com.demo.netty.echo.EchoServerHandler.java Source code

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Here is the source code for com.demo.netty.echo.EchoServerHandler.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.demo.netty.echo;

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

/**
 * Handler implementation for the echo server.
 */
@Sharable // Indicate that a ChannelHandler can be safely shared by multiple channels
public class EchoServerHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        // Invoked when a Channel is registered to its EventLoop and able to handle IO
        super.channelRegistered(ctx);
        System.err.println("channel registered:" + ctx.channel().toString());
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        super.channelUnregistered(ctx);
        System.err.println("channel unregistered:" + ctx.channel().toString());
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        super.channelActive(ctx);
        // Invoked when a Channel is active, the Channel is connected/bound and ready
        System.err.println("channel active:" + ctx.channel().toString());
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        // Invoked when a Channel leaves active state is no longer connected to its remote peer
        super.channelInactive(ctx);
        System.err.println("channel inactive:" + ctx.channel().toString());
    }

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

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

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Close the connection when an exception is raised.
        cause.printStackTrace();
        ctx.close();
    }
}