[hibernate-dev] hibernate-dev Digest, Vol 56, Issue 20

[Marc Schipperheyn]

I have a lot of experience with Bobo Browse. The code is well maintained and
performs well.
I don't have time to download and implement code examples, but if you have
working examples up somewhere, I'd be happy to take a look.

Vriendelijke groet,

Marc



On Mon, Feb 28, 2011 at 6:00 PM, <hibernate-dev-request at lists.jboss.org>wrote:

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> Today's Topics:
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>   1. [HSearch] Faceting feedback (Hardy Ferentschik)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 28 Feb 2011 16:13:43 +0100
> From: "Hardy Ferentschik" <hibernate at ferentschik.de>
> Subject: [hibernate-dev] [HSearch] Faceting feedback
> To: "hibernate-dev at lists.jboss.org" <hibernate-dev at lists.jboss.org>
> Message-ID: <op.vrmck5ewqxbac6 at sarmakand.lan>
> Content-Type: text/plain; charset=iso-8859-15; format=flowed;
>        delsp=yes
>
>
> Hi,
>
> I thought it would be great to get some feedback on my faceting work.
> You can see the latest on my Search fork -
> https://github.com/hferentschik/hibernate-search/commits/HSEARCH-667
>
> Technically I decided to use a simple custom Collector. I abandoned the
> idea for using bobo browse, since it did
> not really seem to fit our architecture and I am not sure how well
> maintained the code is.
> Within the custom Collector I am using Lucene's FieldCache to cache and
> collect the count values during facting
> (as a reminder, faceting for example means that I am searching for all
> cars or a certain make, but then also want
> to group the matching cars into their cubic capacity. See also -
> http://en.wikipedia.org/wiki/Faceted_search)
> Using the FieldCache is quite memory costly, but there are other ways to
> implement the faceting itself.
>
> At the moment I am mostly interested in the feedback around the public
> API. The public classes can be found in
> the package org.hibernate.search.query.facet -
>
> https://github.com/hferentschik/hibernate-search/tree/3a9877e2bbc47a8bd6e438dbbab56d93ac9101fd/hibernate-search/src/main/java/org/hibernate/search/query/facet
>
> The idea is to write a fulltext query as usual and then add/enable a facet:
>
> FacetRequest request = new SimpleFacetRequest( indexFieldName,
> FacetSortOrder.COUNT_DESC, false );
> TermQuery term = new TermQuery( new Term( "make", "honda" ) );
> FullTextQuery query = fullTextSession.createFullTextQuery( term, Car.class
> );
> query.enableQueryFacet( "foo", request );
>
> Then you run the query. This will enable the facet collector and after the
> query executed you get access to a map
> which maps FacetResults to the facet name. Each FacetResult contains a
> list of Facets which contain the actually
> field values and counts:
>
> Map<String, FacetResult> results = query.getFacetResults();
> FacetResult facetResult = results.get( "foo" );
> List<Facet> facetList = facetResult.getFacets();
> assertEquals( "Wrong facet count for facet ", 100, facetList.get( 0
> ).getCount() );
>
> More actual tests can be found here -
>
> https://github.com/hferentschik/hibernate-search/tree/3a9877e2bbc47a8bd6e438dbbab56d93ac9101fd/hibernate-search/src/test/java/org/hibernate/search/test/query/facet
>
> At the moment you are able to facet on simple (string) based values or on
> number ranges (eg price ranges 0 - 100, ...). For that I have created
> subclasses of
> FacetRequest - SimpleFacetRequest and RangeFacetRequest (a
> DateRangeFacetRequest might be interesting as well)
>
> Some concrete questions:
> * Atm, I am only exposing a programmatic API for creating FacetRequests. I
> guess we want to have annotations for this as well, right?
>   Would we keep the programmatic configuration as a public API?
> * I made the FacetRequest classes immutable atm, but this way I have a
> multitude of constructors catering for a whole range of parameters
>   (sort order, include zero counts, ...). Any opinions around immutable
> objects vs objects with setters for configuring options after creation.
>
> If course I am interested in any other feedback as well.
>
> --Hardy
>
>
>
>
>
>
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> End of hibernate-dev Digest, Vol 56, Issue 20
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>