fujaba/NetworkParser

package de.uniks.networkparser.ext.petaf;

/*
The MIT License

Copyright (c) 2010-2016 Stefan Lindel https://www.github.com/fujaba/NetworkParser/

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 java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;

import de.uniks.networkparser.ext.petaf.proxy.NodeProxyTCP;
import de.uniks.networkparser.interfaces.Entity;
import de.uniks.networkparser.interfaces.Server;

public class Server_UPD extends Thread implements Server {
    protected boolean run = true;
    protected DatagramSocket socket;
    private NodeProxyTCP proxy;

    public Server_UPD(NodeProxyTCP proxy, boolean asyn) {
        this.proxy = proxy;
        if (init()) {
            if (asyn) {
                start();
            }
        } else {
            run = false;
        }
    }

    public boolean close() {
        this.run = false;
        if (socket != null) {
            socket.close();
            socket = null;
        }
        return true;
    }

    @Override
    public boolean isRun() {
        return socket != null && socket.isClosed() == false;
    }

    @Override
    public void run() {
        if (NodeProxy.isInput(proxy.getType())) {
            runServer();
        } else {
            DatagramPacket data = runClient();
            if (proxy != null) {
                proxy.getSpace().firePropertyChange(BROADCAST, null, data);
            }
        }
    }

    public DatagramPacket createSendPacket(int port) {
        byte[] sendData = new byte[proxy.getBufferSize()];
        if (proxy.getSpace() != null) {
            sendData = proxy.getSpace().getReplicationInfo().toString().getBytes();
        }
        InetAddress IPAddress = null;
        try {
            IPAddress = InetAddress.getByName("localhost");
        } catch (UnknownHostException e) {
        }
        DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);
        return sendPacket;
    }

    public DatagramPacket runClient() {
        DatagramPacket message = createSendPacket(proxy.getReceivePort());
        DatagramPacket receivePacket;
        try {
            if (socket == null) {

            }
            socket.send(message);

            byte[] receiveData = new byte[proxy.getBufferSize()];
            receivePacket = new DatagramPacket(receiveData, receiveData.length);
            socket.receive(receivePacket);
        } catch (IOException e) {
            return null;
        }
        return receivePacket;
    }

    public void runServer() {
        Thread.currentThread().setName(proxy.getPort() + " broadcast server");
        while (isInterrupted() == false && this.run) {
            try {
                byte[] receiveData = new byte[proxy.getBufferSize()];
                DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
                socket.receive(receivePacket);

                InetAddress IPAddress = receivePacket.getAddress();
                int port = receivePacket.getPort();
                Entity answer = proxy.getSpace().getReplicationInfo();
                byte[] sendData = answer.toString().getBytes();
                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);
                socket.send(sendPacket);
            } catch (IOException e) {

            }
        }
    }

    private boolean init() {
        boolean success = true;
        try {
            /* Switch for Client / Server */
            if (proxy != null && NodeProxy.isInput(proxy.getType())) {
                int port = this.proxy.getPort();
                try {
                    socket = new DatagramSocket(port);
                } catch (Exception e) {
                    socket = new DatagramSocket();
                    this.proxy.withPort(socket.getLocalPort());
                    this.proxy.withReceivePort(port);
                }
            } else {
                socket = new DatagramSocket();
            }
        } catch (SocketException e) {
            success = false;
        }
        return success;
    }
}