84 lines
2.0 KiB
GDScript3
84 lines
2.0 KiB
GDScript3
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extends Subject
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class_name AsyncSubject
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## Represents the result of an asynchronous operation.
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##
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## The last value before the close notification, or the error received through
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## [i]on_error[/i], is sent to all subscribed observers.
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var value
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var has_value : bool
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## Creates a subject that can only receive one value and that value is
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## cached for all future observations.
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func _init():
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super._init()
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self.value = null
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self.has_value = false
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func _subscribe_core(
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observer : ObserverBase,
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_scheduler : SchedulerBase = null,
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) -> DisposableBase:
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if true:
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var __ = LockGuard.new(self.lock)
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if not check_disposed(): return Disposable.new()
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if not self.is_stopped:
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self.observers.append(observer)
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return InnerSubscription.new(self, observer)
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var err = self.error_value
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var has_value_ = self.has_value
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var value_ = self.value
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if err != null:
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observer.on_error(err)
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elif has_value_:
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observer.on_next(value_)
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observer.on_completed()
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else:
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observer.on_completed()
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return Disposable.new()
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## Remember the value. Upon completion, the most recently received value
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## will be passed on to all subscribed observers.
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## [br][br]
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## [b]Args:[/b]
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## [br]
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## [code]value[/code] The value to remember until completion
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func _on_next_core(i):
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var __ = LockGuard.new(self.lock)
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self.value = i
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self.has_value = true
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## Notifies all subscribed observers of the end of the sequence. The
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## most recently received value, if any, will now be passed on to all
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## subscribed observers.
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func _on_completed_core():
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var observers_
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var has_value_
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var value_
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if true:
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var __ = LockGuard.new(self.lock)
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observers_ = self.observers.duplicate()
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self.observers.clear()
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value_ = self.value
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has_value_ = self.has_value
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if has_value_:
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for o in observers_:
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o.on_next(value_)
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o.on_completed()
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else:
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for o in observers_:
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o.on_completed()
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## Unsubscribe all observers and release resources.
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func dispose():
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var __ = LockGuard.new(self.lock)
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self.value = null
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super.dispose()
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