snippetId = request.pathVariable(<span class="string"><span class="delimiter">&quot;</span><span class="content">id</span><span class="delimiter">&quot;</span></span>);

  1026.         Optional&lt;Snippet&gt; result = <span class="local-variable">this</span>.snippetRepository.findById(snippetId);

  1027.         <span class="keyword">if</span>(result.isPresent())

  1028.             <span class="keyword">return</span> ok().body(BodyInserters.fromPublisher(Mono.just(result.get()),Snippet.class));

  1029.         <span class="keyword">else</span>

  1030.             <span class="keyword">return</span> notFound().build();

  1031.     }

  1032. 

  1033.     <span class="directive">public</span> Mono&lt;ServerResponse&gt; createSnippet(ServerRequest request) {

  1034.         Mono&lt;Snippet&gt; snippetMono = request.bodyToMono(Snippet.class);

  1035.         <span class="keyword">return</span> ok().build(snippetMono.doOnNext(snippetConsumer -&gt; {

  1036.             Language language = <span class="keyword">new</span> Language(<span class="string"><span class="delimiter">&quot;</span><span class="content">Unknown</span><span class="delimiter">&quot;</span></span>,<span class="string"><span class="delimiter">&quot;</span><span class="content">txt</span><span class="delimiter">&quot;</span></span>);

  1037.             <span class="keyword">if</span>(snippetConsumer.getLang()!=<span class="predefined-constant">null</span>){

  1038.                 language = <span class="local-variable">this</span>.languageRepository.findByName(snippetConsumer.getLang().getName());

  1039.                 <span class="keyword">if</span>(language == <span class="predefined-constant">null</span>) {

  1040.                     language = <span class="local-variable">this</span>.languageRepository.save(snippetConsumer.getLang());

  1041.                 }

  1042.             }<span class="keyword">else</span>

  1043.                 language = <span class="local-variable">this</span>.languageRepository.save(language);

  1044. 

  1045.             snippetConsumer.setLang(language);

  1046.             Snippet result = <span class="local-variable">this</span>.snippetRepository.save(snippetConsumer);

  1047.             <span class="local-variable">this</span>.snippetEmitterProcessor.onNext(result);   <span class="comment">//</span><b class="conum">(3)</b>

  1048.         }).then());

  1049.     }

  1050. 

  1051. 

  1052. }</code></pre>

  1053. </div>

  1054. </div>

  1055. <div class="colist arabic">

  1056. <ol>

  1057. <li>

  1058. <p>The constructor will <em>autowired</em> all the repositories and the <strong>EmitterProcessor</strong>.</p>

  1059. </li>

  1060. <li>

  1061. <p>Take a look that all the methods receive a <strong>ServerRequest</strong> and the response is a <strong>Mono&lt;ServerResponse&gt;</strong> type.</p>

  1062. </li>

  1063. <li>

  1064. <p>The <strong>createSnippet</strong> method will handle all the <strong>POST</strong> requests (<strong><em>/snippets</em></strong>) and create the necessary <strong>Language</strong> and <strong>Snippet</strong>, but the most important part here is that it will <strong><em>emit</em></strong> the snippet saved as stream.</p>

  1065. </li>

  1066. </ol>

  1067. </div>

  1068. </li>

  1069. <li>

  1070. <p>Now, let&#8217;s create a rest controller that will stream all the new snippets. Create the <strong>io.pivotal.workshop.snippet.reactive.SnippetController</strong> class.</p>

  1071. <div class="listingblock">

  1072. <div class="title">src/main/java/io/pivotal/workshop/snippet/reactive/SnippetController.java</div>

  1073. <div class="content">

  1074. <pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">io.pivotal.workshop.snippet.reactive</span>;

  1075. 

