List of tryAcquire() Examples

Examples of tryAcquire()

com.hazelcast.core.ISemaphore.tryAcquire()
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}. @return {@code true} if a permit was acquired and {@code false}otherwise
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
org.apache.hadoop.hbase.InterProcessLock.tryAcquire()
Acquire the lock within a wait time. @param timeoutMs The maximum time (in milliseconds) to wait for the lock,-1 to wait indefinitely @return True if the lock was acquired, false if waiting time elapsedbefore the lock was acquired @throws IOException If there is an unrecoverable error talking talking(e.g., when talking to a lock service) when acquiring the lock @throws InterruptedException If the thread is interrupted while waiting toacquire the lock
org.chromium.sdk.CallbackSemaphore.tryAcquire()
Tries to acquire the semaphore. This method blocks until the semaphore is released; typically release call comes from a worker thread of org.chromium.sdk, the same thread that may call all other callbacks. It is vital not to call this method from any callback of org.chromium.sdk, because it's a sure deadlock. To prevent, this the method declares throwing {@code MethodIsBlockingException} which is symbolically thrown wheneversomeone violates this rule (i.e. invokes this method from a callback). Though currently nobody actually throws it, such declarations help to track blocking methods. @return false if {@code timeout} was exceeded and we gave up @throws MethodIsBlockingException if called from a callback
org.menagerie.latches.spi.ZkSemaphore.tryAcquire()
Acquires a permit from this semaphore only if it is available at the time of invocation.
If a permit is immediately available, this method returns {@code true} immediately, reducing the number ofavailable permits in the semaphore by one.
If no permit is available then this method will return immediately with the value {@code false}.
Note: Unlike {@link java.util.concurrent.Semaphore#tryAcquire()}, this method will obey ordering policies, and will never acquire a permit at the expense of another party. @return true if a permit has been acquired, false otherwise

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

117 118 119 120 121 122 123 124 125 126 127          // 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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Examples of java.util.concurrent.Semaphore.tryAcquire()

227 228 229 230 231 232 233 234 235 236 237          // 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);             }          }

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

408 409 410 411 412 413 414 415 416 417 418                System.out.println("Activating /" + stressor.getName() + " on A");                cacheA.getRegion(Fqn.fromString("/" + stressor.getName()), true).activate();                stressor.stopPuts();                System.out.println("Run " + x + "-- /" + stressor.getName() + " activated on A");                // Reacquire one semaphore ticket                boolean acquired = semaphore.tryAcquire(60, TimeUnit.SECONDS);                if (!acquired)                {                   fail("failed to acquire semaphore " + stressor.getName());                }

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

194 195 196 197 198 199 200 201 202 203 204         ConnectFuture connectFuture = vmPipeConnector.connect(vmPipeAddress);         connectFuture.awaitUninterruptibly();         connectFuture.getSession().write(IoBuffer.wrap(new byte[1]));         connectFuture.getSession().close(false).awaitUninterruptibly();         semaphore.tryAcquire(1, TimeUnit.SECONDS);         vmPipeAcceptor.unbind(vmPipeAddress);         Assert.assertEquals(1, connectFuture.getSession().getWrittenBytes());         Assert.assertEquals("ABCD", stringBuffer.toString());     } }

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

56 57 58 59 60 61 62 63       }     };         bqp.quiesce(qc, Arrays.asList(testBundle));         assertTrue(result.tryAcquire(2, TimeUnit.SECONDS)); } }

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

373 374 375 376 377 378 379 380 381 382 383             server.stop();             // test foreground retry             client.checkExists().forPath("/hey");             Assert.assertTrue(semaphore.tryAcquire(MAX_RETRIES, timing.forWaiting().seconds(), TimeUnit.SECONDS));             semaphore.drainPermits();             retries.set(0);             server.stop();

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

382 383 384 385 386 387 388 389 390 391 392             server.stop();             // test background retry             client.checkExists().inBackground().forPath("/hey");             Assert.assertTrue(semaphore.tryAcquire(MAX_RETRIES, timing.forWaiting().seconds(), TimeUnit.SECONDS));         }         catch ( Throwable e )         {             Assert.fail("Error", e);         }

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

213 214 215 216 217 218 219 220 221 222 223             return true;         } else {             for(int i = 0; i < numNodes; i++) {                 try {                     long timeoutMs = timeoutConfig.getOperationTimeout(VoldemortOpCode.DELETE_OP_CODE);                     boolean acquired = semaphore.tryAcquire(timeoutMs, TimeUnit.MILLISECONDS);                     if(!acquired)                         logger.warn("Delete operation timed out waiting for operation " + i                                     + " to complete after waiting " + timeoutMs + " ms.");                     // okay, at least the required number of operations have                     // completed, were they successful?

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

656 657 658 659 660 661 662 663 664 665 666                 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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Examples of java.util.concurrent.Semaphore.tryAcquire()

399 400 401 402 403 404 405 406 407 408 409                                 stackLogger.logDebug("trying to acquiring semaphore for message " + message);                             }                             // we try to acquire here so that if the result if false because it is already acquired                             // we acquire it in the thread to avoid blocking other messages with a different call id                             // that could be processed in parallel                             final boolean acquired = callIdSemaphore.tryAcquire(0, TimeUnit.SECONDS);                                                                                                               Thread messageDispatchTask = new Thread() {                                 @Override                                 public void run() {                                     // if it was not acquired above

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