RE: [Sparql4j-devel] Design issue: connection management and pooling

[Seaborne, A. <and...@hp...>]

-------- Original Message --------
> From: Janne Saarela <>
> Date: 15 November 2005 12:28
>=20
> Hi all
>=20
> Can I have some of your cpu time for thinking how we should manage
> connection objects in sparql4j project?=20
>=20
> As sparql currently does not support state management (cursors or
> anything of the sort), there is no need to manage state in the
> Connection object internally. =20
>=20
> How the connections are passed between Driver, Connection and
Statement
> (or PreparedStatement) classes is something we should design right so
> that eventual state management would be easier to add in the future. =20
>=20
> I am thinking that the Driver.getConnection() method could return
> nothing but a Connection object which internally manages HTTP
> connections to SPARQL servers. =20
>=20
> Once a (Prepared)Statement.execute() method (or variants of it) is
> executed, the actual protocol call is created within the Connection
> object. This would centralize HTTP code management to the Connection
> class leaving room for internal connection pool management if HTTP
> connections were e.g. persisted and left open for future calls.

Good idea - we *might* be able to get this for free by having swappable
HTP clients.  Maybe httpClient does the necessary work for use (although
this should not be a system prerequiste).
   =20
	Andy

>=20
> I don't see a reason to pool Connection objects in the Driver level at
> this time.=20
>=20
> Janne
> --
> Janne Saarela <janne.saarela at profium.com> Profium, Lars Sonckin
> kaari 12, 02600 Espoo, Finland=20
> Internet: http://www.profium.com
>=20
>=20
>=20
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