GridCache (OpenRefine 4.0-SNAPSHOT API)

All Known Implementing Classes:

FileGridCache, LazyGridCache
```
public interface GridCache
```
An interface for accessing some intermediate grids in a project, which are stored on disk.

Method Summary

All Methods Instance Methods Abstract Methods
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

- Method Detail
  - listCachedGridIds
```
Set<Long> listCachedGridIds()
```
    Lists the set of history entry ids for which the resulting grid is cached.
  - getCachedGrid
```
Grid getCachedGrid(long id)
            throws IOException
```
    Retrieves a disk-cached grid.
    
    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
```
void uncacheGrid(long id)
          throws IOException
```
    Discards the on-disk cache of a grid
    
    Parameters:
    
    id - the id of the history entry which produced it.
    
    Throws:
    
    IOException - if removing the grid from the cache did not succeed
  - cacheGrid
```
Grid cacheGrid(long id,
               Grid grid)
        throws IOException
```
    Caches a grid on disk.
    
    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