Example usage for java.nio.channels SelectionKey OP_WRITE

Introduction

In this page you can find the example usage for java.nio.channels SelectionKey OP_WRITE.

Prototype

int OP_WRITE

To view the source code for java.nio.channels SelectionKey OP_WRITE.

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Document

Operation-set bit for write operations.

Usage

From source file:com.facebook.infrastructure.net.TcpConnection.java

public void modifyKeyForWrite(SelectionKey key) {
    key.interestOps(key_.interestOps() | SelectionKey.OP_WRITE);
}

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From source file:com.taobao.gecko.core.nio.impl.Reactor.java

final void dispatchEvent(final Set<SelectionKey> selectedKeySet) {
    final Iterator<SelectionKey> it = selectedKeySet.iterator();
    boolean skipOpRead = false; // 
    while (it.hasNext()) {
        final SelectionKey key = it.next();
        it.remove();//  w ww.j  ava  2 s . co m
        if (!key.isValid()) {
            if (key.attachment() != null) {
                this.controller.closeSelectionKey(key);
            } else {
                key.cancel();
            }
            continue;
        }
        try {
            if (key.isAcceptable()) {
                this.controller.onAccept(key);
                continue;
            }
            if ((key.readyOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE) {
                // Remove write interest
                key.interestOps(key.interestOps() & ~SelectionKey.OP_WRITE);
                this.controller.onWrite(key);
                if (!this.controller.isHandleReadWriteConcurrently()) {
                    skipOpRead = true;
                }
            }
            if (!skipOpRead && (key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
                // read
                key.interestOps(key.interestOps() & ~SelectionKey.OP_READ);
                // 
                if (!this.controller.getStatistics().isReceiveOverFlow()) {
                    // Remove read interest

                    this.controller.onRead(key);// 
                    continue;
                } else {
                    key.interestOps(key.interestOps() // 
                            | SelectionKey.OP_READ);
                }

            }
            if ((key.readyOps() & SelectionKey.OP_CONNECT) == SelectionKey.OP_CONNECT) {
                this.controller.onConnect(key);
                continue;
            }

        } catch (final RejectedExecutionException e) {
            // 
            if (key.attachment() instanceof AbstractNioSession) {
                ((AbstractSession) key.attachment()).onException(e);
            }
            this.controller.notifyException(e);
            if (this.selector.isOpen()) {
                continue;
            } else {
                break;
            }
        } catch (final CancelledKeyException e) {
            // ignore
        } catch (final Exception e) {
            if (key.attachment() instanceof AbstractNioSession) {
                ((AbstractSession) key.attachment()).onException(e);
            }
            this.controller.closeSelectionKey(key);
            this.controller.notifyException(e);
            log.error("Reactor dispatch events error", e);
            if (this.selector.isOpen()) {
                continue;
            } else {
                break;
            }
        }
    }
}

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From source file:com.alibaba.napoli.gecko.core.nio.impl.Reactor.java

final void dispatchEvent(final Set<SelectionKey> selectedKeySet) {
    final Iterator<SelectionKey> it = selectedKeySet.iterator();
    boolean skipOpRead = false; // ?
    while (it.hasNext()) {
        final SelectionKey key = it.next();
        it.remove();/*from   w  w  w  .j  av a  2s. c  om*/
        if (!key.isValid()) {
            if (key.attachment() != null) {
                this.controller.closeSelectionKey(key);
            } else {
                key.cancel();
            }
            continue;
        }
        try {
            if (key.isAcceptable()) {
                this.controller.onAccept(key);
                continue;
            }
            if ((key.readyOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE) {
                // Remove write interest
                key.interestOps(key.interestOps() & ~SelectionKey.OP_WRITE);
                this.controller.onWrite(key);
                if (!this.controller.isHandleReadWriteConcurrently()) {
                    skipOpRead = true;
                }
            }
            if (!skipOpRead && (key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
                // read
                key.interestOps(key.interestOps() & ~SelectionKey.OP_READ);
                // ???
                if (!this.controller.getStatistics().isReceiveOverFlow()) {
                    // Remove read interest

                    this.controller.onRead(key);// ?
                    continue;
                } else {
                    key.interestOps(key.interestOps() // 
                            | SelectionKey.OP_READ);
                }

