Lucene example source code file (CachedFilter.xml)
The Lucene CachedFilter.xml source code
<?xml version="1.0" encoding="UTF-8"?> <FilteredQuery> <Query> <BooleanQuery fieldName="contents"> <Clause occurs="should"> <TermQuery>merger </Clause> <Clause occurs="mustnot"> <TermQuery >sumitomo </Clause> </BooleanQuery> </Query> <Filter> <!-- CachedFilter elements can contain any Query or Filter. CachedFilters are cached in an LRU Cache keyed on the contained query/filter object. Using this will speed up overall performance for repeated uses of the same expensive query/filter. The sorts of queries likely to benefit from caching need not necessarily be complex - e.g. simple TermQuerys with a large DF (document frequency) can be expensive on large indexes. A good example of this might be a term query on a field with only 2 possible values - "true" or "false". In a large index, querying or filtering on this field requires reading millions of document ids from disk which can more usefully be cached as a QueryFilter bitset. For Queries/Filters to be cached and reused the object must implement hashcode and equals methods correctly so that duplicate queries/filters can be detected in the cache. The CoreParser.maxNumCachedFilters property can be used to control the size of the LRU Cache established during the construction of CoreParser instances. --> <CachedFilter> <!-- Example query to be cached for fast, repeated use --> <TermQuery fieldName="contents">bank <!-- Alternatively, a filter object can be cached .... <RangeFilter fieldName="date" lowerTerm="19870409" upperTerm="19870412"/> --> </CachedFilter> </Filter> </FilteredQuery>
Other Lucene examples (source code examples)
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