java.util.concurrent.locks.ReentrantLock Java Examples

/**
 * Returns {@code true} if this queue contains the specified element.
 * More formally, returns {@code true} if and only if this queue contains
 * at least one element {@code e} such that {@code o.equals(e)}.
 *
 * @param o object to be checked for containment in this queue
 * @return {@code true} if this queue contains the specified element
 */
public boolean contains(Object o) {
    if (o == null) return false;
    final Object[] items = this.items;
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        if (count > 0) {
            final int putIndex = this.putIndex;
            int i = takeIndex;
            do {
                if (o.equals(items[i]))
                    return true;
                if (++i == items.length)
                    i = 0;
            } while (i != putIndex);
        }
        return false;
    } finally {
        lock.unlock();
    }
}
 

/**
 * Identity-based version for use in Itr.remove
 */
void removeEQ(Object o) {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        Object[] array = queue;
        for (int i = 0, n = size; i < n; i++) {
            if (o == array[i]) {
                removeAt(i);
                break;
            }
        }
    } finally {
        lock.unlock();
    }
}
 

/**
 * Atomically removes all of the elements from this deque.
 * The deque will be empty after this call returns.
 */
public void clear() {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        for (Node<E> f = first; f != null; ) {
            f.item = null;
            Node<E> n = f.next;
            f.prev = null;
            f.next = null;
            f = n;
        }
        first = last = null;
        count = 0;
        notFull.signalAll();
    } finally {
        lock.unlock();
    }
}
 

public void put(List<Event> data) throws InterruptedException, CanalStoreException {
    if (data == null || data.isEmpty()) {
        return;
    }

    final ReentrantLock lock = this.lock;
    lock.lockInterruptibly();
    try {
        try {
            while (!checkFreeSlotAt(putSequence.get() + data.size())) { // 检查是否有空位
                notFull.await(); // wait until not full
            }
        } catch (InterruptedException ie) {
            notFull.signal(); // propagate to non-interrupted thread
            throw ie;
        }
        doPut(data);
        if (Thread.interrupted()) {
            throw new InterruptedException();
        }
    } finally {
        lock.unlock();
    }
}
 

public void addQueue(final int pPriority, final int pCapacity, final int pInitialCapacity) {
	if (pCapacity <= 0) {
		throw new IllegalArgumentException("pCapacity must be greater than 0.");
	}

	if (pInitialCapacity <= 0) {
		throw new IllegalArgumentException("pInitialCapacity must be greater than 0.");
	}

	final ReentrantLock lock = this.mLock;
	lock.lock();

	try {
		this.mQueues.put(pPriority, new CircularList<T>(pInitialCapacity));
		this.mQueueCapacities.put(pPriority, pCapacity);
		this.mNotFullConditions.put(pPriority, this.mLock.newCondition());
	} finally {
		lock.unlock();
	}
}
 

public boolean removeFirstOccurrence(Object o) {
    if (o == null) return false;
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        for (Node<E> p = first; p != null; p = p.next) {
            if (o.equals(p.item)) {
                unlink(p);
                return true;
            }
        }
        return false;
    } finally {
        lock.unlock();
    }
}
 

public boolean awaitTermination(long timeout, TimeUnit unit)
    throws InterruptedException {
    long nanos = unit.toNanos(timeout);
    final ReentrantLock mainLock = this.mainLock;
    mainLock.lock();
    try {
        for (;;) {
            if (runStateAtLeast(ctl.get(), TERMINATED))
                return true;
            if (nanos <= 0)
                return false;
            nanos = termination.awaitNanos(nanos);
        }
    } finally {
        mainLock.unlock();
    }
}
 

@Inject
public EventBroker(
    ErrorReporter errorReporterRef,
    CommonSerializer commonSerializerRef,
    WatchStore watchStoreRef,
    Map<String, EventSerializer> eventSerializersRef,
    Map<String, EventSerializerDescriptor> eventSerializerDescriptorsRef
)
{
    errorReporter = errorReporterRef;
    commonSerializer = commonSerializerRef;
    watchStore = watchStoreRef;
    eventSerializers = eventSerializersRef;
    eventSerializerDescriptors = eventSerializerDescriptorsRef;

    watchLock = new ReentrantLock();
}
 

/**
 * Atomically removes all of the elements from this queue.
 * The queue will be empty after this call returns.
 */
public void clear() {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        int k = count;
        if (k > 0) {
            final Object[] items = this.items;
            final int putIndex = this.putIndex;
            int i = takeIndex;
            do {
                items[i] = null;
                if (++i == items.length) i = 0;
            } while (i != putIndex);
            takeIndex = putIndex;
            count = 0;
            if (itrs != null)
                itrs.queueIsEmpty();
            for (; k > 0 && lock.hasWaiters(notFull); k--)
                notFull.signal();
        }
    } finally {
        lock.unlock();
    }
}
 

