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
|
from abc import abstractmethod
from typing import Optional, TypeVar, Union
from .disposable import DisposableBase
from .observable import ObservableBase
from .observer import ObserverBase, OnCompleted, OnError, OnNext
from .scheduler import SchedulerBase
_T = TypeVar("_T")
class SubjectBase(ObserverBase[_T], ObservableBase[_T]):
"""Subject abstract base class.
Represents an object that is both an observable sequence as well
as an observer.
"""
__slots__ = ()
@abstractmethod
def subscribe(
self,
on_next: Optional[Union[OnNext[_T], ObserverBase[_T]]] = None,
on_error: Optional[OnError] = None,
on_completed: Optional[OnCompleted] = None,
*,
scheduler: Optional[SchedulerBase] = None,
) -> DisposableBase:
"""Subscribe an observer to the observable sequence.
Args:
observer: [Optional] The object that is to receive
notifications.
scheduler: [Optional] The default scheduler to use for this
subscription.
Returns:
Disposable object representing an observer's subscription
to the observable sequence.
"""
raise NotImplementedError
@abstractmethod
def on_next(self, value: _T) -> None:
"""Notifies the observer of a new element in the sequence.
Args:
value: The received element.
"""
raise NotImplementedError
@abstractmethod
def on_error(self, error: Exception) -> None:
"""Notifies the observer that an exception has occurred.
Args:
error: The error that has occurred.
"""
raise NotImplementedError
@abstractmethod
def on_completed(self) -> None:
"""Notifies the observer of the end of the sequence."""
raise NotImplementedError
__all__ = ["SubjectBase"]
|
