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81 lines
3.3 KiB
81 lines
3.3 KiB
//
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// CallbackQueue.swift
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// Kingfisher
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//
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// Created by onevcat on 2018/10/15.
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//
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// Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
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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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import Foundation
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/// Represents callback queue behaviors when an calling of closure be dispatched.
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///
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/// - asyncMain: Dispatch the calling to `DispatchQueue.main` with an `async` behavior.
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/// - currentMainOrAsync: Dispatch the calling to `DispatchQueue.main` with an `async` behavior if current queue is not
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/// `.main`. Otherwise, call the closure immediately in current main queue.
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/// - untouch: Do not change the calling queue for closure.
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/// - dispatch: Dispatches to a specified `DispatchQueue`.
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public enum CallbackQueue {
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/// Dispatch the calling to `DispatchQueue.main` with an `async` behavior.
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case mainAsync
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/// Dispatch the calling to `DispatchQueue.main` with an `async` behavior if current queue is not
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/// `.main`. Otherwise, call the closure immediately in current main queue.
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case mainCurrentOrAsync
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/// Do not change the calling queue for closure.
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case untouch
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/// Dispatches to a specified `DispatchQueue`.
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case dispatch(DispatchQueue)
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public func execute(_ block: @escaping () -> Void) {
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switch self {
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case .mainAsync:
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DispatchQueue.main.async { block() }
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case .mainCurrentOrAsync:
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DispatchQueue.main.safeAsync { block() }
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case .untouch:
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block()
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case .dispatch(let queue):
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queue.async { block() }
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}
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}
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var queue: DispatchQueue {
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switch self {
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case .mainAsync: return .main
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case .mainCurrentOrAsync: return .main
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case .untouch: return OperationQueue.current?.underlyingQueue ?? .main
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case .dispatch(let queue): return queue
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}
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}
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}
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extension DispatchQueue {
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// This method will dispatch the `block` to self.
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// If `self` is the main queue, and current thread is main thread, the block
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// will be invoked immediately instead of being dispatched.
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func safeAsync(_ block: @escaping ()->()) {
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if self === DispatchQueue.main && Thread.isMainThread {
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block()
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} else {
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async { block() }
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}
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}
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}
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