com.sun.ejb.containers

Class EJBTimerService

java.lang.Object

com.sun.ejb.containers.EJBTimerService

public class EJBTimerService
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EJBTimerService.TimerCache

Field Summary

Fields

Modifier and Type	Field and Description
protected EjbContainerUtil	ejbContainerUtil
protected boolean	isDas
protected String	ownerIdOfThisServer_
static int	STATE_ACTIVE
static int	STATE_CANCELLED
protected EJBTimerService.TimerCache	timerCache_
protected long	totalTimedObjectsInitialized_

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EJBTimerService()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	_createTimer(TimerPrimaryKey timerId, long containerId, long applicationId, Object timedObjectPrimaryKey, String server_name, Date initialExpiration, long intervalDuration, EJBTimerSchedule schedule, javax.ejb.TimerConfig timerConfig)
protected void	_destroyTimers(long id, boolean all)
protected Date	_getNextTimeout(RuntimeTimerState rt) Non-persistent part of the implementation of the getNextTimeout() call
void	addTimerSynchronization(EJBContextImpl context_, String timerId, Date initialExpiration, long containerId, String ownerId)
void	addTimerSynchronization(EJBContextImpl context_, String timerId, Date initialExpiration, long containerId, String ownerId, boolean persistent)
protected void	addToSchedules(long containerId, TimerPrimaryKey timerId, EJBTimerSchedule ts)
protected Date	calcNextFixedRateExpiration(Date initialExpiration, long intervalDuration)
protected Date	calcNextFixedRateExpiration(RuntimeTimerState timerState)
protected boolean	cancelNonPersistentTimer(TimerPrimaryKey timerId)
protected void	cancelTimer(TimerPrimaryKey timerId)
protected void	cancelTimersByKey(long containerId, Object primaryKey) Cancel all timers associated with a particular entity bean identity.
void	cancelTimerSynchronization(EJBContextImpl context_, TimerPrimaryKey timerId, long containerId, String ownerId)
protected javax.ejb.EJBException	createEJBException(Exception ex) Create EJBException using the exception that is passed in
protected void	createSchedules(long containerId, long applicationId, Map<?,List<ScheduledTimerDescriptor>> schedules, Map<TimerPrimaryKey,Method> result, String server_name, boolean startTimers, boolean deploy) Create automatic timers defined by the @Schedule annotation on the EJB bean.
void	createSchedules(long containerId, long applicationId, Map<com.sun.enterprise.deployment.MethodDescriptor,List<ScheduledTimerDescriptor>> methodDescriptorSchedules, String server_name) Create automatic timers defined by the @Schedule annotation on the EJB bean during deployment to a cluster or the first create-application-ref call after deployment to DAS only.
void	createSchedulesOnServer(EjbDescriptor ejbDescriptor, String server_name) Called in a clustered environment to eagerly create automatic persistent timers on the specific server instance.
void	destroyAllTimers(long applicationId) Destroy all timers associated with a particular application.
void	destroyTimers(long containerId) Destroy all timers associated with a particular ejb container This is typically called when an ejb is undeployed.
protected void	expungeTimer(TimerPrimaryKey timerId, boolean removeTimerBean) Remove all traces of a timer.
protected BaseContainer	getContainer(long containerId)
static EJBTimerService	getEJBTimerService()
static EJBTimerService	getEJBTimerService(String target)
static EJBTimerService	getEJBTimerService(String target, boolean force)
protected Serializable	getInfo(TimerPrimaryKey timerId)
protected long	getMaxRedeliveries()
protected Date	getNextScheduledTimeout(EJBTimerSchedule ts) Returns next schedule-based timeout or null if such schedule will not expire again.
protected Date	getNextTimeout(TimerPrimaryKey timerId) Return next planned timeout for this timer.
Set<TimerPrimaryKey>	getNonPersistentActiveTimerIdsByThisServer()
protected RuntimeTimerState	getNonPersistentTimer(TimerPrimaryKey timerId)
String	getOwnerIdOfThisServer() Return the ownerId of the server instance in which we are running.
ClassLoader	getTimerClassLoader(long containerId) Get the application class loader for the timed object that created a given timer.
protected Collection<TimerPrimaryKey>	getTimerIds(Collection<Long> containerIds)
protected Collection<TimerPrimaryKey>	getTimerIds(long containerId, Object timedObjectPrimaryKey) Called by EJBTimerServiceWrapper when caller calls getTimers.
protected EJBTimerSchedule	getTimerSchedule(TimerPrimaryKey timerId) Called by #getScheduleExpression and #isCalendarTimer
protected RuntimeTimerState	getTimerState(TimerPrimaryKey timerId)
static EJBTimerService	getValidEJBTimerService()
protected boolean	isCancelledByAnotherInstance(RuntimeTimerState timerState) For a non-persistent timer, it's not possible to be cancelled by another server instance
static boolean	isEJBTimerServiceLoaded()
boolean	isPersistent()
protected boolean	isPersistent(TimerPrimaryKey timerId)
protected boolean	isValidTimerForThisServer(TimerPrimaryKey timerId, RuntimeTimerState timerState) Non-persistent timers are always valid because to be executed on this server instance.
String[]	listTimers(String[] serverIds) Provide a count of timers owned by each server.
int	migrateTimers(String fromOwnerId) Called by CLI.
static void	onShutdown() Called from TimerBean PreDestroy
protected Map<TimerPrimaryKey,Method>	recoverAndCreateSchedules(long containerId, long applicationId, Map<Method,List<ScheduledTimerDescriptor>> schedules, boolean deploy) Create automatic non-persistent timers defined by the @Schedule annotation on the EJB bean.
protected boolean	redeliverTimeout(RuntimeTimerState timerState)
protected void	resetEJBTimers(String target) Called at server startup *after* user apps have been re-activated to restart any active EJB timers or cleanup old timers.
protected void	resetLastExpiration(TimerPrimaryKey timerId, RuntimeTimerState timerState) Nothing special to do for non-persistent timers
protected void	scheduleTask(TimerPrimaryKey timerId, Date expiration)
protected static void	setEJBTimerService(EJBTimerService es)
protected boolean	stopOnFailure()
protected void	stopTimers(long containerId) Remove from the cache and stop all timers associated with a particular ejb container and known to this server instance.
protected void	stopTimers(Set<TimerPrimaryKey> timerIds)
protected boolean	timerExists(TimerPrimaryKey timerId)
static String	timerStateToString(int state)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ejbContainerUtil

