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

Introduction

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

Prototype

public ReentrantReadWriteLock.ReadLock readLock()

Source Link

Usage

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

/**
 * Simply *release* read lock and aquire write lock afterwards.
 * <p>//from w  w w  .  j ava 2s  .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: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 w  w.j  av a  2s  . c o 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:com.aerospike.delivery.db.base.Database.java

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

From source file:Main.java

public static byte[] readContentBytesFromFile(File fileForRead) {
    if (fileForRead == null) {
        return null;
    } else if (fileForRead.exists() && fileForRead.isFile()) {
        ReentrantReadWriteLock.ReadLock readLock = getLock(fileForRead.getAbsolutePath()).readLock();
        readLock.lock();//w  w w . j  av  a2s.c om
        Object data = null;
        BufferedInputStream input = null;

        try {
            byte[] data1 = new byte[(int) fileForRead.length()];
            int e = 0;
            input = new BufferedInputStream(new FileInputStream(fileForRead), 8192);

            while (e < data1.length) {
                int bytesRemaining = data1.length - e;
                int bytesRead = input.read(data1, e, bytesRemaining);
                if (bytesRead > 0) {
                    e += bytesRead;
                }
            }

            byte[] bytesRemaining1 = data1;
            return bytesRemaining1;
        } catch (IOException var10) {
        } finally {
            closeQuietly(input);
            readLock.unlock();
        }

        return null;
    } else {
        return null;
    }
}

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 w  w  . j  av a  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:com.espertech.esper.core.StatementRWLockImpl.java

/**
 * Ctor./*from  www. java2 s. com*/
 * @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:org.jactr.core.module.declarative.search.map.SortedValueMap.java

@Override
public Collection<I> lessThan(V value) {
    if (value == null)
        throw new NullPointerException("null values are not permitted as keys");

    Set<I> rtn = instantiateReturnSet();
    ReentrantReadWriteLock lock = getLock();
    try {//from  w  ww  .ja  va 2  s. co  m
        lock.readLock().lock();

        for (V tmpValue : _sortedValues.headSet(value))
            rtn.addAll(get(tmpValue));

        //      TreeMap<V, Collection<I>> coreMap = (TreeMap<V, Collection<I>>) getCoreMap();
        //
        //      Map<V, Collection<I>> head = coreMap.headMap(value);
        //      for (Collection<I> values : head.values())
        //        if (values != null) rtn.addAll(values);
        return rtn;
    } finally {
        lock.readLock().unlock();
    }
}

From source file:org.jactr.core.module.declarative.search.map.SortedValueMap.java

@Override
public Collection<I> greaterThan(V value) {
    if (value == null)
        throw new NullPointerException("null values are not permitted as keys");

    Set<I> rtn = instantiateReturnSet();
    ReentrantReadWriteLock lock = getLock();
    try {//from  w w  w  .j a  v  a  2  s . com
        lock.readLock().lock();

        for (V tmpValue : _sortedValues.tailSet(value))
            if (!tmpValue.equals(value))
                rtn.addAll(get(tmpValue));

        //      TreeMap<V, Collection<I>> coreMap = (TreeMap<V, Collection<I>>) getCoreMap();
        //
        //      Map<V, Collection<I>> tail = coreMap.tailMap(value);
        //      for (V tmpValue : tail.keySet())
        //      {
        //        if (!tmpValue.equals(value)) rtn.addAll(get(tmpValue));
        //      }
        return rtn;
    } finally {
        lock.readLock().unlock();
    }
}

From source file:org.alfresco.util.registry.NamedObjectRegistry.java

/**
 * Default constructor.  The {@link #setStorageType(Class)} method must be called.
 *//*from w  w w  .j  av a 2  s . com*/
public NamedObjectRegistry() {
    ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    readLock = lock.readLock();
    writeLock = lock.writeLock();
    this.namePattern = null; // Deliberately null
    this.storageType = null; // Deliberately null
    this.objects = new HashMap<String, T>(13);
}