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org.hsqldb.lib

public Class HsqlTaskQueue

Class Inheritance

extends Object

java.lang.Object
org.hsqldb.lib.HsqlTaskQueue

Provides very simple queued execution of Runnable objects in a background thread. The underlying queue is an HsqlDeque instance, an array-based circular queue implementation with automatic capacity expansion.

Author: Campbell Burnet (campbell-burnet@users dot sourceforge.net)
Since: 1.7.2
Version: 2.6.0

Nested and Inner Type Summary

Modifier and Type	Class and Description
protected class	HsqlTaskQueue.TaskRunner

Field Summary

Modifier and Type	Field and Description
protected volatile boolean	isShutdown true if thread should shut down after processing current task.
protected final HsqlDeque<Runnable>	queue
protected static final Runnable	SHUTDOWNTASK Special queue element to signal termination
protected final HsqlTaskQueue.TaskRunner	taskRunner
protected Thread	taskRunnerThread The thread used to process commands

Constructor Summary

Access	Constructor and Description
public	HsqlTaskQueue()

Method Summary

Modifier and Type	Method and Description
protected synchronized void	clearThread()
public void	execute(Runnable command)
public synchronized Thread	getTaskRunnerThread()
public boolean	isShutdown()
public synchronized void	restart()
public synchronized void	shutdownAfterCurrent()
public synchronized void	shutdownAfterQueued()
public synchronized void	shutdownImmediately()

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

isShutdown	back to summary
protected volatile boolean isShutdown true if thread should shut down after processing current task. Once set true, stays true forever

queue	back to summary
protected final HsqlDeque<Runnable> queue

SHUTDOWNTASK	back to summary
protected static final Runnable SHUTDOWNTASK Special queue element to signal termination

taskRunner	back to summary
protected final HsqlTaskQueue.TaskRunner taskRunner

taskRunnerThread	back to summary
protected Thread taskRunnerThread The thread used to process commands

Constructor Detail

HsqlTaskQueue	back to summary
public HsqlTaskQueue()

Method Detail

clearThread	back to summary
protected synchronized void clearThread()

execute	back to summary
public void execute(Runnable command) throws RuntimeException

getTaskRunnerThread	back to summary
public synchronized Thread getTaskRunnerThread()

isShutdown	back to summary
public boolean isShutdown()

restart	back to summary
public synchronized void restart()

shutdownAfterCurrent	back to summary
public synchronized void shutdownAfterCurrent()

shutdownAfterQueued	back to summary
public synchronized void shutdownAfterQueued()

shutdownImmediately	back to summary
public synchronized void shutdownImmediately()

org.hsqldb.lib back to summary

protected Class HsqlTaskQueue.TaskRunner

Class Inheritance

extends Object
implements Runnable

java.lang.Object
org.hsqldb.lib.HsqlTaskQueue.TaskRunner

All Implemented Interfaces

java.lang.Runnable

Constructor Summary

Access	Constructor and Description
protected	TaskRunner()

Method Summary

Modifier and Type	Method and Description
public void	run() Implements java.lang.Runnable.run. Runs this operation.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Constructor Detail

TaskRunner	back to summary
protected TaskRunner()

Method Detail

run

back to summary

public void run()

Implements java.lang.Runnable.run.

Doc from java.lang.Runnable.run.

Runs this operation.