tomee-7.0/examples/simple-stateless-callbacks.html - tomee-site-pub - Git at Google

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               <h1>Simple Stateless with callback methods</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <p>This example shows how to create a stateless session bean that uses the @PostConstruct, @PreDestroy and @AroundInvoke annotations.</p>
 <h2>CalculatorBean</h2>
 <pre><code>package org.superbiz.stateless.basic;

 import javax.annotation.PostConstruct;
 import javax.annotation.PreDestroy;
 import javax.ejb.Stateless;
 import javax.interceptor.AroundInvoke;
 import javax.interceptor.InvocationContext;

 @Stateless
 public class CalculatorBean {

     @PostConstruct
     public void postConstruct() {
         ExecutionChannel.getInstance().notifyObservers(&quot;postConstruct&quot;);
     }

     @PreDestroy
     public void preDestroy() {
         ExecutionChannel.getInstance().notifyObservers(&quot;preDestroy&quot;);
     }

     @AroundInvoke
     public Object intercept(InvocationContext ctx) throws Exception {
         ExecutionChannel.getInstance().notifyObservers(ctx.getMethod().getName());
         return ctx.proceed();
     }

     public int add(int a, int b) {
         return a + b;
     }

     public int subtract(int a, int b) {
         return a - b;
     }

     public int multiply(int a, int b) {
         return a * b;
     }

     public int divide(int a, int b) {
         return a / b;
     }

     public int remainder(int a, int b) {
         return a % b;
     }

 }
 </code></pre>
 <h2>ExecutionChannel</h2>
 <pre><code>package org.superbiz.counter;

 import java.util.ArrayList;
 import java.util.List;

 public class ExecutionChannel {
     private static final ExecutionChannel INSTANCE = new ExecutionChannel();

     private final List&lt;ExecutionObserver&gt; observers = new ArrayList&lt;ExecutionObserver&gt;();

     public static ExecutionChannel getInstance() {
         return INSTANCE;
     }

     public void addObserver(ExecutionObserver observer) {
         this.observers.add(observer);
     }

     public void notifyObservers(Object value) {
         for (ExecutionObserver observer : this.observers) {
             observer.onExecution(value);
         }
     }
 }
 </code></pre>
 <h2>ExecutionObserver</h2>
 <pre><code>package org.superbiz.counter;

 public interface ExecutionObserver {

     void onExecution(Object value);

 }
 </code></pre>
 <h2>CalculatorTest</h2>
 <pre><code>package org.superbiz.stateless.basic;

 import org.junit.Assert;
 import org.junit.Test;

 import javax.ejb.embeddable.EJBContainer;
 import javax.naming.Context;
 import javax.naming.InitialContext;
 import javax.naming.NamingException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Properties;

 public class CalculatorTest implements ExecutionObserver {
     private static final String JNDI = &quot;java:global/simple-stateless-callbacks/CalculatorBean&quot;;

     private List&lt;Object&gt; received = new ArrayList&lt;Object&gt;();

     public Context getContext() throws NamingException {
         final Properties p = new Properties();
         p.put(Context.INITIAL_CONTEXT_FACTORY, &quot;org.apache.openejb.core.LocalInitialContextFactory&quot;);
         return new InitialContext(p);

     }

     @Test
     public void test() throws Exception {
         ExecutionChannel.getInstance().addObserver(this);

         final EJBContainer container = EJBContainer.createEJBContainer();

         {
             final CalculatorBean calculator = (CalculatorBean) getContext().lookup(JNDI);

             Assert.assertEquals(10, calculator.add(4, 6));

             //the bean is constructed only when it is used for the first time
             Assert.assertEquals(&quot;postConstruct&quot;, this.received.remove(0));
             Assert.assertEquals(&quot;add&quot;, this.received.remove(0));

             Assert.assertEquals(-2, calculator.subtract(4, 6));
             Assert.assertEquals(&quot;subtract&quot;, this.received.remove(0));

             Assert.assertEquals(24, calculator.multiply(4, 6));
             Assert.assertEquals(&quot;multiply&quot;, this.received.remove(0));

