net.sf.farrago.util
Class FarragoTimerTask

java.lang.Object
  java.util.TimerTask
      net.sf.farrago.util.FarragoTimerTask

All Implemented Interfaces:

Runnable

Direct Known Subclasses:

FarragoDatabase.CheckpointTask, FarragoDatabase.WatchdogTask, FarragoTimerTest.BadTask, FarragoTimerTest.GoodTask

public abstract class FarragoTimerTask
extends TimerTask

FarragoTimerTask refines TimerTask to guarantee safety based on the way Farrago runs timers (see FarragoTimerAllocation).

TODO jvs 13-Aug-2007: add a facility for subclasses to be able to distinguish fatal exceptions from recoverable ones, so that timers can be allowed to keep running after an exception.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/util/FarragoTimerTask.java#4 $

Author:

John Sichi

Field Summary

private Logger

tracer

Constructor Summary

protected

FarragoTimerTask(Logger tracer) Creates a new FarragoTimerTask.

Method Summary

void	run()
protected abstract void	runTimer() Runs the timer action as specified by subclass.

Methods inherited from class java.util.TimerTask

cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object

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

Field Detail

tracer

private final Logger tracer

Constructor Detail

FarragoTimerTask

protected FarragoTimerTask(Logger tracer)

Creates a new FarragoTimerTask.

Parameters:

tracer - logger on which to trace exceptions

Method Detail

run

public final void run()

Specified by:

run in interface Runnable

Specified by:

run in class TimerTask

runTimer

protected abstract void runTimer()

Runs the timer action as specified by subclass.