Re: hooks for supporting third party blobs? - Mailing list pgsql-general

From Alvaro Herrera
Subject Re: hooks for supporting third party blobs?
Date
Msg-id 20041207013057.GB25856@dcc.uchile.cl
Whole thread Raw
In response to hooks for supporting third party blobs?  (Eric Davies <Eric@barrodale.com>)
List pgsql-general
On Mon, Dec 06, 2004 at 05:11:21PM -0800, Eric Davies wrote:

> Is anyone aware of any hooks to support schemes such as ours, or has solved
> a similar problem?

There's RegisterXactCallback() and RegisterSubXactCallback() functions
that may be what you want.  They are called whenever a transaction or
subtransaction starts, commits, or aborts.  You could probably keep a
list of things modified during the transaction, so you can clean up at
transaction end.

(Much like the storage manager does: it only unlinks files for dropped
tables at transaction commit.)

Make sure to react appropiately at subtransaction abort ...

--
Alvaro Herrera (<alvherre[@]dcc.uchile.cl>)
"Si quieres ser creativo, aprende el arte de perder el tiempo"

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