alluxio.client.file.cache

Class DefaultPageMetaStore

java.lang.Object

alluxio.client.file.cache.DefaultPageMetaStore

All Implemented Interfaces:

PageMetaStore

Direct Known Subclasses:

QuotaPageMetaStore

@NotThreadSafe
public class DefaultPageMetaStore
extends Object
implements PageMetaStore

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

Field Summary

Fields

Modifier and Type	Field and Description
protected ReentrantReadWriteLock	mLock

Constructor Summary

Constructors

Constructor and Description
DefaultPageMetaStore(List<PageStoreDir> dirs) Constructor of DefaultMetaStore.
DefaultPageMetaStore(List<PageStoreDir> dirs, ReentrantReadWriteLock lock) Creates a new instance with a shared lock.

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(CacheScope scope, PageStoreDir pageStoreDir)
ReentrantReadWriteLock	getLock()
PageInfo	getPageInfo(PageId pageId)
Iterator<PageId>	getPagesIterator() Gets an iterator over the pages currently stored in this metastore.
List<PageStoreDir>	getStoreDirs() Gets the storage directories.
boolean	hasPage(PageId pageId)
long	numPages()
PageInfo	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.PageMetaStore

create, evict

Field Detail

mLock

protected final ReentrantReadWriteLock mLock

Constructor Detail

DefaultPageMetaStore

public DefaultPageMetaStore(List<PageStoreDir> dirs)

Constructor of DefaultMetaStore.

Parameters:

dirs - storage directories

DefaultPageMetaStore

public DefaultPageMetaStore(List<PageStoreDir> dirs,
                            ReentrantReadWriteLock lock)

Creates a new instance with a shared lock.

Parameters:

dirs - storage directories

lock - the lock to associate with this meta store

Method Detail

getLock

public ReentrantReadWriteLock getLock()

Specified by:

getLock in interface PageMetaStore

Returns:

the associated lock

hasPage

public boolean hasPage(PageId pageId)

Specified by:

hasPage in interface PageMetaStore

Parameters:

pageId - page identifier

Returns:

if a page is stored in cache

addPage

public void addPage(PageId pageId,
                    PageInfo pageInfo)

Description copied from interface: PageMetaStore

Adds a new page to the cache.

Specified by:

addPage in interface PageMetaStore

Parameters:

pageId - page identifier

pageInfo - info of the page

getPagesIterator

public Iterator<PageId> getPagesIterator()

Description copied from interface: PageMetaStore

Gets an iterator over the pages currently stored in this metastore.

Specified by:

getPagesIterator in interface PageMetaStore

Returns:

iterator of the pages

getStoreDirs

public List<PageStoreDir> getStoreDirs()

Description copied from interface: PageMetaStore

Gets the storage directories.

Specified by:

getStoreDirs in interface PageMetaStore

Returns:

the storage directories

getPageInfo

public PageInfo getPageInfo(PageId pageId)
                     throws PageNotFoundException

Specified by:

getPageInfo in interface PageMetaStore

Parameters:

pageId - page identifier

Returns:

page info

Throws:

PageNotFoundException

removePage

public PageInfo removePage(PageId pageId)
                    throws PageNotFoundException

Description copied from interface: PageMetaStore

Removes a page.

Specified by:

removePage in interface PageMetaStore

Parameters:

pageId - page identifier

Returns:

page info removed

Throws:

PageNotFoundException

bytes

public long bytes()

Specified by:

bytes in interface PageMetaStore

Returns:

the total size of pages stored in bytes

numPages

public long numPages()

Specified by:

numPages in interface PageMetaStore

Returns:

the number of pages stored

reset

public void reset()

Description copied from interface: PageMetaStore

Resets the meta store.

Specified by:

reset in interface PageMetaStore

evict

@Nullable
public PageInfo evict(CacheScope scope,
                                PageStoreDir pageStoreDir)

Specified by:

evict in interface PageMetaStore

Returns:

a page to evict