67 lines
2.6 KiB
Swift
67 lines
2.6 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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import Foundation
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private final class ClosureObserverOperation<Output, Failure: Error>: DependendAsyncOperation<Output, Failure> {
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public typealias OnResultClosure = (Result<Output, Failure>) -> Void
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public init(dependency: AsyncOperation<Output, Failure>,
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onResult: OnResultClosure? = nil,
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callbackQueue: DispatchQueue = .main) {
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super.init(dependency: dependency) { result in
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callbackQueue.async {
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onResult?(result)
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}
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return result
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}
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}
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}
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public extension AsyncOperation {
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func observe(onResult: ((Result<Output, Failure>) -> Void)? = nil,
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callbackQueue: DispatchQueue = .main) -> AsyncOperation<Output, Failure> {
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ClosureObserverOperation(dependency: self,
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onResult: onResult,
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callbackQueue: callbackQueue)
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}
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func observe(onSuccess: ((Output) -> Void)? = nil,
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onFailure: ((Failure) -> Void)? = nil,
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callbackQueue: DispatchQueue = .main) -> AsyncOperation<Output, Failure> {
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let onResult: ClosureObserverOperation<Output, Failure>.OnResultClosure = {
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switch $0 {
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case let .success(output):
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onSuccess?(output)
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case let .failure(error):
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onFailure?(error)
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}
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}
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return observe(onResult: onResult, callbackQueue: callbackQueue)
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}
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}
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