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<h1>Schedule Expression (Cronograma Expressão)</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Neste exemplo, exercitamos o <code>TimerService</code>.</p>
</div>
<div class="quoteblock">
<blockquote>
<div class="paragraph">
<p>``A interface TimerService fornece componentes de bean corporativo com
acesso ao serviço de cronômetro fornecido pelo contêiner. O EJB Timer Service permite que os beans de entidade, os beans de sessão sem estado e os beans controlados por mensagem sejam registrados para eventos de retorno de chamada do cronômetro em um tempo especificado, após um tempo decorrido especificado ou após um intervalo especificado.''</p>
</div>
</blockquote>
</div>
<div class="paragraph">
<p>Para uma descrição completa do TimerService, consulte o tutorial Java EE dedicado ao
<a href="http://docs.oracle.com/javaee/6/tutorial/doc/bnboy.html">Timer Service</a>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_farmerbrown">FarmerBrown</h2>
<div class="sectionbody">
<div class="paragraph">
<p>No <code>PostConstruct</code>, criamos 5 temporizadores programáticos. Provavelmente, os quatro primeiros não serão acionados durante a execução do teste; no entanto, o último terá o tempo limite esgotado algumas vezes.</p>
</div>
<div class="paragraph">
<p>Cada cronômetro contém um atributo de informação, que pode ser inspecionado no tempo limite.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.corn;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.Resource;
import jakarta.ejb.Lock;
import jakarta.ejb.LockType;
import jakarta.ejb.ScheduleExpression;
import jakarta.ejb.Singleton;
import jakarta.ejb.Startup;
import jakarta.ejb.Timeout;
import jakarta.ejb.Timer;
import jakarta.ejb.TimerConfig;
import jakarta.ejb.TimerService;
import java.util.concurrent.atomic.AtomicInteger;
/**
* É aqui que programamos todos os trabalhos de milho do fazendeiro Brown(FarmerBrown)
*
* @version $Revision$ $Date$
*/
@Singleton
@Lock(LockType.READ) // permite que os temporizadores sejam executados em paralelo
@Startup
public class FarmerBrown {
private final AtomicInteger checks = new AtomicInteger();
@Resource
private TimerService timerService;
@PostConstruct
private void construct() {
final TimerConfig plantTheCorn = new TimerConfig("plantTheCorn", false);
timerService.createCalendarTimer(new ScheduleExpression().month(5).dayOfMonth("20-Last").minute(0).hour(8), plantTheCorn);
timerService.createCalendarTimer(new ScheduleExpression().month(6).dayOfMonth("1-10").minute(0).hour(8), plantTheCorn);
final TimerConfig harvestTheCorn = new TimerConfig("harvestTheCorn", false);
timerService.createCalendarTimer(new ScheduleExpression().month(9).dayOfMonth("20-Last").minute(0).hour(8), harvestTheCorn);
timerService.createCalendarTimer(new ScheduleExpression().month(10).dayOfMonth("1-10").minute(0).hour(8), harvestTheCorn);
final TimerConfig checkOnTheDaughters = new TimerConfig("checkOnTheDaughters", false);
timerService.createCalendarTimer(new ScheduleExpression().second("*").minute("*").hour("*"), checkOnTheDaughters);
}
@Timeout
public void timeout(Timer timer) {
if ("plantTheCorn".equals(timer.getInfo())) {
plantTheCorn();
} else if ("harvestTheCorn".equals(timer.getInfo())) {
harvestTheCorn();
} else if ("checkOnTheDaughters".equals(timer.getInfo())) {
checkOnTheDaughters();
}
}
private void plantTheCorn() {
// Escave o plantador !!!
}
private void harvestTheCorn() {
// Desenterre a colheitadeira !!!
