org.quartz.triggers

Class CronTriggerImpl

java.lang.Object

org.quartz.triggers.AbstractTrigger

org.quartz.triggers.CronTriggerImpl

All Implemented Interfaces:

Serializable, Cloneable, Comparable<Trigger>, CronTrigger, MutableTrigger, OperableTrigger, Trigger

public class CronTriggerImpl
extends AbstractTrigger
implements CronTrigger

A concrete Trigger that is used to fire a JobDetail at given moments in time, defined with Unix 'cron-like' definitions.

Author:

Sharada Jambula, James House, Contributions from Mads Henderson

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.quartz.triggers.Trigger

Trigger.CompletedExecutionInstruction, Trigger.TriggerTimeComparator

Field Summary

Fields inherited from class org.quartz.triggers.AbstractTrigger

endTime, nextFireTime, previousFireTime, startTime

Fields inherited from interface org.quartz.triggers.CronTrigger

MISFIRE_INSTRUCTION_DO_NOTHING, MISFIRE_INSTRUCTION_FIRE_ONCE_NOW

Fields inherited from interface org.quartz.triggers.Trigger

DEFAULT_PRIORITY, MISFIRE_INSTRUCTION_IGNORE_MISFIRE_POLICY, MISFIRE_INSTRUCTION_SMART_POLICY

Constructor Summary

Constructors

Constructor and Description
CronTriggerImpl() Create a CronTrigger with no settings.

Method Summary

Modifier and Type	Method and Description
Object	clone()
Date	computeFirstFireTime(Calendar calendar) Called by the scheduler at the time a Trigger is first added to the scheduler, in order to have the Trigger compute its first fire time, based on any associated calendar.
String	getCronExpression()
Date	getEndTime() Get the time at which the CronTrigger should quit repeating - even if repeastCount isn't yet satisfied.
String	getExpressionSummary()
Date	getFinalFireTime() NOT YET IMPLEMENTED: Returns the final time at which the CronTrigger will fire.
Date	getFireTimeAfter(Date afterTime) Returns the next time at which the CronTrigger will fire, after the given time.
Date	getNextFireTime() Returns the next time at which the Trigger is scheduled to fire.
Date	getPreviousFireTime() Returns the previous time at which the CronTrigger fired.
Date	getStartTime() Get the time at which the CronTrigger should occur.
TimeZone	getTimeZone() Returns the time zone for which the cronExpression of this CronTrigger will be resolved.
boolean	mayFireAgain() Determines whether or not the CronTrigger will occur again.
void	setCronExpression(CronExpression cronExpression) Set the CronExpression to the given one.
void	setCronExpression(String cronExpression)
void	setEndTime(Date endTime) Set the time at which the Trigger should quit repeating - regardless of any remaining repeats (based on the trigger's particular repeat settings).
void	setNextFireTime(Date nextFireTime) Sets the next time at which the CronTrigger will fire.
void	setPreviousFireTime(Date previousFireTime) Set the previous time at which the CronTrigger fired.
void	setStartTime(Date startTime) The time at which the trigger's scheduling should start.
void	setTimeZone(TimeZone timeZone) Sets the time zone for which the cronExpression of this CronTrigger will be resolved.
String	toString()
void	triggered(Calendar calendar) Called when the Scheduler has decided to 'fire' the trigger (execute the associated Job), in order to give the Trigger a chance to update itself for its next triggering (if any).
void	updateAfterMisfire(Calendar cal) Updates the CronTrigger's state based on the MISFIRE_INSTRUCTION_XXX that was selected when the CronTrigger was created.
protected boolean	validateMisfireInstruction(int misfireInstruction)

Methods inherited from class org.quartz.triggers.AbstractTrigger

compareTo, equals, executionComplete, getCalendarName, getDescription, getFireInstanceId, getJobDataMap, getJobName, getMisfireInstruction, getName, getPriority, hashCode, setCalendarName, setDescription, setFireInstanceId, setJobDataMap, setJobName, setMisfireInstruction, setName, setPriority, validate

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.quartz.triggers.Trigger

equals, getCalendarName, getDescription, getJobDataMap, getJobName, getMisfireInstruction, getName, getPriority

Methods inherited from interface java.lang.Comparable

compareTo

Constructor Detail

CronTriggerImpl

public CronTriggerImpl()

Create a CronTrigger with no settings.

The start-time will also be set to the current time, and the time zone will be set the the system's default time zone.

Method Detail

clone

public Object clone()

Specified by:

clone in interface MutableTrigger

Overrides:

clone in class AbstractTrigger

setCronExpression

public void setCronExpression(String cronExpression)
                       throws ParseException

Throws:

ParseException

getCronExpression

public String getCronExpression()

Specified by:

getCronExpression in interface CronTrigger

setCronExpression

public void setCronExpression(CronExpression cronExpression)

Set the CronExpression to the given one. The TimeZone on the passed-in CronExpression over-rides any that was already set on the Trigger.

Parameters:

cronExpression -

getStartTime

public Date getStartTime()

Get the time at which the CronTrigger should occur.

