"""bank17: Plotting a Histogram of Monitor results"""
from SimPy.Simulation  import *
from SimPy.SimPlot import *                                   
from random import *

class Source(Process):                                        
    """ Source generates customers randomly"""
    def generate(self,number,rate):       
        for i in range(number):
            c = Customer(name = "Customer%02d"%(i,))
            activate(c,c.visit(timeInBank=12.0))
            yield hold,self,expovariate(rate)

class Customer(Process):                                      
    """ Customer arrives, is served and leaves """
    def visit(self,timeInBank):       
        arrive=now()                                         
        #print "%8.4f %s: Arrived     "%(now(),self.name)

        yield request,self,counter
        #print "%8.4f %s: Got counter "%(now(),self.name)
        tib = expovariate(1.0/timeInBank)
        yield hold,self,tib
        yield release,self,counter

        #print "%8.4f %s: Finished    "%(now(),self.name)
        t = now()-arrive                                      
        Mon.observe(t)                                        

counter = Resource(1,name="Clerk")                           
Mon=Monitor('Time in the Bank')                                
N = 0
def model(SEED=393939):                                       
    seed(SEED)

    initialize()
    source = Source()                                                         
    activate(source,source.generate(number=20,rate=0.1),0.0)    
    simulate(until=400.0)                                      

model()                                                        
 
Histo = Mon.histogram(low=0.0,high=200.0,nbins=20)             

plt=SimPlot()                                                  
plt.plotHistogram(Histo,xlab='Time (min)',                       
                  title="Time in the Bank",
                  color="red",width=2)                         
plt.mainloop()