/**
* Send a packet to the multicast group. Messages have the form (name): msg
*
* @param message message
*/
public void sendToGroup(final String message) {
try {
if (LOG.isInfoEnabled()) {
LOG.info(BUNDLE_MARKER, "Sending packet to group: " + message);
}
final DatagramPacket sendPacket = toDatagramPacket(message, groupAddress, GROUP_PORT);
groupSocket.send(sendPacket);
if (LOG.isInfoEnabled()) {
LOG.info(BUNDLE_MARKER, "Packet sent to group: " + message);
}
} catch (IOException ioe) {
LOG.error(BUNDLE_MARKER, "Failed to send packet: " + ioe.toString(), ioe);
}
}
/**
* Checks if the LOCAL_PORT is availible. If not try another one.
*
* @param startport Start port, try first to open.
* @return a DatagramSocket for the Registry.
*/
private static DatagramSocket getAvailableSocket(final int startport) throws SocketException {
SocketException lastex = null;
for (int port = startport; port < LOCAL_PORT + MAX_PORT_RANGE; port++) {
try {
DatagramSocket ds = new DatagramSocket(port);
LOG.info("LOCAL_PORT=" + port);
return ds;
} catch (SocketException e) {
lastex = e;
LOG.info("LOCAL_PORT " + port + " already in use - trying " + (port + 1));
}
}
throw lastex;
}
/** Stops all listeners. */
public void stop() {
if (LOG.isInfoEnabled()) {
LOG.info(BUNDLE_MARKER, "Shutting down node " + this.nodeId);
}
// not necessary - we remove the node on the directoty level
// sendToGroup(BYE + " " + nodeId);
setRunning(false);
}
/**
* Repeatedly receive a packet from the group, process it. No messages are sent from here.
* sendPacket().
*/
public void receiveGroupMessages() {
if (LOG.isDebugEnabled()) {
LOG.debug("Starting group receive loop for " + nodeId);
}
while (this.isRunning()) {
try {
final byte[] data = new byte[BUFFER_SIZE]; // set up an empty packet
final DatagramPacket packet = new DatagramPacket(data, data.length);
if (LOG.isDebugEnabled()) {
LOG.debug("Waiting for group message on " + groupSocket);
}
groupSocket.receive(packet); // wait for a packet
final String msg = toString(packet);
if (LOG.isDebugEnabled()) {
LOG.debug(
"Received group msg "
+ msg
+ " from "
+ packet.getAddress()
+ ":"
+ packet.getPort()
+ ".");
}
processGroupMessage(msg);
} catch (SocketTimeoutException e) {
if (LOG.isInfoEnabled()) {
LOG.info(BUNDLE_MARKER, "GroupSocket receive timed out.");
}
} catch (IOException e) {
LOG.error(BUNDLE_MARKER, e.toString(), e);
} catch (Throwable t) {
LOG.error(BUNDLE_MARKER, t.toString(), t);
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("Group receive loop for " + nodeId + " was stopped.");
}
}
/**
* Processes a message.
*
* @param message message
* @throws IOException if something goes wrong
*/
private void processGroupMessage(final String message) throws IOException {
try {
final MultiCastMessage multiCastMessage = new MultiCastMessage(message);
if (multiCastMessage.getType() == MultiCastMessage.Type.HI
&& multiCastMessage.getNodeId() != RegistryImpl.getInstance().getNodeId()) {
final InetAddress address = multiCastMessage.getSenderAddress();
final int port = multiCastMessage.getSenderPort();
// we don't use datagramPacket.getAddress(), because of
// http://bugs.sun.com/view_bug.do?bug_id=4717228
// -hendrik
sendPrivateMessage(
new MultiCastMessage(nodeId, MultiCastMessage.Type.HI, getSender()), address, port);
}
if (LOG.isInfoEnabled()) {
LOG.info(BUNDLE_MARKER, "(NODE) processing node message: " + message);
}
if (multiCastMessage.isValid()) {
multiCastMessage.setDirection(Direction.IN);
fireMessage(multiCastMessage);
}
} catch (RuntimeException e) {
LOG.error(BUNDLE_MARKER, "Failed to process group message: " + e.toString(), e);
}
}