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Quartz service used for Timer service
/**
* EasyBeans
* Copyright (C) 2007 Bull S.A.S.
* Contact: [email protected]
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* --------------------------------------------------------------------------
* $Id: QuartzTimerService.java 4463 2009-01-21 13:52:01Z benoitf $
* --------------------------------------------------------------------------
*/
package org.ow2.easybeans.component.quartz;
import static org.ow2.easybeans.api.OperationState.AFTER_COMPLETION;
import static org.ow2.easybeans.api.OperationState.DEPENDENCY_INJECTION;
import static org.ow2.easybeans.api.OperationState.LIFECYCLE_CALLBACK_INTERCEPTOR;
import static org.quartz.SimpleTrigger.REPEAT_INDEFINITELY;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import javax.ejb.EJBException;
import javax.ejb.Timer;
import javax.ejb.TimerService;
import org.ow2.easybeans.api.Factory;
import org.ow2.easybeans.api.IStatefulSessionFactory;
import org.ow2.easybeans.api.OperationState;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SimpleTrigger;
import org.quartz.Trigger;
/**
* Implementation of the EJB Timer service that is based on the Quartz
* framework.
* @author Florent Benoit
*/
public class QuartzTimerService implements TimerService {
/**
* An EJB Timer service is linked to an EasyBeans factory.
*/
private Factory factory = null;
/**
* The timer service is also linked to a Quartz scheduler.
*/
private Scheduler scheduler = null;
/**
* Name of the group for triggers.
*/
private String triggerGroupName = null;
/**
* Trigger name ID.
*/
private long triggerId = 0;
/**
* JobDetail id.
*/
private long jobDetailId = 0;
/**
* Build a new instance of the EJB Timer service for the given factory and
* the given scheduler.
* @param factory the given factory
* @param scheduler the given scheduler
*/
public QuartzTimerService(final Factory factory, final Scheduler scheduler) {
this.factory = factory;
this.scheduler = scheduler;
this.triggerGroupName = factory.getId();
}
/**
* Create a single-action timer that expires after a specified duration.
* @param duration The number of milliseconds that must elapse before the
* timer expires.
* @param info Application information to be delivered along with the timer
* expiration notification. This can be null.
* @return The newly created Timer.
* @throws IllegalArgumentException If duration is negative
* @throws IllegalStateException If this method is invoked while the
* instance is in a state that does not allow access to this method.
* @throws EJBException If this method fails due to a system-level failure.
*/
public Timer createTimer(final long duration, final Serializable info) throws IllegalArgumentException,
IllegalStateException, EJBException {
// Disallowed from stateful
if (this.factory instanceof IStatefulSessionFactory) {
throw new IllegalStateException("The createTimer() method cannot be called from a stateful session bean.");
}
OperationState operationState = this.factory.getOperationState();
if (DEPENDENCY_INJECTION == operationState || LIFECYCLE_CALLBACK_INTERCEPTOR == operationState
|| AFTER_COMPLETION == operationState) {
throw new IllegalStateException(
"The createTimer(duration, info) method cannot be called within the operation state '" + operationState
+ "'.");
}
// Use other method
return createTimer(new Date(System.currentTimeMillis() + duration), info);
}
/**
* Create an interval timer whose first expiration occurs after a specified
* duration, and whose subsequent expirations occur after a specified
* interval.
* @param initialDuration The number of milliseconds that must elapse before
* the first timer expiration notification.
* @param intervalDuration The number of milliseconds that must elapse
* between timer expiration notifications. Expiration notifications
* are scheduled relative to the time of the first expiration. If
* expiration is delayed(e.g. due to the interleaving of other method
* calls on the bean) two or more expiration notifications may occur
* in close succession to "catch up".
* @param info Application information to be delivered along with the timer
* expiration. This can be null.
* @return The newly created Timer.
* @throws IllegalArgumentException If initialDuration is negative, or
* intervalDuration is negative.
* @throws IllegalStateException If this method is invoked while the
* instance is in a state that does not allow access to this method.
* @throws EJBException If this method could not complete due to a
* system-level failure.
