feat: Implement shedding identity queue #343
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| import Foundation | ||
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| /** | ||
| Denotes the result of an identify request made through the `LDClient.identify(context: completion:)` method. | ||
| */ | ||
| public enum IdentifyResult { | ||
| /** | ||
| The identify request has completed successfully. | ||
| */ | ||
| case complete | ||
| /** | ||
| The identify request has received an unrecoverable failure. | ||
| */ | ||
| case error | ||
| /** | ||
| The identify request has been replaced with a subsequent request. See `LDClient.identify(context: completion:)` for more details. | ||
| */ | ||
| case shed | ||
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| init(from: TaskResult) { | ||
| switch from { | ||
| case .complete: | ||
| self = .complete | ||
| case .error: | ||
| self = .error | ||
| case .shed: | ||
| self = .shed | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| import Foundation | ||
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| enum TaskResult { | ||
| case complete | ||
| case error | ||
| case shed | ||
| } | ||
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| typealias TaskHandlerCompletion = () -> Void | ||
| typealias TaskHandler = (_ completion: @escaping TaskHandlerCompletion) -> Void | ||
| typealias TaskCompletion = (_ result: TaskResult) -> Void | ||
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| struct Task { | ||
| let work: TaskHandler | ||
| let sheddable: Bool | ||
| let completion: TaskCompletion | ||
| } | ||
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| class SheddingQueue { | ||
| private let stateQueue: DispatchQueue = DispatchQueue(label: "StateQueue") | ||
| private let identifyQueue: DispatchQueue = DispatchQueue(label: "IdentifyQueue") | ||
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| private var inFlight: Task? | ||
| private var queue: [Task] = [] | ||
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| func enqueue(request: Task) { | ||
| stateQueue.async { [self] in | ||
| guard inFlight != nil else { | ||
| inFlight = request | ||
| identifyQueue.async { self.execute() } | ||
| return | ||
| } | ||
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| if let lastTask = queue.last, lastTask.sheddable { | ||
| queue.removeLast() | ||
| lastTask.completion(.shed) | ||
| } | ||
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| queue.append(request) | ||
| } | ||
| } | ||
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| private func execute() { | ||
| var nextTask: Task? | ||
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| stateQueue.sync { | ||
| nextTask = inFlight | ||
| } | ||
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| if nextTask == nil { | ||
| return | ||
| } | ||
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| guard let request = nextTask else { return } | ||
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| request.work() { [self] in | ||
| request.completion(.complete) | ||
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| stateQueue.sync { | ||
| inFlight = queue.first | ||
| if inFlight != nil { | ||
| queue.remove(at: 0) | ||
| identifyQueue.async { self.execute() } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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Deprecating this method so that customers will start moving over to the callback that informs them of success or failure.