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

java.util.concurrent.Semaphore.tryAcquire()
Acquires a permit from this semaphore, only if one is available at the time of invocation.
Acquires a permit, if one is available and returns immediately, with the value {@code true}, reducing the number of available permits by one.
If no permit is available then this method will return immediately with the value {@code false}.
Even when this semaphore has been set to use a fair ordering policy, a call to {@code tryAcquire()} willimmediately acquire a permit if one is available, whether or not other threads are currently waiting. This "barging" behavior can be useful in certain circumstances, even though it breaks fairness. If you want to honor the fairness setting, then use {@link #tryAcquire(long,TimeUnit) tryAcquire(0, TimeUnit.SECONDS) }which is almost equivalent (it also detects interruption). @return {@code true} if a permit was acquired and {@code false}otherwise

            blockUntilViewsReceived(channels, 60000);
            


            // Re-acquire the semaphore tickets; when we have them all
            // we know the threads are done
            boolean acquired = semaphore.tryAcquire(count, 20, TimeUnit.SECONDS);
            if(!acquired){
                log.warn("Most likely a bug, analyse the stack below:");
                log.warn(Util.dumpThreads());
            }                 
            Util.sleep(1000);

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            // Sleep to ensure the threads get all the semaphore tickets
            Util.sleep(1000);


            // Reacquire the semaphore tickets; when we have them all
            // we know the threads are done
            boolean acquired = semaphore.tryAcquire(count, 30, TimeUnit.SECONDS);
            if(!acquired){
                log.warn("Most likely a bug, analyse the stack below:");
                log.warn(Util.dumpThreads());
            }

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  {
    Semaphore sem = semaphore;
    
    if (sem != null)
    {
      return sem.tryAcquire(timeout, TimeUnit.MILLISECONDS);
    }
    else
    {
      return true;
    }

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        Util.sleep(1000);


        // Reacquire the semaphore tickets; when we have them all
        // we know the threads are done
        boolean acquired = semaphore.tryAcquire( apps.length, 30, TimeUnit.SECONDS);
        if(!acquired){
            log.warn("Most likely a bug, analyse the stack below:");
            log.warn(Util.dumpThreads());
        }

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            blockUntilViewsReceived(channels, 60000);


            // Reacquire the semaphore tickets; when we have them all
            // we know the threads are done
            boolean acquired = semaphore.tryAcquire(channelCount, 60, TimeUnit.SECONDS);
            if(!acquired){
                log.warn("Most likely a bug, analyse the stack below:");
                log.warn(Util.dumpThreads());
            }

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            // Sleep to ensure the threads get all the semaphore tickets
            Util.sleep(1000);


            // Reacquire the semaphore tickets; when we have them all
            // we know the threads are done
            boolean acquired = semaphore.tryAcquire(count, 20, TimeUnit.SECONDS);
            if(!acquired){
                log.warn("Most likely a bug, analyse the stack below:");
                log.warn(Util.dumpThreads());
            }

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        // Sleep to ensure the threads get all the semaphore tickets
        Util.sleep(1000);


        // Reacquire the semaphore tickets; when we have them all
        // we know the threads are done
        s.tryAcquire(1, 60, TimeUnit.SECONDS);
        receivers[0].cleanup();
        Util.sleep(1000);


        checkEventStateTransferSequence(receivers[0]);

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            // Sleep to ensure the threads get all the semaphore tickets
            Util.sleep(1000);


            // Reacquire the semaphore tickets; when we have them all
            // we know the threads are done
            semaphore.tryAcquire(count, 60, TimeUnit.SECONDS);


            // do general asserts about channels
            a.verify(channels);


            // kill random member

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                }, null);
            }
        }


        // Wait until all updates return
        if(!sem.tryAcquire(ClientBase.CONNECTION_TIMEOUT, TimeUnit.MILLISECONDS)) {
            LOG.warn("Did not aquire semaphore fast enough");
        }
        mytestfooThread.join(ClientBase.CONNECTION_TIMEOUT);
        if (mytestfooThread.isAlive()) {
            LOG.error("mytestfooThread is still alive");

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                Thread.sleep(1000);
            }
        }


        // Wait until all updates return
        if(!sem.tryAcquire(ClientBase.CONNECTION_TIMEOUT, TimeUnit.MILLISECONDS)) {
            LOG.warn("Did not aquire semaphore fast enough");
        }
        mytestfooThread.join(ClientBase.CONNECTION_TIMEOUT);
        if (mytestfooThread.isAlive()) {
            LOG.error("mytestfooThread is still alive");

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