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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.socket.nio;

import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelSink;

import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.channels.SocketChannel;

public class NioSocketChannel extends AbstractNioChannel
                                implements org.jboss.netty.channel.socket.SocketChannel {

    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;
    @SuppressWarnings("RedundantFieldInitialization")
    volatile int state = ST_OPEN;

    private final NioSocketChannelConfig config;

    public NioSocketChannel(
            Channel parent, ChannelFactory factory,
            ChannelPipeline pipeline, ChannelSink sink,
            SocketChannel socket, NioWorker worker) {
        super(parent, factory, pipeline, sink, worker, socket);
        config = new DefaultNioSocketChannelConfig(socket.socket());
    }

    @Override
    public NioWorker getWorker() {
        return (NioWorker) super.getWorker();
    }

    @Override
    public NioSocketChannelConfig getConfig() {
        return config;
    }

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

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

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

    final void setBound() {
        assert state == ST_OPEN : "Invalid state: " + state;
        state = ST_BOUND;
    }

    final void setConnected() {
        if (state != ST_CLOSED) {
            state = ST_CONNECTED;
        }
    }

    @Override
    protected boolean setClosed() {
        if (super.setClosed()) {
            state = ST_CLOSED;
            return true;
        }
        return false;
    }

    @Override
    InetSocketAddress getLocalSocketAddress() throws Exception {
        return (InetSocketAddress) channel.socket().getLocalSocketAddress();
    }

    @Override
    InetSocketAddress getRemoteSocketAddress() throws Exception {
        return (InetSocketAddress) channel.socket().getRemoteSocketAddress();
    }

    @Override
    public ChannelFuture write(Object message, SocketAddress remoteAddress) {
        if (remoteAddress == null || remoteAddress.equals(getRemoteAddress())) {
            return super.write(message, null);
        } else {
            return getUnsupportedOperationFuture();
        }
    }
}