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     <div id="main-block" class="container main-block">
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             <div class='page-header'>

               <h1>Agendamento de Eventos CDI</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div id="preamble">
 <div class="sectionbody">
 <div class="paragraph">
 <p>Este exemplo utiliza uma boa combinação CDI/EJB para agendar Eventos CDI. Isto é util se você quiser Eventos CDI para disparar regularmente ou em um horário específico ou data do calendário.</p>
 </div>
 <div class="paragraph">
 <p>Efetivamente este é um simples empacotador em volta do método <code>BeanManager.fireEvent(Object,Annotations...)</code> que adiciona <code>ScheduleExpression</code> na mistura.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_timeout_e_scheduleexpression">@Timeout e ScheduleExpression</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>A lógica aqui é simples, nós efetivamente expômos um método identico para <code>BeanManager.fireEvent(Object, Annotations...)</code> e empacotamos isso como <code>scheduleEvent(ScheduleExpression, Object, Annotation...)</code></p>
 </div>
 <div class="paragraph">
 <p>Para fazer isso nós usamos o <code>TimerService</code> EJB (embaixo dessa cobertura isso é Quartz) e criamos um método <code>@Timeout</code> que vai ser executado quando ativada a <code>ScheduleExpression</code>.</p>
 </div>
 <div class="paragraph">
 <p>O método <code>@Timeout</code>, simplesmente chamado <code>timeout</code>, pega o evento e dispara ele.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">@Singleton
 @Lock(LockType.READ)
 public class Scheduler {

     @Resource
     private TimerService timerService;

     @Resource
     private BeanManager beanManager;

     public void scheduleEvent(ScheduleExpression schedule, Object event, Annotation... qualifiers) {

         timerService.createCalendarTimer(schedule, new TimerConfig(new EventConfig(event, qualifiers), false));
     }

     @Timeout
     private void timeout(Timer timer) {
         final EventConfig config = (EventConfig) timer.getInfo();

         beanManager.fireEvent(config.getEvent(), config.getQualifiers());
     }

     //Na verdade não precisa ser serializável, só tem que implementá-lo
     private final class EventConfig implements Serializable {

         private final Object event;
         private final Annotation[] qualifiers;

         private EventConfig(Object event, Annotation[] qualifiers) {
             this.event = event;
             this.qualifiers = qualifiers;
         }

         public Object getEvent() {
             return event;
         }

         public Annotation[] getQualifiers() {
             return qualifiers;
         }
     }
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>Então para usar isto, temos de injetar <code>Scheduler</code> como um EJB e aproveitar.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">public class SomeBean {

     @EJB
     private Scheduler scheduler;

     public void doit() throws Exception {

         // a cada cinco minutos
         final ScheduleExpression schedule = new ScheduleExpression()
                 .hour("*")
                 .minute("*")
                 .second("*/5");

         scheduler.scheduleEvent(schedule, new TestEvent("five"));
     }

     /**
      * Evento será disparado a cada cinco minutos
      */
     public void observe(@Observes TestEvent event) {
         // process the event
     }

 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_caso_de_teste">Caso de Teste</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Um caso de teste de trabalho para o acima seria como segue:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;

 import jakarta.ejb.AccessTimeout;
 import jakarta.ejb.EJB;
 import jakarta.ejb.ScheduleExpression;
 import jakarta.ejb.embeddable.EJBContainer;
 import jakarta.enterprise.event.Observes;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;

 /**
  * @version $Revision$ $Date$
  */
 public class SchedulerTest {

     public static final CountDownLatch events = new CountDownLatch(3);

     @EJB
     private Scheduler scheduler;

     @Test
     public void test() throws Exception {

         final ScheduleExpression schedule = new ScheduleExpression()
                 .hour("*")
                 .minute("*")
                 .second("*/5");

         scheduler.scheduleEvent(schedule, new TestEvent("five"));

