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()

358 359 360 361 362 363 364 365 366 367 368                 Thread.sleep(1000);             }         }         // Wait until all updates return         if(!sem.tryAcquire(ClientBase.CONNECTION_TIMEOUT, TimeUnit.MILLISECONDS)) {             LOG.warn("Did not aquire semaphore fast enough");         }         mytestfooThread.join(ClientBase.CONNECTION_TIMEOUT);         if (mytestfooThread.isAlive()) {             LOG.error("mytestfooThread is still alive");

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

32 33 34 35 36 37 38 39 40 41 42       }     };     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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Examples of java.util.concurrent.Semaphore.tryAcquire()

58 59 60 61 62 63 64 65 66 67 68     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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Examples of java.util.concurrent.Semaphore.tryAcquire()

92 93 94 95 96 97 98 99 100 101 102     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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Examples of java.util.concurrent.Semaphore.tryAcquire()

408 409 410 411 412 413 414 415 416 417 418             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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Examples of java.util.concurrent.Semaphore.tryAcquire()

245 246 247 248 249 250 251 252 253 254 255             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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Examples of java.util.concurrent.Semaphore.tryAcquire()

273 274 275 276 277 278 279 280 281 282 283             };             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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Examples of java.util.concurrent.Semaphore.tryAcquire()

95 96 97 98 99 100 101 102 103 104 105             // 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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Examples of java.util.concurrent.Semaphore.tryAcquire()

126 127 128 129 130 131 132 133 134 135 136                 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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Examples of java.util.concurrent.Semaphore.tryAcquire()

266 267 268 269 270 271 272 273 274 275 276             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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