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from abc import ABC, abstractmethod
from typing import Callable, Generic, Optional, TypeVar, Union
from .disposable import DisposableBase
from .observer import ObserverBase, OnCompleted, OnError, OnNext
from .scheduler import SchedulerBase
_T_out = TypeVar("_T_out", covariant=True)
class ObservableBase(Generic[_T_out], ABC):
"""Observable abstract base class.
Represents a push-style collection."""
__slots__ = ()
@abstractmethod
def subscribe(
self,
on_next: Optional[Union[OnNext[_T_out], ObserverBase[_T_out]]] = 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
Subscription = Callable[[ObserverBase[_T_out], Optional[SchedulerBase]], DisposableBase]
__all__ = ["ObservableBase", "Subscription"]
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