Example usage for java.util.concurrent.locks Lock unlock

Introduction

In this page you can find the example usage for java.util.concurrent.locks Lock unlock.

Prototype

void unlock();

Source Link

Document

Releases the lock.

Usage

From source file:org.apache.hadoop.hbase.util.CoprocessorClassLoader.java

/**
 * Get a CoprocessorClassLoader for a coprocessor jar path from cache.
 * If not in cache, create one./*from  www  .j a  v a  2s  .  com*/
 *
 * @param path the path to the coprocessor jar file to load classes from
 * @param parent the parent class loader for exempted classes
 * @param pathPrefix a prefix used in temp path name to store the jar file locally
 * @param conf the configuration used to create the class loader, if needed
 * @return a CoprocessorClassLoader for the coprocessor jar path
 * @throws IOException
 */
public static CoprocessorClassLoader getClassLoader(final Path path, final ClassLoader parent,
        final String pathPrefix, final Configuration conf) throws IOException {
    CoprocessorClassLoader cl = getIfCached(path);
    String pathStr = path.toString();
    if (cl != null) {
        LOG.debug("Found classloader " + cl + " for " + pathStr);
        return cl;
    }

    if (!pathStr.endsWith(".jar")) {
        throw new IOException(pathStr + ": not a jar file?");
    }

    Lock lock = locker.acquireLock(pathStr);
    try {
        cl = getIfCached(path);
        if (cl != null) {
            LOG.debug("Found classloader " + cl + " for " + pathStr);
            return cl;
        }

        cl = AccessController.doPrivileged(new PrivilegedAction<CoprocessorClassLoader>() {
            @Override
            public CoprocessorClassLoader run() {
                return new CoprocessorClassLoader(parent);
            }
        });

        cl.init(path, pathPrefix, conf);

        // Cache class loader as a weak value, will be GC'ed when no reference left
        CoprocessorClassLoader prev = classLoadersCache.putIfAbsent(path, cl);
        if (prev != null) {
            // Lost update race, use already added class loader
            LOG.warn("THIS SHOULD NOT HAPPEN, a class loader" + " is already cached for " + pathStr);
            cl = prev;
        }
        return cl;
    } finally {
        lock.unlock();
    }
}

From source file:com.cloudera.oryx.als.serving.ServerRecommender.java

private static float[] getFeatures(long longID, LongObjectMap<float[]> matrix, ReadWriteLock lock) {
    float[] features;
    Lock readLock = lock.readLock();
    readLock.lock();/*  www  .  j  a  v a  2 s. co m*/
    try {
        features = matrix.get(longID);
        if (features == null) {
            int numFeatures = countFeatures(matrix);
            if (numFeatures > 0) {
                features = new float[numFeatures];
                Lock writeLock = lock.writeLock();
                readLock.unlock();
                writeLock.lock();
                try {
                    matrix.put(longID, features);
                } finally {
                    readLock.lock();
                    writeLock.unlock();
                }
            }
        }
    } finally {
        readLock.unlock();
    }
    return features;
}

From source file:info.pancancer.arch3.worker.CollectingLogOutputStream.java

/**
 * Get the last *n* lines in the log./*from  www  .  ja  v  a 2 s  .c  o  m*/
 * 
 * @param n
 *            - The number of lines to get.
 * @return A list of strings.
 */
public List<String> getLastNLines(int n) {
    Lock lock = new ReentrantLock();
    lock.lock();
    List<String> nlines = new ArrayList<String>(n);
    int start, end;
    end = this.lines.size();
    start = Math.max(0, this.lines.size() - n);
    if (end > start && start >= 0) {
        nlines = this.lines.subList(start, end);
    }
    lock.unlock();
    return nlines;
}

From source file:com.cloudera.oryx.ml.speed.als.ALSSpeedModel.java

public void setUserVector(String user, float[] vector) {
    Preconditions.checkNotNull(vector);/*from   w ww  .j ava2  s .com*/
    Preconditions.checkArgument(vector.length == features);
    Lock lock = xLock.writeLock();
    lock.lock();
    try {
        if (X.put(user, vector) == null) {
            // User was actually new
            recentNewUsers.add(user);
        }
    } finally {
        lock.unlock();
    }
}

From source file:com.cloudera.oryx.ml.speed.als.ALSSpeedModel.java

public void setItemVector(String item, float[] vector) {
    Preconditions.checkNotNull(vector);//w ww . j  a v a 2  s.com
    Preconditions.checkArgument(vector.length == features);
    Lock lock = yLock.writeLock();
    lock.lock();
    try {
        if (Y.put(item, vector) == null) {
            // Item was actually new
            recentNewItems.add(item);
        }
    } finally {
        lock.unlock();
    }
}

From source file:SoftReferenceCache.java

/**
 * @see java.util.Map#get(java.lang.Object)
 *//*ww w .ja va2  s .  co  m*/
public V get(Object key) {
    Lock lock = theLock.readLock();
    lock.lock();
    try {
        KeyedSoftReference<V> val = theCache.get(key);
        return val == null ? null : val.get();
    } finally {
        lock.unlock();
    }
}

From source file:SoftReferenceCache.java

/**
 * @see java.util.Map#containsKey(java.lang.Object)
 *///from  w  w  w.  j a v a2  s . co  m
public boolean containsKey(Object key) {
    Lock lock = theLock.readLock();
    lock.lock();
    try {
        KeyedSoftReference<V> val = theCache.get(key);
        return val == null || val.isEnqueued();
    } finally {
        lock.unlock();
    }
}

From source file:org.springframework.integration.metadata.PropertiesPersistingMetadataStore.java

@Override
public void put(String key, String value) {
    Assert.notNull(key, "'key' cannot be null");
    Assert.notNull(value, "'value' cannot be null");
    Lock lock = this.lockRegistry.obtain(key);
    lock.lock();/*from   w ww. j a  v  a  2  s. c o  m*/
    try {
        this.metadata.setProperty(key, value);
    } finally {
        this.dirty = true;
        lock.unlock();
    }
}

From source file:org.nuxeo.ecm.platform.wi.filter.WIRequestFilter.java

protected void simpleReleaseSyncOnSession(HttpServletRequest request) {
    /*//from w  ww.j a v  a  2s  .  c  o  m
     * HttpSession httpSession = request.getSession(false); if (httpSession
     * == null) { if (log.isDebugEnabled()) { log.debug(doFormatLogMessage(
     * request,
     * "No more HttpSession : can not unlock !, HttpSession must have been invalidated"
     * )); } return; }
     */

    WISession session = (WISession) request.getAttribute(SESSION_KEY);

    log.debug("Trying to unlock on httpSession key " + session.getKey() + " WISession:" + session.getKey()
            + " on Thread " + Thread.currentThread().getId());

    Lock lock = (Lock) session.getAttribute(SESSION_LOCK_KEY);
    if (lock == null) {
        log.error("Unable to find session lock, HttpSession may have been invalidated");
    } else {
        lock.unlock();
        if (log.isDebugEnabled()) {
            log.debug("session unlocked on Thread ");
            log.debug(doExecutionRequestLogMessage(request));
        }
    }
}

From source file:org.springframework.integration.metadata.PropertiesPersistingMetadataStore.java

@Override
public String remove(String key) {
    Assert.notNull(key, "'key' cannot be null");
    Lock lock = this.lockRegistry.obtain(key);
    lock.lock();//ww w  .  j a va 2 s. c  om
    try {
        return (String) this.metadata.remove(key);
    } finally {
        this.dirty = true;
        lock.unlock();
    }
}