/**
 * If lock is available, poll stale refs and remove them.
 * Called from ForkJoinPool when pools become quiescent.
 */
static final void helpExpungeStaleExceptions() {
    final ReentrantLock lock = exceptionTableLock;
    if (lock.tryLock()) {
        try {
            expungeStaleExceptions();
        } finally {
            lock.unlock();
        }
    }
}
 

/**
 * Returns the approximate total number of tasks that have ever been
 * scheduled for execution. Because the states of tasks and
 * threads may change dynamically during computation, the returned
 * value is only an approximation.
 *
 * @return the number of tasks
 */
public long getTaskCount() {
    final ReentrantLock mainLock = this.mainLock;
    mainLock.lock();
    try {
        long n = completedTaskCount;
        for (Worker w : workers) {
            n += w.completedTasks;
            if (w.isLocked())
                ++n;
        }
        return n + workQueue.size();
    } finally {
        mainLock.unlock();
    }
}
 

/** Constructor for a non-root MRR */
ConcreteResourceRegistration(final String valueString, final NodeSubregistry parent, final ResourceDefinition definition,
                             final AccessConstraintUtilizationRegistry constraintUtilizationRegistry,
                             final boolean ordered, CapabilityRegistry capabilityRegistry) {
    super(valueString, parent);
    this.constraintUtilizationRegistry = constraintUtilizationRegistry;
    this.capabilityRegistry = capabilityRegistry;
    this.resourceDefinition = definition;
    // If our parent is runtime-only, so are we, otherwise follow the definition
    this.runtimeOnly = parent.isRuntimeOnly() || definition.isRuntime();
    this.accessConstraintDefinitions = buildAccessConstraints();
    this.ordered = ordered;
    // For non-root MRRs we don't expect much in the way of concurrent reads in performance
    // critical situations, so we want lock/unlock to be as simple and fast as possible
    // So we just use a single non-r/w lock for both reads and writes
    this.readLock = this.writeLock = new ReentrantLock();
}
 

/**
 * @throws NullPointerException {@inheritDoc}
 * @throws InterruptedException {@inheritDoc}
 */
public boolean offerFirst(E e, long timeout, TimeUnit unit)
        throws InterruptedException {
    if (e == null) throw new NullPointerException();
    Node<E> node = new Node<E>(e);
    long nanos = unit.toNanos(timeout);
    final ReentrantLock lock = this.lock;
    lock.lockInterruptibly();
    try {
        while (!linkFirst(node)) {
            if (nanos <= 0)
                return false;
            nanos = notFull.awaitNanos(nanos);
        }
        return true;
    } finally {
        lock.unlock();
    }
}
 

@Override
public void stop() {
	final ReentrantLock lock = this.lock;
	lock.lock();
	try {
		if (isStop.compareAndSet(false, true)) {
			if (isChecking.get()) {
				// nothing
			} else {
				PostgreSQLDetector detector = this.detector;
				if (detector != null) {
					detector.quit();
					isChecking.set(false);
				}
			}
		}
	} finally {
		lock.unlock();
	}
}
 

public E pollLast(long timeout, TimeUnit unit)
    throws InterruptedException {
    long nanos = unit.toNanos(timeout);
    final ReentrantLock lock = this.lock;
    lock.lockInterruptibly();
    try {
        E x;
        while ( (x = unlinkLast()) == null) {
            if (nanos <= 0)
                return null;
            nanos = notEmpty.awaitNanos(nanos);
        }
        return x;
    } finally {
        lock.unlock();
    }
}
 

/**
 * Called to alert the {@link CaptureCollector} that the jpeg capture has begun.
 *
 * @param timestamp the time of the jpeg capture.
 * @return the {@link RequestHolder} for the request associated with this capture.
 */
public RequestHolder jpegCaptured(long timestamp) {
    final ReentrantLock lock = this.mLock;
    lock.lock();
    try {
        CaptureHolder h = mJpegCaptureQueue.poll();
        if (h == null) {
            Log.w(TAG, "jpegCaptured called with no jpeg request on queue!");
            return null;
        }
        h.setJpegTimestamp(timestamp);
        return h.mRequest;
    } finally {
        lock.unlock();
    }
}
 

