84 lines
2.9 KiB
Swift
84 lines
2.9 KiB
Swift
//
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// Copyright (c) 2022 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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public final class ClosureAsyncOperation<Output, Failure: Error>: AsyncOperation<Output, Failure> {
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public typealias AsyncTaskClosure = () async -> Result<Output, Failure>
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public typealias CancellableTaskClosure = (@escaping (Result<Output, Failure>) -> Void) -> Cancellable
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private let cancellableTaskClosure: CancellableTaskClosure
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private var cancellableTask: Cancellable?
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public init(cancellableTaskClosure: @escaping CancellableTaskClosure) {
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self.cancellableTaskClosure = cancellableTaskClosure
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super.init()
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self.state = .isReady
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}
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@available(iOS 13.0, *)
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public convenience init(asyncTaskClosure: @escaping AsyncTaskClosure) {
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self.init { completion in
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Task {
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completion(await asyncTaskClosure())
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}
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}
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}
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public override func start() {
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super.start()
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cancellableTask = cancellableTaskClosure { [weak self] in
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self?.handle(result: $0)
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}
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}
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public override func cancel() {
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super.cancel()
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cancellableTask?.cancel()
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}
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}
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public extension ClosureAsyncOperation {
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typealias NeverFailCancellableTaskClosure = (@escaping (Output) -> Void) -> Cancellable
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convenience init(neverFailCancellableTaskClosure: @escaping NeverFailCancellableTaskClosure) where Failure == Never {
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self.init(cancellableTaskClosure: { completion in
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neverFailCancellableTaskClosure {
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completion(.success($0))
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}
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})
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}
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}
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@available(iOS 13.0, *)
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public extension ClosureAsyncOperation {
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typealias NeverFailAsyncTaskClosure = () async -> Output
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convenience init(asyncTaskClosure: @escaping NeverFailAsyncTaskClosure) where Failure == Never {
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self.init {
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await .success(asyncTaskClosure())
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}
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}
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}
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