             Assert.assertEquals(2, calculator.divide(12, 6));
             Assert.assertEquals(&quot;divide&quot;, this.received.remove(0));

             Assert.assertEquals(4, calculator.remainder(46, 6));
             Assert.assertEquals(&quot;remainder&quot;, this.received.remove(0));
         }

         {
             final CalculatorBean calculator = (CalculatorBean) getContext().lookup(JNDI);

             Assert.assertEquals(10, calculator.add(4, 6));
             Assert.assertEquals(&quot;add&quot;, this.received.remove(0));

         }

         container.close();
         Assert.assertEquals(&quot;preDestroy&quot;, this.received.remove(0));
         Assert.assertTrue(this.received.isEmpty());
     }

     @Override
     public void onExecution(Object value) {
         System.out.println(&quot;Test step -&gt; &quot; + value);
         this.received.add(value);
     }
 }
 </code></pre>
 <h1>Running</h1>
 <pre><code>-------------------------------------------------------
  T E S T S
 -------------------------------------------------------
 Running org.superbiz.stateless.basic.CalculatorTest
 INFO - ********************************************************************************
 INFO - OpenEJB http://tomee.apache.org/
 INFO - Startup: Sat Jul 21 09:23:38 EDT 2012
 INFO - Copyright 1999-2012 (C) Apache OpenEJB Project, All Rights Reserved.
 INFO - Version: 4.1.0
 INFO - Build date: 20120721
 INFO - Build time: 04:06
 INFO - ********************************************************************************
 INFO - openejb.home = /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
 INFO - openejb.base = /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
 INFO - Created new singletonService org.apache.openejb.cdi.ThreadSingletonServiceImpl@527736bd
 INFO - Succeeded in installing singleton service
 INFO - Using &#39;javax.ejb.embeddable.EJBContainer=true&#39;
 INFO - Cannot find the configuration file [conf/openejb.xml].  Will attempt to create one for the beans deployed.
 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 - Creating TransactionManager(id=Default Transaction Manager)
 INFO - Creating SecurityService(id=Default Security Service)
 INFO - Beginning load: /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks/target/classes
 INFO - Configuring enterprise application: /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
 INFO - Auto-deploying ejb CalculatorBean: EjbDeployment(deployment-id=CalculatorBean)
 INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
 INFO - Auto-creating a container for bean CalculatorBean: Container(type=STATELESS, id=Default Stateless Container)
 INFO - Creating Container(id=Default Stateless Container)
 INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
 INFO - Auto-creating a container for bean org.superbiz.stateless.basic.CalculatorTest: Container(type=MANAGED, id=Default Managed Container)
 INFO - Creating Container(id=Default Managed Container)
 INFO - Using directory /tmp for stateful session passivation
 INFO - Enterprise application &quot;/home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks&quot; loaded.
 INFO - Assembling app: /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
 INFO - Jndi(name=&quot;java:global/simple-stateless-callbacks/CalculatorBean!org.superbiz.stateless.basic.CalculatorBean&quot;)
 INFO - Jndi(name=&quot;java:global/simple-stateless-callbacks/CalculatorBean&quot;)
 INFO - Existing thread singleton service in SystemInstance() org.apache.openejb.cdi.ThreadSingletonServiceImpl@527736bd
 INFO - OpenWebBeans Container is starting...
 INFO - Adding OpenWebBeansPlugin : [CdiPlugin]
 INFO - All injection points are validated successfully.
 INFO - OpenWebBeans Container has started, it took 111 ms.
 INFO - Created Ejb(deployment-id=CalculatorBean, ejb-name=CalculatorBean, container=Default Stateless Container)
 INFO - Started Ejb(deployment-id=CalculatorBean, ejb-name=CalculatorBean, container=Default Stateless Container)
 INFO - Deployed Application(path=/home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks)
 Test step -&gt; postConstruct
 Test step -&gt; add
 Test step -&gt; subtract
 Test step -&gt; multiply
 Test step -&gt; divide
 Test step -&gt; remainder
 Test step -&gt; add
 INFO - Undeploying app: /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
 Test step -&gt; preDestroy
 Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.884 sec

