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TimerService (JBoss J2EE API) - JBoss 4.0.1 sp1 j2ee API Documentation 英文版文档

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javax.ejb
Interface TimerService

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public interface TimerService

The TimerService interface provides enterprise bean components with access to the container-provided Timer Service. The EJB Timer Service allows entity beans, stateless session beans, and message-driven beans to be registered for timer callback events at a specified time, after a specified elapsed time, or after a specified interval.

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Method Summary
Timer	createTimer(Date initialExpiration, long intervalDuration, Serializable info)           Create an interval timer whose first expiration occurs at a given point in time and whose subsequent expirations occur after a specified interval.
Timer	createTimer(Date expiration, Serializable info)           Create a single-action timer that expires at a given point in time.
Timer	createTimer(long initialDuration, long intervalDuration, Serializable info)           Create an interval timer whose first expiration occurs after a specified duration, and whose subsequent expirations occur after a specified interval.
Timer	createTimer(long duration, Serializable info)           Create a single-action timer that expires after a specified duration.
Collection	getTimers()           Get all the active timers associated with this bean.

 

Method Detail

createTimer

public Timer createTimer(long duration,
                         Serializable info)
                  throws IllegalArgumentException,
                         IllegalStateException,
                         EJBException

Create a single-action timer that expires after a specified duration.

Parameters:

duration - The number of milliseconds that must elapse before the timer expires.

info - Application information to be delivered along with the timer expiration notification. This can be null.

Returns:

The newly created Timer.

Throws:

IllegalArgumentException - If duration is negative

IllegalStateException - If this method is invoked while the instance is in a state that does not allow access to this method.

EJBException - If this method could not complete due to a system-level failure.

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createTimer

public Timer createTimer(long initialDuration,
                         long intervalDuration,
                         Serializable info)
                  throws IllegalArgumentException,
                         IllegalStateException,
                         EJBException

Create an interval timer whose first expiration occurs after a specified duration, and whose subsequent expirations occur after a specified interval.

Parameters:

initialDuration - The number of milliseconds that must elapse before the first timer expiration notification.

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".

info - Application information to be delivered along with the timer expiration notification. This can be null.

Returns:

The newly created Timer.

Throws:

IllegalArgumentException - If initialDuration is negative, or intervalDuration is negative.

IllegalStateException - If this method is invoked while the instance is in a state that does not allow access to this method.

EJBException - If this method could not complete due to a system-level failure.

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createTimer

public Timer createTimer(Date expiration,
                         Serializable info)
                  throws IllegalArgumentException,
                         IllegalStateException,
                         EJBException

Create a single-action timer that expires at a given point in time.

Parameters:

expiration - The point in time at which the timer must expire.

info - Application information to be delivered along with the timer expiration notification. This can be null.

Returns:

The newly created Timer.

Throws:

IllegalArgumentException - If expiration is null, or expiration.getTime() is negative.

IllegalStateException - If this method is invoked while the instance is in a state that does not allow access to this method.

EJBException - If this method could not complete due to a system-level failure.

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createTimer

public Timer createTimer(Date initialExpiration,
                         long intervalDuration,
                         Serializable info)
                  throws IllegalArgumentException,
                         IllegalStateException,
                         EJBException

Create an interval timer whose first expiration occurs at a given point in time and whose subsequent expirations occur after a specified interval.

Parameters:

initialExpiration - The point in time at which the first timer expiration must occur.

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".

info - Application information to be delivered along with the timer expiration notification. This can be null.

Returns:

The newly created Timer.

Throws:

IllegalArgumentException - If initialExpiration is null, or initialExpiration.getTime() is negative, or intervalDuration is negative.

IllegalStateException - If this method is invoked while the instance is in a state that does not allow access to this method.

EJBException - If this method could not complete due to a system-level failure.

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getTimers

public Collection getTimers()
                     throws IllegalStateException,
                            EJBException

Get all the active timers associated with this bean.

Returns:

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.

EJBException - If this method could not complete due to a system-level failure.

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