latest/pt/examples/singleton-startup-ordering.html - tomee-site-pub - Git at Google

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             <div class='page-header'>

               <h1>Ordem de Inicialização Singleton</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div id="preamble">
 <div class="sectionbody">
 <div class="paragraph">
 <p>Estes exemplos mostram na prática as anotações <code>@Startup</code> e <code>@DependsOn</code> em EJB&#8217;s <code>singleton</code>.</p>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_executando_os_testes">Executando os testes</h3>
 <div class="listingblock">
 <div class="content">
 <pre>mvn clean test</pre>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_o_cenário">O cenário</h3>
 <div class="ulist">
 <ul>
 <li>
 <p>O exemplo é composto por três beans singleton : <code>SingletonA</code>, <code>SingletonB</code>, <code>SingletonC</code>.</p>
 </li>
 <li>
 <p>Os três EJB&#8217;s contém uma anotação <code>@PostConstruct</code> para o método `init`que é executado depois da injeção de dependência estar terminada, para otimizar qualquer inicialização. O método é invocado antes que classe seja colocada no serviço.</p>
 </li>
 <li>
 <p>O método <code>init</code> armazena o nome do classe bean que foi inicializada no bean <code>Supervisor</code>.</p>
 </li>
 <li>
 <p>O bean <code>Supervisor</code> está anotado com <code>@ApplicationScoped</code> para ser capaz de compartilhar a lista de nomes do bean armazenadas no atributo <code>records</code>.</p>
 </li>
 <li>
 <p><code>SingletonA</code> e <code>SingletonB</code> são anotados com <code>@Startup</code> o que siginifica, que eles serão inicializados na inicialização do aplicativo. <code>SingletonC</code> será inicializado, até que o bean seja usado, no ponto de injeção posterior.</p>
 </li>
 <li>
 <p><code>SingletonB</code> é anotado com <code>@DependsOn("SingletonA")</code> para obrigar uma inicialização ordenada com relação ao <code>SingletonA</code>.</p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p><code>SingletonA.java</code>: Singleton EJB anotado com <code>@Startup</code>. Depende do <code>Supervisor</code> EJB.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>package org.foo;

 import javax.annotation.PostConstruct;
 import javax.ejb.Singleton;
 import javax.ejb.Startup;
 import javax.inject.Inject;
 import java.util.logging.Logger;

 @Singleton
 @Startup
 public class SingletonA {

     @Inject
     Supervisor supervisor;

     private final static Logger LOGGER = Logger.getLogger(SingletonA.class.getName());


     @PostConstruct
     public void init() {
         LOGGER.info("Hi from init in class: " + this.getClass().getName());
         supervisor.addRecord(this.getClass().getSimpleName());
     }
 }</pre>
 </div>
 </div>
 <div class="paragraph">
 <p><code>SingletonB.java</code>: Singleton EJB anotado com <code>@Startup</code> e <code>DependsOn</code>. Depende do <code>Supervisor</code> EJB.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>package org.foo;

 import javax.annotation.PostConstruct;
 import javax.ejb.DependsOn;
 import javax.ejb.Singleton;
 import javax.ejb.Startup;
 import javax.inject.Inject;
 import java.util.logging.Logger;

 @Singleton
 @Startup
 @DependsOn("SingletonA")
 public class SingletonB {

     @Inject
     Supervisor supervisor;

     private final static Logger LOGGER = Logger.getLogger(SingletonB.class.getName());

     @PostConstruct
     public void init() {
         LOGGER.info("Hi from init in class: " + this.getClass().getName());
         supervisor.addRecord(this.getClass().getSimpleName());
     }
 }</pre>
 </div>
 </div>
 <div class="paragraph">
 <p><code>SingletonC.java</code>: Singleton EJB. Depende do <code>Supervisor</code> EJB.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>import javax.annotation.PostConstruct;
 import javax.ejb.Singleton;
 import javax.inject.Inject;
 import java.util.logging.Logger;

 @Singleton
 public class SingletonC {
     @Inject
     Supervisor supervisor;

     private final static Logger LOGGER = Logger.getLogger(SingletonC.class.getName());

