def next(self,event):
if len(self.queue) > 0:
Sim.trace_custom('%d' % (len(self.queue)), 'queue', self.filename)
packet = self.queue.pop(0)
#Sim.trace_custom('%d' % (len(self.queue)), 'queue', self.filename)
self.transmit(packet)
else:
self.busy = False
def handle_packet(self,packet):
# drop packet due to queue overflow
if self.queue_size and len(self.queue) == self.queue_size:
Sim.trace("! %d dropped packet due to queue overflow" % (self.address))
Sim.trace_custom('x', 'queue', self.filename)
return
# drop packet due to random loss
if self.loss > 0 and random.random() < self.loss:
Sim.trace("! %d dropped packet due to random loss" % (self.address))
return
packet.enter_queue = Sim.scheduler.current_time()
#Sim.trace("packet %d entered queue" % packet.sequence)
if len(self.queue) == 0 and not self.busy:
# packet can be sent immediately
self.busy = True
self.transmit(packet)
else:
# add packet to queue
Sim.trace_custom('%d' % (len(self.queue)), 'queue', self.filename)
self.queue.append(packet)
