alluxio.client.file.cache

Class NoExceptionCacheManager

java.lang.Object

alluxio.client.file.cache.NoExceptionCacheManager

All Implemented Interfaces:

CacheManager, AutoCloseable

public class NoExceptionCacheManager
extends Object
implements CacheManager

A wrapper class of CacheManager without throwing unchecked exceptions.

Nested Class Summary

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

CacheManager.Factory

Constructor Summary

Constructors

Constructor and Description
NoExceptionCacheManager(CacheManager cacheManager)

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	delete(PageId pageId) Deletes a page from the cache.
int	get(PageId pageId, int bytesToRead, byte[] buffer, int offsetInBuffer) Reads the entire page if the queried page is found in the cache, stores the result in buffer.
int	get(PageId pageId, int pageOffset, int bytesToRead, byte[] buffer, int offsetInBuffer) Reads a part of a page if the queried page is found in the cache, stores the result in buffer.
boolean	put(PageId pageId, byte[] page) Puts a page into the cache manager.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NoExceptionCacheManager

public NoExceptionCacheManager(CacheManager cacheManager)

Parameters:

cacheManager - delegated cache manager

Method Detail

put

public boolean put(PageId pageId,
                   byte[] page)

Description copied from interface: CacheManager

Puts a page into the cache manager. This method is best effort. It is possible that this put operation returns without page written.

Specified by:

put in interface CacheManager

Parameters:

pageId - page identifier

page - page data

Returns:

true if the put was successful, false otherwise

get

public int get(PageId pageId,
               int bytesToRead,
               byte[] buffer,
               int offsetInBuffer)

Description copied from interface: CacheManager

Reads the entire page if the queried page is found in the cache, stores the result in buffer.

Specified by:

get in interface CacheManager

Parameters:

pageId - page identifier

bytesToRead - number of bytes to read in this page

buffer - destination buffer to write

offsetInBuffer - offset in the destination buffer to write

Returns:

number of bytes read, 0 if page is not found, -1 on errors

get

public int get(PageId pageId,
               int pageOffset,
               int bytesToRead,
               byte[] buffer,
               int offsetInBuffer)

Description copied from interface: CacheManager

Reads a part of a page if the queried page is found in the cache, stores the result in buffer.

Specified by:

get in interface CacheManager

Parameters:

pageId - page identifier

pageOffset - offset into the page

bytesToRead - number of bytes to read in this page

buffer - destination buffer to write

offsetInBuffer - offset in the destination buffer to write

Returns:

number of bytes read, 0 if page is not found, -1 on errors

delete

public boolean delete(PageId pageId)

Description copied from interface: CacheManager

Deletes a page from the cache.

Specified by:

delete in interface CacheManager

Parameters:

pageId - page identifier

Returns:

true if the page is successfully deleted, false otherwise

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception