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<h1>null</h1>
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<h1>Simple CDI Interceptor</h1>
<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>
<p>(Relevant snippets are inlined but you can check out the complete code, from the links provided)</p>
<p>How do we mark which methods are to be intercepted ? Wouldn't it be handy to annotate a method like </p>
<pre><code>@Log
public void aMethod(){...}
</code></pre>
<p>Let's create an annotation that would "mark" a method for interception. </p>
<pre><code>@InterceptorBinding
@Target({ TYPE, METHOD })
@Retention(RUNTIME)
public @interface Log {
}
</code></pre>
<p>Sure, you haven't missed the @InterceptorBinding 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>
<p>So here's our logging interceptor. An @AroundInvoke method and we are almost done.</p>
<pre><code>@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(&quot;Entering method: &quot; + ctx.getMethod().getName());
//or logger.info statement
return ctx.proceed();
}
}
</code></pre>
<p>Now the @Log annotation we created is bound to this interceptor.</p>
<p>That done, let's annotate at class-level or method-level and have fun intercepting ! </p>
<pre><code>@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(&quot;12 Angry Men&quot;);
moviesAvailable.add(&quot;Kings speech&quot;);
return moviesAvailable;
}
public Integer getDiscountedPrice(int ticketPrice) {
return ticketPrice - 50;
}
// assume more methods are present
}
</code></pre>
<p>The <code>@Log</code> annotation applied at class level denotes that all the methods should be intercepted with <code>LoggingInterceptor</code>.</p>
<p>Before we say "all done" there's one last thing we are left with ! To enable the interceptors ! </p>
<p>Lets quickly put up a [beans.xml file]</p>
<pre><code>&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>
<p>in META-INF</p>
<p>Those lines in beans.xml 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>
<p>Fire up the test, and we should see a 'Entering method: getMoviesList' printed in the console.</p>
<h1>Tests</h1>
<pre><code>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 &#39;javax.ejb.embeddable.EJBContainer=true&#39;
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 &quot;/media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors&quot; loaded.
INFO - Assembling app: /media/fthree/Workspace/open4/openejb/examples/cdi-simple-interceptors
INFO - Jndi(name=&quot;java:global/cdi-simple-interceptors/BookShow!org.superbiz.cdi.bookshow.beans.BookShow&quot;)
INFO - Jndi(name=&quot;java:global/cdi-simple-interceptors/BookShow&quot;)
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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