def __init__(self, space=16384, os=4096):
'''
Constructor
'''
self.space = space # total space of memory
self.os = os # space of OS in memory
self.elapsedTime = 0
self.jobProcessed = 0
# create OS partition and free partition called "main"
# double link partition in memory
self.osPartition = MyPartition("OS partition", 4096, "Undefined", "OS",
[0, self.os])
self.mainPartition = MyPartition("blank partition", 12288, 0,
"Available", [self.os, self.space])
self.osPartition.nextPartition = self.mainPartition
self.mainPartition.prevPartition = self.osPartition
# get data from text file and put them in entry queue
dataQueue = ReadData()
dataQueue.readDataFile(dataQueue.filename)
self.entryQueue = MyQueue()
self.entryQueue = dataQueue.entryQueue
# variables used to compute statistics of best-fit, first-fit, and next-fit
self.entryQueueLength = {}
self.memoryRatio = {}
self.fragmentation = {}
# variable used to store memory output
self.output = ''
def reverseK(queue, k):
if k > queue.size() or k < 0 or queue.is_empty():
return None
stack = MyStack()
new_q = MyQueue()
for i in range(k):
v = queue.dequeue()
stack.push(v)
while not stack.is_empty():
v = stack.pop()
new_q.enqueue(v)
while not queue.is_empty():
v = queue.dequeue()
new_q.enqueue(v)
return new_q
class MyMemory():
'''
class used to simulate memory management for best-fit, first-fit, and next-fit
'''
def __init__(self, space=16384, os=4096):
'''
Constructor
'''
self.space = space # total space of memory
self.os = os # space of OS in memory
self.elapsedTime = 0
self.jobProcessed = 0
# create OS partition and free partition called "main"
# double link partition in memory
self.osPartition = MyPartition("OS partition", 4096, "Undefined", "OS",
[0, self.os])
self.mainPartition = MyPartition("blank partition", 12288, 0,
"Available", [self.os, self.space])
self.osPartition.nextPartition = self.mainPartition
self.mainPartition.prevPartition = self.osPartition
# get data from text file and put them in entry queue
dataQueue = ReadData()
dataQueue.readDataFile(dataQueue.filename)
self.entryQueue = MyQueue()
self.entryQueue = dataQueue.entryQueue
# variables used to compute statistics of best-fit, first-fit, and next-fit
self.entryQueueLength = {}
self.memoryRatio = {}
self.fragmentation = {}
# variable used to store memory output
self.output = ''
'''
insert job using first-fit algorithm
'''
def insertProcessFirstFit(self, number, size, duration):
memoryPartition = self.osPartition
while (True):
# partition is OS: just skip to the next partition
if (memoryPartition.status == "OS"):
memoryPartition = memoryPartition.nextPartition
continue
# partition is not blank partition skip
if (memoryPartition.status != "Available"):
if (self.checkAvailableSpace(memoryPartition)):
memoryPartition = memoryPartition.nextPartition
continue
# reach end of memory
else:
self.updateMemory()
# calculation of fragmentation over time
fragmentation = self.findFragmentation()
if (fragmentation != None):
self.fragmentation[self.elapsedTime] = fragmentation
while (not (self.checkProcessIfDone())):
self.updateMemory()
done = self.insertProcessFirstFit(number, size, duration)
if (done): # insertion is done
return True
# if partition is blank check size: if enough put new process in
if (memoryPartition.status == "Available"):
if (memoryPartition.size > int(size[0:-1])):
memoryPartition.name = "Process " + number
memoryPartition.duration = duration
memoryPartition.status = "Processing"
memoryPartition.space = [
memoryPartition.space[0],
memoryPartition.space[0] + int(size[0:-1])
]
if (self.checkAvailableSpace(memoryPartition)):
nextPartition = memoryPartition.nextPartition
newNextPartition = MyPartition(
"blank partition",
memoryPartition.size - int(size[0:-1]), 0,
"Available", [
memoryPartition.space[0] + int(size[0:-1]),
memoryPartition.space[0] + memoryPartition.size
])
memoryPartition.size = int(size[0:-1])
memoryPartition.nextPartition = newNextPartition
newNextPartition.prevPartition = memoryPartition
newNextPartition.nextPartition = nextPartition
nextPartition.prevPartition = newNextPartition
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt().itemNumber
) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt(
).timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
# reach end of memory
else:
newNextPartition = MyPartition(
"blank partition",
memoryPartition.size - int(size[0:-1]), 0,
"Available", [
memoryPartition.space[0] + int(size[0:-1]),
memoryPartition.space[0] + memoryPartition.size
])
memoryPartition.size = int(size[0:-1])
memoryPartition.nextPartition = newNextPartition
newNextPartition.prevPartition = memoryPartition
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt().itemNumber
) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt(
).timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
if (memoryPartition.size == size[0:-1]):
memoryPartition.name = "Process " + number
memoryPartition.duration = duration
memoryPartition.status = "Processing"
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt(
