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Make ObjectPublishers even lighter by lazy-loading observers

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John Estropia
2019-10-25 19:16:38 +09:00
parent f3beca8769
commit 998938490c
3 changed files with 49 additions and 26 deletions
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41
Sources/ObjectPublisher.swift
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@@ -195,6 +195,7 @@ public final class ObjectPublisher<O: DynamicObject>: ObjectRepresentation, Hash
deinit {
self.context.objectsDidChangeObserver(remove: self)
self.observers.removeAllObjects()
}
@@ -221,30 +222,36 @@ public final class ObjectPublisher<O: DynamicObject>: ObjectRepresentation, Hash
self.rawObjectWillChange = nil
}
self.$lazySnapshot.initialize({ initializer(objectID, context) })
context.objectsDidChangeObserver(for: self).addObserver(self) { [weak self] (updatedIDs, deletedIDs) in
self.$lazySnapshot.initialize { [weak self] in
guard let self = self else {
return
return initializer(objectID, context)
}
if deletedIDs.contains(objectID) {
context.objectsDidChangeObserver(for: self).addObserver(self) { [weak self] (updatedIDs, deletedIDs) in
self.object = nil
guard let self = self else {
self.willChange()
self.$lazySnapshot.reset({ nil })
self.didChange()
self.notifyObservers()
}
else if updatedIDs.contains(objectID) {
self.willChange()
self.$lazySnapshot.reset({ initializer(objectID, context) })
self.didChange()
self.notifyObservers()
return
}
if deletedIDs.contains(objectID) {
self.object = nil
self.willChange()
self.$lazySnapshot.reset({ nil })
self.didChange()
self.notifyObservers()
}
else if updatedIDs.contains(objectID) {
self.willChange()
self.$lazySnapshot.reset({ initializer(objectID, context) })
self.didChange()
self.notifyObservers()
}
}
return initializer(objectID, context)
}
}