}
private void checkOnTheDaughters() {
checks.incrementAndGet();
}
public int getChecks() {
return checks.get();
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_farmerbrowntest">FarmerBrownTest</h2>
<div class="sectionbody">
<div class="paragraph">
<p>A classe de teste adquire uma instância do contexto e espera por 5
segundos para dar aos temporizadores uma chance de expirar.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.corn;
import junit.framework.TestCase;
import jakarta.ejb.embeddable.EJBContainer;
import javax.naming.Context;
import static java.util.concurrent.TimeUnit.SECONDS;
/**
* @version $Revision$ $Date$
*/
public class FarmerBrownTest extends TestCase {
public void test() throws Exception {
final Context context = EJBContainer.createEJBContainer().getContext();
final FarmerBrown farmerBrown = (FarmerBrown) context.lookup("java:global/schedule-expression/FarmerBrown");
// Dê ao fazendeiro brown uma chance de fazer algum trabalho
Thread.sleep(SECONDS.toMillis(5));
final int checks = farmerBrown.getChecks();
assertTrue(checks + "", checks &gt; 4);
}
}</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.corn.FarmerBrownTest
Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06
http://tomee.apache.org/
INFO - openejb.home = /Users/dblevins/examples/schedule-expression
INFO - openejb.base = /Users/dblevins/examples/schedule-expression
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/schedule-expression/target/classes
INFO - Beginning load: /Users/dblevins/examples/schedule-expression/target/classes
INFO - Configuring enterprise application: /Users/dblevins/examples/schedule-expression
WARN - Method 'lookup' is not available for 'jakarta.annotation.Resource'. Probably using an older Runtime.
INFO - Configuring Service(id=Default Singleton Container, type=Container, provider-id=Default Singleton Container)
INFO - Auto-creating a container for bean FarmerBrown: Container(type=SINGLETON, id=Default Singleton Container)
INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
INFO - Auto-creating a container for bean org.superbiz.corn.FarmerBrownTest: Container(type=MANAGED, id=Default Managed Container)
INFO - Enterprise application "/Users/dblevins/examples/schedule-expression" loaded.
INFO - Assembling app: /Users/dblevins/examples/schedule-expression
INFO - Jndi(name="java:global/schedule-expression/FarmerBrown!org.superbiz.corn.FarmerBrown")
INFO - Jndi(name="java:global/schedule-expression/FarmerBrown")
INFO - Jndi(name="java:global/EjbModule481105279/org.superbiz.corn.FarmerBrownTest!org.superbiz.corn.FarmerBrownTest")
INFO - Jndi(name="java:global/EjbModule481105279/org.superbiz.corn.FarmerBrownTest")
INFO - Created Ejb(deployment-id=org.superbiz.corn.FarmerBrownTest, ejb-name=org.superbiz.corn.FarmerBrownTest, container=Default Managed Container)
INFO - Created Ejb(deployment-id=FarmerBrown, ejb-name=FarmerBrown, container=Default Singleton Container)
INFO - Started Ejb(deployment-id=org.superbiz.corn.FarmerBrownTest, ejb-name=org.superbiz.corn.FarmerBrownTest, container=Default Managed Container)
INFO - Started Ejb(deployment-id=FarmerBrown, ejb-name=FarmerBrown, container=Default Singleton Container)
INFO - Deployed Application(path=/Users/dblevins/examples/schedule-expression)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.141 sec
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0</code></pre>
</div>
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<h2 id="_apis_used">APIs Used</h2>
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<p><a href="../../../jakartaee-9.0/javadoc/jakarta/annotation/PostConstruct.html">jakarta.annotation.PostConstruct</a></p>
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</li>
<li>
<p><a href="../../../jakartaee-9.0/javadoc/jakarta/ejb/LockType.html">jakarta.ejb.LockType</a></p>
</li>
<li>
<p><a href="../../../jakartaee-9.0/javadoc/jakarta/ejb/ScheduleExpression.html">jakarta.ejb.ScheduleExpression</a></p>
</li>
<li>
<p><a href="../../../jakartaee-9.0/javadoc/jakarta/ejb/Singleton.html">jakarta.ejb.Singleton</a></p>
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<p><a href="../../../jakartaee-9.0/javadoc/jakarta/ejb/TimerService.html">jakarta.ejb.TimerService</a></p>
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<p><a href="../../../jakartaee-9.0/javadoc/jakarta/ejb/embeddable/EJBContainer.html">jakarta.ejb.embeddable.EJBContainer</a></p>
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