         Assert.assertTrue(events.await(1, TimeUnit.MINUTES));
     }


     @AccessTimeout(value = 1, unit = TimeUnit.MINUTES)
     public void observe(@Observes TestEvent event) {
         if ("five".equals(event.getMessage())) {
             events.countDown();
         }
     }

     public static class TestEvent {
         private final String message;

         public TestEvent(String message) {
             this.message = message;
         }

         public String getMessage() {
             return message;
         }
     }

     @Before
     public void setup() throws Exception {
         EJBContainer.createEJBContainer().getContext().bind("inject", this);
     }
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_você_deve_conhecer">Você deve conhecer</h2>
 <div class="sectionbody">
 <div class="ulist">
 <ul>
 <li>
 <p>Eventos CDI não são mutli-tarefas</p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p>Se houver 0 observadores e cada um deles levar 7 minutos para executar, então o tempo total de execução para um evento são 70 minutos. Ele iria fazer você absolutamente, não gostar de agendar este evento, para disparar frequentemente com mais que 70 minutos.</p>
 </div>
 <div class="paragraph">
 <p>O que aconteceria se você fizesse ? Depende da política <code>@Singleton</code> <code>@Lock</code></p>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p><code>@Lock(WRITE)</code> é o padrão. Neste modo o método <code>timeout</code> seria essencialemnte bloqueado até que a invocação anterior se complete. Tendo ele disparado a cada 5 minutos, mesmo que você só possa processar um a cada 70 minutos, eventualmente faria com que todas as tarefas agrupadas de temporizador estivessem esperando em seu Singleton.</p>
 </li>
 <li>
 <p><code>@Lock(READ)</code> pemitir a execução paralela do método <code>timeout</code>. Eventos serão disparados em paralelo por um tempo. Contudo, desde que eles estejam levando 70 minutos cada, dentro de uma hora mais ou menos, ficaremos sem tarefas agrupadas de temporizador exatamente como acima.</p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p>A solução elegante é usar <code>@Lock(WRITE)</code> então especifique algum tempo limite curto como <code>@AccessTimeout(value = 1, unit = TimeUnit.MINUTES)</code> no método <code>timeout</code>. Quando a próxima invocação de 5 minutos for disparada, ela aguardará até 1 minuto para ter acesso ao Singleton antes de desistir.
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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>Agendamento de Eventos CDI</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div id="preamble">
	<div class="sectionbody">
	<div class="paragraph">
	<p>Este exemplo utiliza uma boa combinação CDI/EJB para agendar Eventos CDI. Isto é util se você quiser Eventos CDI para disparar regularmente ou em um horário específico ou data do calendário.</p>
	</div>
	<div class="paragraph">
	<p>Efetivamente este é um simples empacotador em volta do método <code>BeanManager.fireEvent(Object,Annotations...)</code> que adiciona <code>ScheduleExpression</code> na mistura.</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_timeout_e_scheduleexpression">@Timeout e ScheduleExpression</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>A lógica aqui é simples, nós efetivamente expômos um método identico para <code>BeanManager.fireEvent(Object, Annotations...)</code> e empacotamos isso como <code>scheduleEvent(ScheduleExpression, Object, Annotation...)</code></p>
	</div>
	<div class="paragraph">
	<p>Para fazer isso nós usamos o <code>TimerService</code> EJB (embaixo dessa cobertura isso é Quartz) e criamos um método <code>@Timeout</code> que vai ser executado quando ativada a <code>ScheduleExpression</code>.</p>
	</div>
	<div class="paragraph">
	<p>O método <code>@Timeout</code>, simplesmente chamado <code>timeout</code>, pega o evento e dispara ele.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">@Singleton
	@Lock(LockType.READ)
	public class Scheduler {

	@Resource
	private TimerService timerService;

	@Resource
	private BeanManager beanManager;

	public void scheduleEvent(ScheduleExpression schedule, Object event, Annotation... qualifiers) {

	timerService.createCalendarTimer(schedule, new TimerConfig(new EventConfig(event, qualifiers), false));
	}

	@Timeout
	private void timeout(Timer timer) {
	final EventConfig config = (EventConfig) timer.getInfo();

	beanManager.fireEvent(config.getEvent(), config.getQualifiers());
	}

	//Na verdade não precisa ser serializável, só tem que implementá-lo
	private final class EventConfig implements Serializable {

	private final Object event;
	private final Annotation[] qualifiers;

	private EventConfig(Object event, Annotation[] qualifiers) {
	this.event = event;
	this.qualifiers = qualifiers;
	}

	public Object getEvent() {
	return event;
	}

	public Annotation[] getQualifiers() {
	return qualifiers;
	}
	}
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Então para usar isto, temos de injetar <code>Scheduler</code> como um EJB e aproveitar.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">public class SomeBean {

