com.caocao.nio.client.EchoClientHandler.java Source code

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Here is the source code for com.caocao.nio.client.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.caocao.nio.client;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.util.CharsetUtil;

import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;

import com.caocao.nio.tools.Msg;

/**
 * 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 SimpleChannelInboundHandler<Msg> {

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, Msg msg) throws Exception {
        // TODO Auto-generated method stub
        System.out.println(":" + msg.toString());

    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        // TODO Auto-generated method stub
        super.userEventTriggered(ctx, evt);
    }

    /**
      * Creates a client-side handler.
      */
    public EchoClientHandler() {
    }

    private String getString(int cmd) {
        StringBuilder sb = new StringBuilder();
        cmd %= 300;
        if (cmd < 0) {
            cmd = -cmd;
        }
        for (int i = 0; i < cmd; i++) {
            sb.append(i);
        }
        return sb.toString();
    }

    @Override
    public void channelActive(final ChannelHandlerContext ctx) {
        final Random random = new Random(0);
        Timer timer = new Timer();

        timer.scheduleAtFixedRate(new TimerTask() {
            byte i = 0;

            @Override
            public void run() {
                // TODO Auto-generated method stub
                Msg m = new Msg();
                m.cmd = i++;
                m.content = getString(random.nextInt());
                ctx.write(m);
            }

        }, 0, 1000);

    }

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