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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 org.jboss.netty.channel.AbstractChannelSink;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelException;
import org.jboss.netty.channel.ChannelFuture;
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.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;

import java.io.IOException;
import java.net.ConnectException;

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

/**
 */
final class LocalClientChannelSink extends AbstractChannelSink {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(LocalClientChannelSink.class);

    public void eventSunk(ChannelPipeline pipeline, ChannelEvent e) throws Exception {
        if (e instanceof ChannelStateEvent) {
            ChannelStateEvent event = (ChannelStateEvent) e;

            DefaultLocalChannel channel =
                  (DefaultLocalChannel) event.getChannel();
            ChannelFuture future = event.getFuture();
            ChannelState state = event.getState();
            Object value = event.getValue();
            switch (state) {
            case OPEN:
                if (Boolean.FALSE.equals(value)) {
                    channel.closeNow(future);
                }
                break;
            case BOUND:
                if (value != null) {
                    bind(channel, future, (LocalAddress) value);
                } else {
                    channel.closeNow(future);
                }
                break;
            case CONNECTED:
                if (value != null) {
                    connect(channel, future, (LocalAddress) value);
                } else {
                    channel.closeNow(future);
                }
                break;
            case INTEREST_OPS:
                // Unsupported - discard silently.
                future.setSuccess();
                break;
            }
        } else if (e instanceof MessageEvent) {
            MessageEvent event = (MessageEvent) e;
            DefaultLocalChannel channel = (DefaultLocalChannel) event.getChannel();
            boolean offered = channel.writeBuffer.offer(event);
            assert offered;
            channel.flushWriteBuffer();
        }
    }

    private static void bind(DefaultLocalChannel channel, ChannelFuture future, LocalAddress localAddress) {
        try {
            if (!LocalChannelRegistry.register(localAddress, channel)) {
                throw new ChannelException("address already in use: " + localAddress);
            }

            channel.setBound();
            channel.localAddress = localAddress;
            future.setSuccess();
            fireChannelBound(channel, localAddress);
        } catch (Throwable t) {
            LocalChannelRegistry.unregister(localAddress);
            future.setFailure(t);
            fireExceptionCaught(channel, t);
        }
    }

    private void connect(DefaultLocalChannel channel, ChannelFuture future, LocalAddress remoteAddress) {
        Channel remoteChannel = LocalChannelRegistry.getChannel(remoteAddress);
        if (!(remoteChannel instanceof DefaultLocalServerChannel)) {
            future.setFailure(new ConnectException(
                    "connection refused: " + remoteAddress));
            return;
        }

        DefaultLocalServerChannel serverChannel = (DefaultLocalServerChannel) remoteChannel;
        ChannelPipeline pipeline;
        try {
            pipeline = serverChannel.getConfig().getPipelineFactory().getPipeline();
        } catch (Exception e) {
            future.setFailure(e);
            fireExceptionCaught(channel, e);
            if (logger.isWarnEnabled()) {
                logger.warn(
                        "Failed to initialize an accepted socket.", e);
            }
            return;
        }

        future.setSuccess();
        DefaultLocalChannel acceptedChannel = new DefaultLocalChannel(
                serverChannel, serverChannel.getFactory(), pipeline, this, channel);
        channel.pairedChannel = acceptedChannel;

        // check if the channel was bound before. See #276
        if (!channel.isBound()) {
            bind(channel, succeededFuture(channel), new LocalAddress(LocalAddress.EPHEMERAL));
        }
        channel.remoteAddress = serverChannel.getLocalAddress();
        channel.setConnected();
        fireChannelConnected(channel, serverChannel.getLocalAddress());

        acceptedChannel.localAddress = serverChannel.getLocalAddress();
        try {
            acceptedChannel.setBound();
        } catch (IOException e) {
            throw new Error(e);
        }
        fireChannelBound(acceptedChannel, channel.getRemoteAddress());
        acceptedChannel.remoteAddress = channel.getLocalAddress();
        acceptedChannel.setConnected();
        fireChannelConnected(acceptedChannel, channel.getLocalAddress());

        // Flush something that was written in channelBound / channelConnected
        channel.flushWriteBuffer();
        acceptedChannel.flushWriteBuffer();
    }
}