/** listen and respond */
protected void listenFn() {
try {
System.out.println(
"Listening on equipd://"
+ InetAddress.getLocalHost().getHostAddress()
+ ":"
+ socket.getLocalPort());
while (true) {
byte announceData[] = new byte[1024];
DatagramPacket announcepkt = new DatagramPacket(announceData, announceData.length);
try {
// get a packet
socket.receive(announcepkt);
} catch (Exception e) {
System.err.println("ERROR: in DiscoveryRendezvoud receive: " + e + " (give up!)");
return;
}
try {
ByteArrayInputStream bins =
new ByteArrayInputStream(announcepkt.getData(), 0, announcepkt.getLength());
equip.runtime.ObjectInputStream oins = new equip.runtime.ObjectInputStream(bins);
long version = oins.readInt();
if (version != DISCOVERY_VERSION.value) {
System.err.println(
"Warning: DiscoveryRendezvous failed to "
+ "get a valid discovery object "
+ "from "
+ announcepkt.getAddress()
+ "/"
+ announcepkt.getPort()
+ " ("
+ announcepkt.getLength()
+ " bytes), "
+ "version "
+ version
+ " (expecting "
+ DISCOVERY_VERSION.value
+ ")");
continue;
}
Object msg = oins.readObject();
System.out.println("Received a " + msg.getClass().getName());
ServerAnnouncementImpl announcement = null;
DiscoveryRequestImpl request = null;
if (msg instanceof ServerAnnouncementImpl) {
announcement = (ServerAnnouncementImpl) msg;
} else if (msg instanceof DiscoveryRequestImpl) {
request = (DiscoveryRequestImpl) msg;
} else
// don't know what to do with this!
{
continue;
}
synchronized (peers) {
boolean found = false;
Iterator ipeer = peers.iterator();
PeerInfo peer = null;
while (ipeer.hasNext() && !found) {
peer = (PeerInfo) ipeer.next();
if (peer.address.equals(announcepkt.getAddress())
&& peer.port == announcepkt.getPort()) {
found = true;
}
}
if (!found) {
// new
peer =
new PeerInfo(
announcepkt.getAddress(), announcepkt.getPort(), request, announcement);
peers.addElement(peer);
System.out.println("New " + (request != null ? "client" : "server"));
// could do immediate response
// ....
} else {
peer.lastReceiveTime = System.currentTimeMillis();
System.out.println("known");
if (announcement != null) {
peer.announcement = announcement;
}
if (request != null) {
peer.request = request;
}
}
if (announcement != null) {
// send announcement to all matching requests
ipeer = peers.iterator();
while (ipeer.hasNext()) {
peer = (PeerInfo) ipeer.next();
if (peer.request == null) {
continue;
}
boolean matches = false;
int si;
for (si = 0;
!matches && announcement.infos != null && si < announcement.infos.length;
si++) {
// match?
if (DiscoveryServerAgentImpl.matchServiceTypes(
peer.request.serviceTypes, announcement.infos[si].serviceTypes)
&& DiscoveryServerAgentImpl.matchServiceTypes(
peer.request.groups, announcement.infos[si].groups)) {
matches = true;
}
}
// send!
try {
// return to specific address and port - hopefully better for NAT
DatagramPacket p =
new DatagramPacket(
announcepkt.getData(),
announcepkt.getLength(),
peer.address,
((int) peer.port) & 0xffff);
// adjust for overflow error - ianm
socket.send(p);
} catch (Exception e) {
System.err.println(
"ERROR forwarding announcement to "
+ peer.address
+ "/"
+ peer.port
+ ": "
+ e);
}
}
}
}
} catch (Exception e) {
System.err.println(
"Warning: DiscoveryRendezvous failed to "
+ "get a valid discovery object "
+ "from "
+ announcepkt.getAddress()
+ "/"
+ announcepkt.getPort()
+ " ("
+ announcepkt.getLength()
+ " bytes)");
continue;
}
}
} catch (Exception e) {
System.err.println("ERROR in listenFn: " + e);
e.printStackTrace(System.err);
}
}
