class CounterSim(object):
'''
CounterSim is the real driver for the DES simulation.
The info 1. is an OrderedSet Whose Elements are CounterEvents
2. and also a Virtual Time Keeper initially at 0.0
'''
#Constructor
def __init__(self):
'''
pre: None
post: An initial empty OrderedSet (the collection of CounterEvents later)
'''
#Construct the Empty CounterSim Object
#Initialize the virtual time
self.event = OrderedSet()
self.t = 0.0
#Current time method
def now(self):
'''
pre:None
post:return the current virtual time
'''
return self.t
#Insertion Method
def insert(self,x):
'''
pre: X is a CounterEvent Ojbect
post: insert the CounterEvent to the event Collection(OrderedSet)
exception:TypeErro if x is not CounterEvent Object
'''
#raise typeError if x not the right Type
if not isinstance(x,CounterEvent):
raise TypeError
#insert if right type
self.event.insert(x)
#Setup Method
def setup (self, t=0):
'''
pre: t is a numeric Type
post: 1. construct COunterEvent with time t ( 0.0 if t not inptued)
2. The constructed CounterEvent is inserted to the event collection (OrderedSet)
Exception:TypeError if t is not a numeric type
'''
#raise typeError if x not the right Type
if not (isinstance(t,int) or isinstance(t,float)):
raise TypeError
#Construct and insert the CounterEvent Object with t
self.insert(CounterEvent(t))
# the simulation Engine method
def doAllEvents(self):
'''
pre:None
post:THe SImulator has porperly run
'''
#The main loop for carrying out DES
#going through the Events collection
#applying right method to it
while len(self.event) > 0:
event = self.event.removeFirst()
self.t = event.time()
event.execute(self)
#the getset method to get the ordered set (events collection in the simulator)
def getset(self):
'''
pre:None
post: the orderedSet (events collection) is returned
'''
return self.event
