groovyx.gpars.scheduler

Class Scheduler

java.lang.Object

groovyx.gpars.scheduler.Scheduler

All Implemented Interfaces:

Pool

public final class Scheduler
extends java.lang.Object
implements Pool

Prototype of self-regulated thread pooled scheduler

Self regulation happened according to following rules:

• worker thread, which had nothing to do 10 seconds dies
• if no tasks were taken for processing during last 0.5sec new worker starts

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	Scheduler.WatchdogThread
private class	Scheduler.WorkerThread

Field Summary

Fields

Modifier and Type	Field and Description
private long	lastTaskPoke
private static long	POKE_INTERVAL
private java.util.concurrent.BlockingQueue<java.lang.Runnable>	queue
private long	schedulerTime
(package private) static java.lang.RuntimeException	TERMINATE
private boolean	terminating
private java.util.concurrent.atomic.AtomicInteger	threadCount

Fields inherited from interface groovyx.gpars.scheduler.Pool

POOL_SIZE_MUST_BE_A_POSITIVE_NUMBER, UNCAUGHT_EXCEPTION_OCCURRED_IN_GPARS_POOL

Constructor Summary

Constructors

Constructor and Description
Scheduler()
Scheduler(int coreSize)

Method Summary

Methods

Modifier and Type	Method and Description
void	execute(java.lang.Runnable task) schedules a new task for processing with the pool
int	getPoolSize() Retrieves the current thread pool size
java.lang.Runnable	loop(java.lang.Runnable operation)
void	resetDefaultSize() Sets the pool size to the default
void	resize(int poolSize) Resizes the thread pool to the specified value
void	shutdown() Gently stops the pool
private void	startNewThread()

Methods inherited from class java.lang.Object

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

Field Detail

queue

private final java.util.concurrent.BlockingQueue<java.lang.Runnable> queue

threadCount

private final java.util.concurrent.atomic.AtomicInteger threadCount

lastTaskPoke

private volatile long lastTaskPoke

schedulerTime

private volatile long schedulerTime

terminating

private volatile boolean terminating

TERMINATE

static final java.lang.RuntimeException TERMINATE

POKE_INTERVAL

private static final long POKE_INTERVAL

See Also:

Constant Field Values

Constructor Detail

Scheduler

public Scheduler()

Scheduler

public Scheduler(int coreSize)

Method Detail

execute

public void execute(java.lang.Runnable task)

Description copied from interface: Pool

schedules a new task for processing with the pool

Specified by:

execute in interface Pool

Parameters:

task - The task to schedule

loop

public java.lang.Runnable loop(java.lang.Runnable operation)

startNewThread

private void startNewThread()

resize

public void resize(int poolSize)

Description copied from interface: Pool

Resizes the thread pool to the specified value

Specified by:

resize in interface Pool

Parameters:

poolSize - The new pool size

resetDefaultSize

public void resetDefaultSize()

Description copied from interface: Pool

Sets the pool size to the default

Specified by:

resetDefaultSize in interface Pool

getPoolSize

public int getPoolSize()

Retrieves the current thread pool size

Specified by:

getPoolSize in interface Pool

Returns:

The pool size

shutdown

public void shutdown()

Description copied from interface: Pool

Gently stops the pool

Specified by:

shutdown in interface Pool