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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
from threading import Lock, Timer
from typing import MutableMapping, Optional, TypeVar
from weakref import WeakKeyDictionary
from reactivex import abc, typing
from reactivex.disposable import (
CompositeDisposable,
Disposable,
SingleAssignmentDisposable,
)
from .periodicscheduler import PeriodicScheduler
_TState = TypeVar("_TState")
class TimeoutScheduler(PeriodicScheduler):
"""A scheduler that schedules work via a timed callback."""
_lock = Lock()
_global: MutableMapping[type, "TimeoutScheduler"] = WeakKeyDictionary()
@classmethod
def singleton(cls) -> "TimeoutScheduler":
with TimeoutScheduler._lock:
try:
self = TimeoutScheduler._global[cls]
except KeyError:
self = super().__new__(cls)
TimeoutScheduler._global[cls] = self
return self
def __new__(cls) -> "TimeoutScheduler":
return cls.singleton()
def schedule(
self, action: abc.ScheduledAction[_TState], state: Optional[_TState] = None
) -> abc.DisposableBase:
"""Schedules an action to be executed.
Args:
action: Action to be executed.
state: [Optional] state to be given to the action function.
Returns:
The disposable object used to cancel the scheduled action
(best effort).
"""
sad = SingleAssignmentDisposable()
def interval() -> None:
sad.disposable = self.invoke_action(action, state)
timer = Timer(0, interval)
timer.daemon = True
timer.start()
def dispose() -> None:
timer.cancel()
return CompositeDisposable(sad, Disposable(dispose))
def schedule_relative(
self,
duetime: typing.RelativeTime,
action: abc.ScheduledAction[_TState],
state: Optional[_TState] = None,
) -> abc.DisposableBase:
"""Schedules an action to be executed after duetime.
Args:
duetime: Relative time after which to execute the action.
action: Action to be executed.
state: [Optional] state to be given to the action function.
Returns:
The disposable object used to cancel the scheduled action
(best effort).
"""
seconds = self.to_seconds(duetime)
if seconds <= 0.0:
return self.schedule(action, state)
sad = SingleAssignmentDisposable()
def interval() -> None:
sad.disposable = self.invoke_action(action, state)
timer = Timer(seconds, interval)
timer.daemon = True
timer.start()
def dispose() -> None:
timer.cancel()
return CompositeDisposable(sad, Disposable(dispose))
def schedule_absolute(
self,
duetime: typing.AbsoluteTime,
action: abc.ScheduledAction[_TState],
state: Optional[_TState] = None,
) -> abc.DisposableBase:
"""Schedules an action to be executed at duetime.
Args:
duetime: Absolute time at which to execute the action.
action: Action to be executed.
state: [Optional] state to be given to the action function.
Returns:
The disposable object used to cancel the scheduled action
(best effort).
"""
duetime = self.to_datetime(duetime)
return self.schedule_relative(duetime - self.now, action, state)
__all__ = ["TimeoutScheduler"]
|
