network.UDPServer.java Source code

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Here is the source code for network.UDPServer.java

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/*******************************************************************************
 * Copyright Yifan Ruan
 *
 * Licensed 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 network;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import network.protocol.Message;

import org.apache.commons.lang3.SerializationUtils;

/**
 * 
 * @author Yifan Ruan (ry222ad@student.lnu.se)
 */
public class UDPServer implements Runnable {
    int port;
    DatagramSocket socket;
    ServerHandler serverHandler;

    ExecutorService executorService;

    boolean isStopped = false;
    private final int MAX_PACKET_SIZE = 32000;

    public UDPServer(int port, ServerHandler serverHandle) {
        this.port = port;
        this.serverHandler = serverHandle;
        try {
            this.socket = new DatagramSocket(this.port);
            //this.executorService = Executors.newFixedThreadPool(50);
            this.executorService = Executors.newCachedThreadPool();
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        try {
            while (!isStopped()) {
                byte[] receiveData = new byte[MAX_PACKET_SIZE];
                final DatagramPacket receivedPacket = new DatagramPacket(receiveData, receiveData.length);
                socket.receive(receivedPacket);

                final UDPServer server = this;
                //System.out.println("Message received!");
                executorService.execute(new Runnable() {
                    public void run() {
                        try {
                            serverHandler.handle(server, receivedPacket);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                });
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void sendMessage(Message message, InetAddress remoteAddress, int remotePort) {

        byte tempBuffer[] = SerializationUtils.serialize(message);
        final DatagramPacket sendPacket = new DatagramPacket(tempBuffer, tempBuffer.length, remoteAddress,
                remotePort);

        executorService.execute(new Runnable() {
            public void run() {
                try {
                    //System.out.println("Send UDP message!");
                    socket.send(sendPacket);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    private synchronized boolean isStopped() {
        return this.isStopped;
    }

    public synchronized void stop() {
        this.isStopped = true;
        this.socket.close();
        this.executorService.shutdown();
    }
}