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PivotalLabsAndSamples/student-lab-instructions/08-spring-boot-actuator.html

08-spring-boot-actuator.html 49KB
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  207. .exampleblock>.content>:last-child{margin-bottom:0}

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

  574. <div id="header">

  575. <h1><a id="spring-boot-actuator"></a>Spring Boot Actuator</h1>

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

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

  578. <ul class="sectlevel1">

  579. <li><a href="#_code_snippet_manager_actuator">Code Snippet Manager Actuator</a>

  580. <ul class="sectlevel2">

  581. <li><a href="#_spring_boot_actuator_review_endpoints">Spring Boot Actuator: Review Endpoints</a></li>

  582. <li><a href="#_spring_boot_actuator_healthindicator">Spring Boot Actuator: HealthIndicator</a></li>

  583. <li><a href="#_challenges">CHALLENGES</a></li>

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

  585. </ul>

  586. </li>

  587. </ul>

  588. </div>

  589. </div>

  590. <div id="content">

  591. <div id="preamble">

  592. <div class="sectionbody">

  593. <div class="paragraph">

  594. <p>Get familiar with the <strong>Spring Boot Actuator</strong> and its features.</p>

  595. </div>

  596. <div class="paragraph">

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

  598. </div>

  599. <!-- toc disabled -->

  600. </div>

  601. </div>

  602. <div class="sect1">

  603. <h2 id="_code_snippet_manager_actuator">Code Snippet Manager Actuator</h2>

  604. <div class="sectionbody">

  605. <div class="paragraph">

  606. <p>You will continue with the <strong>Code Snippet Manager</strong> code. For this lab you will need the <strong>snippet-code-manager-jpa-rest</strong> project code. You will reuse the code from previous labs.</p>

  607. </div>

  608. <div class="olist arabic">

  609. <ol class="arabic">

  610. <li>

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

  612. </li>

  613. <li>

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

  615. </li>

  616. <li>

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

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

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

  620. <colgroup>

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

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

  623. </colgroup>

  624. <thead>

  625. <tr>

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

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

  628. </tr>

  629. </thead>

  630. <tbody>

  631. <tr>

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

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

  634. </tr>

  635. <tr>

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

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

  638. </tr>

  639. <tr>

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

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

  642. </tr>

  643. <tr>

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

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

  646. </tr>

  647. <tr>

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

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

  650. </tr>

  651. <tr>

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

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

  654. </tr>

  655. </tbody>

  656. </table>

  657. <div class="paragraph">

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

  659. <p><span class="image"><img src="images/08-spring-boot-actuator-01.png" alt="SpringInitializr" title="Spring Initializr"></span></p>

  660. </div>

  661. <div class="admonitionblock tip">

  662. <table>

  663. <tr>

  664. <td class="icon">

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

  666. </td>

  667. <td class="content">

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

  669. </td>

  670. </tr>

  671. </table>

  672. </div>

  673. </li>

  674. <li>

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

  676. </li>

  677. <li>

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

  679. </li>

  680. <li>

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

  682. </li>

  683. <li>

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

  685. </li>

  686. <li>

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

  688. </li>

  689. <li>

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

  691. </li>

  692. </ol>

  693. </div>

  694. <div class="sect2">

  695. <h3 id="_spring_boot_actuator_review_endpoints">Spring Boot Actuator: Review Endpoints</h3>

  696. <div class="olist arabic">

  697. <ol class="arabic">

  698. <li>

  699. <p>In the <strong>src/main/resources/application.properties</strong>:</p>

  700. <div class="ulist">

  701. <ul>

  702. <li>

  703. <p>Enable all the endpoints</p>

  704. </li>

  705. <li>

  706. <p>Change the default path <strong>/actuator</strong>, instead use the path <strong>/admin</strong></p>

  707. <div class="listingblock">

  708. <div class="title">application.properties</div>

  709. <div class="content">

  710. <pre class="CodeRay highlight"><code data-lang="properties">management.endpoints.web.base-path=/admin

  711. management.endpoints.web.expose=*</code></pre>

  712. </div>

  713. </div>

  714. </li>

  715. </ul>

  716. </div>

  717. </li>

  718. <li>

  719. <p>Run the application and make sure all the endpoints are enable. Review all of them.</p>

