Created
September 28, 2010 13:09
-
-
Save nickspacek/600953 to your computer and use it in GitHub Desktop.
Abstract Quartz Trigger that will retry itself if requested by concrete implementations
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package com.lashpoint.twitter.quartz; | |
public class RescheduleException extends Error { | |
/** | |
* | |
*/ | |
private static final long serialVersionUID = -253876682421574999L; | |
public RescheduleException(Throwable t) { | |
super(t); | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package com.lashpoint.quartz; | |
import java.util.Calendar; | |
import java.util.Date; | |
import org.quartz.JobExecutionContext; | |
import org.quartz.JobExecutionException; | |
import org.quartz.SchedulerException; | |
import org.quartz.SimpleTrigger; | |
import com.lashpoint.twitter.quartz.RescheduleException; | |
public abstract class RetriableTrigger extends SimpleTrigger { | |
/** | |
* | |
*/ | |
private static final long serialVersionUID = 2986291750485640660L; | |
private static final int DELAY_CEILING = 600; // 15 minutes | |
private static final int DELAY_EXP_BASE = 2; // Delays will be a power of 2 | |
public RetriableTrigger(String name, Date startDate) { | |
super(name, startDate, null, 0, 0); | |
} | |
@Override | |
public boolean hasAdditionalProperties() { | |
return true; | |
} | |
@Override | |
public int executionComplete(JobExecutionContext context, | |
JobExecutionException result) { | |
if (shouldReschedule(context, result)) { | |
try { | |
RetriableTrigger nextTrigger = createTriggerForReschedule(context, | |
result); | |
if (nextTrigger != null) { | |
context.getScheduler().rescheduleJob(getName(), getGroup(), | |
nextTrigger); | |
return INSTRUCTION_NOOP; | |
} | |
} | |
catch (SchedulerException e) { | |
throw new RescheduleException(e); | |
} | |
} | |
return INSTRUCTION_DELETE_TRIGGER; | |
} | |
protected abstract boolean shouldReschedule(JobExecutionContext context, | |
JobExecutionException result); | |
protected RetriableTrigger createTriggerForReschedule(JobExecutionContext context, | |
JobExecutionException result) { | |
try { | |
RetriableTrigger trigger = getClass().newInstance(); | |
Calendar nextFireTime = Calendar.getInstance(); | |
nextFireTime.add(Calendar.SECOND, Math.min(DELAY_CEILING, | |
(int)Math.pow(DELAY_EXP_BASE, getTimesTriggered()))); | |
trigger.setStartTime(nextFireTime.getTime()); | |
trigger.setJobName(getJobName()); | |
trigger.setJobGroup(getJobGroup()); | |
trigger.setTimesTriggered(getTimesTriggered()); | |
return trigger; | |
} | |
catch (InstantiationException e) { | |
throw new RescheduleException(e); | |
} | |
catch (IllegalAccessException e) { | |
throw new RescheduleException(e); | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment