void handleMessage(Message msg) {
Event evt;
UdpHeader hdr;
// discard my own multicast loopback copy
if (loopback) {
Address dst = msg.getDest();
Address src = msg.getSrc();
if (dst != null && dst.isMulticastAddress() && src != null && local_addr.equals(src)) {
if (Trace.debug) {
Trace.info("UDP.handleMessage()", "discarded own loopback multicast packet");
}
return;
}
}
evt = new Event(Event.MSG, msg);
if (Trace.debug) {
Trace.info("UDP.handleMessage()", "message is " + msg + ", headers are " + msg.getHeaders());
/* Because Protocol.up() is never called by this bottommost layer, we call up() directly in the observer.
* This allows e.g. PerfObserver to get the time of reception of a message */
}
if (observer != null) {
observer.up(evt, up_queue.size());
}
hdr = (UdpHeader) msg.removeHeader(name);
if (hdr != null) {
/* Discard all messages destined for a channel with a different name */
String ch_name = null;
if (hdr.group_addr != null) {
ch_name = hdr.group_addr;
// Discard if message's group name is not the same as our group name unless the
// message is a diagnosis message (special group name DIAG_GROUP)
}
if (ch_name != null
&& group_addr != null
&& !group_addr.equals(ch_name)
&& !ch_name.equals(Util.DIAG_GROUP)) {
if (Trace.trace) {
Trace.warn(
"UDP.handleMessage()",
"discarded message from different group ("
+ ch_name
+ "). Sender was "
+ msg.getSrc());
}
return;
}
} else {
Trace.error("UDP.handleMessage()", "message does not have a UDP header");
}
passUp(evt);
}
