On Thursday 01 August 2002 17:32, Peter Royal wrote:
> On Thursday 01 August 2002 11:23 am, Torsten Curdt wrote:
> > ...but I was more thinking non-limited pools that exists only to reduce
> > object creations. Wouldn't it make sense there?
>
> Berin's comments explain that one better than I...
>
> > Thinking about limited pools... would it be cool to have a fall-back
> > mechanism? Just a week ago it took me quite some time find out that a
> > component did not release a jdbc connection.
> >
> > With this fallback mechanism I could immediatly have found in the log
> > file something like "WARN: releasing unused component..." without testing
> > the pool against it's limit.
>
> this is a pilfered idea i read somewhere else.. maybe even on this list...
must have missed that one...
> when a Connection is gotten from the pool, create a new Exception but don't
> throw it. If a connection is gotten from the pool, used, and then not
> closed, throw that exception upon finalization (which you should be able to
> force by shutting the system down).
>
> .. thats the rough idea..
You mean modifing the e.g. the Connection implementation? This would work for
a connection since it has it's close() methode which could remove the
exception again.
The problem is that the Poolable needs to know about it's state (in
use/released) to throw an Exception on finalization.
Is there something that is definitly is called when a component is looked up
or released? One could mime it with compose/dispose I guess...
Maybe one should always implement Poolables like this?
public class myclass implements Poolable, Composable, Disposable {
private boolean released = true;
public void compose(..) {
released = false;
}
public void dispose(..) {
released = true;
}
protected void finalize() {
if (!released) throw new UnreleasedComponentException("..");
}
}
But this may be a misuse of the current lifecycle interfaces...
What do you guys think?
--
Torsten
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