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<h1>Simple CDI Interceptor</h1>
</div>
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<div class="col-md-12">
<div class="paragraph">
<p>Let’s write a simple application that would allow us to book tickets for
a movie show. As with all applications, logging is one cross-cutting
concern that we have.</p>
</div>
<div class="paragraph">
<p>(Relevant snippets are inlined but you can check out the complete code,
from the links provided)</p>
</div>
<div class="paragraph">
<p>How do we mark which methods are to be intercepted ? Wouldn’t it be
handy to annotate a method like</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Log
public void aMethod(){...}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Let’s create an annotation that would "mark" a method for
interception.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@InterceptorBinding
@Target({ TYPE, METHOD })
@Retention(RUNTIME)
public @interface Log {
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Sure, you haven’t missed the <code>@InterceptorBinding</code> annotation above ! Now
that our custom annotation is created, lets attach it (or to use a
better term for it, "bind it" ) to an interceptor.</p>
</div>
<div class="paragraph">
<p>So here’s our logging interceptor. An <code>@AroundInvoke</code> method and we are
almost done.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Interceptor
@Log //binding the interceptor here. now any method annotated with @Log would be intercepted by logMethodEntry
public class LoggingInterceptor {
@AroundInvoke
public Object logMethodEntry(InvocationContext ctx) throws Exception {
System.out.println("Entering method: " + ctx.getMethod().getName());
//or logger.info statement
return ctx.proceed();
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Now the <code>@Log</code> annotation we created is bound to this interceptor.</p>
</div>
<div class="paragraph">
<p>That done, let’s annotate at class-level or method-level and have fun
intercepting !</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Log
@Stateful
public class BookShow implements Serializable {
private static final long serialVersionUID = 6350400892234496909L;
public List&lt;String&gt; getMoviesList() {
List&lt;String&gt; moviesAvailable = new ArrayList&lt;String&gt;();
moviesAvailable.add("12 Angry Men");
moviesAvailable.add("Kings speech");
return moviesAvailable;
}
public Integer getDiscountedPrice(int ticketPrice) {
return ticketPrice - 50;
}
// assume more methods are present
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>@Log</code> annotation applied at class level denotes that all the
methods should be intercepted with <code>LoggingInterceptor</code>.</p>
</div>
<div class="paragraph">
<p>Before we say "all done" there’s one last thing we are left with ! To
enable the interceptors !</p>
</div>
<div class="paragraph">
<p>Lets quickly put up a <code>beans.xml</code> file in <code>META-INF</code></p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;beans&gt;
&lt;interceptors&gt;
&lt;class&gt;org.superbiz.cdi.bookshow.interceptors.LoggingInterceptor
&lt;/class&gt;
&lt;/interceptors&gt;
&lt;/beans&gt;</code></pre>
</div>
</div>
<div class="paragraph">
<p>Those lines in <code>beans.xml</code> not only "enable" the interceptors, but also
define the "order of execution" of the interceptors. But we’ll see
that in another example on multiple-cdi-interceptors.</p>
</div>
<div class="paragraph">
<p>Fire up the test, and we should see a <code>Entering method: getMoviesList</code>
printed in the console.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">#Tests Apache OpenEJB 4.0.0-beta-2 build: 20111103-01:00
http://tomee.apache.org/ INFO - openejb.home =
/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors
INFO - openejb.base =
/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors
INFO - Using `javax.ejb.embeddable.EJBContainer=true' INFO - Configuring
Service(id=Default Security Service, type=SecurityService,
provider-id=Default Security Service) INFO - Configuring
Service(id=Default Transaction Manager, type=TransactionManager,
provider-id=Default Transaction Manager) INFO - Found EjbModule in
classpath:
/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors/target/classes
INFO - Beginning load:
/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors/target/classes
INFO - Configuring enterprise application:
/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors
INFO - Configuring Service(id=Default Managed Container, type=Container,
provider-id=Default Managed Container) INFO - Auto-creating a container
for bean cdi-simple-interceptors.Comp: Container(type=MANAGED,
id=Default Managed Container) INFO - Configuring Service(id=Default
Stateful Container, type=Container, provider-id=Default Stateful
Container) INFO - Auto-creating a container for bean BookShow:
Container(type=STATEFUL, id=Default Stateful Container) INFO -
Enterprise application
``/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors''
loaded. INFO - Assembling app:
/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors
INFO -
Jndi(name=``java:global/cdi-simple-interceptors/BookShow!org.superbiz.cdi.bookshow.beans.BookShow'')
INFO - Jndi(name=``java:global/cdi-simple-interceptors/BookShow'') INFO
- Created Ejb(deployment-id=BookShow, ejb-name=BookShow,
container=Default Stateful Container) INFO - Started
Ejb(deployment-id=BookShow, ejb-name=BookShow, container=Default
Stateful Container) INFO - Deployed
Application(path=/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors)
Entering method: getMoviesList</code></pre>
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