Module jakarta.ejb

Package jakarta.ejb

Interface Timer

public interface Timer

The Timer interface contains information about a timer that was created through the enterprise bean Timer Service.

Since:

EJB 2.1

Method Summary

Modifier and Type	Method	Description
void	cancel()	Cause the timer and all its associated expiration notifications to be cancelled.
TimerHandle	getHandle()	Get a serializable handle to the timer.
Serializable	getInfo()	Get the information associated with the timer at the time of creation.
Date	getNextTimeout()	Get the point in time at which the next timer expiration is scheduled to occur.
ScheduleExpression	getSchedule()	Get the schedule expression corresponding to this timer.
long	getTimeRemaining()	Get the number of milliseconds that will elapse before the next scheduled timer expiration.
boolean	isCalendarTimer()	Return whether this timer is a calendar-based timer.
boolean	isPersistent()	Return whether this timer has persistent semantics.

Method Details

cancel

void cancel()
     throws IllegalStateException,
NoSuchObjectLocalException,
EJBException

Cause the timer and all its associated expiration notifications to be cancelled.

Throws:

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

NoSuchObjectLocalException - If invoked on a timer that has expired or has been cancelled.

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

getTimeRemaining

long getTimeRemaining()
               throws IllegalStateException,
NoSuchObjectLocalException,
NoMoreTimeoutsException,
EJBException

Get the number of milliseconds that will elapse before the next scheduled timer expiration.

Returns:

the number of milliseconds that will elapse before the next scheduled timer expiration.

Throws:

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

NoMoreTimeoutsException - Indicates that the timer has no future timeouts

NoSuchObjectLocalException - If invoked on a timer that has expired or has been cancelled.

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

getNextTimeout

Date getNextTimeout()
             throws IllegalStateException,
NoSuchObjectLocalException,
NoMoreTimeoutsException,
EJBException

Get the point in time at which the next timer expiration is scheduled to occur.

Returns:

the point in time at which the next timer expiration is scheduled to occur.

Throws:

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

NoMoreTimeoutsException - Indicates that the timer has no future timeouts

NoSuchObjectLocalException - If invoked on a timer that has expired or has been cancelled.

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

getSchedule

ScheduleExpression getSchedule()
                        throws IllegalStateException,
NoSuchObjectLocalException,
EJBException

Get the schedule expression corresponding to this timer. The timer must be a calendar-based timer. It may have been created automatically or programmatically.

Returns:

schedule expression for the timer.

Throws:

IllegalStateException - If this method is invoked while the instance is in a state that does not allow access to this method. Also thrown if invoked on a timer that is not a calendar-based timer.

NoSuchObjectLocalException - If invoked on a timer that has expired or has been cancelled.

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

Since:

EJB 3.1

isPersistent

boolean isPersistent()
              throws IllegalStateException,
NoSuchObjectLocalException,
EJBException

Return whether this timer has persistent semantics.

Returns:

boolean indicating whether the timer is persistent.

Throws:

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

NoSuchObjectLocalException - If invoked on a timer that has expired or has been cancelled.

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

Since:

EJB 3.1

isCalendarTimer

boolean isCalendarTimer()
                 throws IllegalStateException,
NoSuchObjectLocalException,
EJBException

Return whether this timer is a calendar-based timer.

Returns:

boolean indicating whether the timer is calendar-based.

Throws:

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

NoSuchObjectLocalException - If invoked on a timer that has expired or has been cancelled.

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

Since:

EJB 3.1

getInfo

Serializable getInfo()
              throws IllegalStateException,
NoSuchObjectLocalException,
EJBException

Get the information associated with the timer at the time of creation. This may be the info string that was passed to the timer creation method or the info element of the Schedule annotaiton.

Returns:

The Serializable object that was passed in at timer creation, or null if the info argument passed in at timer creation was null.

Throws:

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

NoSuchObjectLocalException - If invoked on a timer that has expired or has been cancelled.

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

getHandle

TimerHandle getHandle()
               throws IllegalStateException,
NoSuchObjectLocalException,
EJBException

Get a serializable handle to the timer. This handle can be used at a later time to re-obtain the timer reference.

Returns:

a serializable handle to the timer.

Throws:

IllegalStateException - If this method is invoked while the instance is in a state that does not allow access to this method. Also thrown if invoked on a non-persistent timer.

NoSuchObjectLocalException - If invoked on a timer that has expired or has been cancelled.

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