com.bbn.openmap.layer.vpf
Class RunQueue

java.lang.Object
  |
  +--java.lang.Thread
        |
        +--com.bbn.openmap.layer.vpf.RunQueue

All Implemented Interfaces:

java.lang.Runnable

public class RunQueue

extends java.lang.Thread

Implement a very basic thread scheduling mechanism. TerminatingRunnable objects get added to the queue. As the thread gets cpu time, it will sequentially dequeue and run the objects in the queue in a LIFO order. Duplicates are allowed in the queue. Run will get called exactly once for each enqueue call. Only one thread will run at a time. (The next object won't run until the previous one completes.)

See Also:

Runnable.run()

Field Summary

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

RunQueue()
default constructor.

RunQueue(boolean isDaemon, int priority, boolean autoStart)
construct a thread in the default ThreadGroup with a few options set

RunQueue(java.lang.ThreadGroup tg)
construct this thread in a particular ThreadGroup

RunQueue(java.lang.ThreadGroup tg, boolean isDaemon, int priority, boolean autoStart)
construct a thread in the default ThreadGroup with a few options set

Method Summary

void	enqueue(TerminatingRunnable r) Add an object to the queue of threads to run
void	run() start going.

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

Constructor Detail

RunQueue

public RunQueue()

default constructor. priority and daemon status inherited from the calling thread. This thread is NOT started

RunQueue

public RunQueue(java.lang.ThreadGroup tg)

construct this thread in a particular ThreadGroup

Parameters:

tg - the ThreadGroup to be in. null means the current ThreadGroup

RunQueue

public RunQueue(boolean isDaemon,
                int priority,
                boolean autoStart)

construct a thread in the default ThreadGroup with a few options set

Parameters:

isDaemon - true means be a daemon thread, false means don't.

priority - the value to use when calling setPriority

autoStart - true means call this.start()

See Also:

Thread.start()

RunQueue

public RunQueue(java.lang.ThreadGroup tg,
                boolean isDaemon,
                int priority,
                boolean autoStart)

construct a thread in the default ThreadGroup with a few options set

Parameters:

tg - the ThreadGroup to be in

isDaemon - true means be a daemon thread, false means don't.

priority - the value to use when calling setPriority

autoStart - true means call this.start()

See Also:

Thread.start()

Method Detail

run

public void run()

start going. This function locks the queue, dequeues and item, unlocks the queue, and calls run on the object that was dequeued. if no object was on the queue, it waits on the queue. this function never exits.

Specified by:

run in interface java.lang.Runnable

Overrides:

run in class java.lang.Thread

enqueue

public void enqueue(TerminatingRunnable r)

Add an object to the queue of threads to run

Parameters:

r - the object to add