com.perdues
Class Scheduler

java.lang.Object
  |
  +--java.lang.Thread
        |
        +--com.perdues.Scheduler

All Implemented Interfaces:

java.lang.Runnable

public class Scheduler

extends java.lang.Thread

Class to support periodic jobs passed to it as Runnables. This will run each one at fixed intervals given in seconds. Spawns a new Thread for each job it runs. This class's interface is based on com.bitmechanic.util.Scheduler, written by James Cooper.

If you would like to run a task once per minute, implemented by an instance of MyRunnable, you need only do:

   Scheduler.defaultScheduler().scheduleJob(new MyRunnable(), 60);
 

It will run in a new Thread every 60 seconds.

Field Summary

static boolean

debug Turn this flag on to receive debugging information on System.err.

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Scheduler()
Creates but does not start a new Scheduler.

Method Summary

static Scheduler	defaultScheduler() Returns the default Scheduler, creating and starting it if this has not already been done.
int	getJobCount() Returns the number of periodic jobs currently managed by this Scheduler.
void	removeJob(java.lang.Runnable job) Removes a periodic job from the list.
void	run() Implementation of Runnable; not intended to be called directly from user code.
void	scheduleJob(java.lang.Runnable job, int sleepInterval) Adds a Runnable to this Scheduler, to be run every sleepInterval seconds.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setName, setPriority, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

debug

public static boolean debug

Turn this flag on to receive debugging information on System.err.

Constructor Detail

Scheduler

public Scheduler()

Creates but does not start a new Scheduler.

Method Detail

defaultScheduler

public static Scheduler defaultScheduler()

Returns the default Scheduler, creating and starting it if this has not already been done. The default Scheduler runs as a daemon thread. If all "user" (non-daemon) threads exit, the Java VM will exit also.

scheduleJob

public void scheduleJob(java.lang.Runnable job,
                        int sleepInterval)

Adds a Runnable to this Scheduler, to be run every sleepInterval seconds.

removeJob

public void removeJob(java.lang.Runnable job)

Removes a periodic job from the list.

run

public void run()

Implementation of Runnable; not intended to be called directly from user code. This is the main loop; waits for jobs to be ready to run and runs each in its own thread.

Overrides:

run in class java.lang.Thread

getJobCount

public int getJobCount()

Returns the number of periodic jobs currently managed by this Scheduler.