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76 lines
1.9 KiB
Python
76 lines
1.9 KiB
Python
from mesa.time import BaseScheduler
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from queue import Empty
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from heapq import heappush, heappop
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import math
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from .utils import logger
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from mesa import Agent
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INFINITY = float('inf')
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class When:
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def __init__(self, time):
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self._time = time
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def abs(self, time):
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return self._time
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class Delta:
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def __init__(self, delta):
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self._delta = delta
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def __eq__(self, other):
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return self._delta == other._delta
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def abs(self, time):
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return time + self._delta
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class TimedActivation(BaseScheduler):
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"""A scheduler which activates each agent when the agent requests.
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In each activation, each agent will update its 'next_time'.
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"""
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def __init__(self, *args, **kwargs):
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super().__init__(self)
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self._queue = []
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self.next_time = 0
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def add(self, agent: Agent):
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if agent.unique_id not in self._agents:
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heappush(self._queue, (self.time, agent.unique_id))
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super().add(agent)
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def step(self) -> None:
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"""
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Executes agents in order, one at a time. After each step,
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an agent will signal when it wants to be scheduled next.
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"""
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if self.next_time == INFINITY:
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return
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self.time = self.next_time
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when = self.time
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while self._queue and self._queue[0][0] == self.time:
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(when, agent_id) = heappop(self._queue)
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logger.debug(f'Stepping agent {agent_id}')
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when = (self._agents[agent_id].step() or Delta(1)).abs(self.time)
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if when < self.time:
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raise Exception("Cannot schedule an agent for a time in the past ({} < {})".format(when, self.time))
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heappush(self._queue, (when, agent_id))
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self.steps += 1
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if not self._queue:
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self.time = INFINITY
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self.next_time = INFINITY
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return
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self.next_time = self._queue[0][0]
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