            }
            if ((key.readyOps() & SelectionKey.OP_CONNECT) == SelectionKey.OP_CONNECT) {
                this.controller.onConnect(key);
                continue;
            }

        } catch (final RejectedExecutionException e) {
            // ???
            if (key.attachment() instanceof AbstractNioSession) {
                ((AbstractSession) key.attachment()).onException(e);
            }
            this.controller.notifyException(e);
            if (this.selector.isOpen()) {
                continue;
            } else {
                break;
            }
        } catch (final CancelledKeyException e) {
            // ignore
        } catch (final Exception e) {
            if (key.attachment() instanceof AbstractNioSession) {
                ((AbstractSession) key.attachment()).onException(e);
            }
            this.controller.closeSelectionKey(key);
            this.controller.notifyException(e);
            log.error("Reactor dispatch events error", e);
            if (this.selector.isOpen()) {
                continue;
            } else {
                break;
            }
        }
    }
}

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From source file:de.kapsi.net.daap.nio.DaapServerNIO.java

/**
 * Notify all clients about an update of the Library
 *///from  w w w.jav  a2 s . c  o m
private void processUpdate() {

    Set keys = selector.keys();
    Iterator it = keys.iterator();
    while (it.hasNext()) {
        SelectionKey sk = (SelectionKey) it.next();
        SelectableChannel channel = (SelectableChannel) sk.channel();

        if (channel instanceof SocketChannel) {

            DaapConnection connection = (DaapConnection) sk.attachment();

            if (connection.isDaapConnection()) {
                try {
                    connection.update();
                    if (sk.isValid()) {
                        try {
                            sk.interestOps(SelectionKey.OP_READ | SelectionKey.OP_WRITE);
                        } catch (CancelledKeyException err) {
                            cancel(sk);
                            LOG.error("SelectionKey.interestOps()", err);
                        }
                    }
                } catch (ClosedChannelException err) {
                    cancel(sk);
                    LOG.error("DaapConnection.update()", err);
                } catch (IOException err) {
                    cancel(sk);
                    LOG.error("DaapConnection.update()", err);
                }
            }
        }
    }
}

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From source file:Proxy.java

String printSelectionOps(SelectionKey key) {
    StringBuilder sb = new StringBuilder();
    if ((key.readyOps() & SelectionKey.OP_ACCEPT) != 0)
        sb.append("OP_ACCEPT ");
    if ((key.readyOps() & SelectionKey.OP_CONNECT) != 0)
        sb.append("OP_CONNECT ");
    if ((key.readyOps() & SelectionKey.OP_READ) != 0)
        sb.append("OP_READ ");
    if ((key.readyOps() & SelectionKey.OP_WRITE) != 0)
        sb.append("OP_WRITE ");
    return sb.toString();
}

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From source file:net.timewalker.ffmq4.transport.tcp.nio.NIOTcpMultiplexer.java

protected void updateWriteInterest(NIOClientSocketHandler clientHandler, Selector selector) {
    SocketChannel socketChannel = clientHandler.getSocketChannel();
    if (!socketChannel.isOpen())
        return;// ww  w  .ja  va  2  s  . c  o  m
    if (!socketChannel.isConnected())
        return;

    // We are interested in writing only if there is something in the output buffer or
    // the handler expresses the need to write something
    if (clientHandler.getOutputBuffer().position() > 0 || clientHandler.hasWriteInterest())
        addInterest(socketChannel, SelectionKey.OP_WRITE, null, selector);
    else
        removeInterest(socketChannel, SelectionKey.OP_WRITE, selector);
}

