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package javax.ejb;
import java.io.Serializable;
import java.util.Date;
import java.util.Collection;
/**
* 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.
*
*/
public interface TimerService {
/**
* Create a single-action timer that expires after a specified duration.
*
* @param duration The number of milliseconds that must elapse before
* the timer expires.
*
* @param info Application information to be delivered along
* with the timer expiration notification. This can be null.
*
* @return The newly created Timer.
*
* @exception java.lang.IllegalArgumentException If duration is negative
*
* @exception java.lang.IllegalStateException If this method is
* invoked while the instance is in a state that does not allow access
* to this method.
*
* @exception javax.ejb.EJBException If this method fails due to a
* system-level failure.
*
*/
public Timer createTimer(long duration, Serializable info) throws
java.lang.IllegalArgumentException, java.lang.IllegalStateException,
javax.ejb.EJBException;
/**
* Create an interval timer whose first expiration occurs after a specified
* duration, and whose subsequent expirations occur after a specified
* interval.
*
* @param initialDuration The number of milliseconds that must elapse
* before the first timer expiration notification.
*
* @param 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".
*
* @param info Application information to be delivered along
* with the timer expiration. This can be null.
*
* @return The newly created Timer.
*
* @exception java.lang.IllegalArgumentException If initialDuration is
* negative, or intervalDuration is negative.
*
* @exception java.lang.IllegalStateException If this method is
* invoked while the instance is in a state that does not allow access
* to this method.
*
* @exception javax.ejb.EJBException If this method could not complete
* due to a system-level failure.
*
*/
public Timer createTimer(long initialDuration, long intervalDuration,
Serializable info) throws
java.lang.IllegalArgumentException, java.lang.IllegalStateException,
javax.ejb.EJBException;
/**
* Create a single-action timer that expires at a given point in time.
*
* @param expiration The point in time at which the timer must expire.
*
* @param info Application information to be delivered along
* with the timer expiration notification. This can be null.
*
* @return The newly created Timer.
*
* @exception java.lang.IllegalArgumentException If expiration is null, or
* expiration.getTime() is negative.
*
* @exception java.lang.IllegalStateException If this method is
* invoked while the instance is in a state that does not allow access
* to this method.
*
* @exception javax.ejb.EJBException If this method could not complete
* due to a system-level failure.
*
*/
public Timer createTimer(Date expiration, Serializable info) throws
java.lang.IllegalArgumentException, java.lang.IllegalStateException,
javax.ejb.EJBException;
/**
* Create an interval timer whose first expiration occurs at a given
* point in time and whose subsequent expirations occur after a specified
* interval.
*
* @param initialExpiration The point in time at which the first timer
* expiration must occur.
*
* @param 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".
*
* @param info Application information to be delivered along
* with the timer expiration. This can be null.
*
* @return The newly created Timer.
*
* @exception java.lang.IllegalArgumentException If initialExpiration is
* null, or initialExpiration.getTime() is negative, or intervalDuration
* is negative.
*
* @exception java.lang.IllegalStateException If this method is
* invoked while the instance is in a state that does not allow access
* to this method.
*
* @exception javax.ejb.EJBException If this method could not complete
* due to a system-level failure.
*
*/
public Timer createTimer(Date initialExpiration, long intervalDuration,
Serializable info) throws
java.lang.IllegalArgumentException, java.lang.IllegalStateException,
javax.ejb.EJBException;
/**
* Get all the active timers associated with this bean.
*
* @return A collection of javax.ejb.Timer objects.
*
* @exception java.lang.IllegalStateException If this method is
* invoked while the instance is in a state that does not allow access
* to this method.
*
* @exception javax.ejb.EJBException If this method could not complete
* due to a system-level failure.
*
*/
public Collection getTimers() throws java.lang.IllegalStateException,
javax.ejb.EJBException;
}
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