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

      }
    };
    final String type = "test";
    engine.addMessageListener(type, listener);
    engine.send(new TestMessage<String>(type, expectedBody));
    lock.tryAcquire(3, TimeUnit.SECONDS);
    assertEquals(expectedBody, actualBody.toString());
    engine.stop();
  }


  @Test(timeout = 1000)

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    engine.addMessageListener(type, listener);
    final int totalMessages = 1000;
    for (int i = 0; i < totalMessages; i++) {
      engine.send(message);
    }
    lock.tryAcquire(totalMessages, 3, TimeUnit.SECONDS);
    assertEquals(totalMessages, counter.get());
    engine.stop();
  }


  @Test(timeout = 1000)

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    engine.addMessageListener(type, listenerB);
    final int totalMessages = 1000;
    for (int i = 0; i < totalMessages; i++) {
      engine.send(message);
    }
    lock.tryAcquire(totalMessages * 2, 3, TimeUnit.SECONDS);
    assertEquals(totalMessages * 2, counter.get());
    engine.stop();
  }


  @Test

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            for (int i = 0; i < configs.length; i++) {
                configs[i].delete();
            }


            if (!sem.tryAcquire(1, TimeUnit.SECONDS)) {
                throw new IOException("Not all instances were removed in time.");
            }
            tracker.close();
        }
    }

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            for (int i = 0; i < configs.length; i++) {
                configs[i].delete();
            }


            if (!sem.tryAcquire(1, TimeUnit.SECONDS)) {
                throw new IOException("Not all instances were removed in time.");
            }
            tracker.close();
        }
    }

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            };
            tracker.open();


            configs[0].delete();


            if (!sem.tryAcquire(1, TimeUnit.SECONDS)) {
                throw new IOException("Instance did not get removed in time.");
            }
        }
    }

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            // there is no limit, always allow it
            permit.name = null;
            return permit;
        }


        boolean permitted = semaphore.tryAcquire();


        if (!permitted) {
            int deniedCount = getDeniedCount(name).incrementAndGet(); // don't worry about this not being atomic with aquire, no biggie
            long sleepBeforeRetry = getSleepBeforeRetryHint(deniedCount);
            throw new NotPermittedException(sleepBeforeRetry);

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                sem.release();
            }
        }.start();


        // wait for the reading to be done
        sem.tryAcquire(5, TimeUnit.SECONDS);


        request = m_cachedRepository.getRequest(true);
        assert request[0].equals("checkout");


        // inspect the current contents of impl

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      semaphore.release(numThreads);
      
      try
      {
         assertTrue("messages received within 15 seconds", semaphore.tryAcquire(numThreads, 15, TimeUnit.SECONDS));
         
         log.info("Messages received");
      }
      finally
      {

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      }
      {
        // wait until jetty handler receives reply and captures session
        for ( int i = 1; i <= 12; i++ ) {
          log.debug( "Waiting for 5 sec (" + i + ")" );
          if ( semaphore.tryAcquire( 5, TimeUnit.SECONDS ) ) {
            Thread.sleep( 1000 );
            break;
          }
        }
      }

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