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

Introduction

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

Prototype

public ReentrantReadWriteLock()

Source Link

Document

Creates a new ReentrantReadWriteLock with default (nonfair) ordering properties.

Usage

From source file:org.rhq.enterprise.server.util.concurrent.AlertSerializer.java

public void lock(int alertDefinitionId) {
    String msg = "tid= " + Thread.currentThread().getId() + ": alertDefinitionId=" + alertDefinitionId;
    boolean debug = this.log.isDebugEnabled();

    ReentrantReadWriteLock lock = null;
    logDebug(debug, msg, ": about to synchronize");
    synchronized (this) {
        logDebug(debug, msg, ": synchronized");
        lock = AlertSerializer.locks.get(alertDefinitionId);
        if (lock == null) {
            logDebug(debug, msg, ": creating new lock");
            lock = new ReentrantReadWriteLock();
            AlertSerializer.locks.put(alertDefinitionId, lock);
        }/*  w w  w.jav a 2  s. co m*/
    }

    logDebug(debug, msg, ": acquiring write lock");
    long start = System.currentTimeMillis();
    lock.writeLock().lock();
    long end = System.currentTimeMillis();
    long duration = end - start;
    AlertSerializer.lockTimes.put(alertDefinitionId, Long.valueOf(end));
    if (duration < 5000L) {
        logDebug(debug, msg, ": acquired write lock in millis=" + duration);
    } else {
        this.log.info(msg + ": acquired write lock in millis=" + duration);
    }

    return;
}

From source file:com.espertech.esper.filter.FilterParamIndexRange.java

/**
  * Constructs the index for matching ranges.
  * @param attributeName is the name of the event attribute field
 * @param filterOperator is the type of range
 * @param eventType is type of events handled
 *//*from  ww w  .  j  av  a 2 s.c  o m*/
public FilterParamIndexRange(String attributeName, FilterOperator filterOperator, EventType eventType) {
    super(attributeName, filterOperator, eventType);

    ranges = new TreeMap<DoubleRange, EventEvaluator>(new DoubleRangeComparator());
    rangesRWLock = new ReentrantReadWriteLock();

    if (!(filterOperator.isRangeOperator())) {
        throw new IllegalArgumentException("Invalid filter operator " + filterOperator);
    }
}

From source file:org.apache.servicemix.jbi.cluster.engine.ReconnectTest.java

public void testLoadInOnly() throws Exception {
    createRoute(Transacted.Jms, true, false, false);

    final int nbThreads = 10;
    final int nbExchanges = 10;
    final ReadWriteLock lock = new ReentrantReadWriteLock();
    final CountDownLatch latch = new CountDownLatch(nbThreads);
    final AtomicInteger id = new AtomicInteger();
    lock.writeLock().lock();//from  w w  w.  j  a v  a  2 s .c  om
    for (int i = 0; i < nbThreads; i++) {
        new Thread() {
            public void run() {
                Channel client = null;
                try {
                    client = nmr1.createChannel();
                    lock.readLock().lock();
                    for (int i = 0; i < nbExchanges; i++) {
                        Exchange exchange = client.createExchange(Pattern.InOnly);
                        exchange.getIn()
                                .setBody(new StringSource("<hello id='" + id.getAndIncrement() + "'/>"));
                        exchange.setTarget(nmr1.getEndpointRegistry()
                                .lookup(ServiceHelper.createMap(Endpoint.NAME, PROXY_ENDPOINT_NAME)));
                        client.sendSync(exchange);
                        assertEquals(Status.Done, exchange.getStatus());
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    lock.readLock().unlock();
                    latch.countDown();
                    if (client != null) {
                        client.close();
                    }
                }
            }
        }.start();
    }

    long t0, t1;

    cluster2.pause();

    t0 = System.currentTimeMillis();
    lock.writeLock().unlock();

    latch.await();

    broker.stop();
    cluster2.resume();

    Thread.sleep(500);
    broker = createBroker(false);

    receiver.assertExchangesReceived(nbThreads * nbExchanges, TIMEOUT);
    //Thread.sleep(500);
    //receiver.assertExchangesReceived(nbThreads * nbExchanges, TIMEOUT);

    t1 = System.currentTimeMillis();

    System.err.println("Elapsed time: " + (t1 - t0) + " ms");
    System.err.println("Throuput: " + (nbThreads * nbExchanges * 1000 / (t1 - t0)) + " messages/sec");
}

