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Windows Developer Day

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  1. Windows Developer Day Fall Creators Update • Chris Cortes • UWP Program Manager • October 10, 2017

  2. Multitasking in the Fall Creators Update Single Process Model and Persistent Events • Chris Cortes • UWP Program Manager

  3. Multitasking in UWP • Single Process and Multiple Process Models • Multitasking for your Scenario • Persistent Events

  4. Single Process Model • Activate in Background • Launch/Activated • Background Activated • New Callbacks • Leaving Background • Entered Background • Suspended • Terminated • Foreground Resume • Background Resume

  5. Background Media Playback • Add Manifest Entry • Use any Windows Audio API • Stream to hold Network • <Capabilities> • <uap3:CapabilityName="backgroundMediaPlayback“ /> • </Capabilities> • var player = newMediaPlayer(); • player.Source = MediaSource.CreateFromUri(newUri("https://contoso.com/song.mp3")); • player.Play();

  6. Background Location Tracking • Extended Execution Reason • Check Background Access • Request in Foreground • privateasyncvoidStartNavigation(){ • session = newExtendedExecutionSession(); • session.Reason = ExtendedExecutionReason.LocationTracking; • session.Description = “Turn by Turn Navigation"; • session.Revoked += session_Revoked; • var result = awaitsession.RequestExtensionAsync(); • if (result == ExtendedExecutionResult.Allowed){ • StartPeriodicLocationUpdate(); • } • else { CheckBackgroundAccessAndNotifyUser(); } • } • privateasyncvoidsession_Revoked(object sender, ExtendedExecutionRevokedEventArgsargs){ • if(args.Reason == ExtendedExecutionRevokedReason.SystemPolicy){ • NotifyUser(); • } • }

  7. Run While Minimized • Extended Execution Reason • Handle Request Result • Handle Revoked Event • Battery-Aware • privateasyncvoidRequestBackgroundProjectCompilation(){ • session = newExtendedExecutionSession(); • session.Reason = ExtendedExecutionReason.Unspecified; • session.Description = “Compile Project File"; • session.Revoked += session_Revoked; • var result = awaitsession.RequestExtensionAsync(); • if (result == ExtendedExecutionResult.Allowed){ • StartCompilation(); • } • else { CheckBackgroundAccessAndNotifyUser(); } • } • privateasyncvoidsession_Revoked(object sender, ExtendedExecutionRevokedEventArgsargs){ • if(args.Reason == ExtendedExecutionRevokedReason.SystemPolicy){ • NotifyUser(); • } • }

  8. Restricted Scenarios for Enterprise • ExtendedBackgroundTaskTime • No Execution Time Exceeded on Background Tasks • Background Access and Battery Saver still apply • ExtendedExecutionUnconstrained • ExtendedExecutionForegroundSession • Run while Minimized until Standby

  9. Background Activation with Triggers • New Triggers and Capabilities Added Each Release • Multi-Instance • Resource Grouping • Task Grouping • Background Activated • Overridden Method in XAML • Event on CoreApplication • Background Access Status • User Controls in Settings • Battery Saver

  10. Persistent Event Creation • . • Background Activation for Frameworks • Separate Registrations from AllTasks • Background Task Registration Group Event • Create Event Registration Token Table conststringMyTaskGroupId = "4F8904E0-3F25-9A0C-41D3-0305E82C3333"; conststringMyTaskGroupDebugName = "My Task Group"; var group = BackgroundTaskRegistration.GetTaskGroup(MyTaskGroupId); if (group == null) {      group = newBackgroundTaskRegistrationGroup(MyTaskGroupId, MyTaskGroupDebugName); } var builder = newBackgroundTaskBuilder(); builder.Name = "Tasks Name"; builder.IsNetworkRequested = true; builder.TaskEntryPoint = "Tasks.MyTask"; builder.SetTrigger(myTrigger)); builder.TaskGroup = group; builder.Register();

  11. Persistent Event Usage • Background Activation for Frameworks • App Subscribes to Event • App Unsubscribes to Unregister • public App(){ • this.InitializeComponent(); • this.Suspending += OnSuspending; • PersistentEvents.MaintenanceWindow += BgWork.Maintenance; • } • publicstaticvoid Maintenance(object sender, PersistentEventArgs e){ • vardef = e.GetDeferral(); • UpdateUserContent(); • def.Complete(); •  }

  12. Multitasking with the Single Process Model • Background Media Playback • Location Tracking • Run While Minimized • Restricted Scenarios for Enterprise • Background Activation • Persistent Events

  13. Additional Information • Single Process Model: https://docs.microsoft.com/en-us/windows/uwp/launch-resume/app-lifecycle • Background Activation: https://docs.microsoft.com/en-us/windows/uwp/launch-resume/create-and-register-an-inproc-background-task • Background Task Registration Groups: https://docs.microsoft.com/en-us/windows/uwp/launch-resume/group-background-tasks • Manifest Attributes for Background Tasks: https://docs.microsoft.com/en-us/windows/uwp/launch-resume/declare-background-tasks-in-the-application-manifest

  14. Code Samples • Background Media Playback: https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/BackgroundMediaPlayback • Extended Execution: https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/ExtendedExecution • Background Activation: https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/BackgroundActivation • Persistent Events: https://github.com/cc-cortes/Simple-Persistent-Events

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