[webkit-dev] Queries regarding indexed db implementation

[Joshua Bell]

On Thu, May 3, 2012 at 2:04 AM, Jiyeon Kim <jiyeon0402.kim at samsung.com>wrote:

> On Thursday, May 03, 2012 at 1:59AM, Alec Flett alecflett at chromium.orgwrote:
> ****
>
> 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-memory only storage can be used for a browser's equivalent of
"incognito" mode.

>  **
>
>  Alec****
>
> Thanks for your time to look into my questions.
>
> Best regards,
> Jiyeon Kim****
>
> ** **
>
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