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""" bank21_OO: One counter with impatient customers """
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, interval):
for i in range(number):
c = Customer(name="Customer%02d" % (i), sim=self.sim)
self.sim.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 = self.sim.now() # arrival time
print("%8.3f %s: Here I am " % (self.sim.now(), self.name))
yield (request, self, self.sim.counter), (hold, self, maxWaitTime)
wait = self.sim.now() - arrive # waiting time
if self.acquired(self.sim.counter):
print("%8.3f %s: Waited %6.3f" % (self.sim.now(), self.name, wait))
yield hold, self, timeInBank
yield release, self, self.sim.counter
print("%8.3f %s: Completed" % (self.sim.now(), self.name))
else:
print("%8.3f %s: Waited %6.3f. I am off" % (self.sim.now(), self.name, wait))
## Model ----------------------------------
class BankModel(Simulation):
def run(self, aseed):
""" PEM """
seed(aseed)
self.counter = Resource(name="Karen", sim=self)
source = Source('Source', sim=self)
self.activate(source,
source.generate(number=5, interval=10.0), at=0.0)
self.simulate(until=maxTime)
## Experiment data -------------------------
maxTime = 400.0 # minutes
maxWaitTime = 12.0 # minutes. maximum time to wait
seedVal = 98989
## Experiment ----------------------------------
mymodel = BankModel()
mymodel.run(aseed=seedVal)
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