).itemNumber) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt(
).timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
if (memoryPartition.size < size[0:-1]):
if (self.checkAvailableSpace(memoryPartition)):
memoryPartition = memoryPartition.nextPartition
continue
# reach end of memory
else:
self.updateMemory()
# calculation of fragmentation over time
fragmentation = self.findFragmentation()
if (fragmentation != None):
self.fragmentation[
self.elapsedTime] = fragmentation
while (not (self.checkProcessIfDone())):
self.updateMemory()
done = self.insertProcessFirstFit(
number, size, duration)
if (done): # insertion is done
return True
# check space to make sure partition does not go out of memory bounds
# if we reach end of memory, and memory is full: Update memory => need boolean variable for
'''
insert job using best-fit algorithm
'''
def insertProcessBestFit(self, number, size, duration):
# check if there is partition in memory
partition = self.traverseMemory(int(size[0:-1]))
# case : partition exists
if (partition != None):
if (partition.size == int(size[0:-1])):
partition.name = "Process " + number
partition.duration = duration
partition.status = "Processing"
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt().itemNumber) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt().timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
if (partition.size > int(size[0:-1])):
partition.name = "Process " + number
partition.duration = duration
partition.status = "Processing"
partition.space = [
partition.space[0], partition.space[0] + int(size[0:-1])
]
if (self.checkAvailableSpace(partition)):
nextPartition = partition.nextPartition
newNextPartition = MyPartition(
"blank partition", partition.size - int(size[0:-1]), 0,
"Available", [
partition.space[0] + int(size[0:-1]),
partition.space[0] + partition.size
])
partition.size = int(size[0:-1])
partition.nextPartition = newNextPartition
newNextPartition.prevPartition = partition
newNextPartition.nextPartition = nextPartition
nextPartition.prevPartition = newNextPartition
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt(
).itemNumber) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt(
).timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
else:
newNextPartition = MyPartition(
"blank partition", partition.size - int(size[0:-1]), 0,
"Available", [
partition.space[0] + int(size[0:-1]),
partition.space[0] + partition.size
])
partition.size = int(size[0:-1])
partition.nextPartition = newNextPartition
newNextPartition.prevPartition = partition
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt(
).itemNumber) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt(
).timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
# case : partition does not exist
else:
self.updateMemory()
# calculation of fragmentation over time
fragmentation = self.findFragmentation()
if (fragmentation != None):
self.fragmentation[self.elapsedTime] = fragmentation
while (not (self.checkProcessIfDone())):
self.updateMemory()
done = self.insertProcessBestFit(number, size, duration)
if (done): # insertion is done
return True
'''
traverse memory and look for smallest partition to put job
'''
def traverseMemory(self, size):
partition = self.mainPartition
bestPartition = MyPartition("temp", 0)
closest = 0
findOnePartition = False # boolean variable to check for success or failure
# go through main partition
while (partition):
if (partition.status == "Available" and partition.size >= size):
if (findOnePartition):
if (closest > partition.size - size):
bestPartition = partition
closest = partition.size - size
else:
bestPartition = partition
closest = partition.size - size
findOnePartition = True
partition = partition.nextPartition
if (not (findOnePartition)):
return None
return bestPartition
'''
insert job using next-fit algorithm
'''
def insertProcessNextFit(self, number, size, duration):
# look through main memory if it contains job already
partition = self.lookForLastJob()
# case : if it contains job, starts from last job in memory
if (partition != None):
if (self.checkAvailableSpace(partition)):
partition = partition.nextPartition
else:
partition = self.mainPartition
while (partition):
if (partition.status == "Available"):
if (partition.size > int(size[0:-1])):
partition.name = "Process " + number
partition.duration = duration
partition.status = "Processing"
partition.space = [
partition.space[0],
partition.space[0] + int(size[0:-1])
]
if (self.checkAvailableSpace(partition)):
nextPartition = partition.nextPartition
newNextPartition = MyPartition(
"blank partition",
partition.size - int(size[0:-1]), 0,
"Available", [
partition.space[0] + int(size[0:-1]),
partition.space[0] + partition.size
])
partition.size = int(size[0:-1])
partition.nextPartition = newNextPartition
newNextPartition.prevPartition = partition
newNextPartition.nextPartition = nextPartition
nextPartition.prevPartition = newNextPartition
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt().itemNumber
) + ": " + str(self.entryQueue.frontElt().
timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt(
).timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
# reach end of memory
else:
newNextPartition = MyPartition(
"blank partition",
partition.size - int(size[0:-1]), 0,
"Available", [
partition.space[0] + int(size[0:-1]),
partition.space[0] + partition.size
])
partition.size = int(size[0:-1])
partition.nextPartition = newNextPartition
newNextPartition.prevPartition = partition
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt().itemNumber
) + ": " + str(self.entryQueue.frontElt().
timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt(
).timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
if (partition.size == size[0:-1]):
partition.name = "Process " + number
partition.duration = duration
partition.status = "Processing"
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt().itemNumber
) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt(
).timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
if (partition.size < size[0:-1]):
if (self.checkAvailableSpace(partition)):
partition = partition.nextPartition
continue
# reach end of memory
else:
self.updateMemory()
# calculation of fragmentation over time
fragmentation = self.findFragmentation()
if (fragmentation != None):
self.fragmentation[
self.elapsedTime] = fragmentation
while (not (self.checkProcessIfDone())):
self.updateMemory()
done = self.insertProcessNextFit(
number, size, duration)
if (done): # insertion is done
return True
# case : if it does not contain job in memory
elif (not (self.hasJobProcessing())):
partition = self.mainPartition
if (partition.size == int(size[0:-1])):
partition.name = "Process " + number
partition.duration = duration
partition.status = "Processing"
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt().itemNumber) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt().timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
if (partition.size > int(size[0:-1])):
partition.name = "Process " + number
partition.duration = duration
partition.status = "Processing"
partition.space = [
partition.space[0], partition.space[0] + int(size[0:-1])
]
newNextPartition = MyPartition(
"blank partition", partition.size - int(size[0:-1]), 0,
"Available", [
partition.space[0] + int(size[0:-1]),
partition.space[0] + partition.size
])
partition.size = int(size[0:-1])
partition.nextPartition = newNextPartition
newNextPartition.prevPartition = partition
if (not (self.entryQueue.isEmpty())):
self.output += "=> Time spent in entry queue for job " + str(
self.entryQueue.frontElt().itemNumber) + ": " + str(
self.entryQueue.frontElt().timeInQueue) + "\n"
print "=> Time spent in entry queue for job ", self.entryQueue.frontElt(
).itemNumber, ": ", self.entryQueue.frontElt().timeInQueue
self.entryQueue.dequeue()
self.entryQueueLength[
self.elapsedTime] = self.entryQueue.length
return True
'''
look if there is some job in memory
'''
def lookForLastJob(self):
partition = self.mainPartition
foundJob = False
# go through main partition
while (partition):
if (partition.status == "Processing"):
lastJobInMemory = partition
foundJob = True
partition = partition.nextPartition
if (foundJob):
return lastJobInMemory
return None
'''
check if there is partition after a specified partition
specified partition passed as argument
'''
def checkAvailableSpace(self, partition):
temp = MyPartition("temp", 0)
temp = partition
if (temp.nextPartition == None):
return False
return True
'''
increment and decrement time
'''
def updateMemory(self):
# go through each job in memory and decrement duration
temp = self.mainPartition
while (temp):
if (temp.status == "Processing"):
temp.duration = int(temp.duration) - 1
temp = temp.nextPartition
# go through each job in entry queue and increment waiting time
temp = MyElt()
temp = self.entryQueue.frontElt()
while (temp):
temp.timeInQueue = int(temp.timeInQueue) + 1
temp = temp.nextItem
# increment elapsed time
self.elapsedTime = int(self.elapsedTime) + 1
'''
Compute memory in use over time
when memory cannot load the next job
'''
def findMemoryInUse(self):
# go through each job in memory and decrement duration
temp = self.mainPartition
