/** INTERNAL: Send out an announcement that we are here. */
public void announceSession() {
rcm.logDebug("sending_announcement", (Object[]) null);
ServiceAnnouncement outMsg = new ServiceAnnouncement(rcm.getServiceId());
byte[] outBytes = outMsg.toBytes();
try {
// Create a packet to send and send it out to everyone listening
DatagramPacket sendPacket =
new DatagramPacket(
outBytes,
outBytes.length,
InetAddress.getByName(multicastGroupAddress),
multicastPort);
getCommunicationSocket().send(sendPacket);
Object[] args = null;
rcm.logInfo("announcement_sent", args);
} catch (Exception ex) {
// We got an exception. Map it to an RCM exception and call the handler
DiscoveryException discoveryEx = DiscoveryException.errorSendingAnnouncement(ex);
rcm.handleException(discoveryEx);
}
}
/** INTERNAL: Create the multicast socket and join the multicast group. */
public void createCommunicationSocket() {
Object[] args = {multicastGroupAddress, "" + multicastPort};
rcm.logDebug("initializing_discovery_resources", args);
if (communicationSocket == null) {
try {
communicationSocket = new MulticastSocket(multicastPort);
communicationSocket.setTimeToLive(getPacketTimeToLive());
communicationSocket.joinGroup(InetAddress.getByName(multicastGroupAddress));
} catch (IOException ex) {
// Either we couldn't create the socket or we couldn't join the group
DiscoveryException discoveryEx = DiscoveryException.errorJoiningMulticastGroup(ex);
rcm.handleException(discoveryEx);
}
}
}
/**
* INTERNAL: This method puts us into the listening mode loop. This thread blocks, waiting on
* announcements that we receive from other discovery managers.
*/
public void startListening() {
byte[] recvBuf = new byte[128];
// Only stop when we get the directive to stop
stopListening = false;
rcm.logInfo("discovery_manager_active", (Object[]) null);
while (!stopListening) {
DatagramPacket recvPacket = new DatagramPacket(recvBuf, recvBuf.length);
ServiceAnnouncement inMsg;
// Block waiting for a message
try {
getCommunicationSocket().receive(recvPacket);
} catch (IOException exception) {
if (stopListening) {
// We caused the exception by closing the socket
rcm.logInfo("discovery_manager_stopped", (Object[]) null);
return;
} else {
// Exception was caused by something else (e.g. network error, etc.)
rcm.handleException(DiscoveryException.errorReceivingAnnouncement(exception));
}
}
// We received a message, unmarshall it into an announcement
try {
inMsg = new ServiceAnnouncement(recvPacket.getData());
} catch (Exception ex) {
// Log a warning that we couldn't process the announcement
Object[] args = {ex};
rcm.logWarning("received_corrupt_announcement", args);
continue;
}
// If the msg is not from ourselves, and is announcing a service on
// the same channel as we are on then we should do something about it
if (!rcm.getServiceId().getId().equals(inMsg.getServiceId().getId())
&& (rcm.getServiceId()
.getChannel()
.equalsIgnoreCase(inMsg.getServiceId().getChannel()))) {
receivedAnnouncement(inMsg.getServiceId());
}
}
}