/**
* Initializes and binds a socket that on a random port number. The method would try to bind on a
* random port and retry 5 times until a free port is found.
*
* @return the socket that we have initialized on a randomport number.
*/
private DatagramSocket initRandomPortSocket() {
DatagramSocket resultSocket = null;
String bindRetriesStr =
NetaddrActivator.getConfigurationService().getString(BIND_RETRIES_PROPERTY_NAME);
int bindRetries = 5;
if (bindRetriesStr != null) {
try {
bindRetries = Integer.parseInt(bindRetriesStr);
} catch (NumberFormatException ex) {
logger.error(
bindRetriesStr
+ " does not appear to be an integer. "
+ "Defaulting port bind retries to "
+ bindRetries,
ex);
}
}
int currentlyTriedPort = NetworkUtils.getRandomPortNumber();
// we'll first try to bind to a random port. if this fails we'll try
// again (bindRetries times in all) until we find a free local port.
for (int i = 0; i < bindRetries; i++) {
try {
resultSocket = new DatagramSocket(currentlyTriedPort);
// we succeeded - break so that we don't try to bind again
break;
} catch (SocketException exc) {
if (exc.getMessage().indexOf("Address already in use") == -1) {
logger.fatal(
"An exception occurred while trying to create" + "a local host discovery socket.",
exc);
resultSocket = null;
return null;
}
// port seems to be taken. try another one.
logger.debug("Port " + currentlyTriedPort + " seems in use.");
currentlyTriedPort = NetworkUtils.getRandomPortNumber();
logger.debug("Retrying bind on port " + currentlyTriedPort);
}
}
return resultSocket;
}
/**
* Create a multicast socket and join the multicast group. This method creates a multicast socket
* that is used to broadcast The <CODE>DiscoveryResponder</CODE> will then join the multicast
* group and send a join message. This method has no effect if the <CODE>DiscoveryResponder</CODE>
* is <CODE>ONLINE</CODE> or <CODE>STOPPING</CODE> or <CODE>STARTING</CODE>.
*
* @exception IOException The creation of the Multicast socket failed.
*/
public void start() throws IOException {
if (state == OFFLINE) {
changeState(STARTING);
if (cmf == null) {
if (logger.finerOn()) {
logger.finer("start ", "Can't start discoveryResponder: JDMK MBeanServer is not set");
}
return;
}
// ----------------
// Create a new obj to receive multicast msg ;
// ----------------
try {
if (logger.finerOn()) {
logger.finer("start ", "Create a new responder");
}
responder =
new ActualResponder(multicastGroup, multicastPort, getTimeToLive(), cmf, spy, this);
if (local != null) {
responder.setLocalHost(local);
}
// NPCTE fix for bugId 4499338, esc 0, 04 Sept 2001
if (usrInet != null) {
responder.setInterface(usrInet);
if (logger.finerOn()) {
logger.finer("start ", "set interface to " + usrInet);
}
}
// end of NPCTE fix for bugId 4499338
if (noEvent != null) responder.noEvent();
if (logger.finerOn()) {
logger.finer("start ", "call responder connect");
}
responder.connectToGroup();
// ----------------
// Create a new thread to receive multicast msg ;
// ----------------
// responderThread = cmf.getThreadAllocatorSrvIf().obtainThread(responderObjectName,
// responder);
responderThread = new Thread(responder);
responderThread.setName("Multicast responder");
// ----------------
// Start thread
// ----------------
responderThread.start();
// ----------------
// Update state
// ----------------
// changeState(ONLINE) ;
} catch (SocketException e) {
if (logger.finestOn()) {
logger.finest("start", e);
}
throw new IOException(e.getMessage());
} catch (IOException e) {
// ------------------------
// Keep exception for us
// ------------------------
if (logger.finestOn()) {
logger.finest("start ", e);
}
throw e;
} catch (NullPointerException e) {
// ------------------------
// the set group did not worked
// ------------------------
if (logger.finestOn()) {
logger.finest("start ", e);
}
throw new IOException(e.getMessage());
}
} else {
if (logger.finerOn()) {
logger.finer("start ", "Responder is not OFFLINE");
}
}
}
