| import simpy |
| import numpy as np |
| from math import exp |
|
|
| class RetryDelay(simpy.Resource): |
| """ |
| This class represents the human operator retry delay type of fault. |
| Simulated RetryDelay faults only apply to BowlFeeders. |
| """ |
| def __init__(self, env, module, debug=True): |
| super(RetryDelay, self).__init__(env) |
| self.debug = debug |
| self.t = 0 |
| self.env = env |
| self.module = module |
|
|
| def process(self): |
| with self.request() as req: |
| yield req |
| self.t = self.t + 1 |
| |
| |
| delay_factor = np.random.poisson((exp(self.t/5)-1)/4) * 0.2 |
| if self.debug: |
| print("FAULT: RETRY_DELAY: ", delay_factor) |
| yield self.env.timeout(self.add_delay(self.module.duration, delay_factor), 1) |
| return |
|
|
| def add_delay(self, delay, delay_factor): |
| return delay * delay_factor |
|
|
| def spawn(self): |
| return self.env.process(self.process()) |
|
|
