97 lines
2.7 KiB
Swift
97 lines
2.7 KiB
Swift
//
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// UIKitBackgroundTask.swift
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// ElementX
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//
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// Created by Ismail on 28.06.2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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import Foundation
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import UIKit
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/// UIKitBackgroundTask is a concrete implementation of BackgroundTaskProtocol using UIApplication background task.
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class UIKitBackgroundTask: BackgroundTaskProtocol {
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let name: String
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var isRunning: Bool {
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identifier != .invalid
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}
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let isReusable: Bool
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let expirationHandler: BackgroundTaskExpirationHandler?
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var elapsedTime: TimeInterval {
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Date().timeIntervalSince(startDate) * 1000
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}
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private let application: ApplicationProtocol
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private var identifier: UIBackgroundTaskIdentifier = .invalid
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private var useCounter = 0
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private let startDate = Date()
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/// Initializes and starts a new background task
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/// - Parameters:
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/// - name: name
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/// - isReusable: flag indicating the task is reusable
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/// - application: application instance
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/// - expirationHandler: expiration handler
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init?(name: String,
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isReusable: Bool,
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application: ApplicationProtocol,
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expirationHandler: BackgroundTaskExpirationHandler?) {
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self.name = name
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self.isReusable = isReusable
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self.application = application
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self.expirationHandler = expirationHandler
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// attempt to start
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identifier = application.beginBackgroundTask(withName: name) { [weak self] in
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guard let self = self else { return }
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self.expirationHandler?(self)
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}
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if identifier == .invalid {
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MXLog.verbose("[UIKitBackgroundTask] Do not start background task: \(name), as OS declined")
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// call expiration handler immediately
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expirationHandler?(self)
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return nil
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}
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if isReusable {
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// creation itself is a use
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reuse()
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}
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MXLog.verbose("[UIKitBackgroundTask] Start background task #\(identifier.rawValue) - \(name)")
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}
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func reuse() {
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guard isReusable else {
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return
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}
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useCounter += 1
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}
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func stop() {
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if isReusable {
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useCounter -= 1
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if useCounter <= 0 {
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endTask()
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}
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} else {
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endTask()
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}
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}
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private func endTask() {
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if identifier != .invalid {
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MXLog.verbose("[UIKitBackgroundTask] End background task #\(identifier.rawValue) - \(name) after \(readableElapsedTime)")
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application.endBackgroundTask(identifier)
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identifier = .invalid
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}
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}
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private var readableElapsedTime: String {
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String(format: "%.3fms", elapsedTime)
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}
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}
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