Examples of java.util.concurrent.SynchronousQueue

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 {@code peek} at a synchronous queue because an element is onlypresent 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 {@code poll()} will return {@code null}. For purposes of other {@code Collection} methods (for example {@code contains}), a {@code SynchronousQueue} acts as an empty collection. This queuedoes not permit {@code 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 {@code true} grants threads access in FIFO order.
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 and Bill Scherer and Michael Scott @param < E> the type of elements held in this collection

        {
            buffer = new LinkedBlockingDeque(tp.getMaxBufferSize());
        }
        else
        {
            buffer = new SynchronousQueue();
        }


        ThreadPoolExecutor pool = internalCreatePool(name, tp, buffer);
        configureThreadPoolExecutor(name, tp, pool);
        return pool;

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        boolean preStartAllCoreThreads = val != null ? Boolean.parseBoolean(val.trim())
                : EjbContainer.DEFAULT_PRESTART_ALL_CORE_THREADS;


        BlockingQueue workQueue = queueCapacity > 0
                ? new LinkedBlockingQueue<Runnable>(queueCapacity)
                : new SynchronousQueue(true);


        result = new EjbThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveSeconds, workQueue, poolName);


        if(allowCoreThreadTimeout) {
            result.allowCoreThreadTimeOut(true);

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        boolean preStartAllCoreThreads = val != null ? Boolean.parseBoolean(val.trim())
                : EjbContainer.DEFAULT_PRESTART_ALL_CORE_THREADS;


        BlockingQueue workQueue = queueCapacity > 0
                ? new LinkedBlockingQueue<Runnable>(queueCapacity)
                : new SynchronousQueue(true);


        result = new EjbThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveSeconds, workQueue, poolName);


        if(allowCoreThreadTimeout) {
            result.allowCoreThreadTimeOut(true);

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    @Test
    public void testReadPerformance() throws Throwable {
        int size = 10;
        ExecutorService es = new ThreadPoolExecutor(size, Integer.MAX_VALUE,
                              30, TimeUnit.SECONDS, new SynchronousQueue());
        ((ThreadPoolExecutor)es).prestartAllCoreThreads();


        for (int i=0; i<size; i++)
          es.execute(new WriteSpaceTask("PerformTask-"+i));
        ISOUtil.sleep(500);

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    @Test
    public void testDeadLockWithNotify() throws Throwable {
        int size = 10;
        final ExecutorService es = new ThreadPoolExecutor(size*2, Integer.MAX_VALUE,
                              30, TimeUnit.SECONDS, new SynchronousQueue());
        ((ThreadPoolExecutor)es).prestartAllCoreThreads();
        
        for (int i=0; i<size; i++)
          es.execute(new WriteSpaceWithNotifyTask("WriteTask1-"+i,sp1,sp2));
        for (int i=0; i<size; i++)

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    @Ignore("Remove it when TSpace can pass it")
    @Test
    public void testStolenEntryAtNotify() throws Throwable {
        int size = 10;
        final ExecutorService es = new ThreadPoolExecutor(size*2, Integer.MAX_VALUE,
                              30, TimeUnit.SECONDS, new SynchronousQueue());
        ((ThreadPoolExecutor)es).prestartAllCoreThreads();
        
        for (int i=0; i<size; i++)
          es.execute(new WriteSpaceWithNotifyReadTask("WriteTask-"+i));

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


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

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


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

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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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        boolean preStartAllCoreThreads = val != null ? Boolean.parseBoolean(val.trim())
                : EjbContainer.DEFAULT_PRESTART_ALL_CORE_THREADS;


        BlockingQueue workQueue = queueCapacity > 0
                ? new LinkedBlockingQueue<Runnable>(queueCapacity)
                : new SynchronousQueue(true);


        result = new EjbThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveSeconds, workQueue, poolName);


        if(allowCoreThreadTimeout) {
            result.allowCoreThreadTimeOut(true);

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