  720. </li>

  721. </ol>

  722. </div>

  723. </div>

  724. <div class="sect2">

  725. <h3 id="_spring_boot_actuator_healthindicator">Spring Boot Actuator: HealthIndicator</h3>

  726. <div class="paragraph">

  727. <p>Using the same code, imagine that we are going to use a FileSystem to save some information. A specific path, by using the <strong>snippet.path</strong> property. We need to know:</p>

  728. </div>

  729. <div class="ulist">

  730. <ul>

  731. <li>

  732. <p>If the path doesn&#8217;t exists, report <strong><em>out of service</em></strong>.</p>

  733. </li>

  734. <li>

  735. <p>If the path exists but doesn&#8217;t have writing permissions, report <strong>system down</strong>.</p>

  736. </li>

  737. <li>

  738. <p>If the path exists and it has write permissions, report <strong>up</strong>.</p>

  739. </li>

  740. </ul>

  741. </div>

  742. <div class="olist blank">

  743. <ol class="blank">

  744. <li>

  745. <p>Let&#8217;s create a properties holder class. Add the <strong>SnippetProperties</strong> class in the <strong>io.pivotal.workshop.snippet.config</strong> package:</p>

  746. <div class="listingblock">

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

  748. <div class="content">

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

  750. 

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

  752. 

  753. <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>)

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

  755. 

  756.         <span class="directive">private</span> <span class="predefined-type">String</span> path;

  757. 

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

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

  760.         }

  761. 

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

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

  764.         }

  765. 

  766. }</code></pre>

  767. </div>

  768. </div>

  769. <div class="paragraph">

  770. <p>The above code will hold the information about the path with the property: <strong>snippet.path</strong>.</p>

  771. </div>

  772. </li>

  773. <li>

  774. <p>Create the <strong>SnippetHealthCheck</strong> class in the <strong>io.pivotal.workshop.snippet.actuator</strong> package:</p>

  775. <div class="listingblock">

  776. <div class="title">io.pivotal.workshop.snippet.actuator.SnippetHealthCheck.java</div>

  777. <div class="content">

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

  779. 

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

  781. 

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

  783. <span class="keyword">import</span> <span class="include">org.springframework.boot.actuate.health.Health</span>;

  784. <span class="keyword">import</span> <span class="include">org.springframework.boot.actuate.health.HealthIndicator</span>;

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

  786. 

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

  788. <span class="directive">public</span> <span class="type">class</span> <span class="class">SnippetHealthCheck</span> <span class="directive">implements</span> HealthIndicator {

  789. 

  790.         <span class="directive">private</span> <span class="predefined-type">String</span> path;

  791. 

  792.         <span class="directive">public</span> SnippetHealthCheck(<span class="annotation">@Value</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">${snippet.path:/tmp}</span><span class="delimiter">&quot;</span></span>)<span class="predefined-type">String</span> path){

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

  794.         }

  795. 

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

  797.         <span class="directive">public</span> Health health() {

  798. 

  799.                 <span class="keyword">try</span> {

  800. 

  801.                         <span class="predefined-type">File</span> file = <span class="keyword">new</span> <span class="predefined-type">File</span>(path);

  802.                         <span class="keyword">if</span>(file.exists()){

  803. 

  804.                                 <span class="keyword">if</span>(file.canWrite())

  805.                                         <span class="keyword">return</span> Health.up().build();

  806. 

  807.                                 <span class="keyword">return</span> Health.down().build();

  808. 

  809.                         }<span class="keyword">else</span>{

  810.                                 <span class="keyword">return</span> Health.outOfService().build();

  811.                         }

  812.                 }<span class="keyword">catch</span>(<span class="exception">Exception</span> ex) {

  813.                         <span class="keyword">return</span> Health.down(ex).build();

  814.                 }

  815.         }

  816. 

  817. }</code></pre>

  818. </div>

  819. </div>

  820. <div class="paragraph">

  821. <p>Take a look at the constructor. If the <strong>snippet.path</strong> is not found, it will use the <strong>/tmp</strong> as default path.</p>

  822. </div>

  823. </li>

  824. <li>

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

  826. <div class="listingblock">

  827. <div class="content">

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

  829. snippet.path=/tmp/snippets</code></pre>

  830. </div>

  831. </div>

  832. <div class="admonitionblock tip">

  833. <table>

  834. <tr>

  835. <td class="icon">

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

  837. </td>

  838. <td class="content">

  839. Do not create this folder yet, we will make sure our custom health indicator works.

  840. </td>

  841. </tr>

  842. </table>

  843. </div>

  844. <div class="admonitionblock tip">

  845. <table>

  846. <tr>

  847. <td class="icon">

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

  849. </td>

  850. <td class="content">

  851. If you are using Windows try to use the <strong>C:/tmp/snippets</strong> or <strong>C:\\tmp\\snippets</strong> format.

