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""" bank08: A counter with a random service time """
from SimPy.Simulation import *
from random import expovariate, seed
## Model components ------------------------
class Source(Process):
""" Source generates customers randomly """
def generate(self, number, meanTBA, resource):
for i in range(number):
c = Customer(name="Customer%02d" % (i,))
activate(c, c.visit(b=resource))
t = expovariate(1.0 / meanTBA)
yield hold, self, t
class Customer(Process):
""" Customer arrives, is served and leaves """
def visit(self, b):
arrive = now()
print("%8.4f %s: Here I am " % (now(), self.name))
yield request, self, b
wait = now() - arrive
print("%8.4f %s: Waited %6.3f" % (now(), self.name, wait))
tib = expovariate(1.0 / timeInBank) # (1)
yield hold, self, tib # (2)
yield release, self, b
print("%8.4f %s: Finished " % (now(), self.name))
## Experiment data -------------------------
maxNumber = 5 # (3)
maxTime = 400.0 # minutes
timeInBank = 12.0 # mean, minutes
ARRint = 10.0 # mean, minutes
theseed = 99999 # (4)
## Model/Experiment ------------------------------
seed(theseed)
k = Resource(name="Counter", unitName="Clerk")
initialize()
s = Source('Source')
activate(s, s.generate(number=maxNumber, meanTBA=ARRint,
resource=k), at=0.0)
simulate(until=maxTime)
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