""" bank11: The bank with a Monitor"""
from SimPy.Simulation import *                          
from random import expovariate,seed

## Model components ------------------------

class Source(Process):
    """ Source generates customers randomly"""

    def generate(self,number,interval,resource):       
        for i in range(number):
            c = Customer(name = "Customer%02d"%(i,),sim=self.sim)
            self.sim.activate(c,c.visit(b=resource))
            t = expovariate(1.0/interval)
            yield hold,self,t

class Customer(Process):
    """ Customer arrives, is served and leaves """
        
    def visit(self,b):       
        arrive = self.sim.now()
        yield request,self,b
        wait = self.sim.now()-arrive                       
        self.sim.wM.observe(wait)                        
        tib = expovariate(1.0/timeInBank)
        yield hold,self,tib
        yield release,self,b

## Experiment data -------------------------

maxNumber = 50
maxTime = 1000.0 # minutes                                      
timeInBank = 12.0  # mean, minutes                          
ARRint = 10.0    # mean, minutes                          
Nc = 2           # number of counters
theseed = 12345                                            
                                     
## Model -----------------------------------
class BankModel(Simulation):
    def run(self):
        self.initialize() 
        k = Resource(capacity=Nc,name="Clerk",sim=self)                     
        self.wM = Monitor(sim=self)                                         
        s = Source('Source',sim=self)
        self.activate(s,s.generate(number=maxNumber,interval=ARRint,   
                      resource=k),at=0.0)
        self.simulate(until=maxTime)                                    
## Experiment   -----------------------------
seed(theseed)
experi=BankModel()
experi.run()

## Result  ----------------------------------

result = experi.wM.count(),experi.wM.mean()                             
print "Average wait for %3d completions was %5.3f minutes."% result 
