org.springframework.scheduling.support

Class CronTrigger

java.lang.Object

org.springframework.scheduling.support.CronTrigger

All Implemented Interfaces:

Trigger

public class CronTrigger
extends java.lang.Object
implements Trigger

Trigger implementation for cron expressions. Wraps a CronSequenceGenerator.

Since:

3.0

Author:

Juergen Hoeller

See Also:

CronSequenceGenerator

Field Summary

Fields

Modifier and Type	Field and Description
private CronSequenceGenerator	sequenceGenerator

Constructor Summary

Constructors

Constructor and Description
CronTrigger(java.lang.String expression) Build a CronTrigger from the pattern provided in the default time zone.
CronTrigger(java.lang.String expression, java.util.TimeZone timeZone) Build a CronTrigger from the pattern provided in the given time zone.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other)
java.lang.String	getExpression() Return the cron pattern that this trigger has been built with.
int	hashCode()
java.util.Date	nextExecutionTime(TriggerContext triggerContext) Determine the next execution time according to the given trigger context.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

sequenceGenerator

private final CronSequenceGenerator sequenceGenerator

Constructor Detail

CronTrigger

public CronTrigger(java.lang.String expression)

Build a CronTrigger from the pattern provided in the default time zone.

Parameters:

expression - a space-separated list of time fields, following cron expression conventions

CronTrigger

public CronTrigger(java.lang.String expression,
                   java.util.TimeZone timeZone)

Build a CronTrigger from the pattern provided in the given time zone.

Parameters:

expression - a space-separated list of time fields, following cron expression conventions

timeZone - a time zone in which the trigger times will be generated

Method Detail

getExpression

public java.lang.String getExpression()

Return the cron pattern that this trigger has been built with.

nextExecutionTime

public java.util.Date nextExecutionTime(TriggerContext triggerContext)

Determine the next execution time according to the given trigger context.

Next execution times are calculated based on the completion time of the previous execution; therefore, overlapping executions won't occur.

Specified by:

nextExecutionTime in interface Trigger

Parameters:

triggerContext - context object encapsulating last execution times and last completion time

Returns:

the next execution time as defined by the trigger, or null if the trigger won't fire anymore

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object