> -----Original Message-----
> From: Scott Ganyo [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, April 03, 2002 4:44 PM
> To: 'Lucene Developers List'
> Subject: RE: Searcher/Reader/Writer Management
>
>
> (quotes clipped for brevity)
>
> > 1. Why don't we have as many control/manager object as index
> > we want to use?
> > 2. Why is it a static class with only static methods?
>
> That would destroy what this class is attempting to
> accomplish: Guarding
> the index resources so that you don't have to think about
> concurrency. If
> you could have multiple controllers, they would then have to somehow
> coordinate between themselves... making the class even more complex.
>
I mean we could have as many instance as many index (path or directory) we want to
manage. For example
IndexAccessControl iac = new IndexAccessControl(myPath);
Searcher searcher = iac.getSearcher();
> > 3. Couldn't we wrap the release logic into a
> > ControledSearcher (Yesterday I've writter CachedSearcher)?
>
> Nope. For example, in my application I need to hold onto a
> single Searcher
> during the course of a transaction... if I was forced to use
> a new Searcher
> for each query, I couldn't be guaranteed consistent results
> throughout the
> transaction.
You are not forced. You can hold reference to ControledSearcher as long you want. I
only suggest that developer should call
searcher.close()
instead of
IndexAccessControl.releaseSearcher(searcher)
>
> > 4. If I understand your code index can't be written while
> > there is opened searcher? Is it right? I don't understand
> > what is the connection between Reader and Writer instances on
> > the same index.
>
> You should be able to get a writer while searchers are in
> use, but not while
> a reader is in use. Did you see a place where this is not
> the case? I
> should have mentioned: In this scenario, Readers are assumed
> to be used for
> delete (since they can be), so a Writer cannot be retrieved
> while a Reader
> is open and vice versa.
>
Ok, I see.
>
> Scott
>
peter
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