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. ]

            Socket socket = null;
            try {
                socket = serverSocket.accept();
                if (socket != null) {
                    // have thread per channel for sending messages and a thread for receiving them
                    PooledExecutor executor = null;
                    if (useAsyncSend) {
                        executor = new PooledExecutor(new BoundedBuffer(maxOutstandingMessages), 1);
                    }
                    TcpTransportChannel channel = new TcpTransportChannel(wireFormat, socket, executor);
                    addClient(channel);
                }
            }

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        started = new SynchronizedBoolean(false);
        // there's not much point logging all exceptions, lets just keep a few around
        exceptionsList = new BoundedLinkedQueue(10);
        outboundLock = new Object();
        if (useAsyncSend) {
            executor = new PooledExecutor(new BoundedBuffer(1000), 1);
        }
    }

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    public void testAsyncProxy() throws Exception {
        MockServer service = new MockServerImpl();
        
        // thread pool to execute tasks in
        PooledExecutor executor = new PooledExecutor(1);
        
        // async proxy
        MockServer proxy = (MockServer) AsyncProxy.createProxy(MockServer.class, service, executor);


        // lets make an async call

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    protected void createBoundedThreadPool(final int threadPoolMaxSize,
                                           final int threadPoolMinSize,
                                           final int threadPoolInitSize,
                                           final int keepAliveTime,
                                           final boolean waitWhenBlocked) {
        m_threadPool = new PooledExecutor(new BoundedBuffer(threadPoolInitSize), threadPoolMaxSize);
        m_threadPool.setKeepAliveTime(keepAliveTime);
        m_threadPool.createThreads(threadPoolInitSize);
        m_threadPool.setMinimumPoolSize(threadPoolMinSize);
        if (waitWhenBlocked) {
            m_threadPool.waitWhenBlocked();

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     * @param keepAliveTime
     */
    protected void createDynamicThreadPool(final int threadPoolMinSize,
                                           final int threadPoolInitSize,
                                           final int keepAliveTime) {
        m_threadPool = new PooledExecutor(new LinkedQueue());
        m_threadPool.setKeepAliveTime(keepAliveTime);
        m_threadPool.createThreads(threadPoolInitSize);
        m_threadPool.setMinimumPoolSize(threadPoolMinSize);
    }

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        final boolean useQueueing = poolConfig.getChild("use-queueing").getValueAsBoolean(false);
        final int queueSize = poolConfig.getChild("queue-size").getValueAsInteger(-1);


        if (useQueueing) {
            if (queueSize > 0) {
                m_executor = new PooledExecutor(new BoundedBuffer(queueSize));
            } else {
                m_executor = new PooledExecutor(new LinkedQueue());
            }
        } else {
            m_executor = new PooledExecutor();
        }


        final int maxPoolSize = poolConfig.getChild("max-pool-size").getValueAsInteger(-1);


        if (maxPoolSize > 0) {

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    private void createBoundedThreadPool(final int threadPoolMaxSize,
                                         final int threadPoolMinSize,
                                         final int threadPoolInitSize,
                                         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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     * @param keepAliveTime
     */
    private void createDynamicThreadPool(final int threadPoolMinSize,
                                         final int threadPoolInitSize,
                                         final int keepAliveTime) {
        m_threadPool = new PooledExecutor(new LinkedQueue());
        m_threadPool.setKeepAliveTime(keepAliveTime);
        m_threadPool.createThreads(threadPoolInitSize);
        m_threadPool.setMinimumPoolSize(threadPoolMinSize);
    }

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            final int threadPoolMaxSize,
            final int threadPoolMinSize,
            final int threadPoolInitSize,
            final int keepAliveTime,
            final boolean waitWhenBlocked) {
        m_threadPool = new PooledExecutor(new BoundedBuffer(threadPoolInitSize), threadPoolMaxSize);
        m_threadPool.setKeepAliveTime(keepAliveTime);
        m_threadPool.createThreads(threadPoolInitSize);
        m_threadPool.setMinimumPoolSize(threadPoolMinSize);
        if (waitWhenBlocked) m_threadPool.waitWhenBlocked();
    }

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     */
    protected void createDynamicThreadPool(
            final int threadPoolMinSize,
            final int threadPoolInitSize,
            final int keepAliveTime) {
        m_threadPool = new PooledExecutor(new LinkedQueue());
        m_threadPool.setKeepAliveTime(keepAliveTime);
        m_threadPool.createThreads(threadPoolInitSize);
        m_threadPool.setMinimumPoolSize(threadPoolMinSize);
    }

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