Examples of EDU.oswego.cs.dl.util.concurrent.PooledExecutor

Package EDU.oswego.cs.dl.util.concurrent

Examples of EDU.oswego.cs.dl.util.concurrent.PooledExecutor

EDU.oswego.cs.dl.util.concurrent.PooledExecutor
ialize to use a maximum of 8 threads. static PooledExecutor pool = new PooledExecutor(8); } Here are some sample variants in initialization:
1. Using a bounded buffer of 10 tasks, at least 4 threads (started only when needed due to incoming requests), but allowing up to 100 threads if the buffer gets full.
```
 pool = new PooledExecutor(new BoundedBuffer(10), 100); pool.setMinimumPoolSize(4); 
```
2. Same as (1), except pre-start 9 threads, allowing them to die if they are not used for five minutes.
```
 pool = new PooledExecutor(new BoundedBuffer(10), 100); pool.setMinimumPoolSize(4); pool.setKeepAliveTime(1000 * 60 * 5); pool.createThreads(9); 
```
3. Same as (2) except clients block if both the buffer is full and all 100 threads are busy:
```
 pool = new PooledExecutor(new BoundedBuffer(10), 100); pool.setMinimumPoolSize(4); pool.setKeepAliveTime(1000 * 60 * 5); pool.waitWhenBlocked(); pool.createThreads(9); 
```
4. An unbounded queue serviced by exactly 5 threads:
```
 pool = new PooledExecutor(new LinkedQueue()); pool.setKeepAliveTime(-1); // live forever pool.createThreads(5); 
```
Usage notes.
Pools do not mesh well with using thread-specific storage via java.lang.ThreadLocal. ThreadLocal relies on the identity of a thread executing a particular task. Pools use the same thread to perform different tasks.
If you need a policy not handled by the parameters in this class consider writing a subclass.
Version note: Previous versions of this class relied on ThreadGroups for aggregate control. This has been removed, and the method interruptAll added, to avoid differences in behavior across JVMs.
[ Introduction to this package. ]

     * one.
     *
     * @param maxSize Maximum size of the work executor pool.
     */
    public WorkExecutorPoolImpl(int maxSize) {
        pooledExecutor = new PooledExecutor(new LinkedQueue(), maxSize);
        pooledExecutor.setMinimumPoolSize(maxSize);
        pooledExecutor.waitWhenBlocked();
    }

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     * @param maxSize Maximum size of the work executor pool.
     */
    public WorkExecutorPoolImpl(
            Channel channel,
            int maxSize) {
        pooledExecutor = new PooledExecutor(channel, maxSize);
        pooledExecutor.setMinimumPoolSize(maxSize);
        pooledExecutor.waitWhenBlocked();
    }

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        EventHandler handler = pipeline.getEventHandler();
        List sourceList = new ArrayList(sources.length);


        for (int i = 0; i < sources.length; i++)
        {
            PooledExecutor threadPool = new PooledExecutor();
            threadPool.setMinimumPoolSize(1);
            threadPool.setMaximumPoolSize(m_maxThreadsPerPool);
            SourceRunner initRunner = new SourceRunner(sources[i], handler);


            try
            {
                threadPool.execute(initRunner);
            }
            catch ( InterruptedException e )
            {
            }

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        {
            throw new IllegalStateException( "ThreadManager is already initailized" );
        }


        final int maxPoolSize = Math.max(( m_processors * m_threadsPerProcessor ) + 1, m_processors + 1);
        m_threadPool = new PooledExecutor( m_processors + 1 );
        m_threadPool.setMinimumPoolSize( 2 ); // at least two threads
        m_threadPool.setMaximumPoolSize( maxPoolSize );
        m_threadPool.waitWhenBlocked();
        m_threadPool.setThreadFactory( new ThreadFactory() {
            public Thread newThread(Runnable run) {

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        if (executor instanceof Service) {
            Service service = (Service) executor;
            service.stop();
        }
        else if (executor instanceof PooledExecutor) {
            PooledExecutor pe = (PooledExecutor) executor;
            pe.shutdownAfterProcessingCurrentlyQueuedTasks();
            //pe.shutdownNow();
            // Wait up to 5 seconds of the threads to shutdown..
            pe.awaitTerminationAfterShutdown(1000*5);
        }
        else if (executor != null) {
            log.warn("Don't know how to cleanly close down the given executor: " + executor
                    + ". Consider deriving from this class to implement the Service interface to shut down cleanly");
        }

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        final int keepAliveTime,


        final boolean waitWhenBlocked) {


        m_threadPool = new PooledExecutor(new BoundedBuffer(threadPoolInitSize), threadPoolMaxSize);


        m_threadPool.setKeepAliveTime(keepAliveTime);


        m_threadPool.createThreads(threadPoolInitSize);

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        final int threadPoolInitSize,


        final int keepAliveTime) {


        m_threadPool = new PooledExecutor(new LinkedQueue());


        m_threadPool.setKeepAliveTime(keepAliveTime);


        m_threadPool.createThreads(threadPoolInitSize);

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        if (backLog <= 0) {
            c = new SynchronousChannel();
        } else {
            c = new BoundedLinkedQueue(backLog);
        }
        this.executor = new PooledExecutor(c, poolSize);
        this.executor.setMinimumPoolSize(poolSize);
        this.executor.setBlockedExecutionHandler(
                new PooledExecutor.BlockedExecutionHandler() {
            public boolean blockedAction(Runnable command) {
                // execute with current thread and log message

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        if (backLog <= 0) {
            c = new SynchronousChannel();
        } else {
            c = new BoundedLinkedQueue(backLog);
        }
        this.executor = new PooledExecutor(c, poolSize);
        this.executor.setMinimumPoolSize(poolSize);
        this.executor.setBlockedExecutionHandler(
                new PooledExecutor.BlockedExecutionHandler() {
            public boolean blockedAction(Runnable command) {
                // execute with current thread and log message

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        this(null, numThreads);
    }


    public ConcurrentTestSuite(String name, int numThreads) {
        super(name);
        executor = new PooledExecutor(numThreads) {
            {
                waitWhenBlocked();
            }
        };
    }

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