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

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Here is the source code for com.alibaba.dubbo.remoting.transport.netty4.NettyClientHandler.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.remoting.ChannelHandler;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;

/**
 * NettyClientHandler
 *
 * @author william.liangf
 * @author qinliujie
 */
@io.netty.channel.ChannelHandler.Sharable
public class NettyClientHandler extends ChannelDuplexHandler {

    private final URL url;

    private final ChannelHandler handler;

    public NettyClientHandler(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;
    }

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

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

    @Override
    public void disconnect(ChannelHandlerContext ctx, ChannelPromise future) throws Exception {
        NettyChannel channel = NettyChannel.getOrAddChannel(ctx.channel(), url, handler);
        try {
            handler.disconnected(channel);
        } finally {
            NettyChannel.removeChannelIfDisconnected(ctx.channel());
        }
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        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 {
        super.write(ctx, 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());
        }
    }
}