Specified by:

getStartTime in interface Trigger

setStartTime

public void setStartTime(Date startTime)

Description copied from interface: MutableTrigger

The time at which the trigger's scheduling should start. May or may not be the first actual fire time of the trigger, depending upon the type of trigger and the settings of the other properties of the trigger. However the first actual first time will not be before this date.

Setting a value in the past may cause a new trigger to compute a first fire time that is in the past, which may cause an immediate misfire of the trigger.

Specified by:

setStartTime in interface MutableTrigger

getEndTime

public Date getEndTime()

Get the time at which the CronTrigger should quit repeating - even if repeastCount isn't yet satisfied.

Specified by:

getEndTime in interface Trigger

See Also:

getFinalFireTime()

setEndTime

public void setEndTime(Date endTime)

Description copied from interface: MutableTrigger

Set the time at which the Trigger should quit repeating - regardless of any remaining repeats (based on the trigger's particular repeat settings).

Specified by:

setEndTime in interface MutableTrigger

See Also:

TriggerUtils#computeEndTimeToAllowParticularNumberOfFirings(Trigger, Calendar, int)

getNextFireTime

public Date getNextFireTime()

Returns the next time at which the Trigger is scheduled to fire. If the trigger will not fire again, null will be returned. Note that the time returned can possibly be in the past, if the time that was computed for the trigger to next fire has already arrived, but the scheduler has not yet been able to fire the trigger (which would likely be due to lack of resources e.g. threads).

The value returned is not guaranteed to be valid until after the Trigger has been added to the scheduler.

Specified by:

getNextFireTime in interface Trigger

See Also:

TriggerUtils#computeFireTimesBetween(Trigger, org.quartz.core.Calendar , Date, Date)

getPreviousFireTime

public Date getPreviousFireTime()

Returns the previous time at which the CronTrigger fired. If the trigger has not yet fired, null will be returned.

Specified by:

getPreviousFireTime in interface Trigger

setNextFireTime

public void setNextFireTime(Date nextFireTime)

Sets the next time at which the CronTrigger will fire. This method should not be invoked by client code.

Specified by:

setNextFireTime in interface OperableTrigger

setPreviousFireTime

public void setPreviousFireTime(Date previousFireTime)

Set the previous time at which the CronTrigger fired.

This method should not be invoked by client code.

Specified by:

setPreviousFireTime in interface OperableTrigger

getTimeZone

public TimeZone getTimeZone()

Description copied from interface: CronTrigger

Returns the time zone for which the cronExpression of this CronTrigger will be resolved.

Specified by:

getTimeZone in interface CronTrigger

setTimeZone

public void setTimeZone(TimeZone timeZone)

Sets the time zone for which the cronExpression of this CronTrigger will be resolved.

If setCronExpression(CronExpression) is called after this method, the TimeZone setting on the CronExpression will "win". However if setCronExpression(String) is called after this method, the time zone applied by this method will remain in effect, since the String cron expression does not carry a time zone!

getFireTimeAfter

public Date getFireTimeAfter(Date afterTime)

Returns the next time at which the CronTrigger will fire, after the given time. If the trigger will not fire after the given time, null will be returned.

Note that the date returned is NOT validated against the related org.quartz.Calendar (if any)

Specified by:

getFireTimeAfter in interface Trigger

getFinalFireTime

public Date getFinalFireTime()

NOT YET IMPLEMENTED: Returns the final time at which the CronTrigger will fire.

Note that the return time *may* be in the past. and the date returned is not validated against org.quartz.calendar

Specified by:

getFinalFireTime in interface Trigger

mayFireAgain

public boolean mayFireAgain()

Determines whether or not the CronTrigger will occur again.

Specified by:

mayFireAgain in interface Trigger

validateMisfireInstruction

protected boolean validateMisfireInstruction(int misfireInstruction)

Specified by:

validateMisfireInstruction in class AbstractTrigger

updateAfterMisfire

public void updateAfterMisfire(Calendar cal)

Updates the CronTrigger's state based on the MISFIRE_INSTRUCTION_XXX that was selected when the CronTrigger was created.

If the misfire instruction is set to MISFIRE_INSTRUCTION_SMART_POLICY, then the following scheme will be used:

• The instruction will be interpreted as MISFIRE_INSTRUCTION_FIRE_ONCE_NOW

Specified by:

updateAfterMisfire in interface OperableTrigger

triggered

public void triggered(Calendar calendar)

Called when the Scheduler has decided to 'fire' the trigger (execute the associated Job), in order to give the Trigger a chance to update itself for its next triggering (if any).

Specified by:

triggered in interface OperableTrigger

See Also:

AbstractTrigger.executionComplete(JobExecutionContext, JobExecutionException)

computeFirstFireTime

public Date computeFirstFireTime(Calendar calendar)

Called by the scheduler at the time a Trigger is first added to the scheduler, in order to have the Trigger compute its first fire time, based on any associated calendar.

After this method has been called, getNextFireTime() should return a valid answer.

Specified by:

computeFirstFireTime in interface OperableTrigger

Returns:

the first time at which the Trigger will be fired by the scheduler, which is also the same value getNextFireTime() will return (until after the first firing of the Trigger).

getExpressionSummary

public String getExpressionSummary()

Specified by:

getExpressionSummary in interface CronTrigger

toString

public String toString()

Overrides:

toString in class AbstractTrigger