     @PostConstruct
     public void init() {
         LOGGER.info("Hi from init in class: " + this.getClass().getName());
         supervisor.addRecord(this.getClass().getSimpleName());

     }

     public String hello() {
         return "Hello from SingletonC.class";
     }
 }</pre>
 </div>
 </div>
 <div class="paragraph">
 <p><code>Supervisor.java</code>: Bean com escopo de aplicação que mantém uma lista de Nomes do Bean.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>import javax.enterprise.context.ApplicationScoped;
 import java.util.ArrayList;
 import java.util.List;

 @ApplicationScoped
 public class Supervisor {
     private final List&lt;String&gt; records = new ArrayList&lt;&gt;();

     public void addRecord(String beanClass){
         records.add(beanClass);
     }

     public String getRecord(){
         return records.toString();
     }
 }</pre>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_os_testes">Os testes</h3>
 <div class="ulist">
 <ul>
 <li>
 <p>A classe <code>TestSingletonStartupOrder.java</code> contem dois testes, que são executados em ordem, via a anotação <code>@FixMethodOrder(MethodSorters.NAME_ASCENDING)</code></p>
 </li>
 <li>
 <p><code>primeiroTest</code>: afirmar verdadeiro se e somente, se os registros armazenados no <code>Supervisor.record</code> forem iguais para <code>[SingletonA, SingletonB]</code>. Observe que a ordem também é validada. Neste teste, nós não esperamos ver <code>SingletonC</code> inicializado, uma vez que não está anotado com <code>@Startup</code>.</p>
 </li>
 <li>
 <p><code>segundoTest</code>:  Este teste injeta <code>SingletonC</code> como um parâmetro nos testes, portanto, é afirmado verdadeiro se e somente, se os registros armazenados no <code>Supervisor.record</code> forem iguais para <code>[SingletonA, SingletonB, SingletonC]</code></p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p><code>TestSingletonStartupOrder.java</code></p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>import org.jboss.arquillian.container.test.api.Deployment;
 import org.jboss.arquillian.junit.Arquillian;
 import org.jboss.shrinkwrap.api.ShrinkWrap;
 import org.jboss.shrinkwrap.api.asset.StringAsset;
 import org.jboss.shrinkwrap.api.spec.WebArchive;
 import org.junit.FixMethodOrder;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.MethodSorters;
 import org.foo.SingletonA;
 import org.foo.SingletonB;
 import org.foo.SingletonC;
 import org.foo.Supervisor;

 import java.util.logging.Logger;

 import static junit.framework.TestCase.assertTrue;


 @RunWith(Arquillian.class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
 public class TestSingletonStartupOrder {
     private final static Logger LOGGER = Logger.getLogger(TestSingletonStartupOrder.class.getName());

     @Deployment()
     public static WebArchive createDeployment() {
         final WebArchive webArchive = ShrinkWrap.create(WebArchive.class, "test.war")
                                                 .addClass(SingletonA.class)
                                                 .addClass(SingletonB.class)
                                                 .addClass(SingletonC.class)
                                                 .addClass(Supervisor.class)
                                                 .addAsWebInfResource(new StringAsset("&lt;beans/&gt;"), "beans.xml");
         return webArchive;
     }


     @Test
     public void firstTest(Supervisor supervisor) {
         LOGGER.info("SUPERVISOR: [" + supervisor.getRecord() + "]");
         assertTrue(supervisor.getRecord().equals("[SingletonA, SingletonB]"));
     }

     @Test
     public void secondTest(Supervisor supervisor, SingletonC singletonC) {
         LOGGER.info(singletonC.hello());
         LOGGER.info("SUPERVISOR: [" + supervisor.getRecord() + "]");
         assertTrue(supervisor.getRecord().equals("[SingletonA, SingletonB, SingletonC]"));
     }
 }</pre>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_sobre_a_arquitetura_de_teste">Sobre a arquitetura de Teste</h3>
 <div class="paragraph">
 <p>Os casos de teste deste projeto, estão construidos, usando Arquillian e TomEE
 Remoto. A configuração arquillian pode ser encontrada em
 <code>src/test/resources/arquillian.xml</code></p>
 </div>
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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>Ordem de Inicialização Singleton</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div id="preamble">
	<div class="sectionbody">
	<div class="paragraph">
	<p>Estes exemplos mostram na prática as anotações <code>@Startup</code> e <code>@DependsOn</code> em EJB’s <code>singleton</code>.</p>
	</div>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_executando_os_testes">Executando os testes</h3>
	<div class="listingblock">
	<div class="content">
	<pre>mvn clean test</pre>
	</div>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_o_cenário">O cenário</h3>
	<div class="ulist">
	<ul>
	<li>
	<p>O exemplo é composto por três beans singleton : <code>SingletonA</code>, <code>SingletonB</code>, <code>SingletonC</code>.</p>
	</li>
	<li>
	<p>Os três EJB’s contém uma anotação <code>@PostConstruct</code> para o método `init`que é executado depois da injeção de dependência estar terminada, para otimizar qualquer inicialização. O método é invocado antes que classe seja colocada no serviço.</p>
	</li>
	<li>
	<p>O método <code>init</code> armazena o nome do classe bean que foi inicializada no bean <code>Supervisor</code>.</p>
	</li>
	<li>
	<p>O bean <code>Supervisor</code> está anotado com <code>@ApplicationScoped</code> para ser capaz de compartilhar a lista de nomes do bean armazenadas no atributo <code>records</code>.</p>
	</li>
	<li>
	<p><code>SingletonA</code> e <code>SingletonB</code> são anotados com <code>@Startup</code> o que siginifica, que eles serão inicializados na inicialização do aplicativo. <code>SingletonC</code> será inicializado, até que o bean seja usado, no ponto de injeção posterior.</p>
	</li>
	<li>
	<p><code>SingletonB</code> é anotado com <code>@DependsOn("SingletonA")</code> para obrigar uma inicialização ordenada com relação ao <code>SingletonA</code>.</p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p><code>SingletonA.java</code>: Singleton EJB anotado com <code>@Startup</code>. Depende do <code>Supervisor</code> EJB.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>package org.foo;

	import javax.annotation.PostConstruct;
	import javax.ejb.Singleton;
	import javax.ejb.Startup;
	import javax.inject.Inject;
	import java.util.logging.Logger;

	@Singleton
	@Startup
	public class SingletonA {

	@Inject
	Supervisor supervisor;

	private final static Logger LOGGER = Logger.getLogger(SingletonA.class.getName());


	@PostConstruct
	public void init() {
	LOGGER.info("Hi from init in class: " + this.getClass().getName());
	supervisor.addRecord(this.getClass().getSimpleName());
	}
	}</pre>
	</div>
	</div>
	<div class="paragraph">
	<p><code>SingletonB.java</code>: Singleton EJB anotado com <code>@Startup</code> e <code>DependsOn</code>. Depende do <code>Supervisor</code> EJB.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>package org.foo;

	import javax.annotation.PostConstruct;
	import javax.ejb.DependsOn;
	import javax.ejb.Singleton;
	import javax.ejb.Startup;
	import javax.inject.Inject;
	import java.util.logging.Logger;

	@Singleton
	@Startup
	@DependsOn("SingletonA")
	public class SingletonB {

	@Inject
	Supervisor supervisor;

	private final static Logger LOGGER = Logger.getLogger(SingletonB.class.getName());

	@PostConstruct
	public void init() {
	LOGGER.info("Hi from init in class: " + this.getClass().getName());
	supervisor.addRecord(this.getClass().getSimpleName());
	}
	}</pre>
	</div>
	</div>
	<div class="paragraph">
	<p><code>SingletonC.java</code>: Singleton EJB. Depende do <code>Supervisor</code> EJB.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>import javax.annotation.PostConstruct;
	import javax.ejb.Singleton;
	import javax.inject.Inject;
	import java.util.logging.Logger;

	@Singleton
	public class SingletonC {
	@Inject
	Supervisor supervisor;

	private final static Logger LOGGER = Logger.getLogger(SingletonC.class.getName());

	@PostConstruct
	public void init() {
	LOGGER.info("Hi from init in class: " + this.getClass().getName());
	supervisor.addRecord(this.getClass().getSimpleName());

