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<h1>CDI @RequestScoped</h1>
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<div class="col-md-12">
<p>This example show the use of <code>@RequestScoped</code> annotation for injected objects. An object which is defined as <code>@RequestScoped</code> is created once for every request and is shared by all the bean that inject it throughout a request.</p>
<h1>Example</h1>
<p>This example depicts a similar scenario to cdi-application-scope. A restaurant guest orders a soup from the waiter. The order is passed to the chef who prepares it and passes it back the waiter who in turn delivers it to the guest.</p>
<h2>Waiter</h2>
<p>The <code>Waiter</code> session bean receives a request from the test class via the <code>orderSoup()</code> method. A <code>Soup</code> insance will be created in this method and will be shared throughout the request with the <code>Chef</code> bean. The method passes the request to the <code>Chef</code> bean. It then returns the name of the soup to the test class. </p>
<pre><code>@Stateless
public class Waiter {
@Inject
private Soup soup;
@EJB
private Chef chef;
public String orderSoup(String name){
soup.setName(name);
return chef.prepareSoup().getName();
}
}
</code></pre>
<h2>Soup</h2>
<p>The <code>Soup</code> class is an injectable POJO, defined as <code>@RequestScoped</code>. This means that an instance will be created only once for every request and will be shared by all the beans injecting it.</p>
<pre><code>@RequestScoped
public class Soup {
private String name = &quot;Soup of the day&quot;;
@PostConstruct
public void afterCreate() {
System.out.println(&quot;Soup created&quot;);
}
public String getName() {
return name;
}
public void setName(String name){
this.name = name;
}
}
</code></pre>
<h2>Chef</h2>
<p>The <code>Chef</code> class is a simple session bean with an injected <code>Soup</code> field. Normally, the soup parameter would be passed as a <code>prepareSoup()</code> argument, but for the need of this example it's passed by the request context. </p>
<pre><code>@Stateless
public class Chef {
@Inject
private Soup soup;
public Soup prepareSoup() {
return soup;
}
}
</code></pre>
<h1>Test Case</h1>
<p>This is the entry class for this example.</p>
<pre><code>public class RestaurantTest {
private static String TOMATO_SOUP = &quot;Tomato Soup&quot;;
private EJBContainer container;
@EJB
private Waiter joe;
@Before
public void startContainer() throws Exception {
container = EJBContainer.createEJBContainer();
container.getContext().bind(&quot;inject&quot;, this);
}
@Test
public void orderSoup(){
String soup = joe.orderSoup(TOMATO_SOUP);
assertEquals(TOMATO_SOUP, soup);
soup = joe.orderSoup(POTATO_SOUP);
assertEquals(POTATO_SOUP, soup);
}
@After
public void closeContainer() throws Exception {
container.close();
}
}
</code></pre>
<h1>Running</h1>
<p>In the output you can see that there were two <code>Soup</code> instances created - one for each request.</p>
<pre><code>-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running org.superbiz.cdi.requestscope.RestaurantTest
Apache OpenEJB 7.0.0-SNAPSHOT build: 20111224-11:09
http://tomee.apache.org/
INFO - openejb.home = C:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope
INFO - openejb.base = C:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope
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: c:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope\target\classes
INFO - Beginning load: c:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope\target\classes
INFO - Configuring enterprise application: c:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope
INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
INFO - Auto-creating a container for bean cdi-request-scope.Comp: Container(type=MANAGED, id=Default Managed Container)
INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
INFO - Auto-creating a container for bean Chef: Container(type=STATELESS, id=Default Stateless Container)
INFO - Enterprise application &quot;c:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope&quot; loaded.
INFO - Assembling app: c:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope
INFO - Jndi(name=&quot;java:global/cdi-request-scope/Chef!org.superbiz.cdi.requestscope.Chef&quot;)
INFO - Jndi(name=&quot;java:global/cdi-request-scope/Chef&quot;)
INFO - Jndi(name=&quot;java:global/cdi-request-scope/Waiter!org.superbiz.cdi.requestscope.Waiter&quot;)
INFO - Jndi(name=&quot;java:global/cdi-request-scope/Waiter&quot;)
INFO - Created Ejb(deployment-id=Chef, ejb-name=Chef, container=Default Stateless Container)
INFO - Created Ejb(deployment-id=Waiter, ejb-name=Waiter, container=Default Stateless Container)
INFO - Started Ejb(deployment-id=Chef, ejb-name=Chef, container=Default Stateless Container)
INFO - Started Ejb(deployment-id=Waiter, ejb-name=Waiter, container=Default Stateless Container)
INFO - Deployed Application(path=c:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope)
Soup created
Soup created
INFO - Undeploying app: c:\Users\Daniel\workspaces\openejb\openejb\examples\cdi-request-scope
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.412 sec
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
</code></pre>
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