Package org.apache.log4j.scheduler
Class Scheduler
- java.lang.Object
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- java.lang.Thread
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- org.apache.log4j.scheduler.Scheduler
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- All Implemented Interfaces:
Runnable
public class Scheduler extends Thread
A simple but still useful implementation of a Scheduler (in memory only). This implementation will work very well when the number of scheduled job is small, say less than 100 jobs. If a larger number of events need to be scheduled, than a better adapted data structure for the jobList can give improved performance.- Author:
- Ceki
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Nested Class Summary
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Nested classes/interfaces inherited from class java.lang.Thread
Thread.State, Thread.UncaughtExceptionHandler
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Field Summary
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Fields inherited from class java.lang.Thread
MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY
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Constructor Summary
Constructors Constructor Description Scheduler()Create new instance.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description booleanchangePeriod(Job job, long newPeriod)Change the period of a job.booleandelete(Job job)Delete the given job.voidrun()Run scheduler.voidschedule(Job job, long desiredTime)Schedule aJobfor execution at system time given by thedesiredTimeparameter.voidschedule(Job job, long desiredTime, long period)Schedule aJobfor execution at system time given by thedesiredTimeparameter.voidshutdown()Shut down scheduler.-
Methods inherited from class java.lang.Thread
activeCount, checkAccess, clone, countStackFrames, currentThread, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, onSpinWait, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, suspend, toString, yield
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Method Detail
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delete
public boolean delete(Job job)
Delete the given job.- Parameters:
job- job.- Returns:
- true if the job could be deleted, and false if the job could not be found or if the Scheduler is about to shutdown in which case deletions are not permitted.
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schedule
public void schedule(Job job, long desiredTime)
Schedule aJobfor execution at system time given by thedesiredTimeparameter.- Parameters:
job- job to schedule.desiredTime- desired time of execution.
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schedule
public void schedule(Job job, long desiredTime, long period)
Schedule aJobfor execution at system time given by thedesiredTimeparameter. The job will be rescheduled. It will execute with a frequency determined by the period parameter.- Parameters:
job- job to schedule.desiredTime- desired time of execution.period- repeat period.
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changePeriod
public boolean changePeriod(Job job, long newPeriod)
Change the period of a job. The original job must exist for its period to be changed. The method returns true if the period could be changed, and false otherwise.- Parameters:
job- job.newPeriod- new repeat period.- Returns:
- true if period could be changed.
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shutdown
public void shutdown()
Shut down scheduler.
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