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         <small><a href="./../../index.html">Home</a>&nbsp;&raquo&nbsp;<a href="./../../examples/">Examples</a>&nbsp;&raquo&nbsp;<a href="./../../examples/simple-cdi-interceptor/">Simple Cdi Interceptor</a></small><br>
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 &nbsp;
 <div class="page-header">
 <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("Entering method: " + 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("12 Angry Men");
         moviesAvailable.add("Kings speech");
         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://openejb.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>


 <div class="page-header">&nbsp;</div>
 <h4>APIs Used</h4>
 <ul><li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJB.html">javax.ejb.EJB</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Stateful.html">javax.ejb.Stateful</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/embeddable/EJBContainer.html">javax.ejb.embeddable.EJBContainer</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/interceptor/AroundInvoke.html">javax.interceptor.AroundInvoke</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/interceptor/Interceptor.html">javax.interceptor.Interceptor</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/interceptor/InterceptorBinding.html">javax.interceptor.InterceptorBinding</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/interceptor/InvocationContext.html">javax.interceptor.InvocationContext</a></li>
 </ul>

 <h3>Source</h3>
   <ul>
       <li>Apache <a href="http://svn.apache.org/repos/asf/tomee/tomee//examples/simple-cdi-interceptor">simple-cdi-interceptor</a></li>
       <li>Github <a href="https://github.com/apache/tomee/tree//examples/simple-cdi-interceptor">simple-cdi-interceptor</a></li>
   </ul>
 <pre>
 svn co http://svn.apache.org/repos/asf/tomee/tomee//examples/simple-cdi-interceptor
 cd simple-cdi-interceptor
 mvn clean install
 </pre>


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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("Entering method: " + 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<String> getMoviesList() {
	List<String> moviesAvailable = new ArrayList<String>();
	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>

	<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><beans>
	<interceptors>
	<class>org.superbiz.cdi.bookshow.interceptors.LoggingInterceptor
	</class>
	</interceptors>
	</beans>
	</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://openejb.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>


	<div class="page-header"> </div>
	<h4>APIs Used</h4>
	<ul><li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJB.html">javax.ejb.EJB</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Stateful.html">javax.ejb.Stateful</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/embeddable/EJBContainer.html">javax.ejb.embeddable.EJBContainer</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/interceptor/AroundInvoke.html">javax.interceptor.AroundInvoke</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/interceptor/Interceptor.html">javax.interceptor.Interceptor</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/interceptor/InterceptorBinding.html">javax.interceptor.InterceptorBinding</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/interceptor/InvocationContext.html">javax.interceptor.InvocationContext</a></li>
	</ul>

	<h3>Source</h3>
	<ul>
	<li>Apache <a href="http://svn.apache.org/repos/asf/tomee/tomee//examples/simple-cdi-interceptor">simple-cdi-interceptor</a></li>
	<li>Github <a href="https://github.com/apache/tomee/tree//examples/simple-cdi-interceptor">simple-cdi-interceptor</a></li>
	</ul>
	<pre>
	svn co http://svn.apache.org/repos/asf/tomee/tomee//examples/simple-cdi-interceptor
	cd simple-cdi-interceptor
	mvn clean install
	</pre>


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