alluxio.client.file.cache.evictor

Class LRUCacheEvictor

java.lang.Object

alluxio.client.file.cache.evictor.LRUCacheEvictor

All Implemented Interfaces:

CacheEvictor

Direct Known Subclasses:

NondeterministicLRUCacheEvictor

@ThreadSafe
public class LRUCacheEvictor
extends Object
implements CacheEvictor

LRU client-side cache eviction policy.

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<PageId,Boolean>	mLRUCache

Constructor Summary

Constructors

Constructor and Description
LRUCacheEvictor(CacheEvictorOptions options) Constructor.

Method Summary

Modifier and Type	Method and Description
PageId	evict()
PageId	evictMatching(java.util.function.Predicate<PageId> criterion) Picks the first candidate for eviction that satisfies the given criterion.
void	reset() Resets the evictor.
void	updateOnDelete(PageId pageId) Updates evictor after a delete operation.
void	updateOnGet(PageId pageId) Updates evictor after a get operation.
void	updateOnPut(PageId pageId) Updates evictor after a put operation.

Methods inherited from class java.lang.Object

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

Methods inherited from interface alluxio.client.file.cache.evictor.CacheEvictor

create

Field Detail

mLRUCache

protected final Map<PageId,Boolean> mLRUCache

Constructor Detail

LRUCacheEvictor

public LRUCacheEvictor(CacheEvictorOptions options)

Constructor.

Parameters:

options -

Method Detail

updateOnGet

public void updateOnGet(PageId pageId)

Description copied from interface: CacheEvictor

Updates evictor after a get operation.

Specified by:

updateOnGet in interface CacheEvictor

Parameters:

pageId - page identifier

updateOnPut

public void updateOnPut(PageId pageId)

Description copied from interface: CacheEvictor

Updates evictor after a put operation.

Specified by:

updateOnPut in interface CacheEvictor

Parameters:

pageId - page identifier

updateOnDelete

public void updateOnDelete(PageId pageId)

Description copied from interface: CacheEvictor

Updates evictor after a delete operation.

Specified by:

updateOnDelete in interface CacheEvictor

Parameters:

pageId - page identifier

evict

@Nullable
public PageId evict()

Specified by:

evict in interface CacheEvictor

Returns:

a page to evict or null if no page available to evict

evictMatching

@Nullable
public PageId evictMatching(java.util.function.Predicate<PageId> criterion)

Description copied from interface: CacheEvictor

Picks the first candidate for eviction that satisfies the given criterion.

Specified by:

evictMatching in interface CacheEvictor

Parameters:

criterion - criterion

Returns:

the eviction candidate, or null if none

reset

public void reset()

Description copied from interface: CacheEvictor

Resets the evictor.

Specified by:

reset in interface CacheEvictor