Package java.util.concurrent.locks.ReentrantReadWriteLock

Examples of java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock

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        /**
         * {@inheritDoc}
         */
        @Override
        public void clear() throws Exception, UnsupportedOperationException {
            WriteLock writeLock = readWriteLock.writeLock();
            writeLock.lock();
            try {
                pool.clear();
            } finally {
                writeLock.unlock();
            }
        }
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        /**
         * {@inheritDoc}
         */
        @Override
        public void close() {
            WriteLock writeLock = readWriteLock.writeLock();
            writeLock.lock();
            try {
                pool.close();
            } catch (Exception e) {
                // swallowed as of Pool 2
            } finally {
                writeLock.unlock();
            }
        }
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        if (closed) {
            throw new IOException(sm.getString("apr.closed", Long.valueOf(socket)));
        }

        Lock readLock = wrapper.getBlockingStatusReadLock();
        WriteLock writeLock = wrapper.getBlockingStatusWriteLock();

        try {
            readLock.lock();
            if (wrapper.getBlockingStatus() == block) {
                return doWriteInternal(b, off, len);
            }
        } finally {
            readLock.unlock();
        }

        try {
            writeLock.lock();
            // Set the current settings for this socket
            wrapper.setBlockingStatus(block);
            if (block) {
                Socket.timeoutSet(socket, endpoint.getSoTimeout() * 1000);
            } else {
                Socket.timeoutSet(socket, 0);
            }

            // Downgrade the lock
            try {
                readLock.lock();
                writeLock.unlock();
                return doWriteInternal(b, off, len);
            } finally {
                readLock.unlock();
            }
        } finally {
            // Should have been released above but may not have been on some
            // exception paths
            if (writeLock.isHeldByCurrentThread()) {
                writeLock.unlock();
            }
        }
    }
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        if (closed) {
            throw new IOException(sm.getString("apr.closed", Long.valueOf(socket)));
        }

        Lock readLock = wrapper.getBlockingStatusReadLock();
        WriteLock writeLock = wrapper.getBlockingStatusWriteLock();

        boolean readDone = false;
        int result = 0;
        try {
            readLock.lock();
            if (wrapper.getBlockingStatus() == block) {
                result = Socket.recv(socket, b, off, len);
                readDone = true;
            }
        } finally {
            readLock.unlock();
        }

        if (!readDone) {
            try {
                writeLock.lock();
                wrapper.setBlockingStatus(block);
                // Set the current settings for this socket
                Socket.optSet(socket, Socket.APR_SO_NONBLOCK, (block ? 0 : 1));
                // Downgrade the lock
                try {
                    readLock.lock();
                    writeLock.unlock();
                    result = Socket.recv(socket, b, off, len);
                } finally {
                    readLock.unlock();
                }
            } finally {
                // Should have been released above but may not have been on some
                // exception paths
                if (writeLock.isHeldByCurrentThread()) {
                    writeLock.unlock();
                }
            }
        }

        if (result > 0) {
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        /* to be safe we just create a new
         * datatree.
         */
        dataTree = new DataTree();
        sessionsWithTimeouts.clear();
        WriteLock lock = logLock.writeLock();
        try {           
            lock.lock();
            committedLog.clear();
        } finally {
            lock.unlock();
        }
        initialized = false;
    }
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     *  or so committed requests. This is used for
     * fast follower synchronization.
     * @param request committed request
     */
    public void addCommittedProposal(Request request) {
        WriteLock wl = logLock.writeLock();
        try {
            wl.lock();
            if (committedLog.size() > commitLogCount) {
                committedLog.removeFirst();
                minCommittedLog = committedLog.getFirst().packet.getZxid();
            }
            if (committedLog.size() == 0) {
                minCommittedLog = request.zxid;
                maxCommittedLog = request.zxid;
            }

