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""" bank09_OO: Several Counters but a Single Queue """
from SimPy.Simulation import Simulation, Process, Resource, hold, request, release
from random import expovariate, seed
## Model components ------------------------
class Source(Process):
""" Source generates customers randomly """
def generate(self, number, meanTBA):
for i in range(number):
c = Customer(name="Customer%02d" % (i), sim=self.sim)
self.sim.activate(c, c.visit(b=self.sim.k))
t = expovariate(1.0 / meanTBA)
yield hold, self, t
class Customer(Process):
""" Customer arrives, is served and leaves """
def visit(self, b):
arrive = self.sim.now()
print("%8.4f %s: Here I am " % (self.sim.now(), self.name))
yield request, self, b
wait = self.sim.now() - arrive
print("%8.4f %s: Waited %6.3f" % (self.sim.now(), self.name, wait))
tib = expovariate(1.0 / timeInBank)
yield hold, self, tib
yield release, self, b
print("%8.4f %s: Finished " % (self.sim.now(), self.name))
## Model -----------------------------------
class BankModel(Simulation):
def run(self, aseed):
""" PEM """
seed(aseed)
self.k = Resource(capacity=Nc, name="Counter", unitName="Clerk",
sim=self)
s = Source('Source', sim=self)
self.activate(s, s.generate(number=maxNumber, meanTBA=ARRint), at=0.0)
self.simulate(until=maxTime)
## Experiment data -------------------------
maxNumber = 5 # of customers
maxTime = 400.0 # minutes
timeInBank = 12.0 # mean, minutes
ARRint = 10.0 # mean, minutes
Nc = 2 # of clerks/counters
seedVal = 99999
## Experiment ------------------------------
mymodel = BankModel()
mymodel.run(aseed=seedVal)
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