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// | ||
// AsyncTaskScheduler.swift | ||
// Proton | ||
// | ||
// Created by Rajdeep Kwatra on 11/9/2023. | ||
// Copyright © 2023 Rajdeep Kwatra. All rights reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
// | ||
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import Foundation | ||
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class AsyncTaskScheduler { | ||
typealias VoidTask = () -> Void | ||
private var executing = false | ||
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private var tasks = SynchronizedArray<(id: String, task: VoidTask)>() | ||
private var scheduled = SynchronizedArray<String>() | ||
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var pending = false { | ||
didSet { | ||
guard pending == false else { return } | ||
executeNext() | ||
} | ||
} | ||
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func clear() { | ||
tasks.removeAll() | ||
} | ||
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func enqueue(id: String, task: @escaping VoidTask) { | ||
guard tasks.contains(where: { $0.id == id }) == false else { return } | ||
self.tasks.append((id, task)) | ||
} | ||
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func dequeue(_ completion: @escaping (String, VoidTask?) -> Void) { | ||
guard let task = self.tasks.remove(at: 0) else { | ||
completion("", nil) | ||
return | ||
} | ||
completion(task.id, task.task) | ||
} | ||
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func executeNext() { | ||
guard !pending else { return } | ||
dequeue { id, task in | ||
if let task { | ||
self.pending = true | ||
// A delay is required so that tracking mode may be intercepted. | ||
// Intercepting tracking allows handling of user interactions on UI | ||
DispatchQueue.main.asyncAfter(deadline: .now() + 0.001) { [weak self] in | ||
guard let self else { return } | ||
if RunLoop.current.currentMode != .tracking { | ||
task() | ||
} else { | ||
self.tasks.insert((id: id, task: task), at: 0) | ||
} | ||
self.pending = false | ||
} | ||
} | ||
} | ||
} | ||
} |
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