Package org.apache.solr.search

Class DocValuesIteratorCache

java.lang.Object

org.apache.solr.search.DocValuesIteratorCache

public class DocValuesIteratorCache
extends Object

A helper class for random-order value access over docValues (such as in the case of useDocValuesAsStored). This class optimizes access by reusing DocValues iterators where possible, and by narrowing the scope of DocValues per-field/per-segment (shortcircuiting attempts to `advance()` to docs that are known to have no value for a given field).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DocValuesIteratorCache.FieldDocValuesSupplier	Supplies (and coordinates arbitrary-order value retrieval over) docValues iterators for a particular field, encapsulating the logic of iterator creation, reuse/caching, and advancing.

Constructor Summary

Constructors

Constructor	Description
DocValuesIteratorCache(SolrIndexSearcher searcher)	Construct an instance used to optimize random-order DocValues iterator access for the specified searcher.
DocValuesIteratorCache(SolrIndexSearcher searcher, boolean cache)	Construct an instance used to optimize random-order DocValues iterator access for the specified searcher.

Method Summary

Modifier and Type	Method	Description
DocValuesIteratorCache.FieldDocValuesSupplier	getSupplier(String fieldName)

Methods inherited from class java.lang.Object

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

Constructor Detail

DocValuesIteratorCache

public DocValuesIteratorCache(SolrIndexSearcher searcher)

Construct an instance used to optimize random-order DocValues iterator access for the specified searcher.

DocValuesIteratorCache

public DocValuesIteratorCache(SolrIndexSearcher searcher,
                              boolean cache)

Construct an instance used to optimize random-order DocValues iterator access for the specified searcher.

Parameters:

searcher - the associated searcher

cache - if false, caching is disabled (useful mainly for single-field, single-doc access).

Method Detail

getSupplier

public DocValuesIteratorCache.FieldDocValuesSupplier getSupplier(String fieldName)