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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| extension Operators { | ||
| internal final class CollectEvery<Value, Error: Swift.Error>: UnaryAsyncOperator<Value, [Value], Error> { | ||
| let interval: DispatchTimeInterval | ||
| let discardWhenCompleted: Bool | ||
| let targetWithClock: DateScheduler | ||
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| private let state: Atomic<CollectEveryState<Value>> | ||
| private let timerDisposable = SerialDisposable() | ||
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| init( | ||
| downstream: Observer<[Value], Error>, | ||
| downstreamLifetime: Lifetime, | ||
| target: DateScheduler, | ||
| interval: DispatchTimeInterval, | ||
| skipEmpty: Bool, | ||
| discardWhenCompleted: Bool | ||
| ) { | ||
| self.interval = interval | ||
| self.discardWhenCompleted = discardWhenCompleted | ||
| self.targetWithClock = target | ||
| self.state = Atomic(CollectEveryState(skipEmpty: skipEmpty)) | ||
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| super.init(downstream: downstream, downstreamLifetime: downstreamLifetime, target: target) | ||
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| downstreamLifetime += timerDisposable | ||
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| let initialDate = targetWithClock.currentDate.addingTimeInterval(interval) | ||
| timerDisposable.inner = targetWithClock.schedule(after: initialDate, interval: interval, leeway: interval * 0.1) { | ||
| let (currentValues, isCompleted) = self.state.modify { ($0.collect(), $0.isCompleted) } | ||
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| if let currentValues = currentValues { | ||
| self.unscheduledSend(currentValues) | ||
| } | ||
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| if isCompleted { | ||
| self.unscheduledTerminate(.completed) | ||
| } | ||
| } | ||
| } | ||
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| override func receive(_ value: Value) { | ||
| state.modify { $0.values.append(value) } | ||
| } | ||
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| override func terminate(_ termination: Termination<Error>) { | ||
| guard isActive else { return } | ||
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| if case .completed = termination, !discardWhenCompleted { | ||
| state.modify { $0.isCompleted = true } | ||
| } else { | ||
| timerDisposable.dispose() | ||
| super.terminate(termination) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| private struct CollectEveryState<Value> { | ||
| let skipEmpty: Bool | ||
| var values: [Value] = [] | ||
| var isCompleted: Bool = false | ||
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| init(skipEmpty: Bool) { | ||
| self.skipEmpty = skipEmpty | ||
| } | ||
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| var hasValues: Bool { | ||
| return !values.isEmpty || !skipEmpty | ||
| } | ||
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| mutating func collect() -> [Value]? { | ||
| guard hasValues else { return nil } | ||
| defer { values.removeAll() } | ||
| return values | ||
| } | ||
| } |
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