"""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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