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

      final String methodName, byte[] requestBytes, ApiProxy.ApiConfig apiConfig) {
    Semaphore semaphore = (Semaphore) environment.getAttributes().get(
        LocalEnvironment.API_CALL_SEMAPHORE);
    if (semaphore != null) {
      try {
        semaphore.acquire();
      } catch (InterruptedException ex) {
        throw new RuntimeException("Interrupted while waiting on semaphore:", ex);
      }
    }
    boolean offline = environment.getAttributes().get(IS_OFFLINE_REQUEST_KEY) != null;

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        consumedUntil(topic, (numLedgers + 1) * 2L);
        // Wait until ledger ranges is updated.
        Thread.sleep(2000L);


        Semaphore latch = new Semaphore(1);
        latch.acquire();
        tpManager.readTopicPersistenceInfo(topic, new Callback<Versioned<LedgerRanges>>() {
            @Override
            public void operationFinished(Object ctx, Versioned<LedgerRanges> ranges) {
                if (null == ranges || ranges.getValue().getRangesList().size() > 1) {
                    failureException = new PubSubException.NoTopicPersistenceInfoException("Invalid persistence info found for topic " + topic.toStringUtf8());

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            public void operationFailed(Object ctx, PubSubException exception) {
                failureException = exception;
                ((Semaphore)ctx).release();
            }
        }, latch);
        latch.acquire();
        latch.release();
        assertNull("Should not fail with exception.", failureException);
    }


    @Test(timeout=60000)

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        return msgs;
    }


    protected void acquireTopic(ByteString topic) throws Exception {
        Semaphore latch = new Semaphore(1);
        latch.acquire();
        manager.acquiredTopic(topic, new Callback<Void>() {
            @Override
            public void operationFinished(Object ctx, Void resultOfOperation) {
                failureException = null;
                ((Semaphore)ctx).release();

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            public void operationFailed(Object ctx, PubSubException exception) {
                failureException = exception;
                ((Semaphore)ctx).release();
            }
        }, latch);
        latch.acquire();
        latch.release();
        if (null != failureException) {
            throw failureException;
        }
    }

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    protected void releaseTopic(final ByteString topic) throws Exception {
        manager.lostTopic(topic);
        // backward testing ledger ranges without start seq id
        if (removeStartSeqId) {
            Semaphore latch = new Semaphore(1);
            latch.acquire();
            tpManager.readTopicPersistenceInfo(topic, new Callback<Versioned<LedgerRanges>>() {
                @Override
                public void operationFinished(Object ctx, Versioned<LedgerRanges> ranges) {
                    if (null == ranges) {
                        failureException = new PubSubException.NoTopicPersistenceInfoException("No persistence info found for topic " + topic.toStringUtf8());

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                public void operationFailed(Object ctx, PubSubException exception) {
                    failureException = exception;
                    ((Semaphore)ctx).release();
                }
            }, latch);
            latch.acquire();
            latch.release();
            if (null != failureException) {
                throw failureException;
            }
        }

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        final Semaphore finished = new Semaphore(0);
        enqueue(new Runnable() {
            public void run() {
                ready.release();
                try {
                    finished.acquire();
                } catch (InterruptedException ie) {
                    __log.error("Thread interrupted.", ie);
                    throw new BpelEngineException("Thread interrupted.", ie);
                }
            }

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                if (!lock.tryAcquire(timeout, TimeUnit.MILLISECONDS)) {
                    throw new TimeoutException();
                }
            } else {
                thread.setName(original + " (waiting for exchange " + exchange.getId() + ")");
                lock.acquire();
            }
            e.setRole(e.getRole() == Role.Consumer ? Role.Provider : Role.Consumer);
        } catch (InterruptedException ex) {
            exchange.setError(ex);
            for (ExchangeListener l : nmr.getListenerRegistry().getListeners(ExchangeListener.class)) {

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  public <T> T perform(DispatchableAction<T> action) throws IllegalActionException, RemoteException{
    semaphores.putIfAbsent(action.getID(), new Semaphore(0));
    Semaphore semaphore = semaphores.get(action.getID());
    serializer.perform(action);
    try {
      semaphore.acquire();
    } catch (InterruptedException exception) {
      Thread.currentThread().interrupt();
    }
    ActionEvent<T> actionEvent = cast(action);
    return actionEvent.getResult();

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