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

        
        rsaList.add(rsa);
        
        tm.triggerExportImportForRemoteSericeAdmin(rsa);
        
        assertTrue(sema.tryAcquire(10, TimeUnit.SECONDS));
        
        
        tm.stop();
        
        c.verify();

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                semaphore.release();
            }
        }.start();
        m_repository.writeLocal(in);
        try {
            if (!semaphore.tryAcquire(30, TimeUnit.SECONDS)) {
                throw new IOException("Error writing the contents of RepositoryUserAdmin.");
            }
        }
        catch (InterruptedException e) {
            Thread.currentThread().interrupt();

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                     }


                     message.getBodyBuffer().writeBytes(new byte[50]);


                     producer.send(message);
                     assertTrue(semop.tryAcquire(1, 10, TimeUnit.SECONDS));
                  }
               }
               catch (Throwable e)
               {
                  e.printStackTrace(System.out);

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          try { 
            s.acquire();
          } catch (InterruptedException ix) {}
        } else { 
          try { 
            s.tryAcquire(graceperiod, TimeUnit.MILLISECONDS);
          } catch (InterruptedException ix) {}
        }
      }
      result = bpcRef.get();
      st.close();

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        creationSemaphore = new Semaphore(1, true);
        socketCreationMap.put(key, creationSemaphore);
      }
    }
    try {
      boolean retval = creationSemaphore.tryAcquire(10, TimeUnit.SECONDS);
      if (!retval) {
        throw new IOException("Could not acquire IO Semaphore'" + key
            + "' after 10 seconds -- giving up ");
      }
    } catch (InterruptedException e) {

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                semaphore.drainPermits();
                _semaphores.putIfAbsent(thread, semaphore);
            }
            semaphore = _semaphores.get(thread);
            try {
                semaphore.tryAcquire(timeout, TimeUnit.MILLISECONDS);
            } catch (InterruptedException exception) {
                logger.log(Level.FINER, "Exception ", exception);
            }
        }

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                int next = random.nextInt(100);
                countList.add(next);
                count.setCount(next);


                Assert.assertTrue(semaphore.tryAcquire(CLIENT_QTY, 10, TimeUnit.SECONDS));
            }
            count.setCount(-1);


            for ( Future<List<Integer>> future : futures )
            {

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                creationSemaphore = new Semaphore(1, true);
                socketCreationMap.put(key, creationSemaphore);
            }
        }
        try {
            boolean retval = creationSemaphore.tryAcquire(10, TimeUnit.SECONDS);
            if (!retval) {
                throw new IOException("Could not acquire IO Semaphore'" + key
                        + "' after 10 seconds -- giving up ");
            }
        } catch (InterruptedException e) {

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            }
        }
        s.release(notOwnedCount);
        try {
            if (ok.get()) {
                return s.tryAcquire(partitionCount, 10, TimeUnit.SECONDS) && ok.get();
            } else {
                return false;
            }
        } catch (InterruptedException ignored) {
            return false;

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         // Reacquire the semaphore tickets; when we have them all
         // we know the threads are done
         for (int i = 0; i < count; i++)
         {
            boolean acquired = semaphore.tryAcquire(60, TimeUnit.SECONDS);
            if (!acquired) fail("failed to acquire semaphore " + i);
         }


         // allow any async calls to clear
         if (!sync)

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