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Simon Brockmann
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May 7, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| // | ||
| // CancellationToken.swift | ||
| // BoltsSwift | ||
| // | ||
| // Copyright © 2019 Facebook. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
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| public typealias CancellationObserver = () -> Void | ||
|
|
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| public final class CancellationToken { | ||
| public var cancellationRequested: Bool { | ||
| get { | ||
| return synchronizationQueue.sync(flags: .barrier) { () -> Bool in | ||
| return _cancellationRequested | ||
|
|
||
| } | ||
| } | ||
| } | ||
|
|
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| private let synchronizationQueue = DispatchQueue(label: "com.bolts.cancellationToken", attributes: DispatchQueue.Attributes.concurrent) | ||
| private var _cancellationRequested: Bool | ||
| private var _regestrations = [CancellationTokenRegistration]() | ||
| private var _disposed: Bool | ||
| private var _cancelDelayedWorkItem: DispatchWorkItem? | ||
|
|
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| public init() { | ||
| _cancellationRequested = false | ||
| _disposed = false | ||
| } | ||
|
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| @discardableResult | ||
| public func registerCancellationObserver(observer: @escaping CancellationObserver) -> CancellationTokenRegistration? { | ||
| return synchronizationQueue.sync(flags: .barrier) { () -> CancellationTokenRegistration? in | ||
| if _disposed { | ||
| return nil | ||
| } | ||
| let registration = CancellationTokenRegistration.registrationWithToken(token: self, observer: observer) | ||
| _regestrations.append(registration) | ||
| return registration | ||
| } | ||
| } | ||
|
|
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| internal func unrigsterRegistration(registration: CancellationTokenRegistration) throws { | ||
| try synchronizationQueue.sync(flags: .barrier) { () -> Void in | ||
| try throwIfDisposed() | ||
| if let index = _regestrations.firstIndex(where: { $0 === registration }) { | ||
| _regestrations.remove(at: index) | ||
| } | ||
| } | ||
| } | ||
|
|
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| internal func cancel() throws { | ||
| var registrations: [CancellationTokenRegistration]? | ||
| try synchronizationQueue.sync(flags: .barrier) { () -> Void in | ||
| try throwIfDisposed() | ||
| if _cancellationRequested { | ||
| return | ||
| } | ||
| if let cancelWorkItem = _cancelDelayedWorkItem { | ||
| cancelWorkItem.cancel() | ||
| _cancelDelayedWorkItem = nil | ||
| } | ||
| _cancellationRequested = true | ||
| registrations = [CancellationTokenRegistration](_regestrations) | ||
| } | ||
| if registrations == nil { | ||
| return | ||
| } | ||
| try notifyCancellation(registrations: registrations!) | ||
| } | ||
|
|
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| private func notifyCancellation(registrations: [CancellationTokenRegistration]) throws { | ||
| for registration in registrations { | ||
| try registration.notifyDelegate() | ||
| } | ||
| } | ||
|
|
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| internal func cancelAfterInterval(interval: TimeInterval) throws { | ||
| try throwIfDisposed() | ||
|
|
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| if interval < 0 { | ||
| throw IntervalError() | ||
| } | ||
|
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| if interval == 0 { | ||
| try cancel() | ||
| return | ||
| } | ||
|
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| try synchronizationQueue.sync(flags: .barrier) { () -> Void in | ||
| try throwIfDisposed() | ||
| if let cancelWorkItem = _cancelDelayedWorkItem { | ||
| cancelWorkItem.cancel() | ||
| _cancelDelayedWorkItem = nil | ||
| } | ||
| if _cancellationRequested { | ||
| return | ||
| } | ||
| _cancelDelayedWorkItem = DispatchWorkItem { [weak self] in | ||
| try? self?.cancel() | ||
| } | ||
| DispatchQueue.global().asyncAfter(deadline: .now() + interval, execute: _cancelDelayedWorkItem!) | ||
| } | ||
| } | ||
|
|
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| internal func dispose() throws { | ||
| var registrations: [CancellationTokenRegistration]? | ||
| synchronizationQueue.sync(flags: .barrier) { () -> Void in | ||
| if _disposed { | ||
| return | ||
| } | ||
| registrations = [CancellationTokenRegistration](_regestrations) | ||
| _regestrations.removeAll() | ||
| } | ||
| if registrations != nil { | ||
| try registrations!.forEach { | ||
| try $0.dispose() | ||
| } | ||
| } | ||
| synchronizationQueue.sync(flags: .barrier, execute: { () -> Void in | ||
| _disposed = true | ||
| }) | ||
| } | ||
|
|
||
| private func throwIfDisposed() throws { | ||
| if _disposed { | ||
| throw DisposedError() | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| // | ||
| // CancellationTokenRegistration.swift | ||
| // BoltsSwift | ||
| // | ||
| // Copyright © 2019 Facebook. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
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| public final class CancellationTokenRegistration { | ||
| private var _disposed: Bool | ||
| private let _synchronizationQueue = DispatchQueue(label: "com.bolts.cancellationTokenRegistration", attributes: DispatchQueue.Attributes.concurrent) | ||
| private var _observer: CancellationObserver? | ||
| private weak var _token: CancellationToken? | ||
|
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| private init(token: CancellationToken, observer: @escaping CancellationObserver) { | ||
| _disposed = false | ||
| _observer = observer | ||
| _token = token | ||
| } | ||
|
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| public class func registrationWithToken(token: CancellationToken, observer: @escaping CancellationObserver) -> CancellationTokenRegistration { | ||
| return CancellationTokenRegistration(token: token, observer: observer) | ||
| } | ||
|
|
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| public func dispose() throws { | ||
| _synchronizationQueue.sync(flags: .barrier) { () -> Void in | ||
| if _disposed { | ||
| return | ||
| } | ||
| _disposed = true | ||
| } | ||
| if let token = _token { | ||
| try token.unrigsterRegistration(registration: self) | ||
| _token = nil | ||
| } | ||
| _observer = nil | ||
| } | ||
|
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| internal func notifyDelegate() throws { | ||
| try _synchronizationQueue.sync(flags: .barrier) { () -> Void in | ||
| try throwIfDisposed() | ||
| _observer?() | ||
| } | ||
| } | ||
|
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| private func throwIfDisposed() throws { | ||
| if _disposed { | ||
| throw DisposedError() | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| // | ||
| // CancellationTokenSource.swift | ||
| // BoltsSwift | ||
| // | ||
| // Copyright © 2019 Facebook. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
|
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| public final class CancellationTokenSource { | ||
| public private(set) var token: CancellationToken | ||
|
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| public init() { | ||
| token = CancellationToken() | ||
| } | ||
|
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| public class func cancellationTokenSource() -> CancellationTokenSource { | ||
| return CancellationTokenSource() | ||
| } | ||
|
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| public func isCancellationRequested() -> Bool { | ||
| return token.cancellationRequested | ||
| } | ||
|
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| public func cancel() throws { | ||
| try token.cancel() | ||
| } | ||
|
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| public func cancelAfterInterval(interval: TimeInterval) throws { | ||
| try token.cancelAfterInterval(interval: interval) | ||
| } | ||
|
|
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| public func dispose() throws { | ||
| try token.dispose() | ||
| } | ||
| } |
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