def updateQoE(srv_ip, qoe, alpha=0.1, window=6):
## Revision by chenw-2015-0317, read QoE updated to overlay not the previous sample.
# last_qoe = QoE.objects.filter(srv=srv).order_by('-time')[0]
# print('Last qoe value for server ', srv, ' is ', last_qoe.qoe)
# previous_qoe = float(last_qoe.qoe)
srv_obj = Server.objects.filter(ip=srv_ip)[0]
srv_name = srv_obj.name
new_qoe_obj = QoE(qoe=qoe, srv=srv_name)
new_qoe_obj.save()
print('New qoe is ', qoe)
## Get the server's previous exp_sqs and update exp_sqs
# srv_id = int(re.findall(r'\d+', srv)[0])
# srv_obj = Server.objects.filter(ip=srv)[0]
previous_exp_sqs= float(srv_obj.exp_sqs)
exp_sqs = (1 - alpha) * previous_exp_sqs + alpha * qoe
## Get the server's ave_sqs for server, srv
latest_qoes = QoE.objects.filter(srv=srv_name).order_by('-id')[:window]
qoe_num = latest_qoes.count()
total_qoe = 0.0
for qoe_obj in latest_qoes:
total_qoe = total_qoe + float(qoe_obj.qoe)
ave_sqs = total_qoe / float(qoe_num)
update_overlay_qoe(srv_name, exp_sqs, ave_sqs)
def initializeQoE():
existingQoE = QoE.objects.all()
if existingQoE.count() > 0:
existingQoE.delete()
srvs = Server.objects.all()
for s in srvs:
print("Initialize QoE for server", s.name)
if s.isLocal:
q = 5.0
else:
q = 4.0
cur_qoe = QoE(qoe=q, srv=s.name)
cur_qoe.save()
s.qoe = q
s.save()
