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| /* | ||
| * Hydra | ||
| * Fullfeatured lightweight Promise & Await Library for Swift | ||
| * | ||
| * Created by: Daniele Margutti | ||
| * Email: [email protected] | ||
| * Web: http://www.danielemargutti.com | ||
| * Twitter: @danielemargutti | ||
| * | ||
| * Copyright © 2017 Daniele Margutti | ||
| * | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| * THE SOFTWARE. | ||
| * | ||
| */ | ||
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| import Foundation | ||
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| extension Promise { | ||
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| //MARK: Promise Observer | ||
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| /// This enum represent an observer which receive the state of a promise. | ||
| /// | ||
| /// - onResolve: register an handler which is executed only if target promise is fulfilled. | ||
| /// - onReject: register an handler which is executed only if target promise is rejected. | ||
| internal indirect enum Observer { | ||
| typealias ResolveObserver = ((Value) -> (Void)) | ||
| typealias RejectObserver = ((Error) -> (Void)) | ||
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| case onResolve(_: Context, _: ResolveObserver) | ||
| case onReject(_: Context, _: RejectObserver) | ||
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| /// Call the observer by state | ||
| /// | ||
| /// - Parameter state: State | ||
| func call(_ state: State) { | ||
| switch (self, state) { | ||
| case (.onResolve(let context, let handler), .resolved(let value)): | ||
| context.queue.async { | ||
| handler(value) | ||
| } | ||
| case (.onReject(let context, let handler), .rejected(let error)): | ||
| context.queue.async { | ||
| handler(error) | ||
| } | ||
| default: | ||
| return | ||
| } | ||
| } | ||
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| } | ||
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| } |