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mojays |
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package appl.parallel.server; |
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import java.io.IOException; |
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import java.net.DatagramPacket; |
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import java.net.InetAddress; |
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import java.net.MulticastSocket; |
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import java.net.SocketException; |
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import org.apache.log4j.LogManager; |
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import org.apache.log4j.Logger; |
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import appl.ext.XuluConfig; |
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import appl.parallel.services.MulticastDiscoveryService; |
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/** |
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* Waits for multicast messages from clients and responds properly. |
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* |
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* @see MulticastDiscoveryService |
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* @author Dominik Appl |
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*/ |
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public class ServerMulticastReceiver extends Thread { |
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private final Logger LOG = LogManager.getLogger(this.getClass().getName()); |
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private static final String helloFromXuluMessage = "Hello Servers"; |
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private static final String helloFromServerMessage = "Hello Xulu from XuluServer"; |
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boolean exit = false; |
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MulticastSocket socket; |
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int multicastPort = XuluConfig.getXuluConfig().getIntProperty( |
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"XuluServer.multicastport"); |
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/** |
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* @param socket |
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* Socket which is used for listening. Set a timeout for the |
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* socket via {@link MulticastSocket#setSoTimeout(int)} so that |
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* the thread can be stopped (because of the blocked reading) |
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*/ |
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public ServerMulticastReceiver(MulticastSocket socket) { |
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this.socket = socket; |
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// try { |
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// socket.setSoTimeout(5000); |
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// } catch (SocketException e) { |
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// //do not printout the timeout |
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// } |
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} |
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/** |
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* Safe method to stop the Thread. Use this method instead of {@link Thread} |
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*/ |
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public void stopThread() { |
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exit = true; |
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} |
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public void run() { |
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System.out.println("Listening on port " + socket.getLocalPort() |
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+ " for Xulu hello messages!"); |
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while (!exit) { |
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try { |
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// receive buffer |
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byte[] buffer = new byte[256]; |
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DatagramPacket datagram = new DatagramPacket(buffer, |
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buffer.length); |
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socket.receive(datagram); |
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// get right message format (cut out null bytes) |
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byte[] result = new byte[datagram.getLength()]; |
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System.arraycopy(datagram.getData(), 0, result, 0, datagram |
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.getLength()); |
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// check message: |
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if (new String(result).equals(helloFromXuluMessage)) { |
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// LOG.info("received hello from Client " + |
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// datagram.getAddress()); |
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LOG.info("received hello from Client " |
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+ datagram.getAddress()); |
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// get the IP again and send the answer |
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String IP = XuluConfig.getXuluConfig().getProperty( |
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"XuluServer.multicastgroup"); |
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DatagramPacket answer = new DatagramPacket( |
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helloFromServerMessage.getBytes(), |
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helloFromServerMessage.length(), InetAddress |
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.getByName(IP), multicastPort); |
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socket.send(answer); |
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} |
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} catch (IOException e) { |
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// TODO Auto-generated catch block |
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e.printStackTrace(); |
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} catch (Exception e) { |
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if (!(e instanceof InterruptedException)) |
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e.printStackTrace(); |
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} |
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} |
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} |
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} |
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