memoryInUse = 0
while (temp):
if (temp.status == "Processing"):
memoryInUse += temp.size
temp = temp.nextPartition
return memoryInUse
'''
Find fragmentation in memory over time
return number of fragmentation with average size
'''
def findFragmentation(self):
# go through each job in memory and decrement duration
temp = self.mainPartition
numFrag = 0
size = 0
while (temp):
if (temp.status == "Available"):
numFrag += 1
size += temp.size
temp = temp.nextPartition
if (numFrag > 0):
averageSize = float(size) / numFrag
return [numFrag, averageSize]
return None
'''
remove job in memory when it is done
check if the next or previous partition are blank and converge them if it is true
'''
def removeProcess(self, partition):
temp = MyPartition("temp", 0)
temp = partition
temp.name = "blank partition"
temp.duration = 0
temp.status = "Available"
if (temp.prevPartition != None):
prevPart = MyPartition("temp", 0)
prevPart = temp.prevPartition
if (prevPart.status == "Available"):
temp = self.combineBlankPartition(prevPart, temp)
if (partition.nextPartition != None):
nextPart = MyPartition("temp", 0)
nextPart = temp.nextPartition
if (nextPart.status == "Available"):
temp = self.combineBlankPartition(temp, nextPart)
# if there is no jobs processing in memory and partitions were not merged correctly
if (not (self.hasJobProcessing())):
self.mainPartition = MyPartition("blank partition", 12288, 0,
"Available",
[self.os, self.space])
self.osPartition.nextPartition = self.mainPartition
self.mainPartition.prevPartition = self.osPartition
self.checkProcessIfDone()
'''
converge blank partition
'''
def combineBlankPartition(self, partition1, partition2):
temp = MyPartition("temp", 0)
temp = partition1
partition1 = temp
temp = partition2
partition2 = temp
if (partition1.status == "Available"
and partition2.status == "Available"):
if (partition1.space[1] == partition2.space[0]):
partition1.nextPartition = partition2.nextPartition
partition1.size += partition2.size
partition1.space[1] = partition2.space[1]
return partition1
'''
check if some jobs are done in memory or not
if so, remove them and return True
false otherwise
'''
def checkProcessIfDone(self):
memoryPartition = self.mainPartition
while (memoryPartition):
if (memoryPartition.status == "Processing"):
if (memoryPartition.duration == 0):
# computation of memory ratio goes HERE
memoryInUse = self.findMemoryInUse()
self.memoryRatio[self.elapsedTime] = memoryInUse
# calculation of fragmentation over time
fragmentation = self.findFragmentation()
if (fragmentation != None):
self.fragmentation[self.elapsedTime] = fragmentation
# increment job processed
self.jobProcessed = int(self.jobProcessed) + 1
self.removeProcess(memoryPartition)
return True
memoryPartition = memoryPartition.nextPartition
return False
'''
print content of memory
'''
def printMemoryPartition(self):
temp = self.osPartition
# print ">> Name: \t\t\t Size: \t\t\t Status:"
while (temp):
print ">> ", temp.name, "\t\t\t", temp.size, "K\t\t\t", temp.status, "\t\t\t", temp.duration
temp = temp.nextPartition
print
print "Job processed: ", self.jobProcessed
print "Elapsed time: ", self.elapsedTime, "fortnights"
return "Job processed: " + str(
self.jobProcessed) + "\nElapsed time: " + str(
self.elapsedTime) + "fortnights"
'''
check if memory still has some job processing
return true, if it does
false otherwise
'''
def hasJobProcessing(self):
temp = self.mainPartition
while (temp):
if (temp.status == "Processing"):
return True
temp = temp.nextPartition
return False
'''
Write data into a text file
'''
def writeDataFile(self, filename, content):
try:
f = open(filename, "w")
f.write(content)
f.close()
except IOError:
pass
'''
simulate memory management
'''
def simulation(self, process, algorithm):
self.output += algorithm + ' Algorithm \n\n'
while (process):
if (algorithm == "First-Fit"):
self.insertProcessFirstFit(process.itemNumber, process.size,
process.duration)
elif (algorithm == "Best-Fit"):
self.insertProcessBestFit(process.itemNumber, process.size,
process.duration)
elif (algorithm == "Next-Fit"):
self.insertProcessNextFit(process.itemNumber, process.size,
process.duration)
process = self.entryQueue.frontElt()
