Metadata preserved across reboots?
Tomeu, As I've mentioned before, I'm working on an EText reading activity that uses metadata to save the current page number when the activity closes, kind of like a bookmark. When the activity is resumed the saved page number would be shown. This works just fine while the XO is turned on, but the page number metadata disappears when you reboot or turn the machine off and on. I'm using the same code that the Read activity does for this purpose, and I notice that Read has exactly the same problem. This is frustrating. The journal entry shows a screenshot of the page I left off on, but I don't go back to that page on opening. I have also noticed that if I open the document from a USB card or an SD card no metadata is saved at all. I had been assuming that this was a bug in Sugar that would be fixed at some point. Your text below makes it sound like this is an actual deliberate feature. Am I understanding this correctly? James Simmons I also went through a number of activity sources in git looking for examples, but I didn't find one that ONLY used metadata. They all seem to either not bother storing any UI state (so resuming or from new makes no difference), or they save actual files. I think at some point activities like those realize that they have some data that would be better saved in a file. But the determining reason would be that metadata properties other than the custom ones are not preserved across reboots :/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Metadata preserved across reboots?
On Thu, Feb 28, 2008 at 8:02 PM, James Simmons [EMAIL PROTECTED] wrote: Tomeu, As I've mentioned before, I'm working on an EText reading activity that uses metadata to save the current page number when the activity closes, kind of like a bookmark. When the activity is resumed the saved page number would be shown. This works just fine while the XO is turned on, but the page number metadata disappears when you reboot or turn the machine off and on. I'm using the same code that the Read activity does for this purpose, and I notice that Read has exactly the same problem. This is frustrating. The journal entry shows a screenshot of the page I left off on, but I don't go back to that page on opening. I have also noticed that if I open the document from a USB card or an SD card no metadata is saved at all. When is metadata not saved? Or you mean the metadata is saved but not retrieved? I had been assuming that this was a bug in Sugar that would be fixed at some point. Your text below makes it sound like this is an actual deliberate feature. Am I understanding this correctly? No, it's a big bug in the current implementation of the DataStore. Could be fixed in the current implementation, but there have been plans of rewriting it, so nobody has looked into this since a long time ago. See http://dev.laptop.org/ticket/4662 for more details. I also went through a number of activity sources in git looking for examples, but I didn't find one that ONLY used metadata. They all seem to either not bother storing any UI state (so resuming or from new makes no difference), or they save actual files. I think at some point activities like those realize that they have some data that would be better saved in a file. But the determining reason would be that metadata properties other than the custom ones are not preserved across reboots :/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Metadata preserved across reboots?
Tomeu, When I use the Read activity to open a document stored in a USB drive or my SD card I notice that I do not return to the page I was on previously, even though I have not restarted the computer at all; I've just ended the Read activity, then immediately resumed it. I also notice that I *never* get a screenshot from the previous use of any activity when I open the entry on a USB drive or SD card. All of these things work correctly in the Journal proper, except of course when rebooting. You keep the screenshot but lose the activity-specifc metadata like page number. On the USB and SD, I don't know if the metadata is saved or not. I suppose it could be saved and never retrieved. In any case, it's nice to know this is a bug and not intentional. James Simmons Tomeu Vizoso wrote: When is metadata not saved? Or you mean the metadata is saved but not retrieved? ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
