com.github.nettybook.ch3.EchoClientHandler.java Source code

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Here is the source code for com.github.nettybook.ch3.EchoClientHandler.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.nettybook.ch3;

import java.nio.charset.Charset;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

/**
 * Handler implementation for the echo client. It initiates the ping-pong
 * traffic between the echo client and server by sending the first message to
 * the server.
 */
public class EchoClientHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        String sendMessage = "Hello netty";

        ByteBuf messageBuffer = Unpooled.buffer();
        messageBuffer.writeBytes(sendMessage.getBytes());

        StringBuilder builder = new StringBuilder();
        builder.append(" ? [");
        builder.append(sendMessage);
        builder.append("]");

        System.out.println(builder.toString());
        ctx.writeAndFlush(messageBuffer);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        String readMessage = ((ByteBuf) msg).toString(Charset.defaultCharset());

        StringBuilder builder = new StringBuilder();
        builder.append(" ? [");
        builder.append(readMessage);
        builder.append("]");

        System.out.println(builder.toString());
    }

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

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }
}