class Scheduler():
def __init__(self, aCpu):
self.currentQueue = FifoQueue()
self.cpu = aCpu
def getNextPcb(self):
return self.currentQueue.getMax()
def addPcb(self, pcb):
if(self.currentQueue.isEmpty() and not(self.cpu.havePcb())):
pcb.toRunning()
self.cpu.assignPcb(pcb)
else:
self.currentQueue.addPcb(pcb)
def setFIFOMode(self):
self.currentQueue = FifoQueue()
def setPriorityMode(self):
self.currentQueue = PriorityQueue(3,3)
def removePid(self, aPid):
self.currentQueue.removePid(aPid)
class PriorityQueueTest(unittest.TestCase):
def setUp(self):
self.priority = PriorityQueue(3,5)
self.aPcb1 = Mock()
when(self.aPcb1).getPriority().thenReturn(2)
self.aPcb2 = Mock()
when(self.aPcb2).getPriority().thenReturn(2)
def test_addPcb_initialAdd(self):
self.priority.addPcb(self.aPcb1)
chance = self.priority.table.get(6)
assert (chance.elementos[0] == self.aPcb1)
def test_addPcb_withPcb(self):
self.priority.addPcb(self.aPcb1)
self.priority.addPcb(self.aPcb2)
chance = self.priority.table.get(6)
assert (chance.elementos[0] == self.aPcb2)
assert (chance.elementos[1] == self.aPcb1)
def test_getMax(self):
self.priority.addPcb(self.aPcb1)
self.priority.addPcb(self.aPcb2)
aPcb3 = Mock()
when(aPcb3).getPriority().thenReturn(4)
self.priority.addPcb(aPcb3)
assert (self.priority.getMax() == aPcb3)
assert (self.priority.getMax() == self.aPcb1)
def test_cleanChances(self):
chan1 = Chance()
chan2 = Chance()
chan3 = Chance()
aPcb = Mock()
chan2.elementos = [aPcb]
self.priority.table = {1:chan1,2:chan2,3:chan3}
assert(self.priority.table[1] == chan1)
assert(self.priority.table[2] == chan2)
assert(self.priority.table[3] == chan3)
assert(len(self.priority.table) == 3)
self.priority.cleanChances()
assert(len(self.priority.table) == 1)
assert(self.priority.table[2] == chan2)