DAO 's factory is right or not! URGENT 2004-07-15 - By Ben Hill
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> -- --Original Message-- --
> From: Manish Malhotra [mailto:manish.mmalhotra@(protected)]
> Sent: 15 July 2004 10:47
> To: J2EE-INTEREST@(protected)
> Subject: Re: DAO's factory is right or not! URGENT
>
>
> Thanks Ben,
>
> Means I can implement something like connection / thread pool
> for DAO's. And yes you are right that there is no performance
> by DAO caching. But just the Factory pattern I intorduced. So
> that there wod be less dependency between Beans & DAO's.
The factory pattern isn't dependant on storing the DAO in a map. The point I
tried to make is that you only ever have *one* DAO in the map.
>
> And Im not able to identify the methods of DAO which needs to
> be synchropnized. Ir there any property which I need to look
> in to the methods to identify.
It's arguably safer to have one DAO per request, so maintaining a pool of
DAOs and serving one out per request helps. The more thread-safety that you
can design into a system, generally the better.
>
> Im calling som private methods also in DAO and passing the
> connection object from one methods to another. Is there any
> issue in this?
Without looking at the code, I'm not sure - but you shouldn't hold on to a
connection for any longer than need be, and passing it about can leave it
unreleased if it gets held somewhere...
Cheers,
Ben
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