com.github.herong.rpc.netty.protobuf.demo3.Demo3ProtobufServerHandler.java Source code

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Here is the source code for com.github.herong.rpc.netty.protobuf.demo3.Demo3ProtobufServerHandler.java

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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 com.github.herong.rpc.netty.protobuf.demo3;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.github.herong.rpc.netty.protobuf.demo3.Commands.Command;
import com.github.herong.rpc.netty.protobuf.demo3.Request.Heartbeat;
import com.github.herong.rpc.netty.protobuf.demo3.Request.LoginRequest;
import com.google.common.base.CaseFormat;
import com.google.protobuf.GeneratedMessage;

/**
 * Handler implementation for the echo server.
 */
@Sharable
public class Demo3ProtobufServerHandler extends ChannelInboundHandlerAdapter {

    private static final Logger logger = LoggerFactory.getLogger(Demo3ProtobufServerHandler.class);

    private Channel channel;

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("--------------channelActive-------------");
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        System.out.println("---------------------------");
        Commands.Command decoded = (Commands.Command) msg;
        logger.info("receive protobuf decoded message {}" + decoded);
        this.channel = ctx.channel();
        invokeHandle(decoded);
    }

    public void channelRead(ChannelHandlerContext ctx, Commands.Command decoded) throws Exception {

    }

    private void invokeHandle(Commands.Command decoded) throws Exception {
        Command.CommandType com = decoded.getType();
        String methodName = "handle" + CaseFormat.UPPER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, com.name());

        for (Method method : getClass().getDeclaredMethods()) {
            if (method.getName().equalsIgnoreCase(methodName)) {
                method.setAccessible(true);
                Class[] types = method.getParameterTypes();
                Class cmdType = types[0];
                Field f = cmdType.getField("cmd");
                GeneratedMessage.GeneratedExtension ext = (GeneratedMessage.GeneratedExtension) f.get(decoded);

                method.invoke(this, decoded.getExtension(ext));
                break;
            }
        }
    }

    private void handleLoginReq(LoginRequest login) {
        logger.info("channel {} invoke handleLoginReq : {}", channel, login);
        channel.writeAndFlush(CommandBuilder.buildLoginResponse(0, "success"));
    }

    private void handleHeartbeat(Heartbeat hb) {
        logger.info("channel {} invoke heartbeat {} ", channel, hb);

    }

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

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Close the connection when an exception is raised.
        logger.error("Unexpected exception from downstream.", cause);
        ctx.close();
    }
}