alluxio.client.file.cache

Class DefaultMetaStore

java.lang.Object

alluxio.client.file.cache.DefaultMetaStore

All Implemented Interfaces:

MetaStore

public class DefaultMetaStore
extends Object
implements MetaStore

The default implementation of a metadata store for pages stored in cache. This implementation is not thread safe and requires synchronizations on external callers.

Constructor Summary

Constructors

Constructor and Description
DefaultMetaStore(CacheEvictor evictor)

Method Summary

Modifier and Type	Method and Description
void	addPage(PageId pageId, PageInfo pageInfo) Adds a new page to the cache.
long	bytes()
PageInfo	evict()
PageInfo	getPageInfo(PageId pageId)
boolean	hasPage(PageId pageId)
long	pages()
void	removePage(PageId pageId) Removes a page.
void	reset() Resets the meta store.

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.MetaStore

create

Constructor Detail

DefaultMetaStore

public DefaultMetaStore(CacheEvictor evictor)

Parameters:

evictor - cache evictor

Method Detail

hasPage

public boolean hasPage(PageId pageId)

Specified by:

hasPage in interface MetaStore

Parameters:

pageId - page identifier

Returns:

if a page is stored in cache

addPage

public void addPage(PageId pageId,
                    PageInfo pageInfo)

Description copied from interface: MetaStore

Adds a new page to the cache.

Specified by:

addPage in interface MetaStore

Parameters:

pageId - page identifier

pageInfo - info of the page

getPageInfo

public PageInfo getPageInfo(PageId pageId)
                     throws PageNotFoundException

Specified by:

getPageInfo in interface MetaStore

Parameters:

pageId - page identifier

Returns:

page info

Throws:

PageNotFoundException

removePage

public void removePage(PageId pageId)
                throws PageNotFoundException

Description copied from interface: MetaStore

Removes a page.

Specified by:

removePage in interface MetaStore

Parameters:

pageId - page identifier

Throws:

PageNotFoundException

bytes

public long bytes()

Specified by:

bytes in interface MetaStore

Returns:

the total size of pages stored in bytes

pages

public long pages()

Specified by:

pages in interface MetaStore

Returns:

the number of pages stored

reset

public void reset()

Description copied from interface: MetaStore

Resets the meta store.

Specified by:

reset in interface MetaStore

evict

@Nullable
public PageInfo evict()

Specified by:

evict in interface MetaStore

Returns:

a page to evict