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Rework how background refresh works to eliminate background session usage.

This commit is contained in:
Maurice Parker 2019-04-26 08:43:41 -05:00
parent fb9c1aa983
commit 284e713a9d
1 changed files with 17 additions and 33 deletions
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50
iOS/AppDelegate.swift
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@ -137,54 +137,38 @@ class AppDelegate: UIResponder, UIApplicationDelegate, UISplitViewControllerDele
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
func application(_ application: UIApplication, handleEventsForBackgroundURLSession identifier: String, completionHandler: @escaping () -> Void) {
// We won't know when the last feed is inserted into the database or when the last unread count
// change event will come, but we do know when the url session has completed sending
var urlSessionDone = false
BackgroundDownloadSession.completionHandler = {
urlSessionDone = true
completionHandler()
}
func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
os_log("Handle background URL Session.", log: log, type: .info)
os_log("Woken to perform account refresh.", log: log, type: .info)
AccountManager.shared.refreshAll()
os_log("Accounts requested to begin refresh.", log: self.log, type: .debug)
DispatchQueue.global(qos: .background).async { [unowned self] in
// Set up a background task to let iOS know not to kill us
self.backgroundUpdateTask = UIApplication.shared.beginBackgroundTask {
UIApplication.shared.endBackgroundTask(self.backgroundUpdateTask)
self.backgroundUpdateTask = UIBackgroundTaskIdentifier.invalid
completionHandler(.newData)
}
// Wait until 5 seconds after the url session has stopped sending
// This should give us plenty of time to insert database rows and update unread counts
var lastBusy = Date()
var checking = true
while (checking) {
if !urlSessionDone {
lastBusy = Date()
}
if lastBusy.addingTimeInterval(5) < Date() {
checking = false
} else {
sleep(1)
}
sleep(1)
while(!AccountManager.shared.combinedRefreshProgress.isComplete) {
os_log("Waiting for account refresh processing to complete...", log: self.log, type: .debug)
sleep(1)
}
os_log("Completed processing background URL Session.", log: self.log, type: .info)
os_log("Accounts completed refresh processing.", log: self.log, type: .info)
UIApplication.shared.endBackgroundTask(self.backgroundUpdateTask)
self.backgroundUpdateTask = UIBackgroundTaskIdentifier.invalid
}
completionHandler(.newData)
}
func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
os_log("Worken to perform fetch activity.", log: log, type: .info)
AccountManager.shared.refreshAll(refreshMode: .background)
}
completionHandler(.newData)
}
// MARK: - Split view