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""" bank21: One counter with impatient customers """
from SimPy.Simulation import *
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))
activate(c, c.visit(timeInBank=15.0))
t = expovariate(1.0 / interval)
yield hold, self, t
class Customer(Process):
""" Customer arrives, is served and leaves """
def visit(self, timeInBank=0):
arrive = now() # arrival time
print("%8.3f %s: Here I am " % (now(), self.name))
yield (request, self, counter), (hold, self, maxWaitTime)
wait = now() - arrive # waiting time
if self.acquired(counter):
print("%8.3f %s: Waited %6.3f" % (now(), self.name, wait))
yield hold, self, timeInBank
yield release, self, counter
print("%8.3f %s: Completed" % (now(), self.name))
else:
print("%8.3f %s: Waited %6.3f. I am off" % (now(), self.name, wait))
## Experiment data -------------------------
maxTime = 400.0 # minutes
maxWaitTime = 12.0 # minutes. maximum time to wait
## Model ----------------------------------
def model():
global counter
seed(98989)
counter = Resource(name="Karen")
initialize()
source = Source('Source')
activate(source,
source.generate(number=5, interval=10.0), at=0.0)
simulate(until=maxTime)
## Experiment ----------------------------------
model()
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