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233 lines
8.4 KiB
Python
233 lines
8.4 KiB
Python
"""
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This is an example of a simplified city, where there are Passengers and Drivers that can take those passengers
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from their location to their desired location.
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An example scenario could play like the following:
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- Drivers start in the `wandering` state, where they wander around the city until they have been assigned a journey
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- Passenger(1) tells every driver that it wants to request a Journey.
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- Each driver receives the request.
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If Driver(2) is interested in providing the Journey, it asks Passenger(1) to confirm that it accepts Driver(2)'s request
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- When Passenger(1) accepts the request, two things happen:
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- Passenger(1) changes its state to `driving_home`
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- Driver(2) starts moving towards the origin of the Journey
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- Once Driver(2) reaches the origin, it starts moving itself and Passenger(1) to the destination of the Journey
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- When Driver(2) reaches the destination (carrying Passenger(1) along):
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- Driver(2) starts wondering again
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- Passenger(1) dies, and is removed from the simulation
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- If there are no more passengers available in the simulation, Drivers die
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"""
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from __future__ import annotations
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from typing import Optional
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from soil import *
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from soil import events
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from mesa.space import MultiGrid
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# More complex scenarios may use more than one type of message between objects.
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# A common pattern is to use `enum.Enum` to represent state changes in a request.
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@dataclass
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class Journey:
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"""
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This represents a request for a journey. Passengers and drivers exchange this object.
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A journey may have a driver assigned or not. If the driver has not been assigned, this
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object is considered a "request for a journey".
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"""
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origin: (int, int)
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destination: (int, int)
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tip: float
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passenger: Passenger
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driver: Optional[Driver] = None
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class City(EventedEnvironment):
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"""
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An environment with a grid where drivers and passengers will be placed.
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The number of drivers and riders is configurable through its parameters:
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:param str n_cars: The total number of drivers to add
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:param str n_passengers: The number of passengers in the simulation
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:param list agents: Specific agents to use in the simulation. It overrides the `n_passengers`
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and `n_cars` params.
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:param int height: Height of the internal grid
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:param int width: Width of the internal grid
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"""
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n_cars = 1
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n_passengers = 10
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height = 100
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width = 100
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def init(self):
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self.grid = MultiGrid(width=self.width, height=self.height, torus=False)
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if not self.agents:
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self.add_agents(Driver, k=self.n_cars)
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self.add_agents(Passenger, k=self.n_passengers)
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for agent in self.agents:
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self.grid.place_agent(agent, (0, 0))
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self.grid.move_to_empty(agent)
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self.total_earnings = 0
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self.add_model_reporter("total_earnings")
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@report
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@property
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def number_passengers(self):
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return self.count_agents(agent_class=Passenger)
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class Driver(Evented, FSM):
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pos = None
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journey = None
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earnings = 0
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def on_receive(self, msg, sender):
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"""This is not a state. It will run (and block) every time process_messages is invoked"""
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if self.journey is None and isinstance(msg, Journey) and msg.driver is None:
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msg.driver = self
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self.journey = msg
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def check_passengers(self):
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"""If there are no more passengers, stop forever"""
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c = self.count_agents(agent_class=Passenger)
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self.debug(f"Passengers left {c}")
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return c
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@state(default=True)
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async def wandering(self):
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"""Move around the city until a journey is accepted"""
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target = None
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if not self.check_passengers():
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return self.die("No passengers left")
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self.journey = None
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while self.journey is None: # No potential journeys detected (see on_receive)
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if target is None or not self.move_towards(target):
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target = self.random.choice(
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self.model.grid.get_neighborhood(self.pos, moore=False)
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)
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if not self.check_passengers():
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return self.die("No passengers left")
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# This will call on_receive behind the scenes, and the agent's status will be updated
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self.process_messages()
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await self.delay(30) # Wait at least 30 seconds before checking again
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try:
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# Re-send the journey to the passenger, to confirm that we have been selected
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self.journey = await self.journey.passenger.ask(self.journey, timeout=60, delay=5)
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except events.TimedOut:
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# No journey has been accepted. Try again
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self.journey = None
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return
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return self.driving
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@state
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async def driving(self):
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"""The journey has been accepted. Pick them up and take them to their destination"""
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self.info(f"Driving towards Passenger {self.journey.passenger.unique_id}")
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while self.move_towards(self.journey.origin):
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await self.delay()
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self.info(f"Driving {self.journey.passenger.unique_id} from {self.journey.origin} to {self.journey.destination}")
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while self.move_towards(self.journey.destination, with_passenger=True):
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await self.delay()
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self.info("Arrived at destination")
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self.earnings += self.journey.tip
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self.model.total_earnings += self.journey.tip
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if not self.check_passengers():
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return self.die("No passengers left")
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return self.wandering
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def move_towards(self, target, with_passenger=False):
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"""Move one cell at a time towards a target"""
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self.debug(f"Moving { self.pos } -> { target }")
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if target[0] == self.pos[0] and target[1] == self.pos[1]:
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return False
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next_pos = [self.pos[0], self.pos[1]]
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for idx in [0, 1]:
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if self.pos[idx] < target[idx]:
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next_pos[idx] += 1
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break
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if self.pos[idx] > target[idx]:
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next_pos[idx] -= 1
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break
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self.model.grid.move_agent(self, tuple(next_pos))
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if with_passenger:
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self.journey.passenger.pos = (
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self.pos
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) # This could be communicated through messages
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return True
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class Passenger(Evented, FSM):
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pos = None
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def on_receive(self, msg, sender):
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"""This is not a state. It will be run synchronously every time `process_messages` is run"""
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if isinstance(msg, Journey):
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self.journey = msg
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return msg
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@default_state
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@state
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async def asking(self):
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destination = (
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self.random.randint(0, self.model.grid.height-1),
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self.random.randint(0, self.model.grid.width-1),
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)
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self.journey = None
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journey = Journey(
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origin=self.pos,
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destination=destination,
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tip=self.random.randint(10, 100),
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passenger=self,
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)
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timeout = 60
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expiration = self.now + timeout
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self.info(f"Asking for journey at: { self.pos }")
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self.model.broadcast(journey, ttl=timeout, sender=self, agent_class=Driver)
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while not self.journey:
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self.debug(f"Waiting for responses at: { self.pos }")
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try:
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# This will call process_messages behind the scenes, and the agent's status will be updated
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# If you want to avoid that, you can call it with: check=False
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await self.received(expiration=expiration, delay=10)
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except events.TimedOut:
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self.info(f"Still no response. Waiting at: { self.pos }")
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self.model.broadcast(
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journey, ttl=timeout, sender=self, agent_class=Driver
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)
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expiration = self.now + timeout
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self.info(f"Got a response! Waiting for driver")
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return self.driving_home
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@state
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async def driving_home(self):
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while (
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self.pos[0] != self.journey.destination[0]
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or self.pos[1] != self.journey.destination[1]
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):
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try:
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await self.received(timeout=60)
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except events.TimedOut:
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pass
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self.die("Got home safe!")
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simulation = Simulation(name="RideHailing",
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model=City,
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seed="carsSeed",
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max_time=1000,
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parameters=dict(n_passengers=2))
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if __name__ == "__main__":
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easy(simulation)
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