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Merge pull request hyperoslo#201 from hyperoslo/feature/storage-obser…
…vations Feature: storage observations
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| public final class ObservationToken { | ||
| private let cancellationClosure: () -> Void | ||
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| init(cancellationClosure: @escaping () -> Void) { | ||
| self.cancellationClosure = cancellationClosure | ||
| } | ||
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| public func cancel() { | ||
| cancellationClosure() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| import Foundation | ||
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| public final class StorageObservationRegistry<T: StorageAware> { | ||
| public typealias Observation = (T, StorageChange) -> Void | ||
| private(set) var observations = [UUID: Observation]() | ||
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| @discardableResult | ||
| public func addObservation(_ observation: @escaping Observation) -> ObservationToken { | ||
| let id = UUID() | ||
| observations[id] = observation | ||
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| return ObservationToken { [weak self] in | ||
| self?.observations.removeValue(forKey: id) | ||
| } | ||
| } | ||
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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: StorageChange, in storage: T) { | ||
| observations.values.forEach { closure in | ||
| closure(storage, change) | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| public enum StorageChange: Equatable { | ||
| case add(key: String) | ||
| case remove(key: String) | ||
| case removeAll | ||
| case removeExpired | ||
| } | ||
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| public func == (lhs: StorageChange, rhs: StorageChange) -> Bool { | ||
| switch (lhs, rhs) { | ||
| case (.add(let key1), .add(let key2)), (.remove(let key1), .remove(let key2)): | ||
| return key1 == key2 | ||
| case (.removeAll, .removeAll), (.removeExpired, .removeExpired): | ||
| return true | ||
| default: | ||
| return false | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| import XCTest | ||
| @testable import Cache | ||
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| final class ObservationTokenTests: XCTestCase { | ||
| func testCancel() { | ||
| var cancelled = false | ||
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| let token = ObservationToken { | ||
| cancelled = true | ||
| } | ||
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| token.cancel() | ||
| XCTAssertTrue(cancelled) | ||
| } | ||
| } |
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