org.apache.lucene.search

クラス XUsageTrackingQueryCachingPolicy

java.lang.Object

org.apache.lucene.search.XUsageTrackingQueryCachingPolicy

すべての実装されたインタフェース:

org.apache.lucene.search.QueryCachingPolicy

public final class XUsageTrackingQueryCachingPolicy
extends Object
implements org.apache.lucene.search.QueryCachingPolicy

A QueryCachingPolicy that tracks usage statistics of recently-used filters in order to decide on which filters are worth caching. It also uses some heuristics on segments, filters and the doc id sets that they produce in order to cache more aggressively when the execution cost significantly outweighs the caching overhead.

ネストされたクラスのサマリー

インタフェースから継承されたネストされたクラス/インタフェース org.apache.lucene.search.QueryCachingPolicy

org.apache.lucene.search.QueryCachingPolicy.CacheOnLargeSegments

フィールドのサマリー

インタフェースから継承されたフィールド org.apache.lucene.search.QueryCachingPolicy

ALWAYS_CACHE

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
XUsageTrackingQueryCachingPolicy() Create a new instance with an history size of 256.
XUsageTrackingQueryCachingPolicy(int minIndexSize, float minSizeRatio, int historySize) Create a new instance.

メソッドのサマリー

修飾子とタイプ	メソッドと説明
protected int	minFrequencyToCache(org.apache.lucene.search.Query query) For a given query, return how many times it should appear in the history before being cached.
void	onUse(org.apache.lucene.search.Query query)
boolean	shouldCache(org.apache.lucene.search.Query query, org.apache.lucene.index.LeafReaderContext context)

クラスから継承されたメソッド java.lang.Object

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

コンストラクタの詳細

XUsageTrackingQueryCachingPolicy

public XUsageTrackingQueryCachingPolicy(int minIndexSize,
                                        float minSizeRatio,
                                        int historySize)

Create a new instance.

パラメータ:

minIndexSize - the minimum size of the top-level index

minSizeRatio - the minimum size ratio for segments to be cached, see QueryCachingPolicy.CacheOnLargeSegments

historySize - the number of recently used filters to track

XUsageTrackingQueryCachingPolicy

public XUsageTrackingQueryCachingPolicy()

Create a new instance with an history size of 256.

メソッドの詳細

minFrequencyToCache

protected int minFrequencyToCache(org.apache.lucene.search.Query query)

For a given query, return how many times it should appear in the history before being cached.

onUse

public void onUse(org.apache.lucene.search.Query query)

定義:

onUse インタフェース内 org.apache.lucene.search.QueryCachingPolicy

shouldCache

public boolean shouldCache(org.apache.lucene.search.Query query,
                           org.apache.lucene.index.LeafReaderContext context)
                    throws IOException

定義:

shouldCache インタフェース内 org.apache.lucene.search.QueryCachingPolicy

例外:

IOException