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| <h1>Simple Stateless |
| |
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| |
| <blockquote> |
| <p>"Stateless session beans are session beans whose instances have no conversational state. |
| This means that all bean instances are equivalent when they are not involved in servicing |
| a client-invoked method. The term 'stateless' signifies that an instance has no state for a |
| specific client."</p> |
| </blockquote> |
| |
| <p>What this means is quite simply that stateless beans are shared. They do in fact have state |
| as you can assign values to the variables, etc. in the bean instance. The only catch is there |
| are a pool of identical instances and you are not guaranteed to get the exact same instance on |
| every call. For each call, you get whatever instance happens to be available. This is identical |
| to checking out a book from the library or renting a movie from the video store. You are essentially |
| checking out or renting a new bean instance on each method call.</p> |
| |
| <h2>CalculatorBean</h2> |
| |
| <pre><code>package org.superbiz.stateless.basic; |
| |
| import javax.ejb.Stateless; |
| |
| @Stateless |
| public class CalculatorBean { |
| |
| 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>CalculatorTest</h2> |
| |
| <p>Our <code>CalculatorBean</code> can be easily tested using the <code>EJBContainer</code> API in EJB 3.1</p> |
| |
| <pre><code>package org.superbiz.stateless.basic; |
| |
| import org.junit.AfterClass; |
| import org.junit.Before; |
| import org.junit.BeforeClass; |
| import org.junit.Test; |
| |
| import javax.ejb.embeddable.EJBContainer; |
| import javax.naming.NamingException; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| public class CalculatorTest { |
| |
| private static EJBContainer ejbContainer; |
| |
| private CalculatorBean calculator; |
| |
| @BeforeClass |
| public static void startTheContainer() { |
| ejbContainer = EJBContainer.createEJBContainer(); |
| } |
| |
| @Before |
| public void lookupABean() throws NamingException { |
| Object object = ejbContainer.getContext().lookup("java:global/simple-stateless/CalculatorBean"); |
| |
| assertTrue(object instanceof CalculatorBean); |
| |
| calculator = (CalculatorBean) object; |
| } |
| |
| @AfterClass |
| public static void stopTheContainer() { |
| if (ejbContainer != null) { |
| ejbContainer.close(); |
| } |
| } |
| |
| /** |
| * Test Add method |
| */ |
| @Test |
| public void testAdd() { |
| |
| assertEquals(10, calculator.add(4, 6)); |
| |
| } |
| |
| /** |
| * Test Subtract method |
| */ |
| @Test |
| public void testSubtract() { |
| |
| assertEquals(-2, calculator.subtract(4, 6)); |
| |
| } |
| |
| /** |
| * Test Multiply method |
| */ |
| @Test |
| public void testMultiply() { |
| |
| assertEquals(24, calculator.multiply(4, 6)); |
| |
| } |
| |
| /** |
| * Test Divide method |
| */ |
| @Test |
| public void testDivide() { |
| |
| assertEquals(2, calculator.divide(12, 6)); |
| |
| } |
| |
| /** |
| * Test Remainder method |
| */ |
| @Test |
| public void testRemainder() { |
| |
| assertEquals(4, calculator.remainder(46, 6)); |
| |
| } |
| |
| } |
| </code></pre> |
| |
| <h1>Running</h1> |
| |
| <p>Running the example should generate output similar to the following</p> |
| |
| <pre><code>------------------------------------------------------- |
| T E S T S |
| ------------------------------------------------------- |
| Running org.superbiz.stateless.basic.CalculatorTest |
| Infos - ******************************************************************************** |
| Infos - OpenEJB http://tomee.apache.org/ |
| Infos - Startup: Tue Aug 14 13:28:12 CEST 2012 |
| Infos - Copyright 1999-2012 (C) Apache OpenEJB Project, All Rights Reserved. |
| Infos - Version: 4.1.0 |
| Infos - Build date: 20120814 |
| Infos - Build time: 01:06 |
| Infos - ******************************************************************************** |