  1076. <span class="keyword">import</span> <span class="include">io.pivotal.workshop.snippet.domain.Snippet</span>;

  1077. <span class="keyword">import</span> <span class="include">org.springframework.http.MediaType</span>;

  1078. <span class="keyword">import</span> <span class="include">org.springframework.web.bind.annotation.GetMapping</span>;

  1079. <span class="keyword">import</span> <span class="include">org.springframework.web.bind.annotation.RestController</span>;

  1080. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.BodyInserters</span>;

  1081. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.server.ServerRequest</span>;

  1082. <span class="keyword">import</span> <span class="include">org.springframework.web.reactive.function.server.ServerResponse</span>;

  1083. <span class="keyword">import</span> <span class="include">reactor.core.publisher.EmitterProcessor</span>;

  1084. <span class="keyword">import</span> <span class="include">reactor.core.publisher.Flux</span>;

  1085. <span class="keyword">import</span> <span class="include">reactor.core.publisher.Mono</span>;

  1086. 

  1087. <span class="keyword">import</span> <span class="include">static</span> <span class="include">org.springframework.web.reactive.function.server.ServerResponse.ok</span>;

  1088. 

  1089. <span class="annotation">@RestController</span>

  1090. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetController</span> {

  1091. 

  1092.     <span class="directive">private</span> EmitterProcessor snippetStream;

  1093. 

  1094.     <span class="directive">public</span> SnippetController(EmitterProcessor snippetStream) {  <span class="comment">//</span><b class="conum">(1)</b>

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

  1096.     }

  1097. 

  1098.     <span class="annotation">@GetMapping</span>(path = <span class="string"><span class="delimiter">&quot;</span><span class="content">/logs</span><span class="delimiter">&quot;</span></span>, produces = MediaType.TEXT_EVENT_STREAM_VALUE)

  1099.     <span class="directive">public</span> Flux&lt;Snippet&gt; snippetLog(){                          <span class="comment">//</span><b class="conum">(2)</b>

  1100.         <span class="keyword">return</span> snippetStream.doOnSubscribe(subscription -&gt; { snippetStream.next().subscribe(); });

  1101. 

  1102.     }

  1103. }</code></pre>

  1104. </div>

  1105. </div>

  1106. <div class="colist arabic">

  1107. <ol>

  1108. <li>

  1109. <p>The constructor injects the <strong>EmitterProcessor</strong>.</p>

  1110. </li>

  1111. <li>

  1112. <p>This method will handle the stream publish in <strong><em>/logs</em></strong> endpoint. See that it&#8217;s subscribe to the stream.</p>

  1113. </li>

  1114. </ol>

  1115. </div>

  1116. </li>

  1117. <li>

  1118. <p>In the <strong>src/main/resources/application.properties</strong> file add the following properties:</p>

  1119. <div class="listingblock">

  1120. <div class="title">src/main/resources/application.properties</div>

  1121. <div class="content">

  1122. <pre class="CodeRay highlight"><code data-lang="properties">spring.data.mongodb.database=snippets-[YOUR INITIALS]

  1123. spring.data.mongodb.host=[PROVIDED BY THE INSTRUCTOR]

  1124. spring.data.mongodb.port=27017

  1125. spring.data.mongodb.username=[PROVIDED BY THE INSTRUCTOR]

  1126. spring.data.mongodb.password=[PROVIDED BY THE INSTRUCTOR]</code></pre>

  1127. </div>

  1128. </div>

  1129. <div class="paragraph">

  1130. <p><strong>REPLACE</strong> the values accordingly.</p>

  1131. </div>

  1132. </li>

  1133. <li>

  1134. <p>Run the application and go to your browser and hit the <a href="http://localhost:8080/logs" class="bare" target="_blank">http://localhost:8080/logs</a> and browser should be waiting for incoming data.</p>

  1135. </li>

  1136. <li>

  1137. <p>Open a new browser tab or window and point to the <a href="http://localhost:8080/snippets" class="bare" target="_blank">http://localhost:8080/snippets</a> and you will see an empty json collection.</p>

  1138. </li>

  1139. <li>

  1140. <p>Open a Terminal window and add some snippets using the <strong>cUrl</strong> command:</p>

