Examples of java.util.concurrent.locks.Lock.lock()

java.util.concurrent.locks.Lock.lock()
Acquires the lock.
If the lock is not available then the current thread becomes disabled for thread scheduling purposes and lies dormant until the lock has been acquired.
Implementation Considerations
A {@code Lock} implementation may be able to detect erroneous useof the lock, such as an invocation that would cause deadlock, and may throw an (unchecked) exception in such circumstances. The circumstances and the exception type must be documented by that {@code Lock} implementation.

                                                          boolean checkConditions) {
        ConcurrentSkipListMap<String, T> map = getMap(collection);
        T oldDoc;


        Lock lock = rwLock.writeLock();
        lock.lock();
        try {
            // get the node if it's there
            oldDoc = map.get(update.id);


            T doc = collection.newDocument(this);

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    @Override
    public <T extends Document> boolean create(Collection<T> collection,
                                               List<UpdateOp> updateOps) {
        Lock lock = rwLock.writeLock();
        lock.lock();
        try {
            ConcurrentSkipListMap<String, T> map = getMap(collection);
            for (UpdateOp op : updateOps) {
                if (map.containsKey(op.id)) {
                    return false;

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    @Override
    public <T extends Document> void update(Collection<T> collection,
                                            List<String> keys,
                                            UpdateOp updateOp) {
        Lock lock = rwLock.writeLock();
        lock.lock();
        try {
            ConcurrentSkipListMap<String, T> map = getMap(collection);
            for (String key : keys) {
                if (!map.containsKey(key)) {
                    continue;

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    else {
      Class<?> c = locatedClasses.get(className);
      if(c != null)
        return c;
      Lock rLock = ifacesLock.readLock();
      rLock.lock();
      try {
        Set<ClassLoader> cls = new HashSet<ClassLoader>();
        for(Class<?> iface : ifaces) {
          if(cls.add(iface.getClassLoader())) {
            try {

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        classes.remove(createSet);
      }
    }
    
    Lock wLock = ifacesLock.writeLock();
    wLock.lock();
    try {
      ifaces.addAll(createSet);
    } finally {
      wLock.unlock();
    }

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        final Lock currLock = instance.getLock();
        final boolean lockAcquired;
        if (accessTimeout == null || accessTimeout.getTime() < 0) {
            // wait indefinitely for a lock
            currLock.lock();
            lockAcquired = true;
        } else if (accessTimeout.getTime() == 0) {
            // concurrent calls are not allowed, lock only once
        lockAcquired = currLock.tryLock();
      } else {

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    @Override
    public Loader getLoader() {
        Lock readLock = loaderLock.readLock();
        readLock.lock();
        try {
            return loader;
        } finally {
            readLock.unlock();
        }

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    @Override
    public void setLoader(Loader loader) {


        Lock writeLock = loaderLock.writeLock();
        writeLock.lock();
        Loader oldLoader = null;
        try {
            // Change components if necessary
            oldLoader = this.loader;
            if (oldLoader == loader)

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    @Override
    public Manager getManager() {
        Lock readLock = managerLock.readLock();
        readLock.lock();
        try {
            return manager;
        } finally {
            readLock.unlock();
        }

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    @Override
    public void setManager(Manager manager) {


        Lock writeLock = managerLock.writeLock();
        writeLock.lock();
        Manager oldManager = null;
        try {
            // Change components if necessary
            oldManager = this.manager;
            if (oldManager == manager)

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