Cache (Solr 9.1.0 hdfs API)

All Known Implementing Classes:

BlockDirectoryCache
```
public interface Cache
```
WARNING: This API is experimental and might change in incompatible ways in the next release.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`delete(String name)`	Remove a file from the cache.
`boolean`	`fetch(String name, long blockId, int blockOffset, byte[] b, int off, int lengthToReadInBlock)`	Fetch the specified cache file content.
`void`	`releaseResources()`	Release any resources associated with the cache.
`void`	`renameCacheFile(String source, String dest)`	Expert: Rename the specified file in the cache.
`long`	`size()`	Number of entries in the cache.
`void`	`update(String name, long blockId, int blockOffset, byte[] buffer, int offset, int length)`	Update the content of the specified cache file.

- Method Detail
  - delete
```
void delete(String name)
```
    Remove a file from the cache.
    
    Parameters:
    
    name - cache file name
  - update
```
void update(String name,
            long blockId,
            int blockOffset,
            byte[] buffer,
            int offset,
            int length)
```
    Update the content of the specified cache file. Creates cache entry if necessary.
  - fetch
```
boolean fetch(String name,
              long blockId,
              int blockOffset,
              byte[] b,
              int off,
              int lengthToReadInBlock)
```
    Fetch the specified cache file content.
    
    Returns:
    
    true if cached content found, otherwise return false
  - size
```
long size()
```
    Number of entries in the cache.
  - renameCacheFile
```
void renameCacheFile(String source,
                     String dest)
```
    Expert: Rename the specified file in the cache. Allows a file to be moved without invalidating the cache.
    
    Parameters:
    
    source - original name
    
    dest - final name
  - releaseResources
```
void releaseResources()
```
    Release any resources associated with the cache.