*/
public Timer createTimer(final long initialDuration, final long intervalDuration, final Serializable info)
throws IllegalArgumentException, IllegalStateException, EJBException {
// Disallowed from stateful
if (this.factory instanceof IStatefulSessionFactory) {
throw new IllegalStateException("The createTimer() method cannot be called from a stateful session bean.");
}
OperationState operationState = this.factory.getOperationState();
if (DEPENDENCY_INJECTION == operationState || LIFECYCLE_CALLBACK_INTERCEPTOR == operationState
|| AFTER_COMPLETION == operationState) {
throw new IllegalStateException("The createTimer(duratinitialDurationion, intervalDuration, info) "
+ " method cannot be called within the operation state '" + operationState + "'.");
}
// Compute start date for initial expiration
Date initialExpiration = new Date(System.currentTimeMillis() + initialDuration);
// Use the method using Date parameter
return createTimer(initialExpiration, intervalDuration, info);
}
/**
* Create a single-action timer that expires at a given point in time.
* @param expiration The point in time at which the timer must expire.
* @param info Application information to be delivered along with the timer
* expiration notification. This can be null.
* @return The newly created Timer.
* @throws IllegalArgumentException If expiration is null, or
* expiration.getTime() is negative.
* @throws IllegalStateException If this method is invoked while the
* instance is in a state that does not allow access to this method.
* @throws EJBException If this method could not complete due to a
* system-level failure.
*/
public Timer createTimer(final Date expiration, final Serializable info) throws IllegalArgumentException,
IllegalStateException, EJBException {
// Disallowed from stateful
if (this.factory instanceof IStatefulSessionFactory) {
throw new IllegalStateException("The createTimer() method cannot be called from a stateful session bean.");
}
OperationState operationState = this.factory.getOperationState();
if (DEPENDENCY_INJECTION == operationState || LIFECYCLE_CALLBACK_INTERCEPTOR == operationState
|| AFTER_COMPLETION == operationState) {
throw new IllegalStateException(
"The createTimer(expiration, info) method cannot be called within the operation state '" + operationState
+ "'.");
}
// Create the trigger that won't repeat
Trigger trigger = new SimpleTrigger(getTriggerName(), getTriggerGroupName(), expiration);
// Get timer
return internalTimer(trigger, info);
}
/**
* Create an interval timer whose first expiration occurs at a given point
* in time and whose subsequent expirations occur after a specified
* interval.
* @param initialExpiration The point in time at which the first timer
* expiration must occur.
* @param intervalDuration The number of milliseconds that must elapse
* between timer expiration notifications. Expiration notifications
* are scheduled relative to the time of the first expiration. If
* expiration is delayed(e.g. due to the interleaving of other method
* calls on the bean) two or more expiration notifications may occur
* in close succession to "catch up".
* @param info Application information to be delivered along with the timer
* expiration. This can be null.
* @return The newly created Timer.
* @throws IllegalArgumentException If initialExpiration is null, or
* initialExpiration.getTime() is negative, or intervalDuration is
* negative.
* @throws IllegalStateException If this method is invoked while the
* instance is in a state that does not allow access to this method.
* @throws EJBException If this method could not complete due to a
* system-level failure.
*/
public Timer createTimer(final Date initialExpiration, final long intervalDuration, final Serializable info)
throws IllegalArgumentException, IllegalStateException, EJBException {
// Disallowed from stateful
if (this.factory instanceof IStatefulSessionFactory) {
throw new IllegalStateException("The createTimer() method cannot be called from a stateful session bean.");
}
OperationState operationState = this.factory.getOperationState();
if (DEPENDENCY_INJECTION == operationState || LIFECYCLE_CALLBACK_INTERCEPTOR == operationState
|| AFTER_COMPLETION == operationState) {
throw new IllegalStateException("The createTimer(initialExpiration, intervalDuration, info) "
+ "method cannot be called within the operation state '" + operationState + "'.");
}
// Create the trigger (repeat indefinitely)
Trigger trigger = new SimpleTrigger(getTriggerName(), getTriggerGroupName(), initialExpiration, null,
REPEAT_INDEFINITELY, intervalDuration);
// Get timer
return internalTimer(trigger, info);
}
/**
* Create a timer object that is sent to the client. Also, create a new job
* and send it to the Quartz Scheduler.
* @param trigger the object containing the data for the scheduling.
* @param info the optional serializable object given by the developer.
* @return a Timer object.
