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Java example source code file (ByteEchoClientHandler.java)

This example Java source code file (ByteEchoClientHandler.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytebuf, byteechoclienthandler, channelhandlercontext, override, simplechannelinboundhandler, throwable

The ByteEchoClientHandler.java Java example source code

/*
 * 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 io.netty.example.udt.echo.bytes;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.udt.nio.NioUdtProvider;

/**
 * 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 on activation.
 */
public class ByteEchoClientHandler extends SimpleChannelInboundHandler<ByteBuf> {

    private final ByteBuf message;

    public ByteEchoClientHandler() {
        super(false);

        message = Unpooled.buffer(ByteEchoClient.SIZE);
        for (int i = 0; i < message.capacity(); i++) {
            message.writeByte((byte) i);
        }
    }

    @Override
    public void channelActive(final ChannelHandlerContext ctx) {
        System.err.println("ECHO active " + NioUdtProvider.socketUDT(ctx.channel()).toStringOptions());
        ctx.writeAndFlush(message);
    }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) {
        ctx.write(msg);
    }

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

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

}

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