| Infos - openejb.home = /home/a185558/Development/Apache/openejb-trunk/examples/simple-stateless |
| Infos - openejb.base = /home/a185558/Development/Apache/openejb-trunk/examples/simple-stateless |
| Infos - Created new singletonService org.apache.openejb.cdi.ThreadSingletonServiceImpl@33bb11 |
| Infos - Succeeded in installing singleton service |
| Infos - Using 'javax.ejb.embeddable.EJBContainer=true' |
| Infos - Cannot find the configuration file [conf/openejb.xml]. Will attempt to create one for the beans deployed. |
| Infos - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service) |
| Infos - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager) |
| Infos - Creating TransactionManager(id=Default Transaction Manager) |
| Infos - Creating SecurityService(id=Default Security Service) |
| Infos - Beginning load: /home/a185558/Development/Apache/openejb-trunk/examples/simple-stateless/target/classes |
| Infos - Configuring enterprise application: /home/a185558/Development/Apache/openejb-trunk/examples/simple-stateless |
| Infos - Auto-deploying ejb CalculatorBean: EjbDeployment(deployment-id=CalculatorBean) |
| Infos - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container) |
| Infos - Auto-creating a container for bean CalculatorBean: Container(type=STATELESS, id=Default Stateless Container) |
| Infos - Creating Container(id=Default Stateless Container) |
| Infos - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container) |
| Infos - Auto-creating a container for bean org.superbiz.stateless.basic.CalculatorTest: Container(type=MANAGED, id=Default Managed Container) |
| Infos - Creating Container(id=Default Managed Container) |
| Infos - Using directory /tmp for stateful session passivation |
| Infos - Enterprise application "/home/a185558/Development/Apache/openejb-trunk/examples/simple-stateless" loaded. |
| Infos - Assembling app: /home/a185558/Development/Apache/openejb-trunk/examples/simple-stateless |
| Infos - Jndi(name="java:global/simple-stateless/CalculatorBean!org.superbiz.stateless.basic.CalculatorBean") |
| Infos - Jndi(name="java:global/simple-stateless/CalculatorBean") |
| Infos - Existing thread singleton service in SystemInstance() org.apache.openejb.cdi.ThreadSingletonServiceImpl@33bb11 |
| Infos - OpenWebBeans Container is starting... |
| Infos - Adding OpenWebBeansPlugin : [CdiPlugin] |
| Infos - All injection points are validated successfully. |
| Infos - OpenWebBeans Container has started, it took 135 ms. |
| Infos - Created Ejb(deployment-id=CalculatorBean, ejb-name=CalculatorBean, container=Default Stateless Container) |
| Infos - Started Ejb(deployment-id=CalculatorBean, ejb-name=CalculatorBean, container=Default Stateless Container) |
| Infos - Deployed Application(path=/home/a185558/Development/Apache/openejb-trunk/examples/simple-stateless) |
| Infos - Undeploying app: /home/a185558/Development/Apache/openejb-trunk/examples/simple-stateless |
| Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.068 sec |
| |
| Results : |
| |
| Tests run: 5, Failures: 0, Errors: 0, Skipped: 0 |
| </code></pre> |
| |
| |
| <div class="page-header"> </div> |
| <h4>APIs Used</h4> |
| <ul><li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Stateless.html">javax.ejb.Stateless</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/naming/NamingException.html">javax.naming.NamingException</a></li> |
| </ul> |
| |
| <h3>Source</h3> |
| <ul> |
| <li>Apache <a href="http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/simple-stateless">simple-stateless</a></li> |
| <li>Github <a href="https://github.com/apache/tomee/tree/trunk/examples/simple-stateless">simple-stateless</a></li> |
| </ul> |
| <pre> |
| svn co http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/simple-stateless |
| cd simple-stateless |
| mvn clean install |
| </pre> |
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