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Re: [Bug 11280] New: IDBFactory.databases doesn't work

From: Jeremy Orlow <jorlow@chromium.org>
Date: Thu, 11 Nov 2010 15:11:38 +0300
Message-ID: <AANLkTikmMLXiwhkxu3Xioa8ztG=VitGaYCS+f21qyA3L@mail.gmail.com>
To: public-webapps WG <public-webapps@w3.org>
I think it's useful and it's one of the things I recall people asking for
early on, but I agree it's flawed as is.  I guess we should just remove it
for now and come back to it later based on demand.

On Wed, Nov 10, 2010 at 1:49 AM, <bugzilla@jessica.w3.org> wrote:

> http://www.w3.org/Bugs/Public/show_bug.cgi?id=11280
>
>           Summary: IDBFactory.databases doesn't work
>           Product: WebAppsWG
>           Version: unspecified
>          Platform: PC
>        OS/Version: All
>            Status: NEW
>          Severity: normal
>          Priority: P2
>         Component: Indexed Database API
>        AssignedTo: dave.null@w3.org
>        ReportedBy: jonas@sicking.cc
>         QAContact: member-webapi-cvs@w3.org
>                CC: mike@w3.org, public-webapps@w3.org
>
>
> I've somehow missed this until now, but apparently IDBFactory has a
> .databases
> property.
>
> While I could see the use for this, it can't be implemented in a non-racy
> way.
> The problem is that other processes or threads can create and delete
> databases
> at any time, so there is no way to guarantee that a database which existed
> when
> .databases is checked, will exist a few milliseconds later when the
> knowledge
> of a database's existence is used. For example
>
> if (indexedDB.databases.contains("hello")) {
>  indexedDB.open("hello").onsuccess = ...;
> }
>
> has a race condition.
>
> Another problem is that it can't be implemented without blocking the main
> thread while going off to another thread or process where the indexedDB
> implementation lives. It'll likely also require synchronous IO to get the
> list
> of databases from file.
>
> I suggest we simply remove it for now.
>
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Received on Thursday, 11 November 2010 12:12:28 GMT

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