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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.
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/*
 * 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.local;

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

import java.nio.channels.ClosedChannelException;
import java.nio.channels.NotYetConnectedException;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;

import org.jboss.netty.channel.AbstractChannel;
import org.jboss.netty.channel.ChannelConfig;
import org.jboss.netty.channel.ChannelException;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelSink;
import org.jboss.netty.channel.DefaultChannelConfig;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.util.internal.ThreadLocalBoolean;

/**
 */
final class DefaultLocalChannel extends AbstractChannel implements LocalChannel {

    // TODO Move the state management up to AbstractChannel to remove duplication.
    private static final int ST_OPEN = 0;
    private static final int ST_BOUND = 1;
    private static final int ST_CONNECTED = 2;
    private static final int ST_CLOSED = -1;
    final AtomicInteger state = new AtomicInteger(ST_OPEN);

    private final ChannelConfig config;
    private final ThreadLocalBoolean delivering = new ThreadLocalBoolean();

    final Queue writeBuffer = new ConcurrentLinkedQueue();

    volatile DefaultLocalChannel pairedChannel;
    volatile LocalAddress localAddress;
    volatile LocalAddress remoteAddress;

    DefaultLocalChannel(
            LocalServerChannel parent, ChannelFactory factory, ChannelPipeline pipeline,
            ChannelSink sink, DefaultLocalChannel pairedChannel) {
        super(parent, factory, pipeline, sink);
        this.pairedChannel = pairedChannel;
        config = new DefaultChannelConfig();

        // TODO Move the state variable to AbstractChannel so that we don't need
        //      to add many listeners.
        getCloseFuture().addListener(new ChannelFutureListener() {
            public void operationComplete(ChannelFuture future) throws Exception {
                state.set(ST_CLOSED);
            }
        });

        fireChannelOpen(this);
    }

    public ChannelConfig getConfig() {
        return config;
    }

    @Override
    public boolean isOpen() {
        return state.get() >= ST_OPEN;
    }

    public boolean isBound() {
        return state.get() >= ST_BOUND;
    }

    public boolean isConnected() {
        return state.get() == ST_CONNECTED;
    }

    void setBound() throws ClosedChannelException {
        if (!state.compareAndSet(ST_OPEN, ST_BOUND)) {
            switch (state.get()) {
            case ST_CLOSED:
                throw new ClosedChannelException();
            default:
                throw new ChannelException("already bound");
            }
        }
    }

    void setConnected() {
        if (state.get() != ST_CLOSED) {
            state.set(ST_CONNECTED);
        }
    }

    @Override
    protected boolean setClosed() {
        return super.setClosed();
    }

    public LocalAddress getLocalAddress() {
        return localAddress;
    }

    public LocalAddress getRemoteAddress() {
        return remoteAddress;
    }

    void closeNow(ChannelFuture future) {
        LocalAddress localAddress = this.localAddress;
        try {
            // Close the self.
            if (!setClosed()) {
                return;
            }

            DefaultLocalChannel pairedChannel = this.pairedChannel;
            if (pairedChannel != null) {
                this.pairedChannel = null;
                fireChannelDisconnected(this);
                fireChannelUnbound(this);
            }
            fireChannelClosed(this);

            // Close the peer.
            if (pairedChannel == null || !pairedChannel.setClosed()) {
                return;
            }

            DefaultLocalChannel me = pairedChannel.pairedChannel;
            if (me != null) {
                pairedChannel.pairedChannel = null;
                fireChannelDisconnected(pairedChannel);
                fireChannelUnbound(pairedChannel);
            }
            fireChannelClosed(pairedChannel);
        } finally {
            future.setSuccess();
            if (localAddress != null && getParent() == null) {
                LocalChannelRegistry.unregister(localAddress);
            }
        }
    }

    void flushWriteBuffer() {
        DefaultLocalChannel pairedChannel = this.pairedChannel;
        if (pairedChannel != null) {
            if (pairedChannel.isConnected()) {
                // Channel is open and connected and channelConnected event has
                // been fired.
                if (!delivering.get()) {
                    delivering.set(true);
                    try {
                        for (;;) {
                            MessageEvent e = writeBuffer.poll();
                            if (e == null) {
                                break;
                            }

                            fireMessageReceived(pairedChannel, e.getMessage());
                            e.getFuture().setSuccess();
                            fireWriteComplete(this, 1);
                        }
                    } finally {
                        delivering.set(false);
                    }
                }
            } else {
                // Channel is open and connected but channelConnected event has
                // not been fired yet.
            }
        } else {
            // Channel is closed or not connected yet - notify as failures.
            Exception cause;
            if (isOpen()) {
                cause = new NotYetConnectedException();
            } else {
                cause = new ClosedChannelException();
            }

            for (;;) {
                MessageEvent e = writeBuffer.poll();
                if (e == null) {
                    break;
                }

                e.getFuture().setFailure(cause);
                fireExceptionCaught(this, cause);
            }
        }
    }
}