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//
// BackgroundObserver.swift
// Operations
//
// Created by pronebird on 31/05/2022.
// Copyright © 2022 Mullvad VPN AB. All rights reserved.
//
#if canImport(UIKit)
import UIKit
@available(iOSApplicationExtension, unavailable)
public final class BackgroundObserver: OperationObserver {
public let name: String
public let application: UIApplication
public let cancelUponExpiration: Bool
private var taskIdentifier: UIBackgroundTaskIdentifier?
public init(application: UIApplication, name: String, cancelUponExpiration: Bool) {
self.application = application
self.name = name
self.cancelUponExpiration = cancelUponExpiration
}
public func didAttach(to operation: Operation) {
let expirationHandler = cancelUponExpiration ? { operation.cancel() } : nil
taskIdentifier = application.beginBackgroundTask(
withName: name,
expirationHandler: expirationHandler
)
}
public func operationDidStart(_ operation: Operation) {
// no-op
}
public func operationDidCancel(_ operation: Operation) {
// no-op
}
public func operationDidFinish(_ operation: Operation, error: Error?) {
if let taskIdentifier {
application.endBackgroundTask(taskIdentifier)
}
}
}
#endif
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