Robust applications ' Always on '.

I'm working on a program that must run on the background at all times. At the moment I have something like this (app is a UiApplication)

"app startup", entry point alternative which stores itself to RuntimeStore and enters the event dispatcher. It is started automatically at startup. "start the application" icon is not visible in the home screen.

'app', point of main entry. Retrieves the instance "always running" RuntimeStore and adds a pushScreen to his event (with invokeLater) queue. This entry point is visible in the home screen.

When the last screen of the user interface is closed, the application is requestBackground() and does not end.

Usually, it works pretty well. However, what should I do if starting "app" broke down or did not start? (The RuntimeStore is null, or the app object is not running (! app.isAlive ()) if my main entry point enters the event dispatcher, I can't use its icon to start the application (I get "App is already running").)

If your background application stops or ends, you can use the ApplicationManager for the rear shot. You need to check this in your user name started app, and if there is no instance of the background application, then create it and wait that it begin before preceding to load. I never really tried to revive a background app, but I launched various entry points of the same application in this case.

Tags: BlackBerry Developers

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