protected EjbContainerUtil ejbContainerUtil

isDas

protected boolean isDas

ownerIdOfThisServer_

protected String ownerIdOfThisServer_

timerCache_

protected EJBTimerService.TimerCache timerCache_

totalTimedObjectsInitialized_

protected long totalTimedObjectsInitialized_

STATE_ACTIVE

public static final int STATE_ACTIVE

See Also:

Constant Field Values

STATE_CANCELLED

public static final int STATE_CANCELLED

See Also:

Constant Field Values

Constructor Detail

EJBTimerService

protected EJBTimerService()
                   throws Exception

Throws:

Exception

Method Detail

setEJBTimerService

protected static void setEJBTimerService(EJBTimerService es)

getEJBTimerService

public static EJBTimerService getEJBTimerService()

getValidEJBTimerService

public static EJBTimerService getValidEJBTimerService()

isEJBTimerServiceLoaded

public static boolean isEJBTimerServiceLoaded()

getEJBTimerService

public static EJBTimerService getEJBTimerService(String target)

getEJBTimerService

public static EJBTimerService getEJBTimerService(String target,
                                 boolean force)

getOwnerIdOfThisServer

public String getOwnerIdOfThisServer()

Return the ownerId of the server instance in which we are running.

listTimers

public String[] listTimers(String[] serverIds)

Provide a count of timers owned by each server. Persistence timers are unknown to non-persistent timer service

migrateTimers

public int migrateTimers(String fromOwnerId)

Called by CLI. Take ownership of another server's timers.

createEJBException

protected javax.ejb.EJBException createEJBException(Exception ex)

Create EJBException using the exception that is passed in

resetEJBTimers

protected void resetEJBTimers(String target)

Called at server startup *after* user apps have been re-activated to restart any active EJB timers or cleanup old timers. No-op for non-persitent timers

addToSchedules

protected void addToSchedules(long containerId,
                  TimerPrimaryKey timerId,
                  EJBTimerSchedule ts)

destroyTimers

public void destroyTimers(long containerId)

Destroy all timers associated with a particular ejb container This is typically called when an ejb is undeployed. It expunges all timers whose timed object matches the given container. In the case of an entity bean container, all timers associated with any of that container's entity bean identities will be destroyed. This action *can not* be rolled back.

destroyAllTimers

public void destroyAllTimers(long applicationId)

Destroy all timers associated with a particular application. This is called when an application is undeployed. It expunges all timers whose timed object matches the given application. In the case of an entity bean container, all timers associated with any of that container's entity bean identities will be destroyed. This action *can not* be rolled back.

