java.util
Class TimerThread

java.lang.Object
  java.lang.Thread
      java.util.TimerThread

All Implemented Interfaces:

Runnable

class TimerThread

extends Thread

This "helper class" implements the timer's task execution thread, which waits for tasks on the timer queue, executions them when they fire, reschedules repeating tasks, and removes cancelled tasks and spent non-repeating tasks from the queue.

Field Summary

(package private) boolean	newTasksMayBeScheduled This flag is set to false by the reaper to inform us that there are no more live references to our Timer object.
private TaskQueue	queue Our Timer's queue.

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

(package private)

TimerThread(TaskQueue queue)

Method Summary

private void	mainLoop() The main timer loop.
void	run() If this thread was constructed using a separate Runnable run object, then that Runnable object's run method is called; otherwise, this method does nothing and returns.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, holdsLock, 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

newTasksMayBeScheduled

boolean newTasksMayBeScheduled

This flag is set to false by the reaper to inform us that there are no more live references to our Timer object. Once this flag is true and there are no more tasks in our queue, there is no work left for us to do, so we terminate gracefully. Note that this field is protected by queue's monitor!

queue

private TaskQueue queue

Our Timer's queue. We store this reference in preference to a reference to the Timer so the reference graph remains acyclic. Otherwise, the Timer would never be garbage-collected and this thread would never go away.

Constructor Detail

TimerThread

TimerThread(TaskQueue queue)

Method Detail

run

public void run()

Description copied from class: Thread

If this thread was constructed using a separate Runnable run object, then that Runnable object's run method is called; otherwise, this method does nothing and returns.

Subclasses of Thread should override this method.

Specified by:

run in interface Runnable

Overrides:

run in class Thread

See Also:

Thread.start(), Thread.stop(), Thread.Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String), Runnable.run()

mainLoop

private void mainLoop()

The main timer loop. (See class comment.)