[ http://issues.apache.org/jira/browse/LUCENE-534?page=all ]
Karl Wettin updated LUCENE-534:
-------------------------------
Attachment: se.snigel.lucene.crud.tar.gz
my CRUD pattern
> CRUD facade on top of Lucene
> ----------------------------
>
> Key: LUCENE-534
> URL: http://issues.apache.org/jira/browse/LUCENE-534
> Project: Lucene - Java
> Type: New Feature
> Reporter: Karl Wettin
> Priority: Minor
> Attachments: se.snigel.lucene.crud.tar.gz
>
> 29 mar 2006 kl. 15.43 Erik Hatcher wrote:
> Lazy loaded fields will be a nice addition to Lucene. I'm curious why the
> flag is set at indexing time rather than it being something that is
> controlled during retrieval somehow. I'm not sure what that API would look
> like, but it seems its a decision to be addressed during searching and
> reading of an index rather than during indexing itself.
> I reply:
> Lazy is nice. Thumbs up!
> But.
> I believe the field text persistency feature foolishly lead people to choose
> Lucene for persistency.
> I would prefer if we had identity safe Document and a CRUD pattern that bound
> them with an object instance. A standard implementation could act just as the
> current fields do.
> Perhaps this has already been discussed in the past.
> Perhaps I should settle with having a facade around Lucene rather than inside
> to save a few clock ticks.
> Perhaps everybody is not an OO-fundamentalist.
> Lucene to me is a set of tokens I can search to find my object instances
> already residing in memory. I use Prevayler for object persistency.
> As things I wrote required more indices I became sick keeping track of
> writers, searcher, readers, documents, et.c.. So I wrote a facade on top of
> Lucene that takes care of all the for me.
> It all comes down to four classes:
> final IndexHandler - one instance per Directory. Builds the index.
> CRUD<E extends Tokenized > - Create, Read, Update, Delete and searches.
> Tokenized<E id class> - Any class that shoud be accessible from a Lucene
> search.
> Hit<E extends Tokenized>
> In the end, I do something like this:
> LinkedList<Hit<MyClass>> hits = getCRUD().search(new TermQuery(new
> Term("foo", "bar")), getIndexHandler().getSearcher());
> I have put it on the Jira in case anyone is interested. Made a small example.
> With some refactoring the pattern would support other implementations than
> Lucene.
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