_destroyTimers

protected void _destroyTimers(long id,
                  boolean all)

stopTimers

protected void stopTimers(long containerId)

Remove from the cache and stop all timers associated with a particular ejb container and known to this server instance. This is typically called when an ejb is disabled or on a server shutdown to avoid accidentally removing a valid timer. This is also called when an ejb is disabled as part of an undeploy. Removal of the associated timer from the database is done as the last step of undeployment.

stopTimers

protected void stopTimers(Set<TimerPrimaryKey> timerIds)

scheduleTask

protected void scheduleTask(TimerPrimaryKey timerId,
                Date expiration)

calcNextFixedRateExpiration

protected Date calcNextFixedRateExpiration(RuntimeTimerState timerState)

calcNextFixedRateExpiration

protected Date calcNextFixedRateExpiration(Date initialExpiration,
                               long intervalDuration)

expungeTimer

protected void expungeTimer(TimerPrimaryKey timerId,
                boolean removeTimerBean)

Remove all traces of a timer. This should be written defensively so that if expunge is called multiple times for the same timer id, the second, third, fourth, etc. calls will not cause exceptions.

_createTimer

protected void _createTimer(TimerPrimaryKey timerId,
                long containerId,
                long applicationId,
                Object timedObjectPrimaryKey,
                String server_name,
                Date initialExpiration,
                long intervalDuration,
                EJBTimerSchedule schedule,
                javax.ejb.TimerConfig timerConfig)
                     throws Exception

Parameters:

timedObjectPrimaryKey - can be null if timed object is not an entity bean.

Throws:

Exception

recoverAndCreateSchedules

protected Map<TimerPrimaryKey,Method> recoverAndCreateSchedules(long containerId,
                                                    long applicationId,
                                                    Map<Method,List<ScheduledTimerDescriptor>> schedules,
                                                    boolean deploy)

Create automatic non-persistent timers defined by the @Schedule annotation on the EJB bean. Recover part is a no-op in thise case.

Returns:

a Map of created timers, where the key is TimerPrimaryKey and the value is the Method to be executed by the container when the timer with this PK times out.

createSchedulesOnServer

public void createSchedulesOnServer(EjbDescriptor ejbDescriptor,
                           String server_name)

Called in a clustered environment to eagerly create automatic persistent timers on the specific server instance. In a EJB Lite distribution if there is at least one persistent automatic timer defined, this method will fail with a RuntimeException.

createSchedules

public void createSchedules(long containerId,
                   long applicationId,
                   Map<com.sun.enterprise.deployment.MethodDescriptor,List<ScheduledTimerDescriptor>> methodDescriptorSchedules,
                   String server_name)

Create automatic timers defined by the @Schedule annotation on the EJB bean during deployment to a cluster or the first create-application-ref call after deployment to DAS only. Only persistent schedule based timers for the containerId that has no timers associated with it, will be created. And no timers will be scheduled.

createSchedules

protected void createSchedules(long containerId,
                   long applicationId,
                   Map<?,List<ScheduledTimerDescriptor>> schedules,
                   Map<TimerPrimaryKey,Method> result,
                   String server_name,
                   boolean startTimers,
                   boolean deploy)
                        throws Exception

Create automatic timers defined by the @Schedule annotation on the EJB bean. XXX??? If this method is called on a deploy in a clustered deployment, only persistent schedule based timers will be created. And no timers will be scheduled. If it is called from deploy on a non-clustered instance, both persistent and non-persistent timers will be created. Otherwise only non-persistent timers are created by this method.

Throws:

Exception

getTimerIds

protected Collection<TimerPrimaryKey> getTimerIds(long containerId,
                                      Object timedObjectPrimaryKey)

Called by EJBTimerServiceWrapper when caller calls getTimers.