# for debugging purpose
# print
# self.printMemoryPartition()
# print
while (self.hasJobProcessing()):
self.checkProcessIfDone()
if (self.hasJobProcessing()):
self.updateMemory()
# for debugging purpose
# print
# self.printMemoryPartition()
# print
# if there is no jobs processing in memory
if (not (self.hasJobProcessing())):
self.mainPartition = MyPartition("blank partition", 12288, 0,
"Available",
[self.os, self.space])
self.osPartition.nextPartition = self.mainPartition
self.mainPartition.prevPartition = self.osPartition
# self.printMemoryPartition()
throughput = float(self.jobProcessed) / self.elapsedTime
print
self.output += "\n" + self.printMemoryPartition() + "\n"
self.output += str('\n=> Throughput: %4.2f \n\n' % throughput)
# print '=> Throughput: %4.2f \n' % throughput
for key, value in self.entryQueueLength.iteritems():
# print '=> at t = ',key, ' fortnights: ', value, ' job in Entry Queue'
self.output += '=> at t = ' + str(key) + ' fortnights: ' + str(
value) + ' job in Entry Queue\n'
print
self.output += '\n'
for key, value in self.memoryRatio.iteritems():
# print '=> at t = ',key, ' fortnights: %4.2f percent of memory in use. (main partition: OS excluded)' % ((float(value) /( self.space - self.os )) * 100)
self.output += str(
'=> at t = ' + str(key) +
' fortnights: %4.2f percent of memory in use. (main partition: OS excluded)\n'
% ((float(value) / (self.space - self.os)) * 100))
print
self.output += '\n'
for key, value in self.fragmentation.iteritems():
# print '=> at t = ',key, ' fortnights: \n\t- ', value[0], ' number of unused memory\n\t- ', value[1], 'k average size \n'
self.output += '=> at t = ' + str(
key) + ' fortnights: \n\t- ' + str(
value[0]) + ' number of unused memory\n\t- ' + str(
value[1]) + 'k average size \n'
class ReadData():
'''
class used to read text file containing data
'''
def __init__(self, filename = "test_jobs.txt"):
'''
Constructor
'''
self.filename = filename
self.entryQueue = MyQueue()
'''
Check if file exists or not
'''
def fileExists(self, filename):
try:
f = open(filename)
f.close()
return True
except IOError:
return False
'''
Read data from text file and store it in an instance of my Custom Queue
Return Custom Queue object
'''
def readDataFile(self, filename):
if (self.fileExists(filename)):
try:
f = open(filename, "r")
line = f.readline()
while line != '':
line = line.strip()
# for debugging purpose
# print line
# case : if blank line
if (len(line) == 0):
line = f.readline()
continue
# case : if comment line
if (line[0] == '#'):
line = f.readline()
continue
# case : if data line
jobProcess = line.split()
if (len(jobProcess) > 3):
self.entryQueue.enqueue(jobProcess[0], jobProcess[1], jobProcess[2])
# for debugging purpose
# print jobProcess
line = f.readline()
f.close()
except IOError:
return "Cannot open File..."
return "File is not found..."
def __init__(self, filename = "test_jobs.txt"):
'''
Constructor
'''
self.filename = filename
self.entryQueue = MyQueue()
class ReadData():
'''
class used to read text file containing data
'''
def __init__(self, filename="test_jobs.txt"):
'''
Constructor
'''
self.filename = filename
self.entryQueue = MyQueue()
'''
Check if file exists or not
'''
def fileExists(self, filename):
try:
f = open(filename)
f.close()
return True
except IOError:
return False
'''
Read data from text file and store it in an instance of my Custom Queue
Return Custom Queue object
'''
def readDataFile(self, filename):
if (self.fileExists(filename)):
try:
f = open(filename, "r")
line = f.readline()
while line != '':
line = line.strip()
# for debugging purpose
# print line
# case : if blank line
if (len(line) == 0):
line = f.readline()
continue
# case : if comment line
if (line[0] == '#'):
line = f.readline()
continue
# case : if data line
jobProcess = line.split()
if (len(jobProcess) > 3):
self.entryQueue.enqueue(jobProcess[0], jobProcess[1],
jobProcess[2])
# for debugging purpose
# print jobProcess
line = f.readline()
f.close()
except IOError:
return "Cannot open File..."
return "File is not found..."
def __init__(self, filename="test_jobs.txt"):
'''
Constructor
'''
self.filename = filename
self.entryQueue = MyQueue()