*/
private Timer internalTimer(final Trigger trigger, final Serializable info) {
// Add stuff into the data of the job detail
EasyBeansJobDetailData beansJobDetailData = new EasyBeansJobDetailData();
beansJobDetailData.setInfo(info);
// Options for finding the factory again
Integer easyBeansServerID = this.factory.getContainer().getConfiguration().getEZBServer().getID();
beansJobDetailData.setEasyBeansServerID(easyBeansServerID);
beansJobDetailData.setContainerId(this.factory.getContainer().getId());
beansJobDetailData.setFactoryName(this.factory.getBeanInfo().getName());
// Build the Job Detail
EasyBeansJobDetail jobDetail = new EasyBeansJobDetail(getNewJobDetailName(), getJobDetailGroupName(), beansJobDetailData);
// Build a new timer object
Timer timer = new EasyBeansTimer(jobDetail, trigger, this.scheduler, this.factory);
// Add it as a data
beansJobDetailData.setTimer(timer);
// Schedule the job
try {
this.scheduler.scheduleJob(jobDetail, trigger);
} catch (SchedulerException e) {
throw new EJBException("Cannot schedule the given job '" + jobDetail + "'.", e);
}
// ...and return the timer
return timer;
}
/**
* Get all the active timers associated with this bean.
* @return A collection of javax.ejb.Timer objects.
* @throws IllegalStateException If this method is invoked while the
* instance is in a state that does not allow access to this method.
* @throws EJBException If this method could not complete due to a
* system-level failure.
*/
public Collection getTimers() throws IllegalStateException, EJBException {
// Disallowed from stateful
if (this.factory instanceof IStatefulSessionFactory) {
throw new IllegalStateException("The getTimers() method cannot be called from a stateful session bean.");
}
OperationState operationState = this.factory.getOperationState();
if (DEPENDENCY_INJECTION == operationState || LIFECYCLE_CALLBACK_INTERCEPTOR == operationState
|| AFTER_COMPLETION == operationState) {
throw new IllegalStateException(
"The createTimer(duration, info) method cannot be called within the operation state '" + operationState
+ "'.");
}
Collection timers = new ArrayList();
// Get the list of job names for this group
String[] jobNames = null;
try {
jobNames = this.scheduler.getJobNames(getJobDetailGroupName());
} catch (SchedulerException e) {
throw new EJBException("Unable to get the job names from the scheduler for the group named '"
+ getJobDetailGroupName() + "'.", e);
}
// If there are jobs, get the detail and trigger
if (jobNames != null) {
// For each job name
for (String jobName : jobNames) {
// Get detail
JobDetail jobDetail = null;
try {
jobDetail = this.scheduler.getJobDetail(jobName, getJobDetailGroupName());
} catch (SchedulerException e) {
throw new EJBException("Cannot get the jobDetail for the jobName '" + jobName + "'.", e);
}
// Cast to correct object
EasyBeansJobDetail easyBeansJobDetail = null;
if (jobDetail instanceof EasyBeansJobDetail) {
easyBeansJobDetail = (EasyBeansJobDetail) jobDetail;
} else {
throw new EJBException("JobDetail found for the job named '" + jobName
+ "' is not an EasyBeansJobDetail object");
}
// Get triggers
Trigger[] triggers = null;
try {
triggers = this.scheduler.getTriggersOfJob(jobName, getJobDetailGroupName());
} catch (SchedulerException e) {
throw new EJBException("Cannot get triggers for the job named '" + jobName + "'.", e);
}
// Should be only once trigger per job
if (triggers == null || triggers.length > 1) {
throw new EJBException("Invalid numbers of triggers found for the job named '" + jobName + "'.");
}
// Build a timer object and return it
timers.add(new EasyBeansTimer(easyBeansJobDetail, triggers[0], this.scheduler, this.factory));
}
}
// Return the list of the timers for this timer service.
return timers;
}
/**
* Get an unique identifier for a Trigger name.
* @return a new trigger name
*/
private synchronized String getTriggerName() {
return "triggerTimer" + (this.triggerId++);
}
/**
* Get an unique identifier for a JobDetail name.
* @return a new job detail name
*/
private synchronized String getNewJobDetailName() {
return "jobDetail" + (this.jobDetailId++);
}
/**
* Get the group name for each Trigger.
* @return the group name
*/
private String getTriggerGroupName() {
return this.triggerGroupName;
}
/**
* Get the group name for each job detail.
* @return the group name
*/
private String getJobDetailGroupName() {
return "jobDetailGroup" + this.factory.getClassName();
}
/**
* Gets the Scheduler.
* @return the scheduler.
*/
public Scheduler getScheduler() {
return this.scheduler;
}
}
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