  1141. <div class="listingblock">

  1142. <div class="content">

  1143. <pre class="CodeRay highlight"><code data-lang="bash">curl -i -X POST -H &quot;Content-Type: application/json&quot; -H &quot;Accept: application/json&quot; -d '{&quot;title&quot;:&quot;Hello World&quot;,&quot;code&quot;:&quot;println \&quot;This is awesome\&quot;.upperCase()&quot;,&quot;lang&quot;:{&quot;name&quot;: &quot;Groovy&quot;, &quot;syntax&quot;:&quot;groovy&quot;}}' http://localhost:8080/snippets</code></pre>

  1144. </div>

  1145. </div>

  1146. <div class="admonitionblock tip">

  1147. <table>

  1148. <tr>

  1149. <td class="icon">

  1150. <div class="title">Tip</div>

  1151. </td>

  1152. <td class="content">

  1153. If you are a Windows user, you can use the <strong>POSTMAN</strong> (<a href="https://www.getpostman.com/" class="bare" target="_blank">https://www.getpostman.com/</a>) application to execute the <strong>POST</strong>.

  1154. </td>

  1155. </tr>

  1156. </table>

  1157. </div>

  1158. <div class="paragraph">

  1159. <p>Add more snippets and see how the <a href="http://localhost:8080/logs" class="bare" target="_blank">http://localhost:8080/logs</a> start receiving some Snippet streams.</p>

  1160. </div>

  1161. <div class="paragraph">

  1162. <p><span class="image"><img src="images/11-spring-boot-webflux-02.png" alt="Logs" title="Snippet Logs"></span></p>

  1163. </div>

  1164. </li>

  1165. <li>

  1166. <p>Review the snippets by hitting again the <a href="http://localhost:8080/snippets" class="bare" target="_blank">http://localhost:8080/snippets</a></p>

  1167. <div class="paragraph">

  1168. <p><span class="image"><img src="images/11-spring-boot-webflux-03.png" alt="Snippets" title="Snippets"></span></p>

  1169. </div>

  1170. </li>

  1171. </ol>

  1172. </div>

  1173. <div class="sect2">

  1174. <h3 id="_challenges">Challenges</h3>

  1175. <div class="ulist">

  1176. <ul>

  1177. <li>

  1178. <p>Add an Embedded MongoDB and run the same application. You must add the following dependency to your <strong>pom.xml</strong> or <strong>gradle</strong>:</p>

  1179. <div class="listingblock">

  1180. <div class="title">pom.xml</div>

  1181. <div class="content">

  1182. <pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>

  1183.         <span class="tag">&lt;groupId&gt;</span>de.flapdoodle.embed<span class="tag">&lt;/groupId&gt;</span>

  1184.         <span class="tag">&lt;artifactId&gt;</span>de.flapdoodle.embed.mongo<span class="tag">&lt;/artifactId&gt;</span>

  1185.         <span class="tag">&lt;scope&gt;</span>runtime<span class="tag">&lt;/scope&gt;</span>

  1186. <span class="tag">&lt;/dependency&gt;</span></code></pre>

  1187. </div>

  1188. </div>

  1189. <div class="paragraph">

  1190. <p>or</p>

  1191. </div>

  1192. <div class="listingblock">

  1193. <div class="title">build.gradle</div>

  1194. <div class="content">

  1195. <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>

  1196. </div>

  1197. </div>

  1198. </li>

  1199. </ul>

  1200. </div>

  1201. </div>

  1202. </div>

  1203. </div>

  1204. <div class="sect1">

  1205. <h2 id="_homework">HOMEWORK</h2>

  1206. <div class="sectionbody">

  1207. <div class="ulist">

  1208. <ul>

  1209. <li>

  1210. <p>Use the <strong>annotation-based</strong> <em>WebFlux</em> variant for the <strong>Code Snippet Manager App</strong> for all the endpoints.</p>

  1211. </li>

  1212. </ul>

  1213. </div>

  1214. </div>

  1215. </div>

  1216. </div>

  1217. <div id="footer">

  1218. <div id="footer-text">

  1219. Last updated 2017-11-30 10:36:55 PST

  1220. </div>

  1221. </div>

  1222. </body>

  1223. </html>