alluxio.client.file.cache.store

Class MemoryPageStore

java.lang.Object

alluxio.client.file.cache.store.MemoryPageStore

All Implemented Interfaces:

PageStore, java.lang.AutoCloseable

@NotThreadSafe
public class MemoryPageStore
extends java.lang.Object
implements PageStore

The MemoryPageStore is an implementation of PageStore which stores all pages in memory.

Nested Class Summary

Nested classes/interfaces inherited from interface alluxio.client.file.cache.PageStore

PageStore.Metrics

Field Summary

Fields inherited from interface alluxio.client.file.cache.PageStore

LOG

Constructor Summary

Constructors

Constructor and Description
MemoryPageStore(int pageSize) Constructor of MemoryPageStore.

Method Summary

Modifier and Type	Method and Description
void	close()
void	delete(PageId pageId) Deletes a page from the store.
int	get(PageId pageId, int pageOffset, int bytesToRead, PageReadTargetBuffer target, boolean isTemporary) Gets part of a page from the store to the destination buffer.
PageId	getKeyFromPageId(PageId pageId)
void	put(PageId pageId, java.nio.ByteBuffer page, boolean isTemporary) Writes a new page from a source channel to the store.
void	reset()

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.PageStore

abort, commit, commit, create, get, get, put, put, putTemporary

Constructor Detail

MemoryPageStore

public MemoryPageStore(int pageSize)

Constructor of MemoryPageStore.

Parameters:

pageSize - page size

Method Detail

put

public void put(PageId pageId,
                java.nio.ByteBuffer page,
                boolean isTemporary)
         throws java.io.IOException

Description copied from interface: PageStore

Writes a new page from a source channel to the store.

Specified by:

put in interface PageStore

Parameters:

pageId - page identifier

page - page data

isTemporary - is page data temporary

Throws:

ResourceExhaustedException - when there is not enough space found on disk

java.io.IOException - when the store fails to write this page

get

public int get(PageId pageId,
               int pageOffset,
               int bytesToRead,
               PageReadTargetBuffer target,
               boolean isTemporary)
        throws java.io.IOException,
               PageNotFoundException

Description copied from interface: PageStore

Gets part of a page from the store to the destination buffer.

Specified by:

get in interface PageStore

Parameters:

pageId - page identifier

pageOffset - offset within page

bytesToRead - bytes to read in this page

target - destination buffer

isTemporary - is page data temporary

Returns:

the number of bytes read

Throws:

java.io.IOException - when the store fails to read this page

PageNotFoundException - when the page isn't found in the store

delete

public void delete(PageId pageId)
            throws java.io.IOException,
                   PageNotFoundException

Description copied from interface: PageStore

Deletes a page from the store.

Specified by:

delete in interface PageStore

Parameters:

pageId - page identifier

Throws:

java.io.IOException - when the store fails to delete this page

PageNotFoundException - when the page isn't found in the store

getKeyFromPageId

public PageId getKeyFromPageId(PageId pageId)

Parameters:

pageId - page Id

Returns:

the key to this page

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

reset

public void reset()