Examples of org.apache.lucene.search.CachingWrapperFilter$DeletesMode

org.apache.lucene.search.CachingWrapperFilter
Expert: Specifies how new deletions against a reopened reader should be handled.
The default is IGNORE, which means the cache entry will be re-used for a given segment, even when that segment has been reopened due to changes in deletions. This is a big performance gain, especially with near-real-timer readers, since you don't hit a cache miss on every reopened reader for prior segments.

However, in some cases this can cause invalid query results, allowing deleted documents to be returned. This only happens if the main query does not rule out deleted documents on its own, such as a toplevel ConstantScoreQuery. To fix this, use RECACHE to re-create the cached filter (at a higher per-reopen cost, but at faster subsequent search performance), or use DYNAMIC to dynamically intersect deleted docs (fast reopen time but some hit to search performance).

    if (qb != null)
    {
      cachedFilter = new QueryWrapperFilter(q);
    } else
    {
      cachedFilter = new CachingWrapperFilter(f);
    }


    filterCache.put(cacheKey, cachedFilter);
    return cachedFilter;
  }

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    IndexSearcher searcher = newSearcher(reader);
  
    Query query = new TermQuery(new Term("none", "none"));
  
    QueryWrapperFilter queryFilter = new QueryWrapperFilter(query);
    CachingWrapperFilter cachingFilter = new CachingWrapperFilter(queryFilter);
  
    searcher.search(query, cachingFilter, 1);
  
    CachingWrapperFilter cachingFilter2 = new CachingWrapperFilter(queryFilter);
    Filter[] chain = new Filter[2];
    chain[0] = cachingFilter;
    chain[1] = cachingFilter2;
    ChainedFilter cf = new ChainedFilter(chain);

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    group = groups.groups[3];
    compareGroupValue(null, group);
    assertEquals(1, group.scoreDocs.length);
    assertEquals(6, group.scoreDocs[0].doc);


    Filter lastDocInBlock = new CachingWrapperFilter(new QueryWrapperFilter(new TermQuery(new Term("groupend", "x"))));
    groupingSearch = new GroupingSearch(lastDocInBlock);
    groups = groupingSearch.search(indexSearcher, null, new TermQuery(new Term("content", "random")), 0, 10);


    assertEquals(7, groups.totalHitCount);
    assertEquals(7, groups.totalGroupedHitCount);

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    IndexSearcher searcher = newSearcher(reader);
  
    Query query = new TermQuery(new Term("none", "none"));
  
    QueryWrapperFilter queryFilter = new QueryWrapperFilter(query);
    CachingWrapperFilter cachingFilter = new CachingWrapperFilter(queryFilter);
  
    searcher.search(query, cachingFilter, 1);
  
    CachingWrapperFilter cachingFilter2 = new CachingWrapperFilter(queryFilter);
    Filter[] chain = new Filter[2];
    chain[0] = cachingFilter;
    chain[1] = cachingFilter2;
    ChainedFilter cf = new ChainedFilter(chain);

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    if (qb != null)
    {
      cachedFilter = new QueryWrapperFilter(q);
    } else
    {
      cachedFilter = new CachingWrapperFilter(f);
    }


    filterCache.put(cacheKey, cachedFilter);
    return cachedFilter;
  }

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