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From source file:net.ymate.platform.serv.nio.support.NioSession.java

public void send(Object message) throws IOException {
    if (__selectionKey != null) {
        ByteBufferBuilder _msgBuffer = __eventGroup.codec().encode(message);
        if (_msgBuffer != null) {
            if (__writeBufferQueue.offer(_msgBuffer.buffer())) {
                __selectionKey.interestOps(__selectionKey.interestOps() | SelectionKey.OP_WRITE);
                __selectionKey.selector().wakeup();
            }//  w  w w  . j ava 2 s  .c  o  m
        }
    }
}

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From source file:org.apache.catalina.cluster.tcp.TcpReplicationThread.java

/**
 * Called to initiate a unit of work by this worker thread
 * on the provided SelectionKey object.  This method is
 * synchronized, as is the run() method, so only one key
 * can be serviced at a given time./*from   w w w .  ja v  a2 s.  co  m*/
 * Before waking the worker thread, and before returning
 * to the main selection loop, this key's interest set is
 * updated to remove OP_READ.  This will cause the selector
 * to ignore read-readiness for this channel while the
 * worker thread is servicing it.
 */
synchronized void serviceChannel(SelectionKey key, boolean synchronous) {
    this.key = key;
    this.synchronous = synchronous;
    key.interestOps(key.interestOps() & (~SelectionKey.OP_READ));
    key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE));
    this.notify(); // awaken the thread
}

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From source file:org.apache.htrace.impl.PackedBufferManager.java

/**
 * Send the provided ByteBuffer objects.
 *
 * We use non-blocking I/O because Java does not provide write timeouts.
 * Without a write timeout, the socket could get hung and we'd never recover.
 * We also use the GatheringByteChannel#write method which calls the pread()
 * system call under the covers.  This ensures that even if TCP_NODELAY is on,
 * we send the minimal number of packets.
 *//*from  ww w .j ava 2s.  co  m*/
private void doSend(SelectionKey sockKey, ByteBuffer[] bufs) throws IOException {
    long totalWritten = 0;
    sockKey.interestOps(SelectionKey.OP_WRITE);
    SocketChannel sock = (SocketChannel) sockKey.attachment();
    long startMs = TimeUtil.nowMs();
    long remainingMs = conf.ioTimeoutMs;
    while (true) {
        selector.select(remainingMs);
        int firstBuf = 0;
        for (SelectionKey key : selector.selectedKeys()) {
            if (key.isWritable()) {
                long written = sock.write(bufs, firstBuf, bufs.length - firstBuf);
                if (LOG.isTraceEnabled()) {
                    LOG.trace("Sent " + written + " bytes to " + conf.endpointStr);
                }
                totalWritten += written;
            }
        }
        while (true) {
            if (firstBuf == bufs.length) {
                if (LOG.isTraceEnabled()) {
                    LOG.trace("Finished sending " + totalWritten + " bytes to " + conf.endpointStr);
                }
                return;
            }
            if (bufs[firstBuf].remaining() > 0) {
                break;
            }
            firstBuf++;
        }
        remainingMs = updateRemainingMs(startMs, conf.ioTimeoutMs);
        if (remainingMs == 0) {
            throw new IOException("Attempt to write to " + conf.endpointStr + " timed out after "
                    + TimeUtil.deltaMs(startMs, TimeUtil.nowMs()) + " ms.");
        }
    }
}

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From source file:org.apache.synapse.transport.utils.logging.LoggingIOSession.java

private static String formatOps(int ops) {
    StringBuilder buffer = new StringBuilder(6);
    buffer.append('[');
    if ((ops & SelectionKey.OP_READ) > 0) {
        buffer.append('r');
    }//from  ww  w . java  2  s. c  om
    if ((ops & SelectionKey.OP_WRITE) > 0) {
        buffer.append('w');
    }
    if ((ops & SelectionKey.OP_ACCEPT) > 0) {
        buffer.append('a');
    }
    if ((ops & SelectionKey.OP_CONNECT) > 0) {
        buffer.append('c');
    }
    buffer.append(']');
    return buffer.toString();
}

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