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<h1>CDI Interceptor Simples</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div class="paragraph">
<p>Vamos escrever uma aplicação simples que nos permite comprar entradas para um
filme. Como toda aplicação, log é uma das questões transversais que temos.</p>
</div>
<div class="paragraph">
<p>(Trechos relevantes de código vão estar presentes neste tutorial, mas você pode
ver o código completo em nosso repositório no <a href="https://github.com/apache/tomee/tree/master/examples/simple-cdi-interceptor">GitHub</a>)</p>
</div>
<div class="paragraph">
<p>Como nós podemos marcar quais métodos serão interceptados?
Não seria interessante
poder anotar o método desta forma?</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>Vamos criar uma anotação que "marca" nosso método para interceptação.</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>Tenha certeza que você não esqueceu da anotação <code>@InterceptorBinding</code> acima!
Agora que nossa anotação customizada foi criada, vamos anexa-la (ou "vincula-la")
a um interceptador.</p>
</div>
<div class="paragraph">
<p>Aqui está nosso interceptador de log. Um método <code>@AroundInvoke</code> e estamos quase
terminando.</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>Agora a anotação <code>@Log</code> que criamos está vinculada a este interceptador.</p>
</div>
<div class="paragraph">
<p>Tudo pronto, vamos anotar em nível de classe ou método e nos divertir interceptando !</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>A anotação <code>@Log</code> aplicada em nível de classe diz que todos os métodos desta
classe devem ser interceptados pelo <code>LoggingInterceptor</code>.</p>
</div>
<div class="paragraph">
<p>Antes de dizermos "tudo pronto" temos que fazer uma última coisa! Habilitar
os interceptadores!</p>
</div>
<div class="paragraph">
<p>Vamos criar rapidamente um arquivo <code>beans.xml</code> na pasta <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>Essas linhas em <code>beans.xml</code> não apenas "habilitam" os interceptadores, mas também
definem sua "ordem de execução". Mas veremos isso em outro exemplo multiple-cdi-interceptors.</p>
</div>
<div class="paragraph">
<p>Execute o teste, e veremos um <code>Entering method: getMovieList</code> impresso no terminal.</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 - ConfiguringService(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
INFO - ConfiguringService(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=DefaultStateful 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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