Hi Marcel, On 30 March 2012 08:58, Marcel Holtmann <[email protected]> wrote: > Hi, > >> + ServicesChanged(array{object, dict}, array{object}) >> + >> + Signals a list of services that have been changed >> + via the first array. And a list of service that >> + have been removed via the second array. >> + >> + The list of added services is sorted. The dictionary >> + with the properties might be empty in case none of >> + the properties have changed. Or only contains the >> + properties that have changed. >> + >> + For newly added services the whole set of properties >> + will be present. >> + >> + The list of removed services can be empty. >> + >> + This signal will only be triggered when the sort >> + order of the service list or the number of services >> + changes. It will not be emitted if only a property >> + of the service object changes. For that it is >> + required to watch the PropertyChanged signal of >> + the service object. >> + > > so I might need to give some background here. We are trying to promote > the final stable 1.0 API and this is the last piece that is still open. > It has been discussed on IRC and F2F as well, but not a full conclusion > has been reached. > > Problem is that the order of service can change. Either by a service > being connected or if the signal strength changed. There was no way to > signal this change right now. > > The other problem is that ServicesAdded and ServicesRemoved signals have > a weird dependency on ServicesRemoved being send before ServicesAdded in > case services get removed and added at the same time. While this seems > fine, it is a potential race condition since the signal order leaving > ConnMan might not be the same when arriving at the client. > > To solve both problems, we should just combine both signals into one > called ServicesChanged and have it list the added and removed services > in one go. > > Regards > > Marcel >
How the client can figure out what happened in these two cases: 1. service is removed and then immediately added (service now exists) 2. service is added and then immediately removed (service does not exist any more) so we would get only one signal in this case but the end result is quite different from client point of view as the client cannot know if the service exists or not. Cheers, Jukka _______________________________________________ connman mailing list [email protected] http://lists.connman.net/listinfo/connman
