alluxio.client.file.cache

Interface CacheManager

All Superinterfaces:

AutoCloseable

All Known Implementing Classes:

LocalCacheManager, NoExceptionCacheManager

public interface CacheManager
extends AutoCloseable

Interface for managing cached pages.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	CacheManager.Factory Factory class to get or create a CacheManager.

Method Summary

Modifier and Type	Method and Description
boolean	delete(PageId pageId) Deletes a page from the cache.
default 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 interface java.lang.AutoCloseable

close

Method Detail

put

boolean put(PageId pageId,
            byte[] page)

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

Parameters:

pageId - page identifier

page - page data

Returns:

true if the put was successful, false otherwise

get

default 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.

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

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.

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

boolean delete(PageId pageId)

Deletes a page from the cache.

Parameters:

pageId - page identifier

Returns:

true if the page is successfully deleted, false otherwise