Class MemStatementIteratorCache

java.lang.Object

org.eclipse.rdf4j.sail.memory.model.MemStatementIteratorCache

public class MemStatementIteratorCache
extends Object

A cache for MemStatementIterator that tracks how frequently an iterator is used and caches the iterator as a list

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	MemStatementIteratorCache.CachedIteration

Field Summary

Fields

Modifier and Type	Field	Description
final int	CACHE_FREQUENCY_THRESHOLD
private final com.google.common.cache.Cache<MemStatementIterator, List<MemStatement>>	iteratorCache
private final ConcurrentHashMap<MemStatementIterator, Integer>	iteratorFrequencyMap
private static final org.slf4j.Logger	logger

Constructor Summary

Constructors

Constructor	Description
MemStatementIteratorCache(int cacheFrequencyThreshold)

Method Summary

Modifier and Type	Method	Description
(package private) MemStatementIteratorCache.CachedIteration	getCachedIterator(MemStatementIterator iterator)
(package private) void	incrementIteratorFrequencyMap(MemStatementIterator iterator)
void	invalidateCache()
(package private) boolean	shouldBeCached(MemStatementIterator iterator)

Methods inherited from class Object

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

Field Details

logger

private static final org.slf4j.Logger logger

CACHE_FREQUENCY_THRESHOLD

public final int CACHE_FREQUENCY_THRESHOLD

iteratorFrequencyMap

private final ConcurrentHashMap<MemStatementIterator, Integer> iteratorFrequencyMap

iteratorCache

private final com.google.common.cache.Cache<MemStatementIterator, List<MemStatement>> iteratorCache

Constructor Details

MemStatementIteratorCache

public MemStatementIteratorCache(int cacheFrequencyThreshold)

Method Details

invalidateCache

public void invalidateCache()

incrementIteratorFrequencyMap

void incrementIteratorFrequencyMap(MemStatementIterator iterator)

shouldBeCached

boolean shouldBeCached(MemStatementIterator iterator)

getCachedIterator

MemStatementIteratorCache.CachedIteration getCachedIterator(MemStatementIterator iterator)