alluxio.client.file.cache

Interface MetaStore

All Known Implementing Classes:

DefaultMetaStore

public interface MetaStore

The metadata store for pages stored in cache.

Method Summary

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

Method Detail

create

static MetaStore create()

Returns:

an instance of MetaStore

hasPage

boolean hasPage(PageId pageId)

Parameters:

pageId - page identifier

Returns:

if a page is stored in cache

addPage

void addPage(PageId pageId,
             PageInfo pageInfo)

Adds a new page to the cache.

Parameters:

pageId - page identifier

pageInfo - info of the page

getPageInfo

PageInfo getPageInfo(PageId pageId)
              throws PageNotFoundException

Parameters:

pageId - page identifier

Returns:

page info

Throws:

PageNotFoundException

removePage

void removePage(PageId pageId)
         throws PageNotFoundException

Removes a page.

Parameters:

pageId - page identifier

Throws:

PageNotFoundException

bytes

long bytes()

Returns:

the total size of pages stored in bytes

pages

long pages()

Returns:

the number of pages stored

reset

void reset()

Resets the meta store.