Package org.openrefine.model.changes

Class LazyGridCache

java.lang.Object

org.openrefine.model.changes.LazyGridCache

All Implemented Interfaces:

GridCache

public class LazyGridCache
extends Object
implements GridCache

Field Summary

Fields

Modifier and Type	Field	Description
protected Map<Long,Grid>	_cache

Constructor Summary

Constructors

Constructor	Description
LazyGridCache()

Method Summary

Modifier and Type	Method	Description
Grid	cacheGrid(long id, Grid grid)	Caches a grid on disk.
Grid	getCachedGrid(long id)	Retrieves a disk-cached grid.
Set<Long>	listCachedGridIds()	Lists the set of history entry ids for which the resulting grid is cached.
void	uncacheGrid(long id)	Discards the on-disk cache of a grid

Methods inherited from class java.lang.Object

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

Field Detail

_cache

protected final Map<Long,Grid> _cache

Constructor Detail

LazyGridCache

public LazyGridCache()

Method Detail

listCachedGridIds

public Set<Long> listCachedGridIds()

Description copied from interface: GridCache

Lists the set of history entry ids for which the resulting grid is cached.

Specified by:

listCachedGridIds in interface GridCache

getCachedGrid

public Grid getCachedGrid(long id)
                   throws IOException

Description copied from interface: GridCache

Retrieves a disk-cached grid.

Specified by:

getCachedGrid in interface GridCache

Parameters:

id - the id of the history entry which produced it

Returns:

the cached grid

Throws:

IOException - if the grid could not be loaded from disk

uncacheGrid

public void uncacheGrid(long id)
                 throws IOException

Description copied from interface: GridCache

Discards the on-disk cache of a grid

Specified by:

uncacheGrid in interface GridCache

Parameters:

id - the id of the history entry which produced it.

Throws:

IOException - if removing the grid from the cache did not succeed

cacheGrid

public Grid cacheGrid(long id,
                      Grid grid)
               throws IOException

Description copied from interface: GridCache

Caches a grid on disk.

Specified by:

cacheGrid in interface GridCache

Parameters:

id - the id of the history entry which produced it

grid - the grid to cache

Returns:

the same grid read from disk instead.

Throws:

IOException - if caching the grid failed