1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
#!/usr/bin/env python3
from enum import Enum
class Elevator:
def __init__(self, e_id, floor, goal):
self.id = e_id
self.floor = floor
self.goal = goal
def __repr__(self):
attrs = ', '.join('%s=%s' % t for t in self.__dict__.items())
return 'Elevator(%s)' % attrs
class Direction(Enum):
UP = 1
DOWN = 2
class ElevatorControlSystem:
def __init__(self, num_elevators):
self.elevators = {i: Elevator(i, 1, None) for i in range(num_elevators)}
self.pickup_requests = []
def pickup(self, floor, direction):
self.pickup_requests.append((floor, direction))
def dropoff(self, elevator_id, floor):
self.elevators[elevator_id].goal = floor
def step(self):
# serve pickup requests
free_elevators = list(filter(lambda e: e.goal is None, self.elevators.values()))
if free_elevators:
for floor, direction in self.pickup_requests:
elevator = min(free_elevators, key=lambda e: abs(e.floor - floor))
elevator.goal = floor
# move elevators to requested floors
for elevator in self.elevators.values():
if elevator.goal is not None:
if elevator.goal > elevator.floor:
elevator.floor += 1
elif elevator.goal < elevator.floor:
elevator.floor -= 1
# check goal after moving
if elevator.goal == elevator.floor:
elevator.goal = None
if __name__ == '__main__':
ecs = ElevatorControlSystem(1)
print(ecs.elevators)
print('requesting pickup on floor 2 down')
ecs.pickup(2, Direction.DOWN)
ecs.step()
print(ecs.elevators)
print('requesting dropoff on floor 1')
ecs.dropoff(0, 1)
ecs.step()
print(ecs.elevators)
|
