Package org.cache2k.core.eviction

Class EvictionFactory

java.lang.Object

org.cache2k.core.eviction.EvictionFactory

public class EvictionFactory
extends Object

Author:

Jens Wilke

Constructor Summary

Constructors

Constructor	Description
EvictionFactory()

Method Summary

Modifier and Type	Method	Description
Eviction	constructEviction(InternalCacheBuildContext customizationContext, HeapCacheForEviction hc, InternalEvictionListener l, org.cache2k.config.Cache2kConfig config, int availableProcessors)	Construct segmented or queued eviction.
static long	determineMaxSize(long entryCapacity, int segmentCount)
static long	determineMaxWeight(long maximumWeight, int segmentCount)
static int	determineSegmentCount(boolean strictEviction, int availableProcessors, boolean boostConcurrency, long entryCapacity, long maxWeight, int segmentCountOverride)	Determine number of segments based on the the available processors.

Methods inherited from class java.lang.Object

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

Constructor Detail

EvictionFactory

public EvictionFactory()

Method Detail

constructEviction

public Eviction constructEviction(InternalCacheBuildContext customizationContext,
                                  HeapCacheForEviction hc,
                                  InternalEvictionListener l,
                                  org.cache2k.config.Cache2kConfig config,
                                  int availableProcessors)

Construct segmented or queued eviction. For the moment hard coded. If capacity is at least 1000 we use 2 segments if 2 or more CPUs are available. Segmenting the eviction only improves for lots of concurrent inserts or evictions, there is no effect on read performance.

determineMaxSize

public static long determineMaxSize(long entryCapacity,
                                    int segmentCount)

determineMaxWeight

public static long determineMaxWeight(long maximumWeight,
                                      int segmentCount)

determineSegmentCount

public static int determineSegmentCount(boolean strictEviction,
                                        int availableProcessors,
                                        boolean boostConcurrency,
                                        long entryCapacity,
                                        long maxWeight,
                                        int segmentCountOverride)

Determine number of segments based on the the available processors. For small cache sizes, no segmentation happens at all.