Examples of org.apache.lucene.search.SearcherFactory

org.apache.lucene.search.SearcherFactory
Factory class used by {@link SearcherManager} and {@link NRTManager} tocreate 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: {@link IndexSearcher#setSimilarity(Similarity)}
- Parallel per-segment search: {@link IndexSearcher#IndexSearcher(IndexReader,ExecutorService)}
- 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 {@link IndexWriterConfig#setMergedSegmentWarmer(IndexWriter.IndexReaderWarmer)} to warmnewly merged segments in the background, outside of the reopen path.
@lucene.experimental


  /** Creates near-real-time searcher and taxonomy reader
   *  from the corresponding writers. */
  public SearcherTaxonomyManager(IndexWriter writer, boolean applyAllDeletes, SearcherFactory searcherFactory, DirectoryTaxonomyWriter taxoWriter) throws IOException {
    if (searcherFactory == null) {
      searcherFactory = new SearcherFactory();
    }
    this.searcherFactory = searcherFactory;
    this.taxoWriter = taxoWriter;
    DirectoryTaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoWriter);
    current = new SearcherAndTaxonomy(SearcherManager.getSearcher(searcherFactory, DirectoryReader.open(writer, applyAllDeletes)),

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    simpleTimer.stop("writerOpen");
    simpleTimer.start("nrtSetup");
    _recorder = new TransactionRecorder(shardContext);
    _recorder.replay(_writer);


    _searcherFactory = new SearcherFactory() {
      @Override
      public IndexSearcher newSearcher(IndexReader reader) throws IOException {
        return new IndexSearcherClosableNRT(reader, searchExecutor, _nrtManagerRef, _directory);
      }
    };

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      locks[i] = new Object();
    }


    final AtomicLong nextVersion = new AtomicLong();


    final SearcherManager mgr = new SearcherManager(w.w, true, new SearcherFactory());


    final Long missingValue = -1L;


    final LiveFieldValues<IndexSearcher,Long> versionValues = new LiveFieldValues<IndexSearcher,Long>(mgr, missingValue) {
      @Override

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   * uses can tolerate seeing some deleted docs, since
   * reopen time is faster if deletes need not be applied. */
  public NRTManager(TrackingIndexWriter writer, SearcherFactory searcherFactory, boolean applyAllDeletes) throws IOException {
    this.writer = writer;
    if (searcherFactory == null) {
      searcherFactory = new SearcherFactory();
    }
    this.searcherFactory = searcherFactory;
    current = SearcherManager.getSearcher(searcherFactory, DirectoryReader.open(writer.getIndexWriter(), applyAllDeletes));
  }

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  /** Creates near-real-time searcher and taxonomy reader
   *  from the corresponding writers. */
  public SearcherTaxonomyManager(IndexWriter writer, boolean applyAllDeletes, SearcherFactory searcherFactory, DirectoryTaxonomyWriter taxoWriter) throws IOException {
    if (searcherFactory == null) {
      searcherFactory = new SearcherFactory();
    }
    this.searcherFactory = searcherFactory;
    this.taxoWriter = taxoWriter;
    DirectoryTaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoWriter);
    current = new SearcherAndTaxonomy(SearcherManager.getSearcher(searcherFactory, DirectoryReader.open(writer, applyAllDeletes)),

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    IndexWriter writer = getWriter(directory);


    ReferenceManager<IndexSearcher> mgr = new SearcherManager(writer,
                                                              true,
                                                              new SearcherFactory());


    TrackingIndexWriter mgrWriter = new TrackingIndexWriter(writer);


    IndexSearcher searcher = mgr.acquire();

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    IndexWriter writer = getWriter(directory);


    ReferenceManager<IndexSearcher> mgr = new SearcherManager(writer,
                                                              true,
                                                              new SearcherFactory());


    IndexSearcher searcher = mgr.acquire();


    TopDocs topDocs = searcher.search(new TermQuery(new Term("foo", "0")),
                                      100);

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    IndexWriter writer = getWriter(directory);


    ReferenceManager<IndexSearcher> mgr = new SearcherManager(writer,
                                                              true,
                                                              new SearcherFactory());


    IndexSearcher searcher = mgr.acquire();


    TopDocs topDocs = searcher.search(new TermQuery(new Term("foo", "0")),
                                      100);

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  /** Creates near-real-time searcher and taxonomy reader
   *  from the corresponding writers. */
  public SearcherTaxonomyManager(IndexWriter writer, boolean applyAllDeletes, SearcherFactory searcherFactory, DirectoryTaxonomyWriter taxoWriter) throws IOException {
    if (searcherFactory == null) {
      searcherFactory = new SearcherFactory();
    }
    this.searcherFactory = searcherFactory;
    this.taxoWriter = taxoWriter;
    DirectoryTaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoWriter);
    current = new SearcherAndTaxonomy(SearcherManager.getSearcher(searcherFactory, DirectoryReader.open(writer, applyAllDeletes)), taxoReader);

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   * {@link #maybeRefresh()} in the same thread. Otherwise it could lead to an
   * unsync'd {@link IndexSearcher} and {@link TaxonomyReader} pair.
   */
  public SearcherTaxonomyManager(Directory indexDir, Directory taxoDir, SearcherFactory searcherFactory) throws IOException {
    if (searcherFactory == null) {
      searcherFactory = new SearcherFactory();
    }
    this.searcherFactory = searcherFactory;
    DirectoryTaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);
    current = new SearcherAndTaxonomy(SearcherManager.getSearcher(searcherFactory, DirectoryReader.open(indexDir)), taxoReader);
    this.taxoWriter = null;

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