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()

156 157 158 159 160 161 162 163 164 165 166 public static void waitForEvent(int occurrences, String event, long timeout) {     log.debug("waiting for " + event);     Semaphore eventSemaphore = getEventSemaphore(event);     try {       if (eventSemaphore.tryAcquire(occurrences, timeout, TimeUnit.MILLISECONDS)) {         log.debug("received '" + event + "' notification");       }       else {         throw new JbpmException("event '" + event + "' did not occur within " + timeout + " ms");       }

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

110 111 112 113 114 115 116 117 118 119 120             blockUntilViewsReceived(channels, 60000);                         // 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());             }                             Util.sleep(1000);

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

99 100 101 102 103 104 105 106 107 108 109             // Sleep to ensure the threads get all the semaphore tickets             Util.sleep(1000);             // Reacquire the semaphore tickets; when we have them all             // we know the threads are done             boolean acquired = semaphore.tryAcquire(count, 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()

47 48 49 50 51 52 53 54 55 56 57 {     Semaphore sem = semaphore;         if (sem != null)     {       return sem.tryAcquire(timeout, TimeUnit.MILLISECONDS);     }     else     {       return true;     }

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

81 82 83 84 85 86 87 88 89 90 91         Util.sleep(1000);         // 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()

93 94 95 96 97 98 99 100 101 102 103             blockUntilViewsReceived(channels, 60000);             // Reacquire the semaphore tickets; when we have them all             // we know the threads are done             boolean acquired = semaphore.tryAcquire(channelCount, 60, 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()

124 125 126 127 128 129 130 131 132 133 134             // Sleep to ensure the threads get all the semaphore tickets             Util.sleep(1000);             // Reacquire 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()

81 82 83 84 85 86 87 88 89 90 91         // Sleep to ensure the threads get all the semaphore tickets         Util.sleep(1000);         // 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()

305 306 307 308 309 310 311 312 313 314 315             // Sleep to ensure the threads get all the semaphore tickets             Util.sleep(1000);             // Reacquire the semaphore tickets; when we have them all             // we know the threads are done             semaphore.tryAcquire(count, 60, TimeUnit.SECONDS);             // do general asserts about channels             a.verify(channels);             // kill random member

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

190 191 192 193 194 195 196 197 198 199 200                 }, null);             }         }         // 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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