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|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| // | ||
| // 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. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
||
| 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>() | ||
|
|
||
| var pending = false { | ||
| didSet { | ||
| guard pending == false else { return } | ||
| executeNext() | ||
| } | ||
| } | ||
|
|
||
| func clear() { | ||
| tasks.removeAll() | ||
| } | ||
|
|
||
| func enqueue(id: String, task: @escaping VoidTask) { | ||
| guard tasks.contains(where: { $0.id == id }) == false else { return } | ||
| self.tasks.append((id, task)) | ||
| } | ||
|
|
||
| func dequeue(_ completion: @escaping (String, VoidTask?) -> Void) { | ||
| guard let task = self.tasks.remove(at: 0) else { | ||
| completion("", nil) | ||
| return | ||
| } | ||
| completion(task.id, task.task) | ||
| } | ||
|
|
||
| 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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