	}

	public String hello() {
	return "Hello from SingletonC.class";
	}
	}</pre>
	</div>
	</div>
	<div class="paragraph">
	<p><code>Supervisor.java</code>: Bean com escopo de aplicação que mantém uma lista de Nomes do Bean.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>import javax.enterprise.context.ApplicationScoped;
	import java.util.ArrayList;
	import java.util.List;

	@ApplicationScoped
	public class Supervisor {
	private final List<String> records = new ArrayList<>();

	public void addRecord(String beanClass){
	records.add(beanClass);
	}

	public String getRecord(){
	return records.toString();
	}
	}</pre>
	</div>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_os_testes">Os testes</h3>
	<div class="ulist">
	<ul>
	<li>
	<p>A classe <code>TestSingletonStartupOrder.java</code> contem dois testes, que são executados em ordem, via a anotação <code>@FixMethodOrder(MethodSorters.NAME_ASCENDING)</code></p>
	</li>
	<li>
	<p><code>primeiroTest</code>: afirmar verdadeiro se e somente, se os registros armazenados no <code>Supervisor.record</code> forem iguais para <code>[SingletonA, SingletonB]</code>. Observe que a ordem também é validada. Neste teste, nós não esperamos ver <code>SingletonC</code> inicializado, uma vez que não está anotado com <code>@Startup</code>.</p>
	</li>
	<li>
	<p><code>segundoTest</code>: Este teste injeta <code>SingletonC</code> como um parâmetro nos testes, portanto, é afirmado verdadeiro se e somente, se os registros armazenados no <code>Supervisor.record</code> forem iguais para <code>[SingletonA, SingletonB, SingletonC]</code></p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p><code>TestSingletonStartupOrder.java</code></p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>import org.jboss.arquillian.container.test.api.Deployment;
	import org.jboss.arquillian.junit.Arquillian;
	import org.jboss.shrinkwrap.api.ShrinkWrap;
	import org.jboss.shrinkwrap.api.asset.StringAsset;
	import org.jboss.shrinkwrap.api.spec.WebArchive;
	import org.junit.FixMethodOrder;
	import org.junit.Test;
	import org.junit.runner.RunWith;
	import org.junit.runners.MethodSorters;
	import org.foo.SingletonA;
	import org.foo.SingletonB;
	import org.foo.SingletonC;
	import org.foo.Supervisor;

	import java.util.logging.Logger;

	import static junit.framework.TestCase.assertTrue;


	@RunWith(Arquillian.class)
	@FixMethodOrder(MethodSorters.NAME_ASCENDING)
	public class TestSingletonStartupOrder {
	private final static Logger LOGGER = Logger.getLogger(TestSingletonStartupOrder.class.getName());

	@Deployment()
	public static WebArchive createDeployment() {
	final WebArchive webArchive = ShrinkWrap.create(WebArchive.class, "test.war")
	.addClass(SingletonA.class)
	.addClass(SingletonB.class)
	.addClass(SingletonC.class)
	.addClass(Supervisor.class)
	.addAsWebInfResource(new StringAsset("<beans/>"), "beans.xml");
	return webArchive;
	}


	@Test
	public void firstTest(Supervisor supervisor) {
	LOGGER.info("SUPERVISOR: [" + supervisor.getRecord() + "]");
	assertTrue(supervisor.getRecord().equals("[SingletonA, SingletonB]"));
	}

	@Test
	public void secondTest(Supervisor supervisor, SingletonC singletonC) {
	LOGGER.info(singletonC.hello());
	LOGGER.info("SUPERVISOR: [" + supervisor.getRecord() + "]");
	assertTrue(supervisor.getRecord().equals("[SingletonA, SingletonB, SingletonC]"));
	}
	}</pre>
	</div>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_sobre_a_arquitetura_de_teste">Sobre a arquitetura de Teste</h3>
	<div class="paragraph">
	<p>Os casos de teste deste projeto, estão construidos, usando Arquillian e TomEE
	Remoto. A configuração arquillian pode ser encontrada em
	<code>src/test/resources/arquillian.xml</code></p>
	</div>
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