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 com.hazelcast.core.ISemaphore.tryAcquire()

291 292 293 294 295 296 297 298 299 300 301         int numberOfPermits = 20;         assertTrue(semaphore.init(numberOfPermits));         for (int i = 0; i < numberOfPermits; i++) {             assertEquals(numberOfPermits - i, semaphore.availablePermits());             assertEquals(semaphore.tryAcquire(), true);         }         assertFalse(semaphore.tryAcquire());         assertEquals(semaphore.availablePermits(), 0);     }

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

55 56 57 58 59 60 61 62 63 64 65             Util.blockUntilViewsReceived(30000, 500, tmp);             System.out.println(">>>> all nodes have the same view <<<<");             // 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());             }

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

40 41 42 43 44 45 46 47 48 49 50             tmp[i] = receivers[i].getChannel();         Util.blockUntilViewsReceived(60000, 1000, tmp);         // 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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Examples of java.util.concurrent.Semaphore.tryAcquire()

347 348 349 350 351 352 353 354 355 356 357                 tmp[cnt++] = receiver.getChannel();             Util.blockUntilViewsReceived(30000, 1000, tmp);             // Reacquire the semaphore tickets; when we have them all             // we know the threads are done             semaphore.tryAcquire(count, 40, TimeUnit.SECONDS);             Util.sleep(1000); //let all events propagate...             for (FlushTestReceiver app : channels)                 app.getChannel().setReceiver(null);             for (FlushTestReceiver app : channels)

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

70 71 72 73 74 75 76 77 78 79 80             Util.blockUntilViewsReceived(60000, 1000, tmp);             // 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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Examples of java.util.concurrent.Semaphore.tryAcquire()

325 326 327 328 329 330 331 332 333 334 335             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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Examples of java.util.concurrent.Semaphore.tryAcquire()

152 153 154 155 156 157 158 159 160 161 162     public Response load(final Request request, final CacheStrategy cacheStrategy, final long maxFileSize, final boolean checkBlacklist) throws IOException {         final String url = request.url().toNormalform(true, false);         Semaphore check = this.loaderSteering.get(url);         if (check != null) {             // a loading process may be going on for that url             try { check.tryAcquire(5, TimeUnit.SECONDS);} catch (final InterruptedException e) {}             // now the process may have terminated and we run a normal loading             // which may be successful faster because of a cache hit         }         this.loaderSteering.put(url, new Semaphore(0));

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

108 109 110 111 112 113 114 115 116 117 118     Semaphore semaphore = _concurrentSemaphore;         if (semaphore != null) {       try {         Thread.interrupted();         if (! semaphore.tryAcquire(_concurrentTimeout, TimeUnit.MILLISECONDS))           throw new RuntimeException(L.l("{0} concurrent max exceeded", this));       } catch (Exception e) {         throw new RuntimeException(e);       }     }

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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, 10, 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, 10, TimeUnit.SECONDS));         }         catch ( Throwable e )         {             Assert.fail("Error", e);         }

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