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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 java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.event.EventListenerList;
public final class Discovery implements Runnable {
//private InetAddress pMyAddress;
private final int pPortTX = 1001; // port d'emission
private final int pPortRX = 1002; // port de reception
private DatagramSocket pSocket = null;
private DatagramPacket packetRx = null;
private byte[] bufferRx = new byte[1500];
private volatile boolean stopThread = false; // mettre volatile pour le multi-threading
private boolean threadIsActive = false;
// constructeur
public Discovery(String ipAddress) throws UnknownHostException, SocketException, IOException{
super();
openDiscoverySocket(ipAddress);
System.out.println("Discovery has initialized");
}
public void openDiscoverySocket(String ipAddress) throws UnknownHostException, SocketException, IOException{
threadIsActive = false;
if (pSocket != null){
System.out.println("discoverySocket.close");
pSocket.close();
}
System.out.println("discoverySocket.open");
pSocket = new DatagramSocket(pPortRX, InetAddress.getByName(ipAddress));
packetRx = new DatagramPacket(bufferRx, bufferRx.length);
threadIsActive = true;
}
// envoie le message
public void sendDiscoveryMsg() throws UnknownHostException, IOException{
System.out.println("sendDiscoveryMsg : message envoyé");
byte[] buffer = "who is here ?".getBytes();
InetAddress destAddress;
DatagramPacket packet;
destAddress = InetAddress.getByName("255.255.255.255"); // envoie broadcast des données
packet = new DatagramPacket(buffer, buffer.length, destAddress, pPortTX);
packet.setData(buffer);
pSocket.send(packet);
}
// reception des data
// lance le thread
@Override
public void run(){
boolean threadOff = false; // pour arreter le thread
System.out.println("thread Discovery : start");
System.out.println("thread Discovery : has initialized");
while(!threadOff){
if(threadIsActive == true){
try {
pSocket.receive(packetRx);
} catch (IOException ex) {
Logger.getLogger(Discovery.class.getName()).log(Level.SEVERE, null, ex);
}
// affichage des données reçues
String myStr = new String(packetRx.getData(), 0, packetRx.getLength());
String[] myStr2 = myStr.split("\r\n");
sendMessage(myStr2, packetRx.getAddress().toString().replace("/", ""));
}
synchronized(this) {
Thread.yield();
// lecture du boolean
threadOff = this.stopThread;
}
}
pSocket.close();
System.out.println("Discovery : isClosed");
}
// ferme le thread
public void close(){
this.stopThread = true;
pSocket.close(); // fait lever une exception sur pSocket (s'il est en cours d'utilisation) pour pouvoir arreter le thread de reception
System.out.println("Discovery : close");
}
// ***********************************************************************
// Gestion des messages console (implementation de l'interface StatusListener que j'ai créée)
private final static EventListenerList listeners = new EventListenerList();
// gestion de l'ajout d'un ecouteur a liste listeners
// => on peut ajouter plusieurs type de listener dans la liste (on repere leur type grace a StatusListener.class)
public void addStatusListener(StatusListener listener){
listeners.add(StatusListener.class, listener);
}
// suppression d'un listener dans la liste
public void removeStatusListener(StatusListener listener){
listeners.remove(StatusListener.class, listener);
}
// recupere la liste de tous les abonnés
public StatusListener[] getStatusListener(){
return listeners.getListeners(StatusListener.class);
}
// envoie de l'evenement
//protected void sendMessage(String message, short type){
protected void sendMessage(String[] messages, String iPaddress){
String[] msg = new String[4];
System.out.print("DiscoveryMsg : send => " );
for(int i = 0; i<messages.length; i++){
if (i !=0){
System.out.print(" / ");
}
System.out.print(messages[i]);
}
System.out.println(); // fin de la ligne
if (messages.length == 3){
// mise en forme
msg[3] = messages[2];
msg[2] = messages[0];
msg[1] = messages[1];
msg[0] = iPaddress;
for(StatusListener listener : getStatusListener()) {
listener.infoMessageDetected(msg, (short) 0);
}
}
}
} |
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