Examples of edu.emory.mathcs.backport.java.util.concurrent.SynchronousQueue

Package edu.emory.mathcs.backport.java.util.concurrent

Examples of edu.emory.mathcs.backport.java.util.concurrent.SynchronousQueue

edu.emory.mathcs.backport.java.util.concurrent.SynchronousQueue
A {@linkplain BlockingQueue blocking queue} in which each insertoperation must wait for a corresponding remove operation by another thread, and vice versa. A synchronous queue does not have any internal capacity, not even a capacity of one. You cannot peek at a synchronous queue because an element is only present when you try to remove it; you cannot insert an element (using any method) unless another thread is trying to remove it; you cannot iterate as there is nothing to iterate. The head of the queue is the element that the first queued inserting thread is trying to add to the queue; if there is no such queued thread then no element is available for removal and poll() will return null. For purposes of other Collection methods (for example contains), a SynchronousQueue acts as an empty collection. This queue does not permit null elements.
Synchronous queues are similar to rendezvous channels used in CSP and Ada. They are well suited for handoff designs, in which an object running in one thread must sync up with an object running in another thread in order to hand it some information, event, or task.
This class supports an optional fairness policy for ordering waiting producer and consumer threads. By default, this ordering is not guaranteed. However, a queue constructed with fairness set to true grants threads access in FIFO order. Fairness generally decreases throughput but reduces variability and avoids starvation.
This class and its iterator implement all of the optional methods of the {@link Collection} and {@link Iterator} interfaces.
This class is a member of the Java Collections Framework. @since 1.5 @author Doug Lea

    public ThreadPool(int poolSize, String poolName, long keepAliveTime, ClassLoader classLoader, String objectName) {
        ThreadPoolExecutor p = new ThreadPoolExecutor(
            poolSize, // core size
            poolSize, // max size
            keepAliveTime, TimeUnit.MILLISECONDS,
            new SynchronousQueue());


        p.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());
        p.setThreadFactory(new ThreadPoolThreadFactory(poolName, classLoader));
        
        try {

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  protected BlockingQueue createQueue(int queueCapacity) {
    if (queueCapacity > 0) {
      return new LinkedBlockingQueue(queueCapacity);
    }
    else {
      return new SynchronousQueue();
    }
  }

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 * @version $Rev$, $Date$
 */
public class ExecutorThreadModelFactoryBeanTest extends TestCase {
    public void testSuccessfulCreationWithExecutor() throws Exception {
        Executor executor = new ThreadPoolExecutor(1, 10, 3600,
                TimeUnit.SECONDS, new SynchronousQueue());
        ExecutorThreadModelFactoryBean factory = new ExecutorThreadModelFactoryBean();
        factory.setServiceName("foo");
        factory.setExecutor(executor);
        factory.afterPropertiesSet();
        ExecutorThreadModel threadModel = (ExecutorThreadModel) factory

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     * Constructs a <code>DefaultThreadPoolExecutor</code> with configuration that
     * matches the return from {@link java.util.concurrent.Executors#newCachedThreadPool()}.
     */
    public DefaultThreadPoolExecutor()
    {
        super(0, Integer.MAX_VALUE, 60L, TimeUnit.SECONDS, new SynchronousQueue());
    }

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    protected ThreadPoolExecutor createDefaultExecutor(final String name,
                                                       final int priority,
                                                       final boolean daemon) {
        ThreadPoolExecutor rc = new ThreadPoolExecutor(corePoolSize , maxPoolSize , 10,
                TimeUnit.SECONDS, new SynchronousQueue(),
                new edu.emory.mathcs.backport.java.util.concurrent.ThreadFactory() {
            public Thread newThread(Runnable runnable) {
                Thread thread = new Thread(runnable, name);
                thread.setDaemon(daemon);
                thread.setPriority(priority);

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        if (config.getQueueSize() != 0 && config.getCorePoolSize() == 0) {
            throw new IllegalArgumentException("CorePoolSize must be > 0 when using a capacity queue");
        }
        BlockingQueue queue;
        if (config.getQueueSize() == 0) {
            queue = new SynchronousQueue();
        } else if (config.getQueueSize() < 0 || config.getQueueSize() == Integer.MAX_VALUE) {
            queue = new LinkedBlockingQueue();
        } else {
            queue = new ArrayBlockingQueue(config.getQueueSize());
        }

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    public ThreadPool(int poolSize, String poolName, long keepAliveTime, ClassLoader classLoader, String objectName) {
        ThreadPoolExecutor p = new ThreadPoolExecutor(
            poolSize, // core size
            poolSize, // max size
            keepAliveTime, TimeUnit.MILLISECONDS,
            new SynchronousQueue());


        p.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());
        p.setThreadFactory(new ThreadPoolThreadFactory(poolName, classLoader));
        
        try {

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  protected BlockingQueue createQueue(int queueCapacity) {
    if (queueCapacity > 0) {
      return new LinkedBlockingQueue(queueCapacity);
    }
    else {
      return new SynchronousQueue();
    }
  }

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     * Constructs a <code>DefaultThreadPoolExecutor</code> with configuration that
     * matches the return from {@link java.util.concurrent.Executors#newCachedThreadPool()}.
     */
    public DefaultThreadPoolExecutor()
    {
        super(0, Integer.MAX_VALUE, 60L, TimeUnit.SECONDS, new SynchronousQueue());
    }

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    protected ThreadPoolExecutor createDefaultExecutor(final String name,
                                                       final int priority,
                                                       final boolean daemon) {
        ThreadPoolExecutor rc = new ThreadPoolExecutor(5, Integer.MAX_VALUE, 10,
                TimeUnit.SECONDS, new SynchronousQueue(),
                new edu.emory.mathcs.backport.java.util.concurrent.ThreadFactory() {
            public Thread newThread(Runnable runnable) {
                Thread thread = new Thread(runnable, name);
                thread.setDaemon(daemon);
                thread.setPriority(priority);

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