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org.apache.lucene.search

Class ParallelMultiSearcher

Implemented Interfaces:
java.rmi.Remote, Searchable
public class ParallelMultiSearcher
extends MultiSearcher
Implements parallel search over a set of Searchables.

Applications usually need only call the inherited search(Query) or search(Query,Filter) methods.

Constructor Summary

ParallelMultiSearcher(Searchable[] searchables)
Creates a searcher which searches searchables.

Method Summary

int
docFreq(Term term)
TODO: parallelize this one too
Query
rewrite(Query original)
TopDocs
search(Query query, Filter filter, int nDocs)
A search implementation which spans a new thread for each Searchable, waits for each search to complete and merge the results back together.
TopFieldDocs
search(Query query, Filter filter, int nDocs, Sort sort)
A search implementation allowing sorting which spans a new thread for each Searchable, waits for each search to complete and merges the results back together.
void
search(Query query, Filter filter, HitCollector results)
Lower-level search API.

Methods inherited from class org.apache.lucene.search.MultiSearcher

close, doc, docFreq, explain, getStarts, maxDoc, rewrite, search, search, search, searcherIndex, subDoc, subSearcher

Methods inherited from class org.apache.lucene.search.Searcher

getSimilarity, search, search, search, search, search, setSimilarity

Constructor Details

ParallelMultiSearcher

public ParallelMultiSearcher(Searchable[] searchables)
            throws IOException
Creates a searcher which searches searchables.

Method Details

docFreq

public int docFreq(Term term)
            throws IOException
TODO: parallelize this one too
Specified by:
docFreq in interface Searchable
Overrides:
docFreq in interface MultiSearcher

rewrite

public Query rewrite(Query original)
            throws IOException
Specified by:
rewrite in interface Searchable
Overrides:
rewrite in interface MultiSearcher

search

public TopDocs search(Query query,
                      Filter filter,
                      int nDocs)
            throws IOException
A search implementation which spans a new thread for each Searchable, waits for each search to complete and merge the results back together.
Specified by:
search in interface Searchable
Overrides:
search in interface MultiSearcher

search

public TopFieldDocs search(Query query,
                           Filter filter,
                           int nDocs,
                           Sort sort)
            throws IOException
A search implementation allowing sorting which spans a new thread for each Searchable, waits for each search to complete and merges the results back together.
Specified by:
search in interface Searchable
Overrides:
search in interface MultiSearcher

search

public void search(Query query,
                   Filter filter,
                   HitCollector results)
            throws IOException
Lower-level search API.

HitCollector.collect(int,float) is called for every non-zero scoring document.

Applications should only use this if they need all of the matching documents. The high-level search API (Searcher.search(Query)) is usually more efficient, as it skips non-high-scoring hits.

Specified by:
search in interface Searchable
Overrides:
search in interface MultiSearcher
Parameters:
query - to match documents
filter - if non-null, a bitset used to eliminate some documents
results - to receive hits TODO: parallelize this one too

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