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//
// BackgroundObserver.swift
// MullvadVPN
//
// Created by pronebird on 31/05/2022.
//
#if canImport(UIKit)
import UIKit
class BackgroundObserver: OperationObserver {
let name: String
let application: UIApplication
let cancelUponExpiration: Bool
private var taskIdentifier: UIBackgroundTaskIdentifier?
init(
application: UIApplication = .shared,
name: String,
cancelUponExpiration: Bool
)
{
self.application = application
self.name = name
self.cancelUponExpiration = cancelUponExpiration
}
func didAttach(to operation: Operation) {
let expirationHandler = cancelUponExpiration ? { operation.cancel() } : nil
taskIdentifier = application.beginBackgroundTask(
withName: name,
expirationHandler: expirationHandler
)
}
func operationDidStart(_ operation: Operation) {
// no-op
}
func operationDidCancel(_ operation: Operation) {
// no-op
}
func operationDidFinish(_ operation: Operation) {
if let taskIdentifier = taskIdentifier {
application.endBackgroundTask(taskIdentifier)
}
}
}
#endif
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