alluxio.client.file.cache

Class QuotaMetaStore

java.lang.Object

alluxio.client.file.cache.DefaultMetaStore

alluxio.client.file.cache.QuotaMetaStore

All Implemented Interfaces:

MetaStore

public class QuotaMetaStore
extends DefaultMetaStore

A metastore implementation that tracking usage associated with each cache scope.

Constructor Summary

Constructors

Constructor and Description
QuotaMetaStore(AlluxioConfiguration conf)

Method Summary

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

Methods inherited from class alluxio.client.file.cache.DefaultMetaStore

bytes, evict, hasPage, pages

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

QuotaMetaStore

public QuotaMetaStore(AlluxioConfiguration conf)

Parameters:

conf - configuration

Method Detail

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

Overrides:

addPage in class DefaultMetaStore

Parameters:

pageId - page identifier

pageInfo - info of the page

getPageInfo

public PageInfo getPageInfo(PageId pageId)
                     throws PageNotFoundException

Specified by:

getPageInfo in interface MetaStore

Overrides:

getPageInfo in class DefaultMetaStore

Parameters:

pageId - page identifier

Returns:

page info

Throws:

PageNotFoundException

removePage

public PageInfo removePage(PageId pageId)
                    throws PageNotFoundException

Description copied from interface: MetaStore

Removes a page.

Specified by:

removePage in interface MetaStore

Overrides:

removePage in class DefaultMetaStore

Parameters:

pageId - page identifier

Returns:

page info removed

Throws:

PageNotFoundException

bytes

public long bytes(CacheScope cacheScope)

Parameters:

cacheScope - scope to query

Returns:

the total size of pages stored in bytes of the given scope

reset

public void reset()

Description copied from interface: MetaStore

Resets the meta store.

Specified by:

reset in interface MetaStore

Overrides:

reset in class DefaultMetaStore

evict

@Nullable
public PageInfo evict(CacheScope cacheScope)

Parameters:

cacheScope - scope to evict

Returns:

a page to evict in this scope