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org.apache.avalon.cornerstone.blocks.scheduler
Class DefaultTimeScheduler

java.lang.Object
  org.apache.avalon.framework.logger.AbstractLogEnabled
      org.apache.avalon.cornerstone.blocks.scheduler.DefaultTimeScheduler

All Implemented Interfaces:

Disposable, LogEnabled, MonitorableTimeSchedulerMBean, java.lang.Runnable, Serviceable, Startable, TimeScheduler

Direct Known Subclasses:

MonitorableTimeScheduler

public class DefaultTimeScheduler

extends AbstractLogEnabled

implements TimeScheduler, Serviceable, Startable, Disposable, java.lang.Runnable, MonitorableTimeSchedulerMBean

Default implementation of TimeScheduler service.

Author:

Avalon Development Team

Field Summary

Fields inherited from interface org.apache.avalon.cornerstone.services.scheduler.TimeScheduler

ROLE

Constructor Summary

DefaultTimeScheduler()

Method Summary

void	addTrigger(java.lang.String name, TimeTrigger trigger, Target target) Schedule a time based trigger.
void	addTriggerFailureListener(TriggerFailureListener listener) Add a trigger failure listener
void	dispose() The dispose operation is called at the end of a components lifecycle.
protected void	doRunEntry(TimeScheduledEntry entry) Helper method delegated to to run in a separate thread.
java.util.Collection	getEntries() Return a collection of the triggerable names.
protected TimeScheduledEntry	getEntry(java.lang.String name) Retrieve entry from set.
protected java.util.Map	getEntryMap()
protected TimeScheduledEntry	getNextEntry() Retrieve next valid entry.
protected PriorityQueue	getPriorityQueue()
protected ThreadManager	getThreadManager()
protected java.util.List	getTriggerFailureListeners()
protected boolean	isRunning()
protected void	notifyFailedTriggers(java.lang.Throwable t)
void	removeTrigger(java.lang.String name) Remove a scheduled trigger by name.
void	removeTriggerFailureListener(TriggerFailureListener listener) Remove a trigger failure listener
protected boolean	rescheduleEntry(TimeScheduledEntry timeEntry, boolean clone) Reschedule an entry.
void	resetTrigger(java.lang.String name) Force a trigger time to be recalculated.
void	run() Entry point for thread that monitors entrys and triggers entrys when necessary.
protected void	runEntry(TimeScheduledEntry entry) Run entry in a separate thread and reschedule it.
void	service(ServiceManager serviceManager) Supply of the service manager to the component.
protected void	setRunning(boolean running)
void	start() Starts the component.
void	stop() Stops the component.

Methods inherited from class org.apache.avalon.framework.logger.AbstractLogEnabled

enableLogging, getLogger, setupLogger, setupLogger, setupLogger

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultTimeScheduler

public DefaultTimeScheduler()

Method Detail

getThreadManager

protected final ThreadManager getThreadManager()

isRunning

protected final boolean isRunning()

setRunning

protected final void setRunning(boolean running)

getTriggerFailureListeners

protected final java.util.List getTriggerFailureListeners()

getEntryMap

protected final java.util.Map getEntryMap()

getPriorityQueue

protected final PriorityQueue getPriorityQueue()

service

public void service(ServiceManager serviceManager)
             throws ServiceException

Supply of the service manager to the component.

Specified by:

service in interface Serviceable

Parameters:

serviceManager - the service manager

Throws:

ServiceException - if an error occurs

dispose

public void dispose()

Description copied from interface: Disposable

The dispose operation is called at the end of a components lifecycle. This method will be called after Startable.stop() method (if implemented by component). Components use this method to release and destroy any resources that the Component owns.

Specified by:

dispose in interface Disposable

start

public void start()
           throws java.lang.Exception

Description copied from interface: Startable

Starts the component.

Specified by:

start in interface Startable

Throws:

java.lang.Exception - if Component can not be started

stop

public void stop()

Description copied from interface: Startable

Stops the component.

Specified by:

stop in interface Startable

run

public void run()

Entry point for thread that monitors entrys and triggers entrys when necessary.

Specified by:

run in interface java.lang.Runnable

addTriggerFailureListener

public void addTriggerFailureListener(TriggerFailureListener listener)

Add a trigger failure listener

Specified by:

addTriggerFailureListener in interface TimeScheduler

Parameters:

listener - The listener

removeTriggerFailureListener

public void removeTriggerFailureListener(TriggerFailureListener listener)

Remove a trigger failure listener

Specified by:

removeTriggerFailureListener in interface TimeScheduler

Parameters:

listener - The listener

addTrigger

public void addTrigger(java.lang.String name,
                       TimeTrigger trigger,
                       Target target)

Schedule a time based trigger. Note that if a TimeTrigger already has same name then it is removed.

Specified by:

addTrigger in interface TimeScheduler

Parameters:

name - the name of the trigger

trigger - the trigger

target - the target

removeTrigger

public void removeTrigger(java.lang.String name)
                   throws java.util.NoSuchElementException

Remove a scheduled trigger by name.

Specified by:

removeTrigger in interface TimeScheduler

Parameters:

name - the name of the trigger

Throws:

java.util.NoSuchElementException - if no trigger exists with that name

resetTrigger

public void resetTrigger(java.lang.String name)
                  throws java.util.NoSuchElementException

Force a trigger time to be recalculated.

Specified by:

resetTrigger in interface TimeScheduler

Parameters:

name - the name of the trigger

Throws:

java.util.NoSuchElementException - if no trigger exists with that name

getEntries

public java.util.Collection getEntries()

Return a collection of the triggerable names.

Specified by:

getEntries in interface MonitorableTimeSchedulerMBean

Returns:

the collection

rescheduleEntry

protected boolean rescheduleEntry(TimeScheduledEntry timeEntry,
                                  boolean clone)

Reschedule an entry. if clone is true then invalidate old version and create a new entry to insert into queue.

Parameters:

timeEntry - the entry

clone - true if new entry is to be created

Returns:

true if added to queue, false if not added

getEntry

protected TimeScheduledEntry getEntry(java.lang.String name)
                               throws java.util.NoSuchElementException

Retrieve entry from set.

Parameters:

name - the name of entry

Returns:

the entry

Throws:

java.util.NoSuchElementException - if no entry is found with that name

runEntry

protected void runEntry(TimeScheduledEntry entry)

Run entry in a separate thread and reschedule it.

Parameters:

entry - the entry to run

doRunEntry

protected void doRunEntry(TimeScheduledEntry entry)

Helper method delegated to to run in a separate thread.

Parameters:

entry - the entry to run

getNextEntry

protected TimeScheduledEntry getNextEntry()

Retrieve next valid entry. It will pop off any invalid entrys until the heap is empty or a valid entry is found.

Returns:

the next valid entry or null if none

notifyFailedTriggers

protected void notifyFailedTriggers(java.lang.Throwable t)