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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| import Foundation | ||
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| public enum KeyChange<T> { | ||
| case edit(before: T?, after: T?) | ||
| case remove | ||
| } | ||
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| public final class KeyObservationRegistry<Storage: StorageAware> { | ||
| public typealias Observation = (Storage, KeyChange<Storage.T>) -> Void | ||
| private(set) var observations = [String: Observation]() | ||
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| @discardableResult | ||
| public func addObservation(_ observation: @escaping Observation, forKey key: String) -> ObservationToken { | ||
| observations[key] = observation | ||
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| return ObservationToken { [weak self] in | ||
| self?.observations.removeValue(forKey: key) | ||
| } | ||
| } | ||
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| public func removeObservation(forKey key: String) { | ||
| observations.removeValue(forKey: key) | ||
| } | ||
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| public func removeObservation(token: ObservationToken) { | ||
| token.cancel() | ||
| } | ||
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| public func removeAllObservations() { | ||
| observations.removeAll() | ||
| } | ||
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| func notifyObservers(about change: KeyChange<Storage.T>, in storage: Storage) { | ||
| observations.values.forEach { closure in | ||
| closure(storage, change) | ||
| } | ||
| } | ||
| } |
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