org.springframework.scheduling.annotation

Annotation Type Scheduled

@Target(value={METHOD,ANNOTATION_TYPE})
@Retention(value=RUNTIME)
@Documented
public @interface Scheduled

Annotation that marks a method to be scheduled. Exactly one of the cron(), fixedDelay(), or fixedRate() attributes must be specified.

The annotated method must expect no arguments and have a void return type.

Processing of @Scheduled annotations is performed by registering a ScheduledAnnotationBeanPostProcessor. This can be done manually or, more conveniently, through the <task:annotation-driven/> element or @EnableScheduling annotation.

Since:

3.0

Author:

Mark Fisher, Dave Syer, Chris Beams

See Also:

EnableScheduling, ScheduledAnnotationBeanPostProcessor

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
String	cron A cron-like expression, extending the usual UN*X definition to include triggers on the second as well as minute, hour, day of month, month and day of week.
long	fixedDelay Execute the annotated method with a fixed period between the end of the last invocation and the start of the next.
long	fixedRate Execute the annotated method with a fixed period between invocations.
long	initialDelay Number of milliseconds to delay before the first execution of a fixedRate() or fixedDelay() task.

Element Detail

cron

public abstract String cron

A cron-like expression, extending the usual UN*X definition to include triggers on the second as well as minute, hour, day of month, month and day of week. e.g. "0 * * * * MON-FRI" means once per minute on weekdays (at the top of the minute - the 0th second).

Returns:

an expression that can be parsed to a cron schedule

See Also:

CronSequenceGenerator

Default:

""

fixedDelay

public abstract long fixedDelay

Execute the annotated method with a fixed period between the end of the last invocation and the start of the next.

Returns:

the delay in milliseconds

Default:

-1L

fixedRate

public abstract long fixedRate

Execute the annotated method with a fixed period between invocations.

Returns:

the period in milliseconds

Default:

-1L

initialDelay

public abstract long initialDelay

Number of milliseconds to delay before the first execution of a fixedRate() or fixedDelay() task.

Returns:

the initial delay in milliseconds

Since:

3.2

Default:

0L