Netty.BeaconServerHandler.java Source code

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Here is the source code for Netty.BeaconServerHandler.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 io.netty.example.beacon;

package Netty;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import java.net.InetAddress;
import java.util.Date;
import java.io.*;

/**
 * Handles a server-side channel.
 */
@Sharable
public class BeaconServerHandler extends SimpleChannelInboundHandler<String> {

    private boolean stop = false;
    private File readFile;

    public BeaconServerHandler(File f) {
        super();
        readFile = f;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        // Send greeting for a new connection.
        // ctx.write("Welcome to " + InetAddress.getLocalHost().getHostName() + "!\r\n");

        FileReader reader;
        BufferedReader br;
        String send = "";

        do {
            try {

                while (!readFile.exists()) {
                    //wait
                    Thread.sleep(100);
                }
                reader = new FileReader(readFile);
                br = new BufferedReader(reader);
                send = "";

                String s;
                while ((s = br.readLine()) != null)
                    send += s + '\n';
                reader.close();

                readFile.delete();

                //System.out.println(send);

            } catch (Exception ex) {
                System.out.println(ex);
            }

            ctx.write(send + '\n');
            //Thread.sleep(1000);
            ctx.flush();
        } while (!stop);
        /*
        ctx.write("It is " + new Date() + " now.\r\n");
        Thread.sleep(3000); ctx.flush();
        ctx.write("It is " + new Date() + " now.\r\n");
        Thread.sleep(3000); ctx.flush();
        ctx.write("It is " + new Date() + " now.\r\n");
        Thread.sleep(3000); ctx.flush();
        ctx.write("It is " + new Date() + " now.\r\n");
        */
        ctx.flush();
    }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, String request) throws Exception {
        // Generate and write a response.
        String response;
        boolean close = false;
        if (request.isEmpty()) {
            response = "Please type something.\r\n";
        } else if ("bye".equals(request.toLowerCase())) {
            response = "Have a good day!\r\n";
            close = true;
            stop = true;
        } else {
            response = "Did you say '" + request + "'?\r\n";
        }

        // We do not need to write a ChannelBuffer here.
        // We know the encoder inserted at BeaconPipelineFactory will do the conversion.
        ChannelFuture future = ctx.write(response);

        // Close the connection after sending 'Have a good day!'
        // if the client has sent 'bye'.
        if (close) {
            future.addListener(ChannelFutureListener.CLOSE);
        }
    }

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

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