""" bank23_OO: One counter with a priority customer with preemption """
from SimPy.Simulation import *
from random import expovariate,seed
## Model components ------------------------
class Source(Process):
""" Source generates customers randomly """
def generate(self,number,interval,resource):
for i in range(number):
c = Customer(name = "Customer%02d"%(i,),sim=self.sim)
self.sim.activate(c,c.visit(timeInBank=12.0,
res=resource,P=0))
t = expovariate(1.0/interval)
yield hold,self,t
class Customer(Process):
""" Customer arrives, is served and leaves """
def visit(self,timeInBank=0,res=None,P=0):
arrive = self.sim.now() # arrival time
Nwaiting = len(res.waitQ)
print "%8.3f %s: Queue is %d on arrival"%(self.sim.now(),self.name,Nwaiting)
yield request,self,res,P
wait = self.sim.now()-arrive # waiting time
print "%8.3f %s: Waited %6.3f"%(self.sim.now(),self.name,wait)
yield hold,self,timeInBank
yield release,self,res
print "%8.3f %s: Completed"%(self.sim.now(),self.name)
## Experiment data -------------------------
maxTime = 400.0 # minutes
## Model -----------------------------------
class BankModel(Simulation):
def run(self):
self.initialize()
k = Resource(name="Counter",unitName="Karen",
qType=PriorityQ, preemptable=True,sim=self)
s = Source('Source',sim=self)
self.activate(s,s.generate(number=5, interval=10.0,
resource=k),at=0.0)
guido = Customer(name="Guido ",sim=self)
self.activate(guido,guido.visit(timeInBank=12.0,res=k,
P=100),at=23.0)
self.simulate(until=maxTime)
## Experiment ------------------------------
seed(98989)
BankModel().run()
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