In this example we exercise the TimerService.
"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."
For a complete description of the TimerService, please refer to the Java EE tutorial dedicated to the Timer Service.
At PostConstruct 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.
Each timer contains an info attribute, which can be inspected at timeout.
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();
}
}
The test class acquires an instance from the context and waits for 5 seconds to give the timers a chance to timeout.
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);
}
}
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T E S T S
-------------------------------------------------------
Running org.superbiz.corn.FarmerBrownTest
Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06
http://openejb.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
svn co http://svn.apache.org/repos/asf/tomee/tomee//examples/schedule-expression cd schedule-expression mvn clean install