 Results :

 Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
 </code></pre>
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	<div id="main-block" class="container main-block">
	<div class="row title">
	<div class="col-md-12">
	<div class='page-header'>

	<h1>Simple Stateless with callback methods</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<p>This example shows how to create a stateless session bean that uses the @PostConstruct, @PreDestroy and @AroundInvoke annotations.</p>
	<h2>CalculatorBean</h2>
	<pre><code>package org.superbiz.stateless.basic;

	import javax.annotation.PostConstruct;
	import javax.annotation.PreDestroy;
	import javax.ejb.Stateless;
	import javax.interceptor.AroundInvoke;
	import javax.interceptor.InvocationContext;

	@Stateless
	public class CalculatorBean {

	@PostConstruct
	public void postConstruct() {
	ExecutionChannel.getInstance().notifyObservers("postConstruct");
	}

	@PreDestroy
	public void preDestroy() {
	ExecutionChannel.getInstance().notifyObservers("preDestroy");
	}

	@AroundInvoke
	public Object intercept(InvocationContext ctx) throws Exception {
	ExecutionChannel.getInstance().notifyObservers(ctx.getMethod().getName());
	return ctx.proceed();
	}

	public int add(int a, int b) {
	return a + b;
	}

	public int subtract(int a, int b) {
	return a - b;
	}

	public int multiply(int a, int b) {
	return a * b;
	}

	public int divide(int a, int b) {
	return a / b;
	}

	public int remainder(int a, int b) {
	return a % b;
	}

	}
	</code></pre>
	<h2>ExecutionChannel</h2>
	<pre><code>package org.superbiz.counter;

	import java.util.ArrayList;
	import java.util.List;

	public class ExecutionChannel {
	private static final ExecutionChannel INSTANCE = new ExecutionChannel();

	private final List<ExecutionObserver> observers = new ArrayList<ExecutionObserver>();

	public static ExecutionChannel getInstance() {
	return INSTANCE;
	}

	public void addObserver(ExecutionObserver observer) {
	this.observers.add(observer);
	}

	public void notifyObservers(Object value) {
	for (ExecutionObserver observer : this.observers) {
	observer.onExecution(value);
	}
	}
	}
	</code></pre>
	<h2>ExecutionObserver</h2>
	<pre><code>package org.superbiz.counter;

	public interface ExecutionObserver {

	void onExecution(Object value);

	}
	</code></pre>
	<h2>CalculatorTest</h2>
	<pre><code>package org.superbiz.stateless.basic;

	import org.junit.Assert;
	import org.junit.Test;

	import javax.ejb.embeddable.EJBContainer;
	import javax.naming.Context;
	import javax.naming.InitialContext;
	import javax.naming.NamingException;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Properties;

	public class CalculatorTest implements ExecutionObserver {
	private static final String JNDI = "java:global/simple-stateless-callbacks/CalculatorBean";

	private List<Object> received = new ArrayList<Object>();

	public Context getContext() throws NamingException {
	final Properties p = new Properties();
	p.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.core.LocalInitialContextFactory");
	return new InitialContext(p);

	}

	@Test
	public void test() throws Exception {
	ExecutionChannel.getInstance().addObserver(this);

	final EJBContainer container = EJBContainer.createEJBContainer();

	{
	final CalculatorBean calculator = (CalculatorBean) getContext().lookup(JNDI);

	Assert.assertEquals(10, calculator.add(4, 6));

	//the bean is constructed only when it is used for the first time
	Assert.assertEquals("postConstruct", this.received.remove(0));
	Assert.assertEquals("add", this.received.remove(0));

	Assert.assertEquals(-2, calculator.subtract(4, 6));
	Assert.assertEquals("subtract", this.received.remove(0));

	Assert.assertEquals(24, calculator.multiply(4, 6));
	Assert.assertEquals("multiply", this.received.remove(0));

