public void invokeAsynchronous(byte[] request, ReplyListener listener, int[] targets) {
reqId = generateRequestId(TOMMessageType.UNORDERED_REQUEST);
requestType = TOMMessageType.UNORDERED_REQUEST;
replyQuorum =
(int)
Math.ceil(
(getViewManager().getCurrentViewN() + getViewManager().getCurrentViewF()) / 2)
+ 1;
this.replyListener = listener;
if (this.getViewManager().getStaticConf().isTheTTP()) {
requestType = TOMMessageType.STATUS_REPLY;
try {
sendMessageToTargets(request, reqId, targets);
} catch (RuntimeException re) {
if (re.getMessage().equals("Server not connected")) {
TOMMessage tm =
new TOMMessage(
targets[0],
0,
reqId,
TOMUtil.getBytes(StatusReply.OFFLINE.toString()),
0,
requestType);
listener.replyReceived(tm);
}
}
} else sendMessageToTargets(request, reqId, targets);
}
/**
* This is the method invoked by the client side communication system.
*
* @param reply The reply delivered by the client side communication system
*/
@Override
public void replyReceived(TOMMessage reply) {
canReceiveLock.lock();
if (reqId == -1) { // no message being expected
Logger.println(
"throwing out request: sender=" + reply.getSender() + " reqId=" + reply.getSequence());
canReceiveLock.unlock();
return;
}
int pos = getViewManager().getCurrentViewPos(reply.getSender());
if (pos < 0) { // ignore messages that don't come from replicas
canReceiveLock.unlock();
return;
}
if (reply.getSequence() == reqId && reply.getReqType() == requestType) {
if (replyListener != null) {
replyListener.replyReceived(reply);
canReceiveLock.unlock();
return;
}
Logger.println(
"Receiving reply from "
+ reply.getSender()
+ " with reqId:"
+ reply.getSequence()
+ ". Putting on pos="
+ pos);
if (replies[pos] == null) {
receivedReplies++;
}
replies[pos] = reply;
// Compare the reply just received, to the others
int sameContent = 1;
for (int i = 0; i < replies.length; i++) {
if (i != pos
&& replies[i] != null
&& (comparator.compare(replies[i].getContent(), reply.getContent()) == 0)) {
sameContent++;
if (sameContent >= replyQuorum) {
response = extractor.extractResponse(replies, sameContent, pos);
reqId = -1;
this.sm.release(); // resumes the thread that is executing the "invoke" method
break;
}
}
}
if (response == null) {
if (requestType.equals(TOMMessageType.ORDERED_REQUEST)) {
if (receivedReplies == getViewManager().getCurrentViewN()) {
reqId = -1;
this.sm.release(); // resumes the thread that is executing the "invoke" method
}
} else { // UNORDERED
if (receivedReplies != sameContent) {
reqId = -1;
this.sm.release(); // resumes the thread that is executing the "invoke" method
}
}
}
}
// Critical section ends here. The semaphore can be released
canReceiveLock.unlock();
}