#119: Key-value interface: optional pre-write

[gsvarovsky]

Here is a simple proposal for the key-value interface discussed in #119 .

On the basis that the creator of the quadstore already has access to the raw backend, this proposal does not try to prevent:

• key collisions with the quad indexes, or
• abuse of the batch by calling write or clear.

Happy to discuss and add tests/docs when ready.

[jacoscaz]

This seems quite good to me already. I'll just leave a couple of nitpick-y comments.

How would you handle reading those custom entries? The Quadstore class already exposes the AbstractLevelDOWN instance through its .db property. Is that enough? I think it would make sense to just leave it at that, without further wrapping or methods. There's a nice symmetry in having direct access to leveldb both at the read and batch stages.

[jacoscaz]

In addition to my comments:

• a mention to these hooks in README.md
• a dedicated test file for these hooks, with one unit test per each hook, preferably using quadstore.db.get() to verify writes

After that I think we should be all set for a new beta.

[gsvarovsky]

How would you handle reading those custom entries?

I agree – just use the db, or even just read from the AbstractLevelDOWN you supplied in the first place.

[gsvarovsky]

I propose that I try this new interface in m-ld, to see if it solves my problem neatly, before we commit to it. It will mean a bit of a delay. Or are you really keen to get the Beta out?

[jacoscaz]

I propose that I try this new interface in m-ld, to see if it solves my problem neatly, before we commit to it. It will mean a bit of a delay. Or are you really keen to get the Beta out?

I think this is a really nice and useful PR that complements having direct access to the AbstractLevelDOWN instance, adding to the extendability of quadstore by offering atomic writes of quads + custom data.

I am not in a rush, so it’s really up to you, but I would still like to merge this on its own merit when it’s ready.

[jacoscaz]

@gsvarovsky fantastic work - do you require a beta right away?

[gsvarovsky]

Great! Not right away. In the next few days would be great, I have one more optimisation in m-ld to work on before I do another pre-release myself.

[jacoscaz]

All right, feel free to ping me anytime about it. Also, how did you find hacking on quadstore?

[gsvarovsky]

A lot more fun than doing the market research I've been putting off...

It's a great project, you should be proud!