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216 lines
5.6 KiB
Python
216 lines
5.6 KiB
Python
from mesa.time import BaseScheduler
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from queue import Empty
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from heapq import heappush, heappop, heapify
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import math
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from inspect import getsource
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from numbers import Number
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from .utils import logger
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from mesa import Agent as MesaAgent
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INFINITY = float("inf")
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class DeadAgent(Exception):
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pass
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class When:
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def __init__(self, time):
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if isinstance(time, When):
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return time
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self._time = time
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def next(self, time):
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return self._time
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def abs(self, time):
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return self
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def __repr__(self):
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return str(f"When({self._time})")
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def __lt__(self, other):
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if isinstance(other, Number):
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return self._time < other
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return self._time < other.next(self._time)
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def __gt__(self, other):
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if isinstance(other, Number):
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return self._time > other
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return self._time > other.next(self._time)
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def ready(self, agent):
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return self._time <= agent.model.schedule.time
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def return_value(self, agent):
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return None
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class Cond(When):
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def __init__(self, func, delta=1, return_func=lambda agent: None):
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self._func = func
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self._delta = delta
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self._checked = False
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self._return_func = return_func
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def next(self, time):
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if self._checked:
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return time + self._delta
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return time
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def abs(self, time):
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return self
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def ready(self, agent):
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self._checked = True
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return self._func(agent)
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def return_value(self, agent):
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return self._return_func(agent)
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def __eq__(self, other):
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return False
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def __lt__(self, other):
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return True
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def __gt__(self, other):
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return False
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def __repr__(self):
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return str(f'Cond("{getsource(self._func)}")')
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NEVER = When(INFINITY)
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class Delta(When):
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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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if isinstance(other, Delta):
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return self._delta == other._delta
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return False
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def abs(self, time):
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return When(self._delta + time)
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def next(self, time):
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return time + self._delta
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def __repr__(self):
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return str(f"Delta({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__(*args, **kwargs)
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self._next = {}
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self._queue = []
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self.next_time = 0
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self.logger = logger.getChild(f"time_{ self.model }")
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def add(self, agent: MesaAgent, when=None):
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if when is None:
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when = When(self.time)
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elif not isinstance(when, When):
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when = When(when)
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if agent.unique_id in self._agents:
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del self._agents[agent.unique_id]
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if agent.unique_id in self._next:
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self._queue.remove((self._next[agent.unique_id], agent))
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heapify(self._queue)
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self._next[agent.unique_id] = when
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heappush(self._queue, (when, agent))
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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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self.logger.debug(f"Simulation step {self.time}")
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if not self.model.running:
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return
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when = NEVER
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to_process = []
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skipped = []
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next_time = INFINITY
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ix = 0
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self.logger.debug(f"Queue length: {len(self._queue)}")
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while self._queue:
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(when, agent) = self._queue[0]
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if when > self.time:
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break
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heappop(self._queue)
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if when.ready(agent):
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try:
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agent._last_return = when.return_value(agent)
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except Exception as ex:
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agent._last_except = ex
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self._next.pop(agent.unique_id, None)
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to_process.append(agent)
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continue
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next_time = min(next_time, when.next(self.time))
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self._next[agent.unique_id] = next_time
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skipped.append((when, agent))
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if self._queue:
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next_time = min(next_time, self._queue[0][0].next(self.time))
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self._queue = [*skipped, *self._queue]
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for agent in to_process:
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self.logger.debug(f"Stepping agent {agent}")
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try:
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returned = ((agent.step() or Delta(1))).abs(self.time)
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except DeadAgent:
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if agent.unique_id in self._next:
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del self._next[agent.unique_id]
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agent.alive = False
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continue
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if not getattr(agent, "alive", True):
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continue
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value = returned.next(self.time)
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agent._last_return = value
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if value < self.time:
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raise Exception(
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f"Cannot schedule an agent for a time in the past ({when} < {self.time})"
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)
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if value < INFINITY:
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next_time = min(value, next_time)
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self._next[agent.unique_id] = returned
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heappush(self._queue, (returned, agent))
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else:
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assert not self._next[agent.unique_id]
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self.steps += 1
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self.logger.debug(f"Updating time step: {self.time} -> {next_time}")
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self.time = next_time
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if not self._queue or next_time == INFINITY:
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self.model.running = False
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return self.time
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