	@EJB
	private Scheduler scheduler;

	public void doit() throws Exception {

	// a cada cinco minutos
	final ScheduleExpression schedule = new ScheduleExpression()
	.hour("*")
	.minute("*")
	.second("*/5");

	scheduler.scheduleEvent(schedule, new TestEvent("five"));
	}

	/**
	* Evento será disparado a cada cinco minutos
	*/
	public void observe(@Observes TestEvent event) {
	// process the event
	}

	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_caso_de_teste">Caso de Teste</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>Um caso de teste de trabalho para o acima seria como segue:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">import org.junit.Assert;
	import org.junit.Before;
	import org.junit.Test;

	import jakarta.ejb.AccessTimeout;
	import jakarta.ejb.EJB;
	import jakarta.ejb.ScheduleExpression;
	import jakarta.ejb.embeddable.EJBContainer;
	import jakarta.enterprise.event.Observes;
	import java.util.concurrent.CountDownLatch;
	import java.util.concurrent.TimeUnit;

	/**
	* @version $Revision$ $Date$
	*/
	public class SchedulerTest {

	public static final CountDownLatch events = new CountDownLatch(3);

	@EJB
	private Scheduler scheduler;

	@Test
	public void test() throws Exception {

	final ScheduleExpression schedule = new ScheduleExpression()
	.hour("*")
	.minute("*")
	.second("*/5");

	scheduler.scheduleEvent(schedule, new TestEvent("five"));

	Assert.assertTrue(events.await(1, TimeUnit.MINUTES));
	}


	@AccessTimeout(value = 1, unit = TimeUnit.MINUTES)
	public void observe(@Observes TestEvent event) {
	if ("five".equals(event.getMessage())) {
	events.countDown();
	}
	}

	public static class TestEvent {
	private final String message;

	public TestEvent(String message) {
	this.message = message;
	}

	public String getMessage() {
	return message;
	}
	}

	@Before
	public void setup() throws Exception {
	EJBContainer.createEJBContainer().getContext().bind("inject", this);
	}
	}</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_você_deve_conhecer">Você deve conhecer</h2>
	<div class="sectionbody">
	<div class="ulist">
	<ul>
	<li>
	<p>Eventos CDI não são mutli-tarefas</p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p>Se houver 0 observadores e cada um deles levar 7 minutos para executar, então o tempo total de execução para um evento são 70 minutos. Ele iria fazer você absolutamente, não gostar de agendar este evento, para disparar frequentemente com mais que 70 minutos.</p>
	</div>
	<div class="paragraph">
	<p>O que aconteceria se você fizesse ? Depende da política <code>@Singleton</code> <code>@Lock</code></p>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p><code>@Lock(WRITE)</code> é o padrão. Neste modo o método <code>timeout</code> seria essencialemnte bloqueado até que a invocação anterior se complete. Tendo ele disparado a cada 5 minutos, mesmo que você só possa processar um a cada 70 minutos, eventualmente faria com que todas as tarefas agrupadas de temporizador estivessem esperando em seu Singleton.</p>
	</li>
	<li>
	<p><code>@Lock(READ)</code> pemitir a execução paralela do método <code>timeout</code>. Eventos serão disparados em paralelo por um tempo. Contudo, desde que eles estejam levando 70 minutos cada, dentro de uma hora mais ou menos, ficaremos sem tarefas agrupadas de temporizador exatamente como acima.</p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p>A solução elegante é usar <code>@Lock(WRITE)</code> então especifique algum tempo limite curto como <code>@AccessTimeout(value = 1, unit = TimeUnit.MINUTES)</code> no método <code>timeout</code>. Quando a próxima invocação de 5 minutos for disparada, ela aguardará até 1 minuto para ter acesso ao Singleton antes de desistir.
	== APIs Used</p>
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	<div class="ulist">
	<ul>
	<li>
	<p><a href="../../../jakartaee-10.0/javadoc/jakarta/annotation/Resource.html">jakarta.annotation.Resource</a></p>
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