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<title>Lab 10 - Leveraging Spring Cloud Connectors for Service Binding</title>
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</head>
<body class="article">
<div id="header">
<h1>Lab 10 - Leveraging Spring Cloud Connectors for Service Binding</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>In this lab we’ll bind our RESTful web service from <a href="../lab_09/lab_09.html">Lab 9</a> to a MySQL database and leverage Spring Cloud Connectors to easily connect to it.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The completed code for this lab can be found at <code>$COURSE_HOME/day_01/session_03/lab_10/complete/cities</code>.
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_using_spring_cloud_connectors">Using Spring Cloud Connectors</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Change to the lab directory (the initial state for this lab is the same as the completed state for <a href="../lab_09/lab_09.html">Lab 9</a>, so you can choose to continue with that project if you like):</p>
<div class="listingblock">
<div class="content">
<pre>$ cd $COURSE_HOME/day_01/session_03/lab_10/initial/cities</pre>
</div>
</div>
</li>
<li>
<p>At present we’re still using the in-memory database. Let’s connect to a MySQL database service.
From the CLI, let’s <em>create</em> a MySQL service instance:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">$ cf cs p-mysql 100mb-dev cities-db
Creating service cities-db...
OK</code></pre>
</div>
</div>
</li>
<li>
<p>Next add the service to your application manifest, which will <em>bind</em> the service to our application on the next push. We’ll also add an environment variable to switch on the “cloud” profile,</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-yml" data-lang="yml">---
applications:
- name: cities
memory: 512M
instances: 1
path: build/libs/cities-0.0.1-SNAPSHOT.jar
timeout: 180
services: # Add
- cities-db # these
env: # four
SPRING_PROFILES_ACTIVE: cloud # lines</code></pre>
</div>
</div>
<div class="paragraph">
<p>You can also accomplish the service binding by explicitly binding the service at the command-line:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">$ cf bind-service cities cities-db
Binding service cities-db to app cities...
OK</code></pre>
</div>
</div>
</li>
<li>
<p>Next we’ll add Spring Cloud and MySQL dependencies to our Gradle build. Comment or remove the <code>hsqldb</code> line add add the following in the <code>dependencies</code> section:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-groovy" data-lang="groovy">dependencies {
// ....
compile("org.springframework.cloud:spring-cloud-spring-service-connector:1.1.0.RELEASE")
compile("org.springframework.cloud:spring-cloud-cloudfoundry-connector:1.1.0.RELEASE")
runtime("'org.mariadb.jdbc:mariadb-java-client:1.1.7'
")
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Since we’ve added new dependencies, re-run <code>./gradlew idea</code> or <code>./gradlew eclipse</code> to have them added to the IDE classpath.</p>
</div>
</li>
<li>
<p>Next, let’s create the package <code>org.example.cities.config</code> and create in that package the class <code>CloudDataSourceConfig</code>. Add the following code:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Profile("cloud")
@Configuration
public class CloudDataSourceConfig extends AbstractCloudConfig {
@Bean
public DataSource dataSource() {
return connectionFactory().dataSource();
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>As before, have the IDE import the appropriate dependencies.</p>
</div>
<div class="paragraph">
<p>The <code>@Profile</code> annotation will cause this class (which becomes Spring configuration when annotated as <code>@Configuration</code>) to be added to the configuration set because of the <code>SPRING_PROFILES_ACTIVE</code> environment variable we added earlier. You can still run the application locally (with the default profile) using the embedded database.</p>
</div>
<div class="paragraph">
<p>With this code, Spring Cloud will detect a bound service that is compatible with <code>DataSource</code>, read the credentials, and then create a <code>DataSource</code> as appropriate (it will throw an exception otherwise).</p>
</div>
</li>
<li>
<p>Add the following to <code>src/main/resources/application.properties</code> to cause Hibernate to create the database schema and import data at startup. This is done automatically for embedded databases, not for custom <code>DataSource</code>s. Other Hibernate native properties can be set in a similar fashion:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">spring.jpa.hibernate.ddl-auto=create</code></pre>
</div>
</div>
</li>
<li>
<p>Build the application:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">$ ./gradlew assemble</code></pre>
</div>
</div>
</li>
<li>
<p>Re-push the application:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">$ cf push</code></pre>
</div>
</div>
</li>
<li>
<p>Take a look at the <code>env</code> endpoint again to see the service bound in <code>VCAP_SERVICES</code>:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">$ curl http://cities-colorado-contemplator.nyc.fe.gopivotal.com/env
...
"VCAP_SERVICES":"{\"p-mysql\":[{\"name\":\"cities-db\",\"label\":\"p-mysql\",\"tags\":[\"mysql\",\"relational\"],\"plan\":\"100mb-dev\",\"credentials\":{\"hostname\":\"10.68.106.85\",\"port\":3306,\"name\":\"cf_7a5601f9_32e3_41e1_b523_ed5ca96418f5\",\"username\":\"Vm2Z9D848eagt4rq\",\"password\":\"JgstkF06p2SOTlZg\",\"uri\":\"mysql://Vm2Z9D848eagt4rq:[email protected]:3306/cf_7a5601f9_32e3_41e1_b523_ed5ca96418f5?reconnect=true\",\"jdbcUrl\":\"jdbc:mysql://10.68.106.85:3306/cf_7a5601f9_32e3_41e1_b523_ed5ca96418f5?user=Vm2Z9D848eagt4rq&password=JgstkF06p2SOTlZg\"}}]}",
...</code></pre>
</div>
</div>
<div class="paragraph">
<p>The application is now running against a MySQL database.</p>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_customizing_the_code_datasource_code">Customizing the <code>DataSource</code></h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>You can customize the database connection that Spring Cloud creates with a few lines of code. Change the <code>dataSource</code> method in <code>CloudDataSourceConfig</code> to add some pooling and connection configuration:</p>
<div class="listingblock">
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<pre class="highlight"><code class="language-java" data-lang="java">@Bean
public DataSource dataSource() {
PooledServiceConnectorConfig.PoolConfig poolConfig =
new PooledServiceConnectorConfig.PoolConfig(5, 200);
DataSourceConfig.ConnectionConfig connectionConfig =
new DataSourceConfig.ConnectionConfig("characterEncoding=UTF-8");
DataSourceConfig serviceConfig = new DataSourceConfig(poolConfig, connectionConfig);
return connectionFactory().dataSource("cities-db", serviceConfig);
}</code></pre>
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<p>Build the application:</p>
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<pre class="highlight"><code class="language-bash" data-lang="bash">$ ./gradlew assemble</code></pre>
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<p>Re-push the application:</p>
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<pre class="highlight"><code class="language-bash" data-lang="bash">$ cf push</code></pre>
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Last updated 2015-06-14 20:19:26 EDT
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