org.jboss.netty.channel.socket.oio.OioDatagramPipelineSink Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of netty Show documentation

The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

There is a newer version: 4.0.0.Alpha8

Show newest version

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package org.jboss.netty.channel.socket.oio;

import static org.jboss.netty.channel.Channels.*;

import java.net.SocketAddress;
import java.util.concurrent.Executor;

import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelState;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.util.ThreadNameDeterminer;
import org.jboss.netty.util.ThreadRenamingRunnable;
import org.jboss.netty.util.internal.DeadLockProofWorker;

class OioDatagramPipelineSink extends AbstractOioChannelSink {

    private final Executor workerExecutor;
    private final ThreadNameDeterminer determiner;

    OioDatagramPipelineSink(Executor workerExecutor, ThreadNameDeterminer determiner) {
        this.workerExecutor = workerExecutor;
        this.determiner = determiner;
    }

    public void eventSunk(
            ChannelPipeline pipeline, ChannelEvent e) throws Exception {
        OioDatagramChannel channel = (OioDatagramChannel) e.getChannel();
        ChannelFuture future = e.getFuture();
        if (e instanceof ChannelStateEvent) {
            ChannelStateEvent stateEvent = (ChannelStateEvent) e;
            ChannelState state = stateEvent.getState();
            Object value = stateEvent.getValue();
            switch (state) {
            case OPEN:
                if (Boolean.FALSE.equals(value)) {
                    AbstractOioWorker.close(channel, future);
                }
                break;
            case BOUND:
                if (value != null) {
                    bind(channel, future, (SocketAddress) value);
                } else {
                    AbstractOioWorker.close(channel, future);
                }
                break;
            case CONNECTED:
                if (value != null) {
                    connect(channel, future, (SocketAddress) value);
                } else {
                    OioDatagramWorker.disconnect(channel, future);
                }
                break;
            case INTEREST_OPS:
                AbstractOioWorker.setInterestOps(channel, future, ((Integer) value).intValue());
                break;
            }
        } else if (e instanceof MessageEvent) {
            MessageEvent evt = (MessageEvent) e;
            OioDatagramWorker.write(
                    channel, future, evt.getMessage(), evt.getRemoteAddress());
        }
    }

    private void bind(
            OioDatagramChannel channel, ChannelFuture future,
            SocketAddress localAddress) {
        boolean bound = false;
        boolean workerStarted = false;
        try {
            channel.socket.bind(localAddress);
            bound = true;

            // Fire events
            future.setSuccess();
            fireChannelBound(channel, channel.getLocalAddress());

            // Start the business.
            DeadLockProofWorker.start(
                    workerExecutor,
                    new ThreadRenamingRunnable(
                            new OioDatagramWorker(channel),
                            "Old I/O datagram worker (" + channel + ')',
                            determiner));
            workerStarted = true;
        } catch (Throwable t) {
            future.setFailure(t);
            fireExceptionCaught(channel, t);
        } finally {
            if (bound && !workerStarted) {
                AbstractOioWorker.close(channel, future);
            }
        }
    }

    private void connect(
            OioDatagramChannel channel, ChannelFuture future,
            SocketAddress remoteAddress) {

        boolean bound = channel.isBound();
        boolean connected = false;
        boolean workerStarted = false;

        future.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);

        // Clear the cached address so that the next getRemoteAddress() call
        // updates the cache.
        channel.remoteAddress = null;

        try {
            channel.socket.connect(remoteAddress);
            connected = true;

            // Fire events.
            future.setSuccess();
            if (!bound) {
                fireChannelBound(channel, channel.getLocalAddress());
            }
            fireChannelConnected(channel, channel.getRemoteAddress());

            String threadName = "Old I/O datagram worker (" + channel + ')';
            if (!bound) {
                // Start the business.
                DeadLockProofWorker.start(
                        workerExecutor,
                        new ThreadRenamingRunnable(
                                new OioDatagramWorker(channel), threadName, determiner));
            } else {
                // Worker started by bind() - just rename.
                Thread workerThread = channel.workerThread;
                if (workerThread != null) {
                    try {
                        workerThread.setName(threadName);
                    } catch (SecurityException e) {
                        // Ignore.
                    }
                }
            }

            workerStarted = true;
        } catch (Throwable t) {
            future.setFailure(t);
            fireExceptionCaught(channel, t);
        } finally {
            if (connected && !workerStarted) {
                AbstractOioWorker.close(channel, future);
            }
        }
    }
}