From source file:com.espertech.esper.filter.FilterParamIndexNotRange.java

/**
  * Constructs the index for matching ranges.
  * @param attributeName is the name of the event attribute field
 * @param filterOperator is the type of range
 * @param eventType is type of events handled
 *//* ww w .  ja va 2 s .  co m*/
public FilterParamIndexNotRange(String attributeName, FilterOperator filterOperator, EventType eventType) {
    super(attributeName, filterOperator, eventType);

    ranges = new TreeMap<DoubleRange, EventEvaluator>(new DoubleRangeComparator());
    evaluators = new HashSet<EventEvaluator>();
    rangesRWLock = new ReentrantReadWriteLock();

    if (!(filterOperator.isInvertedRangeOperator())) {
        throw new IllegalArgumentException("Invalid filter operator " + filterOperator);
    }
}

From source file:com.mg.framework.service.DatabaseAuditServiceImpl.java

public DatabaseAuditServiceImpl(boolean isAuditActivated) {
    this.isAuditActivated = isAuditActivated;
    entityAuditSetup = new HashMap<String, EntityAuditSetup>();
    entityAuditSetupLock = new ReentrantReadWriteLock();
}

From source file:org.apereo.portal.utils.threading.DoubleCheckedCreator.java

public DoubleCheckedCreator() {
    this(new ReentrantReadWriteLock());
}

From source file:org.xwiki.store.FileDeleteTransactionRunnableTest.java

@Before
public void setUp() throws Exception {
    final File tmpDir = new File(System.getProperty("java.io.tmpdir"));
    this.storageLocation = new File(tmpDir, "test-storage" + System.identityHashCode(this.getClass()));

    this.toDelete = this.storageLocation;
    for (int i = 0; i < FILE_PATH.length; i++) {
        this.toDelete = new File(this.toDelete, FILE_PATH[i]);
    }/*from www .  j av  a2  s .  c  om*/
    this.temp = new File(this.toDelete.getParentFile(), FILE_PATH[FILE_PATH.length - 1] + "~tmp");
    this.toDelete.getParentFile().mkdirs();
    IOUtils.write("Delete me!", new FileOutputStream(this.toDelete));
    IOUtils.write("HAHA I am here to trip you up!", new FileOutputStream(this.temp));

    this.lock = new ReentrantReadWriteLock();

    this.runnable = new FileDeleteTransactionRunnable(this.toDelete, this.temp, this.lock);
}

From source file:com.openteach.diamond.repository.client.cache.HyBridLRUCache.java

/**
 * //from  w  ww.j a v a 2 s  .c  o  m
 * @param maxEntriesInMemory    ?
 * @param maxEntries         ? (maxEntries = maxEntriesInMemory + maxEntriesInFile)
 * @param fileName            local file name for file cache
 */
public HyBridLRUCache(int maxEntriesInMemory, int maxEntries, String fileName) {

    /**
     * 
     */
    memoryCache = new MemoryLRUCache<K, V>(maxEntriesInMemory);
    /**
     * File
     */
    fileCache = new FileLRUCache<K, V>(maxEntries, fileName);
    memoryCache.register(new ItemEliminateListener<K, V>() {

        @Override
        public void onEliminated(K key, V v) {
            try {
                _f_rw_lock_.writeLock().lock();
                fileCache.put(key, v);
            } finally {
                _f_rw_lock_.writeLock().unlock();
            }
        }

    });
    fileCache.register(new ItemEliminateListener<K, V>() {

        @Override
        public void onEliminated(K key, V v) {
            logger.warn(String.format("Eliminated one from file (local cache), key:%s", key.toString()));
        }

    });
    _m_rw_lock_ = new ReentrantReadWriteLock();
    _f_rw_lock_ = new ReentrantReadWriteLock();
}

From source file:org.pascani.dsl.lib.util.log4j2.PascaniAppender.java

private PascaniAppender(String name, Filter filter, Layout<? extends Serializable> layout,
        boolean ignoreExceptions) throws Exception {
    super(name, filter, layout, ignoreExceptions);
    this.readLock = new ReentrantReadWriteLock().readLock();
    this.producer = new RabbitMQProducer(PascaniRuntime.getEnvironment().get("logs_exchange"),
            this.getClass().getCanonicalName());
}

From source file:org.eclipse.nebula.widgets.nattable.selection.SelectionModel.java

public SelectionModel(SelectionLayer selectionLayer, boolean multipleSelectionAllowed) {
    this.selectionLayer = selectionLayer;
    this.multipleSelectionAllowed = multipleSelectionAllowed;

    selections = new LinkedList<Rectangle>();
    selectionsLock = new ReentrantReadWriteLock();
}