/**
 * Returns the approximate total number of tasks that have ever been
 * scheduled for execution. Because the states of tasks and
 * threads may change dynamically during computation, the returned
 * value is only an approximation.
 *
 * @return the number of tasks
 */
public long getTaskCount() {
    final ReentrantLock mainLock = this.mainLock;
    mainLock.lock();
    try {
        long n = completedTaskCount;
        for (Worker w : workers) {
            n += w.completedTasks;
            if (w.isLocked())
                ++n;
        }
        return n + workQueue.size();
    } finally {
        mainLock.unlock();
    }
}
 

public void clear() {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        for (int i = 0; i < size; i++) {
            RunnableScheduledFuture<?> t = queue[i];
            if (t != null) {
                queue[i] = null;
                setIndex(t, -1);
            }
        }
        size = 0;
    } finally {
        lock.unlock();
    }
}
 

public List<E> subList(int fromIndex, int toIndex) {
    final ReentrantLock lock = l.lock;
    lock.lock();
    try {
        checkForComodification();
        if (fromIndex < 0 || toIndex > size || fromIndex > toIndex)
            throw new IndexOutOfBoundsException();
        return new COWSubList<E>(l, fromIndex + offset,
                                 toIndex + offset);
    } finally {
        lock.unlock();
    }
}
 

public void forEachRemaining(Consumer<? super E> action) {
    if (action == null) throw new NullPointerException();
    final LinkedBlockingDeque<E> q = this.queue;
    final ReentrantLock lock = q.lock;
    if (!exhausted) {
        exhausted = true;
        Node<E> p = current;
        do {
            E e = null;
            lock.lock();
            try {
                if (p == null)
                    p = q.first;
                while (p != null) {
                    e = p.item;
                    p = p.next;
                    if (e != null)
                        break;
                }
            } finally {
                lock.unlock();
            }
            if (e != null)
                action.accept(e);
        } while (p != null);
    }
}
 

/**
 * Initiates an orderly shutdown in which previously submitted
 * tasks are executed, but no new tasks will be accepted.
 * Invocation has no additional effect if already shut down.
 *
 * <p>This method does not wait for previously submitted tasks to
 * complete execution.  Use {@link #awaitTermination awaitTermination}
 * to do that.
 *
 * @throws SecurityException {@inheritDoc}
 */
public void shutdown() {
    final ReentrantLock mainLock = this.mainLock;
    mainLock.lock();
    try {
        checkShutdownAccess();
        advanceRunState(SHUTDOWN);
        interruptIdleWorkers();
        onShutdown(); // hook for ScheduledThreadPoolExecutor
    } finally {
        mainLock.unlock();
    }
    tryTerminate();
}
 

public SimpleTEDB(){
	log=LoggerFactory.getLogger("TEDBParser");		
	registeredAlgorithms= new ArrayList<TEDListener>();
	registeredAlgorithmssson= new ArrayList<SSONListener>();
	TEDBlock=new ReentrantLock();
	NodeTable = new Hashtable<Object, Node_Info>();
}
 

public E peek() {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        return (size == 0) ? null : (E) queue[0];
    } finally {
        lock.unlock();
    }
}
 

public void setJdbcUrl(final String string) {
    final ReentrantLock l = lock;
    l.lock();
    try {
        super.setUrl(string);
    } finally {
        l.unlock();
    }
}
 

public E peek() {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        return (size == 0) ? null : (E) queue[0];
    } finally {
        lock.unlock();
    }
}
 

/**
 * Removes exception node and clears status.
 */
private void clearExceptionalCompletion() {
    int h = System.identityHashCode(this);
    final ReentrantLock lock = exceptionTableLock;
    lock.lock();
    try {
        ExceptionNode[] t = exceptionTable;
        int i = h & (t.length - 1);
        ExceptionNode e = t[i];
        ExceptionNode pred = null;
        while (e != null) {
            ExceptionNode next = e.next;
            if (e.get() == this) {
                if (pred == null)
                    t[i] = next;
                else
                    pred.next = next;
                break;
            }
            pred = e;
            e = next;
        }
        expungeStaleExceptions();
        status = 0;
    } finally {
        lock.unlock();
    }
}
 

protected void setExpectedResult(Lock waitingLock,
                                 int numOwnedMonitors,
                                 Map<String, Lock[]> ownedMonitors,
                                 Condition waitingSync,
                                 int numOwnedSyncs,
                                 Map<String, ReentrantLock[]> ownedSyncs) {
    this.waitingLock = waitingLock;
    this.numOwnedMonitors = numOwnedMonitors;
    this.ownedMonitors = ownedMonitors;
    this.waitingSync = waitingSync;
    this.numOwnedSyncs = numOwnedSyncs;
    this.ownedSyncs = ownedSyncs;
}
 

public Object[] toArray() {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        return Arrays.copyOf(queue, size, Object[].class);
    } finally {
        lock.unlock();
    }
}
 

/**
 * Atomically removes all of the elements from this queue.
 * The queue will be empty after this call returns.
 */
public void clear() {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        Object[] array = queue;
        int n = size;
        size = 0;
        for (int i = 0; i < n; i++)
            array[i] = null;
    } finally {
        lock.unlock();
    }
}
 

/**
 * Removes a single instance of the specified element from this
 * queue, if it is present, whether or not it has expired.
 */
public boolean remove(Object o) {
    final ReentrantLock lock = this.lock;
    lock.lock();
    try {
        return q.remove(o);
    } finally {
        lock.unlock();
    }
}