Package org.apache.lucene.search

Class SearcherFactory

java.lang.Object

org.apache.lucene.search.SearcherFactory

public class SearcherFactory
extends Object

Factory class used by SearcherManager to create new IndexSearchers. The default implementation just creates an IndexSearcher with no custom behavior:

   public IndexSearcher newSearcher(IndexReader r) throws IOException {
     return new IndexSearcher(r);
   }
 

You can pass your own factory instead if you want custom behavior, such as:

• Setting a custom scoring model: IndexSearcher.setSimilarity(Similarity)
• Parallel per-segment search: IndexSearcher(IndexReader, Executor)
• Return custom subclasses of IndexSearcher (for example that implement distributed scoring)
• Run queries to warm your IndexSearcher before it is used. Note: when using near-realtime search you may want to also IndexWriterConfig.setMergedSegmentWarmer(IndexWriter.IndexReaderWarmer) to warm newly merged segments in the background, outside of the reopen path.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary

Constructors

Constructor	Description
SearcherFactory()

Method Summary

Modifier and Type	Method	Description
IndexSearcher	newSearcher(IndexReader reader, IndexReader previousReader)	Returns a new IndexSearcher over the given reader.

Methods inherited from class java.lang.Object

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

Constructor Detail

SearcherFactory

public SearcherFactory()

Method Detail

newSearcher

public IndexSearcher newSearcher(IndexReader reader,
                                 IndexReader previousReader)
                          throws IOException

Returns a new IndexSearcher over the given reader.

Parameters:

reader - the reader to create a new searcher for

previousReader - the reader previously used to create a new searcher. This can be null if unknown or if the given reader is the initially opened reader. If this reader is non-null it can be used to find newly opened segments compared to the new reader to warm the searcher up before returning.

Throws:

IOException