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"""bank15: Monitoring a Resource"""
from SimPy.Simulation import *
from random import expovariate, seed
## Model components ------------------------
class Source(Process):
""" Source generates customers randomly"""
def generate(self, number, rate):
for i in range(number):
c = Customer(name="Customer%02d" % (i))
activate(c, c.visit(timeInBank=12.0))
yield hold, self, expovariate(rate)
class Customer(Process):
""" Customer arrives, is served and leaves """
def visit(self, timeInBank):
arrive = now()
print("%8.4f %s: Arrived " % (now(), self.name))
yield request, self, counter
print("%8.4f %s: Got counter " % (now(), self.name))
tib = expovariate(1.0 / timeInBank)
yield hold, self, tib
yield release, self, counter
print("%8.4f %s: Finished " % (now(), self.name))
## Experiment data -------------------------
maxTime = 400.0 # minutes
counter = Resource(1, name="Clerk", monitored=True)
## Model ----------------------------------
def model(SEED=393939):
seed(SEED)
initialize()
source = Source()
activate(source,
source.generate(number=5, rate=0.1), at=0.0)
simulate(until=maxTime)
return (counter.waitMon.timeAverage(), counter.actMon.timeAverage())
## Experiment ----------------------------------
print('Average waiting = %6.4f\nAverage active = %6.4f\n' % model())
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