de.bea.domingo.threadpool
Class SimpleThreadPool

java.lang.Object
  de.bea.domingo.threadpool.SimpleThreadPool

All Implemented Interfaces:

ThreadPool, java.lang.Runnable

public final class SimpleThreadPool
extends java.lang.Object
implements java.lang.Runnable, ThreadPool

A simple implementation of a ThreadPool which is constructed with a given number of threads.

Author:

Kurt Riede

Field Summary

static int	DEFAULT_NUM_THREAD Default number of threads in the thread pool.
static int	MAX_WAIT_FOR_STOP Maximum amount of time to wait for a thread to stop.
static int	MAX_WAIT_FOR_TASK Maximum amount of time to wait for a task from the queue in milli seconds.

Constructor Summary

SimpleThreadPool()
Constructor.

SimpleThreadPool(DNotesMonitor monitor)
Constructor.

SimpleThreadPool(DNotesMonitor monitor, int numberOfThreads)
Constructor.

SimpleThreadPool(DNotesMonitor monitor, int numberOfThreads, int threadPriority)
Constructor.

SimpleThreadPool(DNotesMonitor monitor, ThreadFactory threadFactory, int numberOfThreads)
Constructor.

SimpleThreadPool(DNotesMonitor theMonitor, ThreadFactory theThreadFactory, int theNumberOfThreads, int theThreadPriority)
Constructor.

SimpleThreadPool(int numberOfThreads)
Constructor.

SimpleThreadPool(int numberOfThreads, int threadPriority)
Constructor.

Method Summary

int	getRunnableCount() Returns number of runnable objects in the queue.
void	invokeLater(java.lang.Runnable task) Dispatch a new task onto this pool to be invoked asynchronously later.
void	resize(int newSize) Resize the thread pool.
void	run() The method ran by the pool of background threads.
void	stop() Stops the pool.

Methods inherited from class java.lang.Object

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

Field Detail

MAX_WAIT_FOR_TASK

public static final int MAX_WAIT_FOR_TASK

Maximum amount of time to wait for a task from the queue in milli seconds.

See Also:

Constant Field Values

MAX_WAIT_FOR_STOP

public static final int MAX_WAIT_FOR_STOP

Maximum amount of time to wait for a thread to stop.

See Also:

Constant Field Values

DEFAULT_NUM_THREAD

public static final int DEFAULT_NUM_THREAD

Default number of threads in the thread pool.

See Also:

Constant Field Values

Constructor Detail

SimpleThreadPool

public SimpleThreadPool()
                 throws ThreadPoolException

Constructor.

Throws:

ThreadPoolException - if any error occurs during starting threads

SimpleThreadPool

public SimpleThreadPool(DNotesMonitor monitor)
                 throws ThreadPoolException

Constructor.

Parameters:

monitor - the monitor

Throws:

ThreadPoolException - if any error occurs during starting threads

SimpleThreadPool

public SimpleThreadPool(int numberOfThreads)
                 throws ThreadPoolException

Constructor.

Parameters:

numberOfThreads - number of threads in pool

Throws:

ThreadPoolException - if any error occurs during starting threads

SimpleThreadPool

public SimpleThreadPool(DNotesMonitor monitor,
                        int numberOfThreads)
                 throws ThreadPoolException

Constructor.

Parameters:

monitor - ThreadPool Monitor

numberOfThreads - number of threads in pool

Throws:

ThreadPoolException - if any error occurs during starting threads

ThreadPoolException - if any error occurs during starting threads

SimpleThreadPool

public SimpleThreadPool(int numberOfThreads,
                        int threadPriority)
                 throws ThreadPoolException

Constructor.

Parameters:

numberOfThreads - number of threads in pool

threadPriority - priority of threads in pool

Throws:

ThreadPoolException - if any error occurs during starting threads

SimpleThreadPool

public SimpleThreadPool(DNotesMonitor monitor,
                        int numberOfThreads,
                        int threadPriority)
                 throws ThreadPoolException

Constructor.

Parameters:

monitor - ThreadPool Monitor

numberOfThreads - number of threads in pool

threadPriority - priority of threads in pool

Throws:

ThreadPoolException - if any error occurs during starting threads

SimpleThreadPool

public SimpleThreadPool(DNotesMonitor monitor,
                        ThreadFactory threadFactory,
                        int numberOfThreads)
                 throws ThreadPoolException

Constructor.

Parameters:

monitor - ThreadPool Monitor

threadFactory - ThreadFactory to us to create the new Threads

numberOfThreads - number of threads in pool

Throws:

ThreadPoolException - if any error occurs during starting threads

SimpleThreadPool

public SimpleThreadPool(DNotesMonitor theMonitor,
                        ThreadFactory theThreadFactory,
                        int theNumberOfThreads,
                        int theThreadPriority)
                 throws ThreadPoolException

Constructor.

Parameters:

theMonitor - ThreadPool monitor

theThreadFactory - ThreadFactory to us to create the new Threads

theNumberOfThreads - number of threads in pool

theThreadPriority - priority of threads in pool

Throws:

ThreadPoolException - if any error occurs during starting threads

Method Detail

getRunnableCount

public int getRunnableCount()

Returns number of runnable objects in the queue.

Returns:

number of objects in the queue

invokeLater

public void invokeLater(java.lang.Runnable task)

Dispatch a new task onto this pool to be invoked asynchronously later.

Specified by:

invokeLater in interface ThreadPool

Parameters:

task - the task to execute

stop

public void stop()

Description copied from interface: ThreadPool

Stops the pool.

Specified by:

stop in interface ThreadPool

See Also:

ThreadPool.stop()

resize

public void resize(int newSize)
            throws ThreadPoolException

Resize the thread pool.

Specified by:

resize in interface ThreadPool

Parameters:

newSize - new number of threads in the thread pool

Throws:

ThreadPoolException - if any error occurs during starting threads

See Also:

ThreadPool.resize(int)

run

public void run()

The method ran by the pool of background threads.

Specified by:

run in interface java.lang.Runnable