org.apache.turbine.services.schedule
Class TurbineSchedulerService

java.lang.Object
  org.apache.turbine.services.BaseInitable
      org.apache.turbine.services.BaseService
          org.apache.turbine.services.TurbineBaseService
              org.apache.turbine.services.schedule.TurbineSchedulerService

All Implemented Interfaces:

Initable, ScheduleService, Service

Direct Known Subclasses:

TurbineNonPersistentSchedulerService

public class TurbineSchedulerService

extends TurbineBaseService

implements ScheduleService

Service for a cron like scheduler.

Version:

$Id: TurbineSchedulerService.java 264148 2005-08-29 14:21:04Z henning $

Author:

Dave Bryson, Quinton McCombs

Nested Class Summary

protected class

TurbineSchedulerService.MainLoop Inner class.

Field Summary

protected TurbineSchedulerService.MainLoop	mainLoop The main loop for starting jobs.
protected JobQueue	scheduleQueue The queue
protected java.lang.Thread	thread The thread used to process commands.

Fields inherited from class org.apache.turbine.services.BaseService

configuration, name, serviceBroker

Fields inherited from class org.apache.turbine.services.BaseInitable

initableBroker, isInitialized

Fields inherited from interface org.apache.turbine.services.schedule.ScheduleService

INTIALLY_ACTIVE, LOGGER_NAME, SERVICE_NAME

Constructor Summary

TurbineSchedulerService()
Creates a new instance.

Method Summary

void	addJob(JobEntry je) Add a new job to the queue.
JobEntry	getJob(int oid) Get a specific Job from Storage.
java.lang.Thread	getThread() Return the thread being used to process commands, or null if there is no such thread.
void	init() Initializes the SchedulerService.
void	init(javax.servlet.ServletConfig config) Deprecated. use init() instead.
boolean	isEnabled() Determines if the scheduler service is currently enabled.
java.util.List	listJobs() List jobs in the queue.
void	removeJob(JobEntry je) Remove a job from the queue.
void	restart() Start (or restart) a thread to process commands, or wake up an existing thread if one is already running.
protected void	setEnabled(boolean enabled) Sets the enabled status of the scheduler
void	shutdown() Shutdowns the service.
void	startScheduler() Starts or restarts the scheduler if not already running.
void	stopScheduler() Stops the scheduler if it is currently running.
void	updateJob(JobEntry je) Add or update a job.

Methods inherited from class org.apache.turbine.services.TurbineBaseService

init, init

Methods inherited from class org.apache.turbine.services.BaseService

getConfiguration, getName, getProperties, getServiceBroker, setName, setServiceBroker

Methods inherited from class org.apache.turbine.services.BaseInitable

getInit, getInitableBroker, setInit, setInitableBroker

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.turbine.services.Service

getConfiguration, getName, getProperties, setName, setServiceBroker

Methods inherited from interface org.apache.turbine.services.Initable

getInit, init, setInitableBroker

Field Detail

scheduleQueue

protected JobQueue scheduleQueue

The queue

mainLoop

protected TurbineSchedulerService.MainLoop mainLoop

The main loop for starting jobs.

thread

protected java.lang.Thread thread

The thread used to process commands.

Constructor Detail

TurbineSchedulerService

public TurbineSchedulerService()

Creates a new instance.

Method Detail

init

public void init()
          throws InitializationException

Initializes the SchedulerService.

Specified by:

init in interface Initable

Overrides:

init in class TurbineBaseService

Throws:

InitializationException - Something went wrong in the init stage

init

public void init(javax.servlet.ServletConfig config)
          throws InitializationException

Deprecated. use init() instead.

Called the first time the Service is used.
Load all the jobs from cold storage. Add jobs to the queue (sorted in ascending order by runtime) and start the scheduler thread.

Overrides:

init in class TurbineBaseService

Parameters:

config - A ServletConfig.

Throws:

InitializationException - if initialization of this class was not successful.

shutdown

public void shutdown()

Shutdowns the service. This methods interrupts the housekeeping thread.

Specified by:

shutdown in interface Initable

Overrides:

shutdown in class TurbineBaseService

getJob

public JobEntry getJob(int oid)
                throws TurbineException

Get a specific Job from Storage.

Specified by:

getJob in interface ScheduleService

Parameters:

oid - The int id for the job.

Returns:

A JobEntry.

Throws:

TurbineException - job could not be retreived.

addJob

public void addJob(JobEntry je)
            throws TurbineException

Add a new job to the queue.

Specified by:

addJob in interface ScheduleService

Parameters:

je - A JobEntry with the job to add.

Throws:

TurbineException - job could not be added

removeJob

public void removeJob(JobEntry je)
               throws TurbineException

Remove a job from the queue.

Specified by:

removeJob in interface ScheduleService

Parameters:

je - A JobEntry with the job to remove.

Throws:

TurbineException - job could not be removed

updateJob

public void updateJob(JobEntry je)
               throws TurbineException

Add or update a job.

Specified by:

updateJob in interface ScheduleService

Parameters:

je - A JobEntry with the job to modify

Throws:

TurbineException - job could not be updated

listJobs

public java.util.List listJobs()

List jobs in the queue. This is used by the scheduler UI.

Specified by:

listJobs in interface ScheduleService

Returns:

A List of jobs.

setEnabled

protected void setEnabled(boolean enabled)

Sets the enabled status of the scheduler

Parameters:

enabled -

isEnabled

public boolean isEnabled()

Determines if the scheduler service is currently enabled.

Specified by:

isEnabled in interface ScheduleService

Returns:

Status of the scheduler service.

startScheduler

public void startScheduler()

Starts or restarts the scheduler if not already running.

Specified by:

startScheduler in interface ScheduleService

stopScheduler

public void stopScheduler()

Stops the scheduler if it is currently running.

Specified by:

stopScheduler in interface ScheduleService

getThread

public java.lang.Thread getThread()

Return the thread being used to process commands, or null if there is no such thread. You can use this to invoke any special methods on the thread, for example, to interrupt it.

Returns:

A Thread.

restart

public void restart()

Start (or restart) a thread to process commands, or wake up an existing thread if one is already running. This method can be invoked if the background thread crashed due to an unrecoverable exception in an executed command.