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QueueNetwork.py
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QueueNetwork.py
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from MyQueue import Queue
import numpy as np
import unittest as ut
class QueueNetwork:
"""Class for operating a queue network in discrete time."""
##
# Initialize a queue network given a size, service rates and initial workloads.
# If only a size was given, all queues will have service rate = 1, workload = 0.
# All parameters are integers where size > 0, all service rates > 0 and workloads >= 0.
##
def __init__(self, size, services=[], workloads=[]):
_size = int(size)
_services = services
_workloads = workloads
if _size < 1:
raise Exception("Illegal size for QueueNetwork")
for i in range(len(_services)):
_services[i] = int(_services[i])
if _services[i] < 1:
raise Exception("Illegal service rates for QueueNetwork")
for i in range(len(_workloads)):
_workloads[i] = int(_workloads[i])
if _workloads[i] < 0:
raise Exception("Illegal workloads for QueueNetwork")
if not _services:
_services = [1 for i in range(_size)]
if not _workloads:
_workloads = [0 for i in range(_size)]
# Member fields init.
self.queues = [Queue(_services[i], _workloads[i]) for i in range(_size)]
self.totalWorkload = np.sum(_workloads)
self.size = _size
self.time = 0
##
# Resets all queues to @services and workload of 0.
##
def reset(self, services=[]):
_services = services
if len(_services) == 0:
_services = [1]*self.getSize()
if len(_services) != self.getSize():
raise Exception("Services vector size mismatch with queue network size while trying to reset")
for i in range(self.getSize()):
self.queues[i].reset(_services[i])
self.time = 0
self.totalWorkload = 0
# assert self.totalWorkload == np.sum(self.getWorkloads()), "lhs = " + str(self.totalWorkload) + " rhs = " + str(np.sum(self.getWorkloads()))
##
# Resets all queues to workload of 0.
##
def flush(self):
for q in self.queues:
q.reset(q.getService())
self.time = 0
self.totalWorkload = 0
# assert self.totalWorkload == np.sum(self.getWorkloads()), "lhs = " + str(self.totalWorkload) + " rhs = " + str(np.sum(self.getWorkloads()))
##
# Get the time passed in the network.
##
def getTime(self):
return self.time
##
# Set the time passed in the network.
##
def setTime(self, time):
if int(time) < 0:
raise Exception("Trying to set the network time to a negative value")
self.time = int(time)
##
# Returns a list of the current services.
##
def getServices(self):
services = [q.getService() for q in self.queues]
return services
##
# Returns a list of the current workloads.
##
def getWorkloads(self):
workloads = [q.getWorkload() for q in self.queues]
return workloads
##
# Returns the total workload in the network.
##
def getTotalWorkload(self):
# assert self.totalWorkload == np.sum(self.getWorkloads()), "lhs = " + str(self.totalWorkload) + " rhs = " + str(np.sum(self.getWorkloads()))
return self.totalWorkload
##
# Returns the number of queues in the network.
##
def getSize(self):
return self.size
##
# Sets the services to the given sizes. services are integers and are > 0.
##
def setServices(self, services=[]):
if not services or len(services) != self.size:
raise Exception("Illegal number of service rates for setServices")
for i in range(self.size):
if int(services[i]) < 1:
raise Exception("Illegal service rates for setServices")
for i in range(self.size):
self.queues[i].setService(int(services[i]))
##
# Sets the workloads to the given sizes. Workloads are integers and are >= 0.
##
def setWorkloads(self, workloads=[]):
if not workloads or len(workloads) != self.size:
raise Exception("Illegal number of workloads for setWorkloads")
for i in range(self.size):
if int(workloads[i]) < 0:
raise Exception("Illegal workloads for setWorkloads")
self.totalWorkload = 0
for i in range(self.size):
self.queues[i].setWorkload(int(workloads[i]))
self.totalWorkload += int(workloads[i])
# assert self.totalWorkload == np.sum(self.getWorkloads()), "lhs = " + str(self.totalWorkload) + " rhs = " + str(np.sum(self.getWorkloads()))
##
# Adds the given workloads to the specified queues.
# If no index is given, workloads size must be self.getSize() and will be added to all queues accordingly.
# Notice: this method can be used to decrease the workload if passing a negative value.
##
def addWorkload(self, chosen, workloads):
if len(chosen) < 1 or len(chosen) != len(workloads):
raise Exception("Illegal size of queues or workloads for addWorkload")
_workloads = [int(workload) for workload in workloads]
if np.sum(workloads) != np.sum(_workloads):
raise Exception("OUCH!!!")
