However, see Wiki HowToContribute: http://wiki.apache.org/jakarta-
lucene/HowToContribute if you wish to donate your code.
-Grant
On Feb 25, 2007, at 6:56 PM, oramas martín wrote:
Hello,
As you probably know, the HitCollector-based search API is not
meant to work
remotely, because it will generate a RPC-callback for every non-
zero score.
There is another problem with MultiSearcher-HitCollector-based
search which
knows nothing about mix HitCollector based searches (not to say it has
hardcode the way to mix TopDocs for the score and for the Sort
searches).
Also the ParallelMultiSearcher inherits this problems and is unable to
parallelize the HitCollector-based searcher.
A final problem with the HitCollector-based search is related to
the lost of
a limit in the results, as the Hits class implements thought the
getMoreDocs() function, and lazy loading and caching of documents
it does.
To solve those problems it is necessary a factory
(HitCollectorSource) able
to generate collectors for single (SingleHitCollector) an multi
(MultiHitCollector) searches, and a new search method in the
Searchable interface for it. To avoid modifications to the lucene
core, the
later requirement is NOT IMPLEMENTED in the library I have just
created.
Instead, an ugly solution, a wrapper for those searchers
(SearcherHCSourceWrapper) and a Filter wrapper
(FilterHitCollectorSource) to
carry the factory-based searches, is provided.
Each collector is based in a two steps sequence, one for collecting
hits or
subsearcher results, and another for generating the final result.
Also, just in case you don't want to add a wrapper to each searcher
of your
project, there is an adapted version of IndexSearcher,
MultiSearcher and
ParallelMultiSearcher (only for version 2.1) modified exactly the
same way
the wrapper class SearcherHCSourceWrapper does. Just put them in your
class-path (before the Lucene core jar) and you will be using the new
collector interfaces without modifying your code.
There are some unit testing (copied and adapted from the Lucene
2.1distribution).
See http://sourceforge.net/projects/lucollector/ for the jar files
and the
code.
If you find it interesting to complement the Lucene project, tell
me how to
put it in the contribution area.
Regards,
José L. Oramas
--------------------------
Grant Ingersoll
Center for Natural Language Processing
http://www.cnlp.org
Read the Lucene Java FAQ at http://wiki.apache.org/jakarta-lucene/
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