1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
from SimPy.Simulation import (Process, activate, hold, initialize, now,
reactivate, simulate)
class Bus(Process):
def operate(self, repairduration, triplength): # PEM
tripleft = triplength # time needed to finish trip
while tripleft > 0:
yield hold, self, tripleft # try to finish the trip
if self.interrupted(): # if another breakdown occurs
print('%s at %s' % (self.interruptCause.name, now()))
tripleft = self.interruptLeft # time to finish the trip
self.interruptReset() # end interrupt state
reactivate(br, delay=repairduration) # restart breakdown br
yield hold, self, repairduration # delay for repairs
print('Bus repaired at %s' % now())
else:
break # no more breakdowns, bus finished trip
print('Bus has arrived at %s' % now())
class Breakdown(Process):
def __init__(self, myBus):
Process.__init__(self, name='Breakdown ' + myBus.name)
self.bus = myBus
def breakBus(self, interval): # process execution method
while True:
yield hold, self, interval # breakdown interarrivals
if self.bus.terminated():
break
self.interrupt(self.bus) # breakdown to myBus
initialize()
b = Bus('Bus') # create a bus object
activate(b, b.operate(repairduration=20, triplength=1000))
br = Breakdown(b) # create breakdown br to bus b
activate(br, br.breakBus(300))
simulate(until=4000)
print('SimPy: No more events at time %s' % now())
|
