There is also another important issue here: The tasks can be configured by the settings app, using the RequestSyncManager API. This means that if an app wants to do something every 20 minutes, the user can change this minInterval, or he/she can change if the task has to run only when the device is connected to a wifi network. He/she can event disable the task completely.
b On Thu, Jan 8, 2015 at 12:49 AM, Jonas Sicking <[email protected]> wrote: > On Tue, Jan 6, 2015 at 5:55 AM, Jan Jongboom <[email protected]> > wrote: > > Hmm, this actually sucks for our use case: > > > > 1. minInterval - in seconds. It can happen that this operation will be > scheduled with a bigger interval. > > > > How hard would it be to make this an *exact* interval? > > The point of the API is to *not* be exact. And instead allow the > platform to schedule callbacks whenever is most battery efficient to > run them. > > This way if two apps ask to sync data, one every 20 minutes and one > ever 25 minutes, rather than wake up the CPU and radio twice, we can > just wake it up once and tell both apps to sync. Likewise, if the user > turns off syncing for one of the apps, we won't wake that app up at > all. > > It also means that we can do things like: If an app asks to sync every > 20 minutes, but at a given sync interval there is no internet > connection, we won't wake the app up at all (thus saving battery). But > if 2 minutes later we do get internet connectivity, we won't need to > wait another 18 minutes, we can immediately wake up the app and tell > it to sync. > > What problem are you trying to solve by enabling an exact interval? > I.e. what type of app/website are you building, and how do you want > that app/website to behave? > > What do you want to happen if there is no internet connectivity at the > exact interval that you specified but there is internet connectivity 2 > minutes later? Do you want the user to be able to override how often > the callback fires? > > / Jonas > _______________________________________________ > dev-b2g mailing list > [email protected] > https://lists.mozilla.org/listinfo/dev-b2g >
_______________________________________________ dev-b2g mailing list [email protected] https://lists.mozilla.org/listinfo/dev-b2g
