com.alibaba.dubbo.remoting.transport.netty4.NettyHandler.java Source code

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Here is the source code for com.alibaba.dubbo.remoting.transport.netty4.NettyHandler.java

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/*
 * Copyright 1999-2011 Alibaba Group.
 *  
 * Licensed 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 com.alibaba.dubbo.remoting.transport.netty4;

import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.utils.NetUtils;
import com.alibaba.dubbo.remoting.Channel;
import com.alibaba.dubbo.remoting.ChannelHandler;
import io.netty.channel.*;

import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * NettyHandler
 * 
 * @author william.liangf
 * @author wuwen
 */
@io.netty.channel.ChannelHandler.Sharable
public class NettyHandler extends ChannelHandlerAdapter implements ChannelOutboundHandler, ChannelInboundHandler {

    private final Map<String, Channel> channels = new ConcurrentHashMap<String, Channel>(); // <ip:port, channel>

    private final URL url;

    private final ChannelHandler handler;

    public NettyHandler(URL url, ChannelHandler handler) {
        if (url == null) {
            throw new IllegalArgumentException("url == null");
        }
        if (handler == null) {
            throw new IllegalArgumentException("handler == null");
        }
        this.url = url;
        this.handler = handler;
    }

    public Map<String, Channel> getChannels() {
        return channels;
    }

    @Override
    public void bind(ChannelHandlerContext ctx, SocketAddress socketAddress, ChannelPromise channelPromise)
            throws Exception {
        ctx.bind(socketAddress, channelPromise);
    }

    /**
     * Called once a connect operation is made.
     *
     * @param ctx           the {@link io.netty.channel.ChannelHandlerContext} for which the connect operation is made
     * @param remoteAddress the {@link java.net.SocketAddress} to which it should connect
     * @param localAddress  the {@link java.net.SocketAddress} which is used as source on connect
     * @param promise       the {@link io.netty.channel.ChannelPromise} to notify once the operation completes
     * @throws Exception thrown if an error accour
     */
    @Override
    public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress,
            ChannelPromise promise) throws Exception {
        ctx.connect(remoteAddress, localAddress, promise);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {

        NettyChannel channel = NettyChannel.getOrAddChannel(ctx.channel(), url, handler);
        try {
            if (channel != null) {
                channels.put(NetUtils.toAddressString((InetSocketAddress) ctx.channel().remoteAddress()), channel);
            }
            handler.connected(channel);
        } finally {
            NettyChannel.removeChannelIfDisconnected(ctx.channel());
        }
    }

    @Override
    public void disconnect(io.netty.channel.ChannelHandlerContext ctx,
            io.netty.channel.ChannelPromise channelPromise) throws java.lang.Exception {
        ctx.disconnect(channelPromise);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {

        NettyChannel channel = NettyChannel.getOrAddChannel(ctx.channel(), url, handler);
        try {
            channels.remove(NetUtils.toAddressString((InetSocketAddress) ctx.channel().remoteAddress()));
            handler.disconnected(channel);
        } finally {
            NettyChannel.removeChannelIfDisconnected(ctx.channel());
        }
    }

    @Override
    public void channelRead(io.netty.channel.ChannelHandlerContext ctx, Object msg) throws java.lang.Exception {

        @SuppressWarnings("unchecked")
        NettyChannel channel = NettyChannel.getOrAddChannel(ctx.channel(), url, handler);
        try {
            handler.received(channel, msg);
        } finally {
            NettyChannel.removeChannelIfDisconnected(ctx.channel());
        }

    }

    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        ctx.writeAndFlush(msg, promise);
        NettyChannel channel = NettyChannel.getOrAddChannel(ctx.channel(), url, handler);
        try {
            handler.sent(channel, msg);
        } finally {
            NettyChannel.removeChannelIfDisconnected(ctx.channel());
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        NettyChannel channel = NettyChannel.getOrAddChannel(ctx.channel(), url, handler);
        try {
            handler.caught(channel, cause);
        } finally {
            NettyChannel.removeChannelIfDisconnected(ctx.channel());
        }
    }

    @Override
    public void close(ChannelHandlerContext ctx, ChannelPromise channelPromise) throws Exception {
        ctx.close(channelPromise);
    }

    @Override
    public void deregister(ChannelHandlerContext ctx, ChannelPromise channelPromise) throws Exception {
        ctx.deregister(channelPromise);
    }

    @Override
    public void read(ChannelHandlerContext channelHandlerContext) throws Exception {
        channelHandlerContext.read();
    }

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        ctx.fireChannelRegistered();
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        ctx.fireChannelUnregistered();
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.fireChannelReadComplete();
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object o) throws Exception {
        ctx.fireUserEventTriggered(o);
    }

    @Override
    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
        ctx.fireChannelWritabilityChanged();
    }

    @Override
    public void flush(ChannelHandlerContext ctx) throws Exception {
        ctx.flush();
    }

}