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<h1>Injeção de Ejbs</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Este exemplo mostra como usar a anotação <code>@EJB</code> em uma classe bean para referenciar outros beans.</p>
</div>
<div class="paragraph">
<p>Essa funcionalidade é geralmente chamada de injeção de dependência (consulte
<a href="http://www.martinfowler.com/articles/injection.html" class="bare">http://www.martinfowler.com/articles/injection.html</a>) e foi
recentemente introduzido no Java EE 5.</p>
</div>
<div class="paragraph">
<p>Neste exemplo em particular, nós vamos criar dois bean de sessão sem estado</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Um DataStore session bean</p>
</li>
<li>
<p>Um DataReader session bean</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>O bean DataReader usa o DataStore para recuperar algumas informações e veremos como, dentro do bean DataReader, obter uma referência ao bean DataStore usando a anotação <code>@EJB</code>, evitando assim o uso da API JNDI.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_datareader">DataReader</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection;
import jakarta.ejb.EJB;
import jakarta.ejb.Stateless;
/**
* Este é um bean de sessão sem estado pojo do estilo EJB 3.1
* Toda implementação de bean de sessão sem estado deve ser anotada
* usando a anotação @Stateless
* Este EJB possui 2 interfaces de negócios: DataReaderRemote, um negócio remoto
* interface e DataReaderLocal, uma interface de negócios local
* &lt;p/&gt;
* As variáveis de instância 'dataStoreRemote' são anotadas com a anotação @EJB:
 * isso significa que o servidor de aplicativos, em tempo de execução, injetará nesta instância
 * variável uma referência ao EJB DataStoreRemote
* &lt;p/&gt;
* As variáveis de instância 'dataStoreLocal' são anotadas com a anotação @EJB:
 * isso significa que o servidor de aplicativos, em tempo de execução, injetará nesta instância
 * variável uma referência ao EJB DataStoreLocal
*/
@Stateless
public class DataReader {
@EJB
private DataStoreRemote dataStoreRemote;
@EJB
private DataStoreLocal dataStoreLocal;
@EJB
private DataStore dataStore;
public String readDataFromLocalStore() {
return "LOCAL:" + dataStoreLocal.getData();
}
public String readDataFromLocalBeanStore() {
return "LOCALBEAN:" + dataStore.getData();
}
public String readDataFromRemoteStore() {
return "REMOTE:" + dataStoreRemote.getData();
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_datastore">DataStore</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection;
import jakarta.ejb.LocalBean;
import jakarta.ejb.Stateless;
/**
* Este é um bean de sessão sem estado pojo do estilo EJB 3
 * Toda implementação de bean de sessão sem estado deve ser anotada
 * usando a anotação @Stateless
 * Este EJB possui 2 interfaces de negócios: DataStoreRemote, um negócio remoto
 * interface e DataStoreLocal, uma interface de negócios local
*/
@Stateless
@LocalBean
public class DataStore implements DataStoreLocal, DataStoreRemote {
public String getData() {
return "42";
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_datastorelocal">DataStoreLocal</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection;
import jakarta.ejb.Local;
/**
* Essa é uma interface de negócios local do EJB 3
 * Uma interface comercial local pode ser anotada com o @Local
 * anotação, mas é opcional. Uma interface de negócios que é
 * não anotado com @Local ou @Remote é assumido como Local
 */
@Local
public interface DataStoreLocal {
public String getData();
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_datastoreremote">DataStoreRemote</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection;
import jakarta.ejb.Remote;
/**
 * Esta é uma interface de negócios remota EJB 3
 * Uma interface comercial remota deve ser anotada com a anotação @Remote
 */
@Remote
public interface DataStoreRemote {
public String getData();
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ejbdependencytest">EjbDependencyTest</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection;
import junit.framework.TestCase;
import jakarta.ejb.embeddable.EJBContainer;
import javax.naming.Context;
/**
* Um caso de teste para DataReaderImpl ejb, testando a interface remota e local
*/
public class EjbDependencyTest extends TestCase {
public void test() throws Exception {
final Context context = EJBContainer.createEJBContainer().getContext();
DataReader dataReader = (DataReader) context.lookup("java:global/injection-of-ejbs/DataReader");
assertNotNull(dataReader);
assertEquals("LOCAL:42", dataReader.readDataFromLocalStore());
assertEquals("REMOTE:42", dataReader.readDataFromRemoteStore());
assertEquals("LOCALBEAN:42", dataReader.readDataFromLocalBeanStore());
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_executando">Executando</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-console" data-lang="console">-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running org.superbiz.injection.EjbDependencyTest
Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06
http://tomee.apache.org/
INFO - openejb.home = /Users/dblevins/examples/injection-of-ejbs
INFO - openejb.base = /Users/dblevins/examples/injection-of-ejbs
INFO - Using 'jakarta.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: /Users/dblevins/examples/injection-of-ejbs/target/classes
INFO - Beginning load: /Users/dblevins/examples/injection-of-ejbs/target/classes
INFO - Configuring enterprise application: /Users/dblevins/examples/injection-of-ejbs
INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
INFO - Auto-creating a container for bean DataReader: Container(type=STATELESS, 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.injection.EjbDependencyTest: Container(type=MANAGED, id=Default Managed Container)
INFO - Enterprise application "/Users/dblevins/examples/injection-of-ejbs" loaded.
INFO - Assembling app: /Users/dblevins/examples/injection-of-ejbs
INFO - Jndi(name="java:global/injection-of-ejbs/DataReader!org.superbiz.injection.DataReader")
INFO - Jndi(name="java:global/injection-of-ejbs/DataReader")
INFO - Jndi(name="java:global/injection-of-ejbs/DataStore!org.superbiz.injection.DataStore")
INFO - Jndi(name="java:global/injection-of-ejbs/DataStore!org.superbiz.injection.DataStoreLocal")
INFO - Jndi(name="java:global/injection-of-ejbs/DataStore!org.superbiz.injection.DataStoreRemote")
INFO - Jndi(name="java:global/injection-of-ejbs/DataStore")
INFO - Jndi(name="java:global/EjbModule355598874/org.superbiz.injection.EjbDependencyTest!org.superbiz.injection.EjbDependencyTest")
INFO - Jndi(name="java:global/EjbModule355598874/org.superbiz.injection.EjbDependencyTest")
INFO - Created Ejb(deployment-id=DataReader, ejb-name=DataReader, container=Default Stateless Container)
INFO - Created Ejb(deployment-id=DataStore, ejb-name=DataStore, container=Default Stateless Container)
INFO - Created Ejb(deployment-id=org.superbiz.injection.EjbDependencyTest, ejb-name=org.superbiz.injection.EjbDependencyTest, container=Default Managed Container)
INFO - Started Ejb(deployment-id=DataReader, ejb-name=DataReader, container=Default Stateless Container)
INFO - Started Ejb(deployment-id=DataStore, ejb-name=DataStore, container=Default Stateless Container)
INFO - Started Ejb(deployment-id=org.superbiz.injection.EjbDependencyTest, ejb-name=org.superbiz.injection.EjbDependencyTest, container=Default Managed Container)
INFO - Deployed Application(path=/Users/dblevins/examples/injection-of-ejbs)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.225 sec
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0</code></pre>
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