On Thu, May 3, 2012 at 2:04 AM, Jiyeon Kim <[email protected]>wrote:
> On Thursday, May 03, 2012 at 1:59AM, Alec Flett [email protected]: > **** > > Hi all.**** > > **** > > This is Jiyeon Kim recently joined webkit-dev mailing list.**** > > ** ** > > Welcome - I'm somewhat new here myself, but I am working on IndexedDB > support in WebKit..**** > > ** ** > > **** > > I’ve got two questions on IndexedDB.**** > > First, I wonder, while Web storage and Web SQL have tracker, why Indexed > DB doesn’t have tracker.**** > > ** ** > > What do you mean by "tracker" ?**** > > **è **Thank you for your reply. I mean that when you refer to > StorageTracker.cpp(for local storage)file and DatabaseTracker.cpp(for web > sql) file, they have “tracker” for each functions.**** > > So I would like to know why indexed database doesn’t have tracker.**** > > **** > > Second, if you look at *IDBFactory::*open*() method in IDBFactory.cpp* > file,**** > > the fifth argument of *m_backend->open(name, request.get(), > context->securityOrigin(), frame, String());* is not about path > information but a string (i.e.,* > document->page()->group().groupSettings()->indexedDBDatabasePath()*;).*** > * > > I also wonder why it is a string rather than a path.**** > > The m_backend is an interface to the actual database implementation - that > tends to deal with stuff at a slightly lower level (i.e. actual paths on > disk, etc) - are you looking for a url path? All the IDB's for a security > origin are accessable to each other, and not connected to the rest of the > URL (i.e. http://foo.com/abc has the same security origin as > http://foo.com/xyz so they have access to the same set of IDB files, so > indexedDBDatabasePath() is the same)**** > > **è **As you know, refer to IDBLevelDBBackingStore::open method in > IDBLevelDBBackingStore.cpp file, level DB will be opened in memory when > “pathBase” is empty. **** > > **è **If we open the level DB in the memory, its data might be lost when > browser or other web application finishes using the level DB. The data > persistency is not guaranteed in sys reboot. So I’d like to know why fifth > argument is null string rather than a path.**** > > ** > In chrome we don't use the path passed to the m_backend interface so we just left it empty. You can change it to something meaningful. In case you're wondering, this is how that open call proceeds in chrome: IDBFactory IDBFactoryBackendProxy WebIDBFactory IPC WebIDBFactoryImpl // passes a real path to IDBFactoryBackendImpl IDBFactoryBackendImpl ** > > Alec**** > > Thanks for your time to look into my questions. > > Best regards, > Jiyeon Kim**** > > ** ** > > _______________________________________________ > webkit-dev mailing list > [email protected] > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev**** > > > _______________________________________________ > webkit-dev mailing list > [email protected] > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev > >
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