[webkit-dev] PageGroups (and the localStorage being stored in it)

Jeremy Orlow jorlow at chromium.org
Thu May 7 20:49:14 PDT 2009

One more question: are there any use cases where setGroupName could occur
after window.localStorage() had been called?  If so, this seems like it
could be a problem since a Storage object is only created on the first call
to DOMWindow::localStorage() and then it's cached as a member variable in
DOMWindow.  This would mean that any page that calls window.localStorage()
before setGroupName is called would not be using the same localStorageArea
as a page that calls setGroupName first.

Also, is there any significance to setGroupName being reset to nothing
during Page's destructor?


On Thu, May 7, 2009 at 8:07 PM, Jeremy Orlow <jorlow at chromium.org> wrote:

> On Thu, May 7, 2009 at 5:25 PM, Darin Adler <darin at apple.com> wrote:
>> On May 7, 2009, at 4:56 PM, Jeremy Orlow wrote:
>>  I'm continuing to work on https://bugs.webkit.org/show_bug.cgi?id=25376 and
>>> noticed that the map of origins to localStorageAreas is owned by the
>>> PageGroup class.  I'm having a bit of trouble understanding what exactly
>>> page groups are used for.
>> PageGroup exists so you can have multiple web pages in a single
>> application that share state, including frame namespace, such as the
>> multiple windows and tabs in Safari.
>> Separate page groups allow other web views to be separate, allowing the
>> same application to use WebKit for things that should be isolated from web
>> browsing; for example Safari on Windows uses web views for things like
>> Preferences and text input.
>> This is exposed as part of the WebKit API on Mac OS X, with the
>> setGroupName: method.
>> It may be a useless concept for Chromium but it’s critical on Mac OS X.
> Didn't mean to imply they were useless, at all.  Was just trying to
> understand their use.
> Thanks!
> J
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