for i in range(len(chosen)):
self.queues[chosen[i]].addWorkload(_workloads[i])
self.totalWorkload += _workloads[i]
# assert self.totalWorkload == np.sum(self.getWorkloads()), "lhs = " + str(self.totalWorkload) + " rhs = " + str(np.sum(self.getWorkloads())) + " added = " + str(_workloads)
##
# Reduces the amount of workload in every queue by its service.
##
def endTimeSlot(self):
for q in self.queues:
self.totalWorkload -= q.endTimeSlot()
# assert self.totalWorkload == np.sum(self.getWorkloads()), "lhs = " + str(self.totalWorkload) + " rhs = " + str(np.sum(self.getWorkloads()))
##
# Increments the time that passed.
##
def advanceTimeSlot(self):
for q in self.queues:
q.advanceTimeSlot()
self.time += 1
########################################################################################################################
# TEST
########################################################################################################################
class TestQueueNetwork(ut.TestCase):
def runTest(self):
with self.assertRaises(Exception):
QueueNetwork(size=0)
with self.assertRaises(Exception):
QueueNetwork(size=-1)
with self.assertRaises(Exception):
QueueNetwork(size=2, services=[1, 0])
with self.assertRaises(Exception):
QueueNetwork(size=2, workloads=[1, -2])
q = QueueNetwork(size=2)
self.assertEqual(q.getSize(), 2)
wlds = q.getWorkloads()
self.assertEqual(wlds, [0] * len(wlds))
self.assertEqual(q.getServices(), [1] * len(wlds))
q.setWorkloads([100, 200])
wlds = q.getWorkloads()
self.assertEqual(wlds, [100, 200])
q.setServices([1, 2])
self.assertEqual(q.getServices(), [1, 2])
with self.assertRaises(Exception):
q.setWorkloads([10, -1])
with self.assertRaises(Exception):
q.setServices([0, 1])
self.assertEqual(q.getTime(), 0)
q.setTime(10)
self.assertEqual(q.getTime(), 10)
q. setTime(0)
self.assertEqual(q.getTime(), 0)
self.assertEqual(q.getTotalWorkload(), 300)
q.addWorkload(index=range(len(wlds)), workloads=[-199] * len(wlds))
self.assertEqual(q.getWorkloads(), [0, 1])
self.assertEqual(q.getTotalWorkload(), 1)
q.endTimeSlot()
self.assertEqual(q.getWorkloads(), [0] * len(wlds))
q.addWorkload([-7] * len(wlds))
self.assertEqual(q.getWorkloads(), [0] * len(wlds))
q.addWorkload([123] * len(wlds))
self.assertEqual(q.getWorkloads(), [123] * len(wlds))
q.endTimeSlot()
self.assertEqual(q.getWorkloads(), [122, 121])
q.addWorkload([10] * len(wlds))
self.assertEqual(q.getWorkloads(), [132, 131])
q.advanceTimeSlot()
self.assertEqual(q.getTime(), 1)
q.flush()
self.assertEqual(q.getServices(), [1, 2])
self.assertEqual(q.getWorkloads(), [0] * len(wlds))
self.assertEqual(q.getTime(), 0)
self.assertEqual(q.getTotalWorkload(), 0)
q.reset()
self.assertEqual(q.getServices(), [1] * len(wlds))
self.assertEqual(q.getWorkloads(), [0] * len(wlds))
self.assertEqual(q.getTime(), 0)
self.assertEqual(q.getTotalWorkload(), 0)
print "TestQueueNetwork: OK."
if __name__ == '__main__':
ut.main()