org.neo4j.io.pagecache

Interface PageSwapperFactory

public interface PageSwapperFactory

Creates PageSwappers for the given files. A PageSwapper is responsible for swapping file pages in and out of memory. The PageSwapperFactory presumably knows about what file system to use.

Method Summary

Methods

Modifier and Type	Method and Description
PageSwapper	createPageSwapper(File file, int filePageSize, PageEvictionCallback onEviction) Create a PageSwapper for the given file.

Method Detail

createPageSwapper

PageSwapper createPageSwapper(File file,
                            int filePageSize,
                            PageEvictionCallback onEviction)
                              throws IOException

Create a PageSwapper for the given file.

Parameters:

file - The file that the PageSwapper will move file pages in and out of.

filePageSize - The size of the pages in the file. Presumably a multiple of some record size.

onEviction - The PageSwapper will be told about evictions, and has the responsibility of informing the PagedFile via this callback.

Returns:

A working PageSwapper instance for the given file.

Throws:

IOException - If the PageSwapper could not be created, for instance if the underlying file could not be opened.