void doSend(byte[] data, InetAddress dest, int port) throws IOException {
DatagramPacket packet;
packet = new DatagramPacket(data, data.length, dest, port);
if (sock != null) {
sock.send(packet);
}
}
/**
* Workaround for the problem encountered in certains JDKs that a thread listening on a socket
* cannot be interrupted. Therefore we just send a dummy datagram packet so that the thread 'wakes
* up' and realizes it has to terminate. Should be removed when all JDKs support
* Thread.interrupt() on reads. Uses sock t send dummy packet, so this socket has to be still
* alive.
*
* @param dest The destination host. Will be local host if null
* @param port The destination port
*/
void sendDummyPacket(InetAddress dest, int port) {
DatagramPacket packet;
byte[] buf = {0};
if (dest == null) {
try {
dest = InetAddress.getLocalHost();
} catch (Exception e) {
}
}
if (Trace.debug) {
Trace.info("UDP.sendDummyPacket()", "sending packet to " + dest + ":" + port);
}
if (sock == null || dest == null) {
Trace.warn(
"UDP.sendDummyPacket()", "sock was null or dest was null, cannot send dummy packet");
return;
}
packet = new DatagramPacket(buf, buf.length, dest, port);
try {
sock.send(packet);
} catch (Throwable e) {
Trace.error(
"UDP.sendDummyPacket()",
"exception sending dummy packet to " + dest + ":" + port + ": " + e);
}
}
void handleDiagnosticProbe(InetAddress sender, int port) {
try {
byte[] diag_rsp = getDiagResponse().getBytes();
DatagramPacket rsp = new DatagramPacket(diag_rsp, 0, diag_rsp.length, sender, port);
if (Trace.trace) {
Trace.info(
"UDP.handleDiagnosticProbe()", "sending diag response to " + sender + ":" + port);
}
sock.send(rsp);
} catch (Throwable t) {
Trace.error(
"UDP.handleDiagnosticProbe()",
"failed sending diag rsp to " + sender + ":" + port + ", exception=" + t);
}
}