Example usage for java.util.concurrent.locks ReentrantReadWriteLock writeLock

Introduction

In this page you can find the example usage for java.util.concurrent.locks ReentrantReadWriteLock writeLock.

Prototype

public ReentrantReadWriteLock.WriteLock writeLock()

Source Link

Usage

From source file:org.polymap.core.runtime.LockUtils.java

/**
 * Simply *release* read lock and aquire write lock afterwards.
 * <p>//from ww  w .j  av a 2 s . c om
 * This is not a real upgrade as the real locl is <b>released</b>
 * before the write lock is aquired!
 * 
 * @param rwLock
 */
public static void upgrade(ReentrantReadWriteLock rwLock) {
    rwLock.readLock().unlock();
    rwLock.writeLock().lock();
}

From source file:com.aerospike.delivery.db.base.Database.java

public static boolean withWriteLock(ReentrantReadWriteLock lock, Callable<Boolean> action) {
    lock.writeLock().lock();
    try {/*from   ww w  .  j a  va  2 s. c  o  m*/
        return action.call();
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    } finally {
        lock.writeLock().unlock();
    }
}

From source file:org.polymap.core.runtime.LockUtils.java

/**
 * Executes the given callable inside read lock of the given lock. The call()
 * method may aquire the write lock during execution. Both locks are released
 * after this method returns./*from w ww  .  j  a v  a  2s.co  m*/
 * 
 * @param <V>
 * @param rwLock
 * @param task
 * @return The result of the given {@link #task}.
 * @throws Exception The exception from the {@link #task}.
 */
public static <V> V withReadLock(ReentrantReadWriteLock rwLock, Callable<V> task) throws Exception {
    try {
        rwLock.readLock().lock();

        return task.call();
    } finally {
        if (rwLock.writeLock().isHeldByCurrentThread()) {
            rwLock.readLock().lock();
            rwLock.writeLock().unlock();
        }
        rwLock.readLock().unlock();
    }
}

From source file:Main.java

public static boolean saveContentToFile(byte[] content, File fileForSave) {
    ReentrantReadWriteLock.WriteLock writeLock = getLock(fileForSave.getAbsolutePath()).writeLock();
    boolean succeed = true;
    FileOutputStream out = null;//from  ww w. ja  va 2  s  .  co  m
    if (writeLock.tryLock()) {
        try {
            out = new FileOutputStream(fileForSave, false);
            out.write(content);
        } catch (Exception var9) {
            //log.d(var9.toString());
            succeed = false;
        } finally {
            if (out != null) {
                closeQuietly(out);
            }

            writeLock.unlock();
        }
    }

    return succeed;
}

From source file:com.espertech.esper.core.StatementRWLockImpl.java

/**
 * Ctor.//from w w w. j  av a 2 s .  co  m
 * @param name of lock
 * @param isFair true if a fair lock, false if not
 */
public StatementRWLockImpl(String name, boolean isFair) {
    this.name = name;
    ReentrantReadWriteLock lock = new ReentrantReadWriteLock(isFair);
    writeLock = lock.writeLock();
    readLock = lock.readLock();
}

From source file:com.espertech.esper.multithread.TestMTIsolation.java

private void tryIsolated(int numThreads, int numLoops) throws Exception {
    Configuration config = SupportConfigFactory.getConfiguration();
    config.getEngineDefaults().getViewResources().setShareViews(false);
    config.addEventType("SupportBean", SupportBean.class);
    EPServiceProvider engine = EPServiceProviderManager.getDefaultProvider(config);
    engine.initialize();// w  w  w.  j ava2  s  . co  m

    // execute
    ExecutorService threadPool = Executors.newFixedThreadPool(numThreads);
    Future future[] = new Future[numThreads];
    ReentrantReadWriteLock sharedStartLock = new ReentrantReadWriteLock();
    sharedStartLock.writeLock().lock();
    for (int i = 0; i < numThreads; i++) {
        future[i] = threadPool.submit(new IsolateUnisolateCallable(i, engine, numLoops));
    }
    Thread.sleep(100);
    sharedStartLock.writeLock().unlock();

    threadPool.shutdown();
    threadPool.awaitTermination(10, TimeUnit.SECONDS);

    for (int i = 0; i < numThreads; i++) {
        assertTrue((Boolean) future[i].get());
    }
}

From source file:org.apache.hadoop.yarn.server.resourcemanager.placement.PlacementManager.java

public PlacementManager() {
    ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    readLock = lock.readLock();
    writeLock = lock.writeLock();
}

From source file:com.amazonaws.internal.FIFOCache.java

/**
 * @param maxSize/*from   w  ww . java  2  s .co  m*/
 *            the maximum number of entries of the cache
 */
public FIFOCache(final int maxSize) {
    if (maxSize < 1) {
        throw new IllegalArgumentException("maxSize " + maxSize + " must be at least 1");
    }
    map = new BoundedLinkedHashMap<String, T>(maxSize);
    ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    rlock = lock.readLock();
    wlock = lock.writeLock();
}

From source file:org.apache.hadoop.yarn.server.resourcemanager.PendingEventRetrievalBatch.java

/**
 * @param rmContext/*from w  w w.j av  a  2s  .c o  m*/
 * @param period
 */
public PendingEventRetrievalBatch(RMContext rmContext, Configuration conf) {
    super(rmContext, conf);
    this.firstRetrieval = true;
    this.period = conf.getInt(YarnConfiguration.HOPS_PENDING_EVENTS_RETRIEVAL_PERIOD,
            YarnConfiguration.DEFAULT_HOPS_PENDING_EVENTS_RETRIEVAL_PERIOD);
    LOG.debug("PendingEventRetrieval period=" + period);
    this.pendingEvents = new HashMap<String, ConcurrentSkipListSet<PendingEvent>>();
    ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    this.writeLock = lock.writeLock();
}

From source file:org.bremersee.objectlock.ObjectReadWriteLockImpl.java

@Override
public void unlockWriting(Object obj) {

    if (obj == null) {
        return;//ww  w.  java  2s . c om
    }
    synchronized (locks) {
        ReentrantReadWriteLock l = locks.get(obj);
        if (l != null) {
            l.writeLock().unlock();
            if (l.getQueueLength() == 0) {
                l = locks.remove(obj);
                returnLock(l);
            }
        }
    }
}