Examples of java.util.concurrent.Semaphore.acquire()

java.util.concurrent.Semaphore.acquire()
Acquires a permit from this semaphore, blocking until one is available, or the thread is {@linkplain Thread#interrupt interrupted}.
Acquires a permit, if one is available and returns immediately, reducing the number of available permits by one.
If no permit is available then the current thread becomes disabled for thread scheduling purposes and lies dormant until one of two things happens:
- Some other thread invokes the {@link #release} method for thissemaphore and the current thread is next to be assigned a permit; or
- Some other thread {@linkplain Thread#interrupt interrupts}the current thread.
If the current thread:
- has its interrupted status set on entry to this method; or
- is {@linkplain Thread#interrupt interrupted} while waitingfor a permit,
then {@link InterruptedException} is thrown and the current thread'sinterrupted status is cleared. @throws InterruptedException if the current thread is interrupted

            // we acquire it in the thread to avoid blocking other messages with a different call id
            // that could be processed in parallel                                    
            Semaphore semaphore = callIDOrderingStructure.getSemaphore();
            final Queue<SIPMessage> messagesForCallID = callIDOrderingStructure.getMessagesForCallID();
            try {                                                                                
                semaphore.acquire();                                        
            } catch (InterruptedException e) {
                sipStack.getStackLogger().logError("Semaphore acquisition for callId " + callId + " interrupted", e);
            }
            // once acquired we get the first message to process
            SIPMessage message = messagesForCallID.poll();

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      try
      {
         // Create a semaphore and take all its tickets
         Semaphore semaphore = new Semaphore(count);
         semaphore.acquire(count);


         // Create activation threads that will block on the semaphore
         CacheSPI[] caches = new CacheSPI[count];
         for (int i = 0; i < count; i++)
         {

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      StaggeredWebDeployerActivator[] activators = new StaggeredWebDeployerActivator[count];
      try
      {
         // Create a semaphore and take all its tickets
         Semaphore semaphore = new Semaphore(count);
         semaphore.acquire(count);


         // Create activation threads that will block on the semaphore
         CacheSPI[] caches = new CacheSPI[count];
         for (int i = 0; i < count; i++)
         {

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         CacheSPI[] caches = new CacheSPI[count + 1];
         caches[0] = cacheA;


         // Create a semaphore and take all its tickets
         Semaphore semaphore = new Semaphore(count);
         semaphore.acquire(count);


         // Create stressor threads that will block on the semaphore


         for (int i = 0; i < count; i++)
         {

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         public void run()
         {
            try
            {
               sem.acquire(); // we're first to the semaphore


               // log("waiting on barrier");
               barrier.await(); // wait until t2 joins us
               // log("passed barrier");
               lock = s.readLock();

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               log("1st read: value is " + value);
               assertEquals(10, value);
               sem.release(); // give t2 time to make the modification
               TestingUtil.sleepThread(100);


               sem.acquire(); // to read the uncommitted modification by t2
               log("2nd read: value is " + value + "; we should see t2's uncommitted change (20)");
               assertEquals(20, value); // we're seeing the modification by t2 before t2 committed (a.k.a. released the lock)
               sem.release();
               TestingUtil.sleepThread(100);

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               log("2nd read: value is " + value + "; we should see t2's uncommitted change (20)");
               assertEquals(20, value); // we're seeing the modification by t2 before t2 committed (a.k.a. released the lock)
               sem.release();
               TestingUtil.sleepThread(100);


               sem.acquire(); // to read the committed change by t2
               log("3rd read: value is still " + value + "; we should see t2's committed change");
               assertEquals(20, value);
            }
            catch (Throwable ex)
            {

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         {
            try
            {
               TestingUtil.sleepThread(100);
               barrier.await();
               sem.acquire();
               lock = s.writeLock();
               lock.tryLock(TIMEOUT, TimeUnit.MILLISECONDS);
               log("changing value from " + value + " to 20");
               value = 20;
               sem.release(); // now t1 can read the uncommitted modification

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               log("changing value from " + value + " to 20");
               value = 20;
               sem.release(); // now t1 can read the uncommitted modification
               TestingUtil.sleepThread(100);


               sem.acquire(); // to unlock the lock
               log("committing the TX");
               lock.unlock();
            }
            catch (Throwable ex)
            {

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            final Queue<SIPMessage> messagesForCallID = callIDOrderingStructure.getMessagesForCallID();
            if(sipStack.sipEventInterceptor != null) {
              sipStack.sipEventInterceptor.beforeMessage(messagesForCallID.peek());
            }
            try {                                                                                
                semaphore.acquire();                                        
            } catch (InterruptedException e) {
                sipStack.getStackLogger().logError("Semaphore acquisition for callId " + callId + " interrupted", e);
            }
            // once acquired we get the first message to process
            SIPMessage message = messagesForCallID.poll();

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