Parameters:

containerId - the id of the EJB which owns the timers

timedObjectPrimaryKey - can be null if not entity bean

Returns:

Collection of Timer Ids.

getTimerIds

protected Collection<TimerPrimaryKey> getTimerIds(Collection<Long> containerIds)

Parameters:

containerIds - the EJBs which own the timers

Returns:

Collection of Timer Ids.

getTimerClassLoader

public ClassLoader getTimerClassLoader(long containerId)

Get the application class loader for the timed object that created a given timer.

getTimerState

protected RuntimeTimerState getTimerState(TimerPrimaryKey timerId)

getNonPersistentActiveTimerIdsByThisServer

public Set<TimerPrimaryKey> getNonPersistentActiveTimerIdsByThisServer()

cancelTimersByKey

protected void cancelTimersByKey(long containerId,
                     Object primaryKey)

Cancel all timers associated with a particular entity bean identity. This is typically called when an entity bean is removed. Note that this action falls under the normal EJB Timer removal semantics, which means it can be rolled back if the transaction rolls back.

cancelTimer

protected void cancelTimer(TimerPrimaryKey timerId)
                    throws javax.ejb.FinderException,
                           Exception

Throws:

javax.ejb.FinderException

Exception

cancelNonPersistentTimer

protected boolean cancelNonPersistentTimer(TimerPrimaryKey timerId)
                                    throws javax.ejb.FinderException,
                                           Exception

Throws:

javax.ejb.FinderException

Exception

getNextTimeout

protected Date getNextTimeout(TimerPrimaryKey timerId)
                       throws javax.ejb.FinderException

Return next planned timeout for this timer. We have a fair amount of leeway regarding the consistency of this information. We should strive to detect the case where the timer no longer exists. However, since the current timer instance may not even own this timer, it's difficult to know the exact time of delivery in another server instance. In the case of single-action timers, we return the expiration time that was provided upon timer creation. For periodic timers, we can derive the next scheduled fixed rate expiration based on the initial expiration and the interval.

Throws:

javax.ejb.FinderException

_getNextTimeout

protected Date _getNextTimeout(RuntimeTimerState rt)

Non-persistent part of the implementation of the getNextTimeout() call

getInfo

protected Serializable getInfo(TimerPrimaryKey timerId)
                        throws javax.ejb.FinderException

Throws:

javax.ejb.FinderException

isPersistent

protected boolean isPersistent(TimerPrimaryKey timerId)
                        throws javax.ejb.FinderException

Throws:

javax.ejb.FinderException

timerExists

protected boolean timerExists(TimerPrimaryKey timerId)

getTimerSchedule

protected EJBTimerSchedule getTimerSchedule(TimerPrimaryKey timerId)
                                     throws javax.ejb.FinderException

Called by #getScheduleExpression and #isCalendarTimer

Throws:

javax.ejb.FinderException

getNonPersistentTimer

protected RuntimeTimerState getNonPersistentTimer(TimerPrimaryKey timerId)
                                           throws javax.ejb.FinderException

Throws:

javax.ejb.FinderException

getContainer

protected BaseContainer getContainer(long containerId)

isCancelledByAnotherInstance

protected boolean isCancelledByAnotherInstance(RuntimeTimerState timerState)

For a non-persistent timer, it's not possible to be cancelled by another server instance

redeliverTimeout

protected boolean redeliverTimeout(RuntimeTimerState timerState)

Returns:

true if this timer should be redelivered

stopOnFailure

protected boolean stopOnFailure()

isValidTimerForThisServer

protected boolean isValidTimerForThisServer(TimerPrimaryKey timerId,
                                RuntimeTimerState timerState)

Non-persistent timers are always valid because to be executed on this server instance.

resetLastExpiration

protected void resetLastExpiration(TimerPrimaryKey timerId,
                       RuntimeTimerState timerState)

Nothing special to do for non-persistent timers

getMaxRedeliveries

protected long getMaxRedeliveries()

addTimerSynchronization

public void addTimerSynchronization(EJBContextImpl context_,
                           String timerId,
                           Date initialExpiration,
                           long containerId,
                           String ownerId)
                             throws Exception

Throws:

Exception

addTimerSynchronization

public void addTimerSynchronization(EJBContextImpl context_,
                           String timerId,
                           Date initialExpiration,
                           long containerId,
                           String ownerId,
                           boolean persistent)
                             throws Exception

Throws:

Exception

cancelTimerSynchronization

public void cancelTimerSynchronization(EJBContextImpl context_,
                              TimerPrimaryKey timerId,
                              long containerId,
                              String ownerId)
                                throws Exception

Throws:

Exception

getNextScheduledTimeout

protected Date getNextScheduledTimeout(EJBTimerSchedule ts)

Returns next schedule-based timeout or null if such schedule will not expire again.

isPersistent

public boolean isPersistent()

onShutdown

public static void onShutdown()

Called from TimerBean PreDestroy

timerStateToString

public static String timerStateToString(int state)