""" bank21: One counter with impatient customers """
from SimPy.Simulation import *
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,))
            activate(c,c.visit(timeInBank=15.0))
            t = expovariate(1.0/interval)
            yield hold,self,t

class Customer(Process):
    """ Customer arrives, is served and  leaves """
        
    def visit(self,timeInBank=0):       
        arrive = now()       # arrival time                     
        print "%8.3f %s: Here I am     "%(now(),self.name)

        yield (request,self,counter),(hold,self,maxWaitTime)    
        wait = now()-arrive  # waiting time                     
        if self.acquired(counter):                              
            print "%8.3f %s: Waited %6.3f"%(now(),self.name,wait)
            yield hold,self,timeInBank
            yield release,self,counter                          
            print "%8.3f %s: Completed"%(now(),self.name)
        else:
            print "%8.3f %s: Waited %6.3f. I am off"%(now(),self.name,wait)
        
## Experiment data -------------------------

maxTime = 400.0  # minutes                                 
maxWaitTime = 12.0 # minutes. maximum time to wait              

## Model  ----------------------------------

def model():                                                    
    global counter                                              
    seed(98989)
    counter = Resource(name="Karen")                            
    initialize()
    source = Source('Source')
    activate(source,
             source.generate(number=5, interval=10.0),at=0.0)   
    simulate(until=maxTime)                                     

## Experiment  ----------------------------------

model()