	Assert.assertEquals(2, calculator.divide(12, 6));
	Assert.assertEquals("divide", this.received.remove(0));

	Assert.assertEquals(4, calculator.remainder(46, 6));
	Assert.assertEquals("remainder", this.received.remove(0));
	}

	{
	final CalculatorBean calculator = (CalculatorBean) getContext().lookup(JNDI);

	Assert.assertEquals(10, calculator.add(4, 6));
	Assert.assertEquals("add", this.received.remove(0));

	}

	container.close();
	Assert.assertEquals("preDestroy", this.received.remove(0));
	Assert.assertTrue(this.received.isEmpty());
	}

	@Override
	public void onExecution(Object value) {
	System.out.println("Test step -> " + value);
	this.received.add(value);
	}
	}
	</code></pre>
	<h1>Running</h1>
	<pre><code>-------------------------------------------------------
	T E S T S
	-------------------------------------------------------
	Running org.superbiz.stateless.basic.CalculatorTest
	INFO - ********************************************************************************
	INFO - OpenEJB http://tomee.apache.org/
	INFO - Startup: Sat Jul 21 09:23:38 EDT 2012
	INFO - Copyright 1999-2012 (C) Apache OpenEJB Project, All Rights Reserved.
	INFO - Version: 4.1.0
	INFO - Build date: 20120721
	INFO - Build time: 04:06
	INFO - ********************************************************************************
	INFO - openejb.home = /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
	INFO - openejb.base = /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
	INFO - Created new singletonService org.apache.openejb.cdi.ThreadSingletonServiceImpl@527736bd
	INFO - Succeeded in installing singleton service
	INFO - Using 'javax.ejb.embeddable.EJBContainer=true'
	INFO - Cannot find the configuration file [conf/openejb.xml]. Will attempt to create one for the beans deployed.
	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 - Creating TransactionManager(id=Default Transaction Manager)
	INFO - Creating SecurityService(id=Default Security Service)
	INFO - Beginning load: /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks/target/classes
	INFO - Configuring enterprise application: /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
	INFO - Auto-deploying ejb CalculatorBean: EjbDeployment(deployment-id=CalculatorBean)
	INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
	INFO - Auto-creating a container for bean CalculatorBean: Container(type=STATELESS, id=Default Stateless Container)
	INFO - Creating Container(id=Default Stateless Container)
	INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
	INFO - Auto-creating a container for bean org.superbiz.stateless.basic.CalculatorTest: Container(type=MANAGED, id=Default Managed Container)
	INFO - Creating Container(id=Default Managed Container)
	INFO - Using directory /tmp for stateful session passivation
	INFO - Enterprise application "/home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks" loaded.
	INFO - Assembling app: /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
	INFO - Jndi(name="java:global/simple-stateless-callbacks/CalculatorBean!org.superbiz.stateless.basic.CalculatorBean")
	INFO - Jndi(name="java:global/simple-stateless-callbacks/CalculatorBean")
	INFO - Existing thread singleton service in SystemInstance() org.apache.openejb.cdi.ThreadSingletonServiceImpl@527736bd
	INFO - OpenWebBeans Container is starting...
	INFO - Adding OpenWebBeansPlugin : [CdiPlugin]
	INFO - All injection points are validated successfully.
	INFO - OpenWebBeans Container has started, it took 111 ms.
	INFO - Created Ejb(deployment-id=CalculatorBean, ejb-name=CalculatorBean, container=Default Stateless Container)
	INFO - Started Ejb(deployment-id=CalculatorBean, ejb-name=CalculatorBean, container=Default Stateless Container)
	INFO - Deployed Application(path=/home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks)
	Test step -> postConstruct
	Test step -> add
	Test step -> subtract
	Test step -> multiply
	Test step -> divide
	Test step -> remainder
	Test step -> add
	INFO - Undeploying app: /home/boto/dev/ws/openejb_trunk/openejb/examples/simple-stateless-callbacks
	Test step -> preDestroy
	Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.884 sec

	Results :

	Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
	</code></pre>
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