Python-сообщество

1 
2 """A counter with a random service time""" 
3 from SimPy.Simulation import * 
4 from random import expovariate, seed 
5 
6 class Source(Process): 
7     """ Source generates customers randomly""" 
8 
9     def generate(self,number,interval): 
10         for i in range(number): 
11             c = Customer(name = "Customer%02d"%(i,)) 
12             activate(c,c.visit(timeInBank=12.0)) 
13             t = expovariate(1.0/interval) 
14             yield hold,self,t 
15 
16 class Customer(Process): 
17     """ Customer arrives, is served and leaves """ 
18 
19     def visit(self,timeInBank=0): 
20         arrive=now() 
21         print "%7.4f %s: Here I am     "%(now(),self.name) 
22         yield request,self,counter 
23         wait=now()-arrive 
24         print "%7.4f %s: Waited %6.3f"%(now(),self.name,wait) 
25         tib = expovariate(1.0/timeInBank) 
26         yield hold,self,tib 
27         yield release,self,counter 
28         print "%7.4f %s: Finished      "%(now(),self.name) 
29 
30 def model(theseed): 
31     global counter 
32     seed(theseed) 
33     counter = Resource(name="Karen") 
34 
35     initialize() 
36     source = Source(’Source’) 
37     activate(source,source.generate(5,interval=10.0),0.0) 
38     simulate(until=400.0) 
39 
40 model(theseed=12345)