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Bank Renege.py
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Bank Renege.py
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"""
Bank renege example
Scenario:
A counter with a random service time and customers who renege. Based on the
program bank08.py from TheBank tutorial of SimPy 2. (KGM)
"""
import salabim as sim
NEW_CUSTOMERS = 5 # Total number of customers
INTERVAL_CUSTOMERS = 10.0 # Generate new customers roughly every x seconds
MIN_PATIENCE = 1 # Min. customer patience
MAX_PATIENCE = 3 # Max. customer patience
TIME_IN_BANK = 12
class Source(sim.Component):
"""Source generates customers randomly"""
def process(self):
for i in range(NEW_CUSTOMERS):
Customer()
yield self.hold(sim.Exponential(INTERVAL_CUSTOMERS).sample())
class Customer(sim.Component):
"""Customer arrives, is served and leaves."""
def process(self):
env.print_trace('', self.name(), 'arrrived')
patience = sim.Uniform(MIN_PATIENCE, MAX_PATIENCE).sample()
yield self.request(counter, fail_delay=patience)
wait = env.now() - self.creation_time()
if self.failed():
# We reneged
env.print_trace('', self.name(), 'RENEGED after {:6.3f}'.format(wait))
else:
# We got to the counter
env.print_trace('', self.name(), 'waited for {:6.3f}'.format(wait))
yield self.hold(sim.Exponential(TIME_IN_BANK).sample())
env.print_trace('', self.name(), 'finished')
# auto release counter
# Setup and start the simulation
env = sim.Environment(trace=True)
# Start processes and run
counter = sim.Resource(capacity=1)
Source()
env.run()