--- a
+++ b/src/policies/DIF/RMT/MaxQueue/UpstreamNotifier/UpstreamNotifier.cc
@@ -0,0 +1,65 @@
+//
+// Copyright Š 2014 - 2015 PRISTINE Consortium (http://ict-pristine.eu)
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see http://www.gnu.org/licenses/.
+//
+
+#include <UpstreamNotifier.h>
+
+Define_Module(UpstreamNotifier);
+
+void UpstreamNotifier::onPolicyInit()
+{
+
+}
+
+bool UpstreamNotifier::run(RMTQueue* queue)
+{
+ // simple version:
+ // Send out the notification when an output (N-1)-port is overflowing.
+
+ if (queue->getLength() >= queue->getMaxLength())
+ {
+ if (queue->getType() == RMTQueue::OUTPUT)
+ { // (N-1)-port output queues are filling up => stop accepting more PDUs
+ notifySenderOfCongestion(queue->getLastPDU());
+ }
+ }
+
+ // extended version:
+ // !!! CURRENTLY NOT WORKING, will be available in the next release.
+ // When an output buffer is overflowing, disable reading data from the input
+ // buffer sending data to it. When the input buffer starts to overflow as well,
+ // send out the notification.
+
+// if (queue->getLength() >= queue->getMaxLength())
+// {
+// if (queue->getType() == RMTQueue::OUTPUT)
+// {
+// disableSenderPortDrain(queue->getLastPDU());
+// }
+// else if (queue->getType() == RMTQueue::INPUT)
+// {
+// notifySenderOfCongestion(queue->getLastPDU());
+// }
+// }
+// else if ((queue->getLength() == queue->getThreshLength()) &&
+// port->hasBlockedInput())
+// { // the output buffers are keeping up again, continue receiving on input
+// port->unblockInput();
+// }
+
+ return false;
+}
+