26 lines
869 B
GDScript
26 lines
869 B
GDScript
class_name ObserverBase
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## Interface of an observer
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##
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## All communication in GDRx is handled asynchronously via observable data
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## streams, so-called [Observable]s. An [Observer] can subscribe to an
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## [Observable] to receive emitted items sent on the stream.
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## Create a new subscription via [method ObservableBase.subscribe].
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## An [Observer] needs to abide by the Observer-Observable-Contract as defined
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## in this interface.
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##
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## Notifications are [method on_next], [method on_error] and
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## [method on_completed].
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## Called when the [Observable] emits a new item on the stream
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func on_next(_i):
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NotImplementedError.raise()
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## Called when the [Observable] emits an error on the stream
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func on_error(_e):
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NotImplementedError.raise()
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## Called when the [Observable] is finished and no more items are sent.
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func on_completed():
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NotImplementedError.raise()
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