On Fri, Dec 2, 2011 at 3:45 PM, Dmytrii Nagirniak <dna...@gmail.com> wrote:
>
> On 03/12/2011, at 12:50 AM, Rick Bullotta wrote:
>
> > I also agree with you that it would be nice to have transaction support
> over a remote API, but that's not a trivial thing to accomplish in a web
> scenario when there is not any "thread affinity" or even necessarily
> "server affinity" between requests that occur within a transaction.
> Knowing when to abandon a pending transaction in a scenario where the
> client(s) do not maintain a persistent connection is also quite challenging.
>
> You just meant to say that HTTP is stateless? :)
> I proposed one solution in the other thread.
>
> Basically:
> 1. you POST to /transactions?timeout=1000 to request a start of a
> transaction.
> 2. The server returns a transaction id for the client to use.
> 3. Client can PUT /transactions/1234/commit|rollback
> 4. Otherwise server rolls it back after timeout (which may default to 1
> second and can't be longer that configured).
>
> It has additional benefit that you can combine transaction with batching:
>
> 1. GET /nodes/123
> 2. POST /transactions/
> 3. POST /batch - update everything in a batch, including the transaction
> itself.
>
> Thus additional request to commit/rollback the transaction is not even
> necessary as in can be batched.
>
This is similar to the approach we're looking at, except interaction
currently looks like:
POST /tx
200: 1
POST /tx/1/node {"name":"Steven"}
201
POST /tx/1/batch [blah blah]
200
PUT /tx/1/state "COMMITTED"
/jake
>
>
> > One possibility might be to leverage another RPC mechanism or perhaps
> even something like Web Sockets in the not too distant future. But I think
> the goal of a language neutral binding also needs to be preserved if
> possible.
> HTTP has its advantages. It can be heavily cached by reverse-proxy for
> example :)
>
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--
Jacob Hansson
Phone: +46 (0) 763503395
Twitter: @jakewins
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