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""" bank23_OO: One counter with a priority customer with preemption """
from SimPy.Simulation import Simulation, Process, Resource, PriorityQ, 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=12.0, P=0))
t = expovariate(1.0 / interval)
yield hold, self, t
class Customer(Process):
""" Customer arrives, is served and leaves """
def visit(self, timeInBank=0, P=0):
arrive = self.sim.now() # arrival time
Nwaiting = len(self.sim.k.waitQ)
print("%8.3f %s: Queue is %d on arrival" % (self.sim.now(), self.name, Nwaiting))
yield request, self, self.sim.k, P
wait = self.sim.now() - arrive # waiting time
print("%8.3f %s: Waited %6.3f" % (self.sim.now(), self.name, wait))
yield hold, self, timeInBank
yield release, self, self.sim.k
print("%8.3f %s: Completed" % (self.sim.now(), self.name))
## Model -----------------------------------
class BankModel(Simulation):
def run(self, aseed):
""" PEM """
seed(aseed)
self.k = Resource(name="Counter", unitName="Karen",
qType=PriorityQ, preemptable=True, sim=self)
s = Source('Source', sim=self)
self.activate(s, s.generate(number=5, interval=10.0), at=0.0)
guido = Customer(name="Guido ", sim=self)
self.activate(guido, guido.visit(timeInBank=12.0, P=100), at=23.0)
self.simulate(until=maxTime)
## Experiment data -------------------------
maxTime = 400.0 # minutes
seedVal = 98989
## Experiment -------- ---------------------
mymodel = BankModel()
mymodel.run(aseed=seedVal)
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