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.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.DatagramChannel;
import java.util.Date;

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

public class Server_Time extends Thread implements Server {
    protected boolean run = true;
    private int port = 37;
    private NodeProxyTCP proxy;
    private DatagramChannel channel;

    public Server_Time(NodeProxyTCP proxy, boolean asyn) {
        this.proxy = proxy;
        if (init() && asyn) {
            start();
        }
    }

    public Server_Time(boolean asyn) {
        if (init() && asyn) {
            start();
        }
    }

    public boolean close() {
        this.run = false;
        if (channel != null) {
            try {
                channel.close();
            } catch (IOException e) {
            }
            channel = null;
        }
        return true;
    }

    @Override
    public boolean isRun() {
        return run;
    }

    @Override
    public void run() {
        runServer();
    }

    public void runServer() {
        Thread.currentThread().setName(this.port + " time server");
        ByteBuffer in = ByteBuffer.allocate(8192);
        ByteBuffer out = ByteBuffer.allocate(8);
        out.order(ByteOrder.BIG_ENDIAN);

        while (isInterrupted() == false && this.run) {
            try {
                in.clear();
                SocketAddress client = channel.receive(in);
                out.clear();
                long secondsSince1900 = getTime();
                out.putLong(secondsSince1900);
                out.flip();
                /* skip over the first four bytes to make this an unsigned int */
                out.position(4);
                channel.send(out, client);
            } catch (IOException e) {

            }
        }
    }

    public Server_Time withPort(int value) {
        this.port = value;
        return this;
    }

    private boolean init() {
        boolean success = true;
        try {
            if (proxy != null && NodeProxy.isInput(proxy.getType())) {
                this.port = proxy.getPort();
            }
            SocketAddress address = new InetSocketAddress(this.port);
            channel = DatagramChannel.open();
            DatagramSocket socket = channel.socket();
            socket.bind(address);
        } catch (SocketException e) {
            success = false;
        } catch (IOException e) {
            success = false;
        }
        return success;
    }

    private static long getTime() {
        long differenceBetweenEpochs = 2208988800L;
        Date now = new Date();
        long secondsSince1970 = now.getTime() / 1000;
        long secondsSince1900 = secondsSince1970 + differenceBetweenEpochs;
        return secondsSince1900;
    }
}