ClientServer.java

/*
 * MIT License
 *
 * Copyright (c) 2017 Distributed clocks
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

import org.github.com.jvec.JVec;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveAction;
import java.nio.ByteBuffer;

public class ClientServer {
 private static final int SERVERPORT = 8080;
 private static final int CLIENTPORT = 8081;
 private static final String SERVERIP = "localhost";
 private static final int MESSAGES = 10;
 private static final int MAXBUFLEN = 100;


 static class UDPServer extends RecursiveAction {

 @Override
 protected void compute() {
 try {
 JVec vcInfo = new JVec("server", "serverlogfile");
 DatagramSocket serverSocket = new DatagramSocket(SERVERPORT);
 byte[] receiveData = new byte[MAXBUFLEN];
 InetAddress IPAddress = InetAddress.getByName(SERVERIP);
 int n = 0, nMinOne = 0;

 for (int i = 0; i < MESSAGES; i++) {
 DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
 serverSocket.receive(receivePacket);
 ByteBuffer decodedMsg = ByteBuffer.wrap(vcInfo.unpackReceive("Received message from client.", receivePacket.getData()));
 int decodedInt = decodedMsg.getInt();
 System.out.println("Received message from client: " + decodedInt);
 if (decodedInt == 0) {
 n = 0;
 } else if (decodedInt == 1) {
 nMinOne = 0;
 n = 1;
 } else {
 int nMinTwo = nMinOne;
 nMinOne = n;
 n = nMinOne + nMinTwo;
 }
 ByteBuffer b = ByteBuffer.allocate(Integer.SIZE/Byte.SIZE);
 byte[] inBuf = vcInfo.prepareSend("Responding to client.", b.putInt(n).array());
 System.out.println("Responding to client with value " + n);
 DatagramPacket sendPacket = new DatagramPacket(inBuf, inBuf.length, IPAddress, CLIENTPORT);
 serverSocket.send(sendPacket);
 }
 serverSocket.close();
 // We are done. Flush the buffered results to our logfile and close the reader.
 vcInfo.closeJVectorLog();
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 }

 static class UDPClient extends RecursiveAction {

 @Override
 protected void compute() {

 try {
 JVec vcInfo = new JVec("client", "clientlogfile");
 DatagramSocket clientSocket = new DatagramSocket(CLIENTPORT);
 byte[] receiveData = new byte[MAXBUFLEN];
 InetAddress IPAddress = InetAddress.getByName(SERVERIP);
 for (int i = 0; i < MESSAGES; i++) {
 ByteBuffer b = ByteBuffer.allocate(Integer.SIZE/Byte.SIZE);
 byte[] inBuf = vcInfo.prepareSend("Sending message to server.", b.putInt(i).array());
 System.out.println("Sending message to server.");
 DatagramPacket sendPacket = new DatagramPacket(inBuf, inBuf.length, IPAddress, SERVERPORT);
 clientSocket.send(sendPacket);
 DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
 clientSocket.receive(receivePacket);
 ByteBuffer decodedMsg = ByteBuffer.wrap(vcInfo.unpackReceive("Received message from server.", receivePacket.getData()));
 int decodedInt = decodedMsg.getInt();
 System.out.println("Received value " + decodedInt + " from server.");
 }
 clientSocket.close();
 // We are done. Flush the buffered results to our logfile and close the reader.
 vcInfo.closeJVectorLog();
 } catch (Exception e) {
 System.out.println("Something went wrong.");
 e.printStackTrace();
 }
 }
 }

 public static void main(String args[]) throws InterruptedException {
 UDPServer server = new UDPServer();
 UDPClient client = new UDPClient();
 ForkJoinPool forkJoinPool = new ForkJoinPool(2);
 forkJoinPool.execute(server);
 Thread.sleep(1000);
 forkJoinPool.invoke(client);
 }
}