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| |
| <h1>Schedule Expression</h1> |
| </div> |
| </div> |
| </div> |
| <div class="row"> |
| |
| <div class="col-md-12"> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In this example we exercise the <code>TimerService</code>.</p> |
| </div> |
| <div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>``The TimerService interface provides enterprise bean components with |
| access to the container-provided Timer Service. The EJB Timer Service |
| allows entity beans, stateless session beans, and message-driven beans |
| to be registered for timer callback events at a specified time, after a |
| specified elapsed time, or after a specified interval.''</p> |
| </div> |
| </blockquote> |
| </div> |
| <div class="paragraph"> |
| <p>For a complete description of the TimerService, please refer to the Java |
| EE tutorial dedicated to the |
| <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>At <code>PostConstruct</code> we create 5 programmatic timers. First four will most |
| likely not be triggered during the test execution, however the last one |
| will timeout a couple of times.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Each timer contains an info attribute, which can be inspected at |
| timeout.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.corn; |
| |
| import javax.annotation.PostConstruct; |
| import javax.annotation.Resource; |
| import javax.ejb.Lock; |
| import javax.ejb.LockType; |
| import javax.ejb.ScheduleExpression; |
| import javax.ejb.Singleton; |
| import javax.ejb.Startup; |
| import javax.ejb.Timeout; |
| import javax.ejb.Timer; |
| import javax.ejb.TimerConfig; |
| import javax.ejb.TimerService; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * This is where we schedule all of Farmer Brown's corn jobs |
| * |
| * @version $Revision$ $Date$ |
| */ |
| @Singleton |
| @Lock(LockType.READ) // allows timers to execute in parallel |
| @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() { |
| // Dig out the planter!!! |
| } |
| |
| private void harvestTheCorn() { |
| // Dig out the combine!!! |
| } |
| |
| 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>The test class acquires an instance from the context and waits for 5 |
| seconds to give the timers a chance to timeout.</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 javax.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"); |
| |
| // Give Farmer brown a chance to do some work |
| Thread.sleep(SECONDS.toMillis(5)); |
| |
| final int checks = farmerBrown.getChecks(); |
| assertTrue(checks + "", checks > 4); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_running">Running</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 'javax.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 'javax.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> |
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