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from SimPy.Simulation import *
import random
"""
needResources.py
Demo of waitUntil capability.
Scenario:
Three workers require sets of tools to do their jobs. Tools are shared, scarce
resources for which they compete.
"""
## Model components ------------------------
class Worker(Process):
def work(self,heNeeds=[]):
def workerNeeds():
for item in heNeeds:
if item.n==0:
return False
return True
while self.sim.now()<8*60:
yield waituntil,self,workerNeeds
for item in heNeeds:
yield request,self,item
print "%s %s has %s and starts job" %(self.sim.now(),self.name,
[x.name for x in heNeeds])
yield hold,self,random.uniform(10,30)
for item in heNeeds:
yield release,self,item
yield hold,self,2 #rest
## Model -----------------------------------
class NeedResourcesModel(Simulation):
def run(self):
print 'needResources'
self.initialize()
brush=Resource(capacity=1,name="brush",sim=self)
ladder=Resource(capacity=2,name="ladder",sim=self)
hammer=Resource(capacity=1,name="hammer",sim=self)
saw=Resource(capacity=1,name="saw",sim=self)
painter=Worker("painter",sim=self)
self.activate(painter,painter.work([brush,ladder]))
roofer=Worker("roofer",sim=self)
self.activate(roofer,roofer.work([hammer,ladder,ladder]))
treeguy=Worker("treeguy",sim=self)
self.activate(treeguy,treeguy.work([saw,ladder]))
print self.simulate(until=9*60)
## Experiment data -------------------------
SEED = 111333555
## Experiment ------------------------------
random.seed(SEED)
NeedResourcesModel().run()
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