Module org.apache.jena.serviceplugins

Package org.apache.jena.sparql.service.enhancer.slice.impl

Class SliceInMemoryCache<A>

java.lang.Object

org.apache.jena.sparql.service.enhancer.slice.impl.SliceBase<A>

org.apache.jena.sparql.service.enhancer.slice.impl.SliceInMemoryCache<A>

All Implemented Interfaces:

org.apache.jena.atlas.lib.Sync, HasArrayOps<A>, PageHelper, Slice<A>, SliceMetaDataBasic, SliceWithPages<A>

public class SliceInMemoryCache<A>
extends SliceBase<A>
implements SliceWithPages<A>

A slice implementation that starts to discard pages once there are too many.

Method Summary

Modifier and Type	Method	Description
Disposable	addEvictionGuard(com.google.common.collect.RangeSet<Long> ranges)	Protect a set of ranges from eviction.
void	clear()	Reset this slice - removes all data and sets the size to unknown
static <A> Slice<A>	create(ArrayOps<A> arrayOps, int pageSize, int maxCachedPages)
RefFuture<BufferView<A>>	getPageForPageId(long pageId)
long	getPageSize()
void	sync()

Methods inherited from class org.apache.jena.sparql.service.enhancer.slice.impl.SliceBase

getArrayOps, getFailedRanges, getHasDataCondition, getLoadedRanges, getMaximumKnownSize, getMinimumKnownSize, getReadWriteLock, setMaximumKnownSize, setMinimumKnownSize

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jena.sparql.service.enhancer.slice.api.HasArrayOps

getArrayOps

Methods inherited from interface org.apache.jena.sparql.service.enhancer.slice.api.PageHelper

getIndexInPageForOffset, getPageIdForOffset, getPageOffsetForPageId

Methods inherited from interface org.apache.jena.sparql.service.enhancer.slice.api.Slice

computeFromMetaData, getHasDataCondition, getReadWriteLock, isComplete, mutateMetaData, readMetaData

Methods inherited from interface org.apache.jena.sparql.service.enhancer.slice.api.SliceMetaDataBasic

getFailedRanges, getGaps, getKnownSize, getLoadedRanges, getMaximumKnownSize, getMinimumKnownSize, setKnownSize, setMaximumKnownSize, setMinimumKnownSize, updateMaximumKnownSize, updateMinimumKnownSize

Methods inherited from interface org.apache.jena.sparql.service.enhancer.slice.api.SliceWithPages

newSliceAccessor

Method Details

create

public static <A> Slice<A> create(ArrayOps<A> arrayOps,
 int pageSize,
 int maxCachedPages)

sync

public void sync()

Specified by:

sync in interface org.apache.jena.atlas.lib.Sync

getPageSize

public long getPageSize()

Specified by:

getPageSize in interface PageHelper

Specified by:

getPageSize in interface SliceWithPages<A>

getPageForPageId

public RefFuture<BufferView<A>> getPageForPageId(long pageId)

Specified by:

getPageForPageId in interface SliceWithPages<A>

addEvictionGuard

public Disposable addEvictionGuard(com.google.common.collect.RangeSet<Long> ranges)

Description copied from interface: Slice

Protect a set of ranges from eviction. If the slice does make use of eviction then this method can return null. Otherwise, a disposable must be returned. As long as it is not disposed, the no data in the range may get lost due to eviction. This method should not be used directly but via SliceAccessor.addEvictionGuard(com.google.common.collect.RangeSet<java.lang.Long>).

Specified by:

addEvictionGuard in interface Slice<A>

clear

public void clear()

Description copied from interface: Slice

Reset this slice - removes all data and sets the size to unknown

Specified by:

clear in interface Slice<A>