Package org.aksw.commons.io.slice

Class SliceInMemoryCache<A>

java.lang.Object

org.aksw.commons.io.slice.SliceBase<A>

org.aksw.commons.io.slice.SliceInMemoryCache<A>

All Implemented Interfaces:

Slice<A>, SliceMetaDataBasic, SliceWithPages<A>, org.aksw.commons.io.util.Sync, PageHelper

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

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

Author:

raven

Field Summary

Fields

Modifier and Type	Field	Description
protected SliceMetaDataWithPages	metaData
protected AsyncClaimingCache<Long,BufferView<A>>	pageCache

Fields inherited from class org.aksw.commons.io.slice.SliceBase

arrayOps, hasDataCondition, readWriteLock

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	SliceInMemoryCache(ArrayOps<A> arrayOps, int pageSize, AsyncClaimingCacheImpl.Builder<Long,BufferView<A>> cacheBuilder)

Method Summary

Modifier and Type	Method	Description
Disposable	addEvictionGuard(com.google.common.collect.RangeSet<Long> ranges)	Protect a set of ranges from eviction.
static <A> Slice<A>	create(ArrayOps<A> arrayOps, int pageSize, int maxCachedPages)
static <A> SliceInMemory<A>	create(ArrayOps<A> arrayOps, Buffer<A> buffer)
protected void	evictPage(long pageId)
protected SliceMetaDataBasic	getMetaData()
RefFuture<BufferView<A>>	getPageForPageId(long pageId)
long	getPageSize()
protected BufferView<A>	loadPage(long pageId)
void	sync()

Methods inherited from class org.aksw.commons.io.slice.SliceBase

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.aksw.commons.util.range.PageHelper

getIndexInPageForOffset, getPageIdForOffset, getPageOffsetForPageId

Methods inherited from interface org.aksw.commons.io.slice.Slice

computeFromMetaData, getArrayOps, getHasDataCondition, getReadWriteLock, isComplete, mutateMetaData, readMetaData

Methods inherited from interface org.aksw.commons.io.slice.SliceMetaDataBasic

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

Methods inherited from interface org.aksw.commons.io.slice.SliceWithPages

newSliceAccessor

Field Details

metaData

protected SliceMetaDataWithPages metaData

pageCache

protected AsyncClaimingCache<Long,BufferView<A>> pageCache

Constructor Details

SliceInMemoryCache

protected SliceInMemoryCache(ArrayOps<A> arrayOps,
 int pageSize,
 AsyncClaimingCacheImpl.Builder<Long,BufferView<A>> cacheBuilder)

Method Details

create

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

evictPage

protected void evictPage(long pageId)

loadPage

protected BufferView<A> loadPage(long pageId)

create

public static <A> SliceInMemory<A> create(ArrayOps<A> arrayOps,
 Buffer<A> buffer)

getMetaData

protected SliceMetaDataBasic getMetaData()

Specified by:

getMetaData in class SliceBase<A>

sync

public void sync()
          throws IOException

Specified by:

sync in interface org.aksw.commons.io.util.Sync

Throws:

IOException

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 no data in the range may get lost due to eviction. This method should not be used directly but via {@link SliceAccessor#addEvictionGuard(RangeSet))}.

Specified by:

addEvictionGuard in interface Slice<A>