On Thu, Mar 6, 2014 at 2:14 PM, Barry Warsaw <[email protected]> wrote: > On Mar 06, 2014, at 02:13 PM, Alejandro J. Cura wrote: > >>So, while the updates are downloading, how is s-i kept alive if the >>user switches to other apps? Is it somehow escaping the app lifecycle? > > Yes, because s-i isn't an app. It's a system bus service itself which is > invoked by system settings via D-Bus activation. (It actually starts a u-d-m > instance on the system bus too.) > >>Also, is there a reason for that? For the scope there is no reason, so >>I think it's better for it to die and free the ram. > > Yes, because s-i is the mediator between the ui (i.e. system-settings) and > udm. It actually makes several group download calls to udm in order to > perform and validate a system update. > > But you say the scope has no reason to stay alive. Wouldn't "responding to > the 'finish' signal" be a good reason?
Hi Barry, thanks for this discussion, it has helped clear my head on how this should work. No, I don't think "responding to the 'finish' signal" is good enough of a reason to keep the scope alive. I still think that udm doing *something* when the download is completed is the right way to go. Scopes are started by the scope-runner when needed, and they might be killed too if needed or if they are idle. This makes sense, since we don't want to keep ram allocated to them if they are waiting, and since they are usually cheap to restart. I hear that there's work to make the dash work like any other app, so it might be also subjected to the app lifecycle, and it would make sense for the scope-runner to be stopped in that case too. In any case, 3rd party apps using the download manager service will be subject to the app lifecycle, and they very likely won't be around to listen to that signal. Furthermore, the download-manager knows how to retry downloads even after a reboot, and again, apps (or scopes) won't be even started. cheers, -- alecu -- Mailing list: https://launchpad.net/~ubuntu-phone Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-phone More help : https://help.launchpad.net/ListHelp
