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.




    @Override
    public WebResourceRoot getResources() {
        Lock readLock = resourcesLock.readLock();
        readLock.lock();
        try {
            return resources;
        } finally {
            readLock.unlock();
        }

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                }
            }
        }


        final Lock readLock = cacheValue.getLock().readLock();
        readLock.lock();
        try {
            factory = cacheValue.getExpressionFactory();
        } finally {
            readLock.unlock();
        }

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        }


        if (factory == null) {
            final Lock writeLock = cacheValue.getLock().writeLock();
            try {
                writeLock.lock();
                factory = cacheValue.getExpressionFactory();
                if (factory == null) {
                    factory = ExpressionFactory.newInstance();
                    cacheValue.setExpressionFactory(factory);
                }

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     * Locks a tag file path. Use this before loading it.
     * @param tagFilePath Tag file path
     */
    public void lockTagFileLoading(final String tagFilePath) {
        final Lock lock = getTagFileLoadingLock(tagFilePath);
        lock.lock();
    }


    /**
     * Unlocks a tag file path. Use this after loading it.
     * @param tagFilePath Tag file path

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   */
  protected Lock acquireReadLock()
  {
    if (null == _readWriteLock) return null;
    Lock readLock = _readWriteLock.readLock();
    readLock.lock();
    return readLock;
  }


  /**
   * Obtains a write lock if required. If the lock is acquired in a relation with another lock,

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            Dictionary loaded = ( Dictionary ) cache.get( pid );
            if ( loaded == null && !fullyLoaded )
            {
                lock.unlock();
                lock = globalLock.writeLock();
                lock.lock();
                loaded = ( Dictionary ) cache.get( pid );
                if ( loaded == null )
                {
                    loaded = pm.load(pid);
                    cache.put(pid, loaded);

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     */
    public void store( String pid, Dictionary properties ) throws IOException
    {
        Lock lock = globalLock.writeLock();
        try {
            lock.lock();
            pm.store( pid, properties );
            cache.put( pid, copy( properties ) );
        } finally {
            lock.unlock();
        }

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     */
    public void delete( String pid ) throws IOException
    {
        Lock lock = globalLock.writeLock();
        try {
            lock.lock();
            cache.remove( pid );
            pm.delete(pid);
        } finally {
            lock.unlock();
        }

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     */
    public boolean exists( String pid )
    {
        Lock lock = globalLock.readLock();
        try {
            lock.lock();
            return cache.containsKey( pid ) || ( !fullyLoaded && pm.exists( pid ) );
        } finally {
            lock.unlock();
        }
    }

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     */
    public Enumeration getDictionaries() throws IOException
    {
        Lock lock = globalLock.readLock();
        try {
            lock.lock();
            // if not fully loaded, call back to the underlying persistence
            // manager and cach all dictionaries whose service.pid is set
            if ( !fullyLoaded )
            {
                lock.unlock();

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