org.apache.lucene.search

Class ParallelMultiSearcher

java.lang.Object

org.apache.lucene.search.Searcher

org.apache.lucene.search.MultiSearcher

org.apache.lucene.search.ParallelMultiSearcher

All Implemented Interfaces:

Searchable

public class ParallelMultiSearcher
extends MultiSearcher

Implements parallel search over a set of Searchables.

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

Constructor Summary

Constructors

Constructor and Description
ParallelMultiSearcher(Searchable[] searchables) Creates a searchable which searches searchables.

Method Summary

Methods

Modifier and Type	Method and Description
int	docFreq(Term term) TODO: parallelize this one too
Query	rewrite(Query original) Expert: called to re-write queries into primitive queries.
void	search(Weight weight, Filter filter, Collector collector) Lower-level search API.
TopDocs	search(Weight weight, 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(Weight weight, 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.

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

close, createWeight, doc, doc, explain, getSearchables, getStarts, maxDoc, subDoc, subSearcher

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

docFreqs, explain, getSimilarity, search, search, search, search, search, search, search, search, search, search, search, search, setSimilarity

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ParallelMultiSearcher

public ParallelMultiSearcher(Searchable[] searchables)
                      throws IOException

Creates a searchable which searches searchables.

Throws:

IOException

Method Detail

docFreq

public int docFreq(Term term)
            throws IOException

TODO: parallelize this one too

Specified by:

docFreq in interface Searchable

Overrides:

docFreq in class MultiSearcher

Throws:

IOException

See Also:

IndexReader.docFreq(Term)

search

public TopDocs search(Weight weight,
             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 class MultiSearcher

Throws:

IOException

search

public TopFieldDocs search(Weight weight,
                  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 class MultiSearcher

Throws:

IOException

search

public void search(Weight weight,
          Filter filter,
          Collector collector)
            throws IOException

Lower-level search API.

Collector.collect(int) is called for every matching 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 class MultiSearcher

Parameters:

weight - to match documents

filter - if non-null, a bitset used to eliminate some documents

collector - to receive hits TODO: parallelize this one too

Throws:

IOException

rewrite

public Query rewrite(Query original)
              throws IOException

Description copied from interface: Searchable

Expert: called to re-write queries into primitive queries.

Specified by:

rewrite in interface Searchable

Overrides:

rewrite in class MultiSearcher

Throws:

IOException