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            BinaryOutputArchive boa = BinaryOutputArchive.getArchive(baos);
            try {
                request.hdr.serialize(boa, "hdr");
                if (request.txn != null) {
                    request.txn.serialize(boa, "txn");
                }
                baos.close();
            } catch (IOException e) {
                LOG.error("This really should be impossible", e);
            }
            QuorumPacket pp = new QuorumPacket(Leader.PROPOSAL, request.zxid,
                    baos.toByteArray(), null);
            Proposal p = new Proposal();
            p.packet = pp;
            p.request = request;
            committedLog.add(p);
            maxCommittedLog = p.packet.getZxid();
        } finally {
            wl.unlock();
        }
    }
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    private int writeSocket(int pos, int len, boolean block) {

        Lock readLock = socketWrapper.getBlockingStatusReadLock();
        WriteLock writeLock = socketWrapper.getBlockingStatusWriteLock();
        long socket = socketWrapper.getSocket().longValue();

        boolean writeDone = false;
        int result = 0;
        try {
            readLock.lock();
            if (socketWrapper.getBlockingStatus() == block) {
                result = Socket.sendbb(socket, pos, len);
                writeDone = true;
            }
        } finally {
            readLock.unlock();
        }

        if (!writeDone) {
            try {
                writeLock.lock();
                socketWrapper.setBlockingStatus(block);
                // Set the current settings for this socket
                Socket.optSet(socket, Socket.APR_SO_NONBLOCK, (block ? 0 : 1));
                // Downgrade the lock
                try {
                    readLock.lock();
                    writeLock.unlock();
                    result = Socket.sendbb(socket, pos, len);
                } finally {
                    readLock.unlock();
                }
            } finally {
                // Should have been released above but may not have been on some
                // exception paths
                if (writeLock.isHeldByCurrentThread()) {
                    writeLock.unlock();
                }
            }
        }

        return result;
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    private int readSocket(int pos, int len, boolean block) {

        Lock readLock = socketWrapper.getBlockingStatusReadLock();
        WriteLock writeLock = socketWrapper.getBlockingStatusWriteLock();
        long socket = socketWrapper.getSocket().longValue();

        boolean readDone = false;
        int result = 0;
        try {
            readLock.lock();
            if (socketWrapper.getBlockingStatus() == block) {
                result = Socket.recvbb(socket, pos, len);
                readDone = true;
            }
        } finally {
            readLock.unlock();
        }

        if (!readDone) {
            try {
                writeLock.lock();
                socketWrapper.setBlockingStatus(block);
                // Set the current settings for this socket
                Socket.optSet(socket, Socket.APR_SO_NONBLOCK, (block ? 0 : 1));
                // Downgrade the lock
                try {
                    readLock.lock();
                    writeLock.unlock();
                    result = Socket.recvbb(socket, pos, len);
                } finally {
                    readLock.unlock();
                }
            } finally {
                // Should have been released above but may not have been on some
                // exception paths
                if (writeLock.isHeldByCurrentThread()) {
                    writeLock.unlock();
                }
            }
        }

        return result;
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        if (closed) {
            throw new IOException(sm.getString("apr.closed", Long.valueOf(socket)));
        }

        Lock readLock = socketWrapper.getBlockingStatusReadLock();
        WriteLock writeLock = socketWrapper.getBlockingStatusWriteLock();

        try {
            readLock.lock();
            if (socketWrapper.getBlockingStatus() == block) {
                return doWriteInternal(b, off, len);
            }
        } finally {
            readLock.unlock();
        }

        try {
            writeLock.lock();
            // Set the current settings for this socket
            socketWrapper.setBlockingStatus(block);
            if (block) {
                Socket.timeoutSet(socket, endpoint.getSoTimeout() * 1000);
            } else {
                Socket.timeoutSet(socket, 0);
            }

            // Downgrade the lock
            try {
                readLock.lock();
                writeLock.unlock();
                return doWriteInternal(b, off, len);
            } finally {
                readLock.unlock();
            }
        } finally {
            // Should have been released above but may not have been on some
            // exception paths
            if (writeLock.isHeldByCurrentThread()) {
                writeLock.unlock();
            }
        }
    }
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    }
  }

  public void testLock() {
    ReentrantReadWriteLock lock;
    WriteLock w;
    ReadLock r;

    lock = new ReentrantReadWriteLock();
    w = lock.writeLock();
    r = lock.readLock();
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