  852. </td>

  853. </tr>

  854. </table>

  855. </div>

  856. </li>

  857. <li>

  858. <p>If you run the application and go to the <a href="http://localhost:8080/admin/health" class="bare" target="_blank">http://localhost:8080/admin/health</a>, you should have something like the following Figure 3.0:</p>

  859. <div class="paragraph">

  860. <div class="title">Figure 3.0: Spring Boot Actuator - <a href="http://localhost:8080/admin/health" class="bare" target="_blank">http://localhost:8080/admin/health</a></div>

  861. <p><span class="image"><img src="images/08-spring-boot-actuator-03.png" alt="Spring Boot Actuator" title="Spring Boot Actuator"></span></p>

  862. </div>

  863. <div class="paragraph">

  864. <p>Here you can see the <strong>SnippetHealthCheck</strong> value: <strong>OUT_OF_SERVICE</strong>.</p>

  865. </div>

  866. </li>

  867. <li>

  868. <p>Create the <strong>/tmp/snippets</strong> (or <strong>C:\tmp\snippets</strong> for Windows) path but add/modify <strong>only read</strong> access, and then you can refresh the page, you should see the same as Figure 4.0:</p>

  869. <div class="paragraph">

  870. <div class="title">Figure 4.0: Spring Boot Actuator - <a href="http://localhost:8080/admin/health" class="bare" target="_blank">http://localhost:8080/admin/health</a></div>

  871. <p><span class="image"><img src="images/08-spring-boot-actuator-04.png" alt="Spring Boot Actuator" title="Spring Boot Actuator"></span></p>

  872. </div>

  873. <div class="paragraph">

  874. <p>Here you can see the <strong>SnippetHealthCheck</strong> value: <strong>DOWN</strong>.</p>

  875. </div>

  876. </li>

  877. <li>

  878. <p>Modify the path to write access and refresh, you should have the following, see Figure 5.0.</p>

  879. <div class="paragraph">

  880. <div class="title">Figure 5.0: Spring Boot Actuator - <a href="http://localhost:8080/admin/health" class="bare" target="_blank">http://localhost:8080/admin/health</a></div>

  881. <p><span class="image"><img src="images/08-spring-boot-actuator-05.png" alt="Spring Boot Actuator" title="Spring Boot Actuator"></span></p>

  882. </div>

  883. <div class="paragraph">

  884. <p>Here you can see the <strong>SnippetHealthCheck</strong> value: <strong>UP</strong>.</p>

  885. </div>

  886. </li>

  887. </ol>

  888. </div>

  889. </div>

  890. <div class="sect2">

  891. <h3 id="_challenges">CHALLENGES</h3>

  892. <div class="olist arabic">

  893. <ol class="arabic">

  894. <li>

  895. <p>Add a graceful shutdown to the application by executing the following command:</p>

  896. <div class="listingblock">

  897. <div class="content">

  898. <pre class="CodeRay highlight"><code data-lang="bash">curl -X POST localhost:8080/admin/shutdown</code></pre>

  899. </div>

  900. </div>

  901. <div class="admonitionblock tip">

  902. <table>

  903. <tr>

  904. <td class="icon">

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

  906. </td>

  907. <td class="content">

  908. 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>.

  909. </td>

  910. </tr>

  911. </table>

  912. </div>

  913. </li>

  914. </ol>

  915. </div>

  916. </div>

  917. <div class="sect2">

  918. <h3 id="_homework">HOMEWORK</h3>

  919. <div class="paragraph">

  920. <p>Review the Micrometer technology (<a href="http://micrometer.io" class="bare" target="_blank">http://micrometer.io</a>) and apply it to the Code Snippet Manager.</p>

  921. </div>

  922. </div>

  923. </div>

  924. </div>

  925. </div>

  926. <div id="footer">

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

  928. Last updated 2017-12-01 09:15:44 PST

  929. </div>

  930. </div>

  931. </body>

  932. </html>