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Re: Starting work on Indexed DB v2 spec - feedback wanted

From: James Halliday <substack@gmail.com>
Date: Thu, 17 Apr 2014 17:56:26 -0700
Message-ID: <CAPWoRudBKsZLqR0q+DiSdmoLA6bWoa1BEhAU3nbb5U0Dh+BPjg@mail.gmail.com>
To: public-webapps@w3.org
Things I think are important:
* asynchronous get/put
* iterators on sorted keys (so we can implement efficient indexes and
nice streaming abstractions)
* batch put/del - not sure if it already has this, but these are super
necessary for implementing custom indexing schemes
* binary keys - combined with sorted key iterators, with binary keys
you can do some really interesting things in userspace with sorting
like typewise: https://www.npmjs.org/package/typewise
* binary values - store bulk data without the overhead of string conversion
* mutation observers - a simple event-based API that emits objects
with { type: 'put|del|batch', key: '...', value: '...' } would do fine
here, like leveldb. This might be a good place for modules to provide
hooks for indexing similar to `ev.preventDefault()` for dom elements.
After preventing the default mutation, the indexing modules could do
batch put/del into the database on their own and then have another
function to indicate back to the caller that triggered the mutation in
the first place that the operation failed or succeeded. Here is a
related module to look at for API inspiration:

Things I don't particularly care about:
* promises
* batched gets
* existence checks
* transactions - these seem like complications

These things should NOT be implemented:
* full text search - This is a very specific kind of index. Just give
us the primitives to implement general-purpose indexes instead.
* IDBKeyRange boolean operators - give userspace enough primitives to
implement indexing ourselves instead of baking in a DSL

A good starting point as Raynos has already mentioned is the leveldown
api, which has proved sufficient to sustain a huge ecosystem of
packages that implement features of traditional databases in a highly
modular way: https://github.com/rvagg/node-leveldown
Received on Friday, 18 April 2014 06:43:52 UTC

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