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RE: IndexedDB TPAC agenda

From: Pablo Castro <Pablo.Castro@microsoft.com>
Date: Tue, 2 Nov 2010 10:48:57 +0000
To: Pablo Castro <Pablo.Castro@microsoft.com>, Jeremy Orlow <jorlow@chromium.org>, Jonas Sicking <jonas@sicking.cc>
CC: "public-webapps@w3.org" <public-webapps@w3.org>
Message-ID: <F753B2C401114141B426DB383C8885E06214C1E0@TK5EX14MBXC128.redmond.corp.microsoft.com>
To hit the ground running on this, here is a consolidated list of issues coming both from the thread below and various pending bugs/discussions we've had. I picked an arbitrary order and grouping, feel free to tweak in any way.

- keys (arrays as keys, compound keys, general keypath restrictions)
- index keys (arrays as keys, empty values, general keypath restrictions)
- internationalization (collation specification, collation algorithm)
- quotas (how do apps request more storage, is there a temp/permanent distinction?)
- error handling (propagation, relationship to window.error, db scoped event handlers, errors vs return empty values)
- blobs (be explicit about behavior of blobs in indexeddb objects)
- transactions error modes (abort-on-unwind in error conditions; what happens when user leaves the page with pending transactions?)
- transactions isolation/concurrent aspects
- transactions scopes (dynamic support)
- synchronous api


-----Original Message-----
From: public-webapps-request@w3.org [mailto:public-webapps-request@w3.org] On Behalf Of Pablo Castro
Sent: Monday, November 01, 2010 10:39 PM
To: Jeremy Orlow; Jonas Sicking
Cc: public-webapps@w3.org
Subject: RE: IndexedDB TPAC agenda

A few other items to add to the list to discuss tomorrow:

- Blobs support: have we discussed explicitly how things work when an object has a blob (file, array, etc.) as one of its properties?
- Close on collation and international support
- How do applications request that they need more storage? And related to this, at some point we discussed temporary vs permanent stores. Close on the whole story of how space is managed.
- Database-wide exception handlers

Looking forward to the discussion tomorrow.


From: public-webapps-request@w3.org [mailto:public-webapps-request@w3.org] On Behalf Of Jeremy Orlow
Sent: Monday, November 01, 2010 1:34 PM
To: Jonas Sicking
Cc: public-webapps@w3.org
Subject: Re: IndexedDB TPAC agenda

On Mon, Nov 1, 2010 at 12:23 PM, Jonas Sicking <jonas@sicking.cc> wrote:
On Mon, Nov 1, 2010 at 5:13 AM, Jeremy Orlow <jorlow@chromium.org> wrote:
> On Mon, Nov 1, 2010 at 11:53 AM, Jonas Sicking <jonas@sicking.cc> wrote:
>> On Mon, Nov 1, 2010 at 4:40 AM, Jeremy Orlow <jorlow@chromium.org> wrote:
>> > What items should we try to cover during the f2f?
>> > On Mon, Nov 1, 2010 at 11:08 AM, Jonas Sicking <jonas@sicking.cc> wrote:
>> >>
>> >> > P.S. I'm happy to discuss all of this f2f tomorrow rather than over
>> >> > email
>> >> > now.
>> >>
>> >> Speaking of which, would be great to have an agenda. Some of the
>> >> bigger items are:
>> >>
>> >> * Dynamic transactions
>> >> * Arrays-as-keys
>> >> * Arrays and indexes (what to do if the keyPath for an index evaluates
>> >> to an array)
>> >> * Synchronous API
>> >
>> > * Compound keys.
>> > * What should be allowed in a keyPath.
>> Aren't "compound keys" same as "arrays-as-keys"?
> Sorry, I meant to say compound indexes.
> We've talked about using indexes in many different ways--including compound
> indexes and allowing keys to include indexes.  I assumed you meant the
> latter....?
I'm lost as to what you're saying here. Could you elaborate? Are you
saying "index" when you mean "array" anywhere?

oops.  Yes, I meant to say: "We've talked about using arrays in many different ways--including compound indexes and allowing keys to include arrays.  I assumed you meant the latter....?"
>> * What should happen if an index's keyPath points to a property which
>> doesn't exist or which isn't a valid key-value? (same general topic as
>> "arrays and indexes" above)
> We've talked about this several times.  It'd be great to settle on something
> once and for all.

>> * What happens if the user leaves a page in the middle of a
>> transaction? (this might be nice to tackle since there'll be lots of
>> relevant people in the room)
> I'm pretty sure this is simple: if there's an onsuccess/onerror handler that
> has not yet fired (or we're in the middle of firing), then you abort the
> transaction.  If not, the behavior is undefined (because there's no way the
> app could have observed the difference anyway).  The aborting behavior is
> necessary since the user could have planned to execute additional commands
> atomically in the handler.
There is also the option to let the transaction finish. They should be
short-lived so it shouldn't be too bad.

I.e. keep the page alive for a bit longer in the background or something that blocks page unload?  Is there precedent for this elsewhere?  This sounds pretty complicated to get right both in terms of implementation and speccing.  Let's chat about it though.
>> * Error handling
> What do you mean by this?
How to handle exceptions in various places. Where (error) events
propagate. How does it relate to window.onerror. What happens if you
do/don't call preventDefault on the error event?

Sounds good.
Received on Tuesday, 2 November 2010 10:49:35 UTC

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