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""" bank12_OO: Multiple runs of the bank with a Monitor"""
from SimPy.Simulation import Simulation, Process, Resource, Monitor, hold,\
request, release
from random import expovariate, seed
## Model components ------------------------
class Source(Process):
""" Source generates customers randomly"""
def generate(self, number, interval):
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 / interval)
yield hold, self, t
class Customer(Process):
""" Customer arrives, is served and leaves """
def visit(self, b):
arrive = self.sim.now()
yield request, self, b
wait = self.sim.now() - arrive
self.sim.wM.observe(wait)
tib = expovariate(1.0 / timeInBank)
yield hold, self, tib
yield release, self, b
## Model ----------------------------------
class BankModel(Simulation):
def run(self, aseed):
self.initialize()
seed(aseed)
self.k = Resource(capacity=Nc, name="Clerk", sim=self)
self.wM = Monitor(sim=self)
s = Source('Source', sim=self)
self.activate(s, s.generate(number=maxNumber, interval=ARRint), at=0.0)
self.simulate(until=maxTime)
return (self.wM.count(), self.wM.mean())
## Experiment data -------------------------
maxNumber = 50
maxTime = 2000.0 # minutes
timeInBank = 12.0 # mean, minutes
ARRint = 10.0 # mean, minutes
Nc = 2 # number of counters
seedVals = [393939, 31555999, 777999555, 319999771]
## Experiment/Result ----------------------------------
mymodel = BankModel()
for Sd in seedVals:
mymodel.run(aseed=Sd)
moni = mymodel.wM
print("Average wait for %3d completions was %6.2f minutes." % (moni.count(), moni.mean()))
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