Package org.apache.http.impl.client.cache.memcached

Interface KeyHashingScheme

All Known Implementing Classes:
PrefixKeyHashingScheme, SHA256KeyHashingScheme
public interface KeyHashingScheme
Since the HttpCacheStorage interface expects to use variant-annotated URLs for its storage keys, but Memcached has a maximum key size, we need to support mapping storage keys to cache keys. Clients can implement this interface to change the way the mapping is done (for example, to add a prefix to all cache keys to provide a form of memcached namespacing).

  • Method Summary

    Modifier and Type
    Method
    Description
    String
    hash(String storageKey)
    Maps a storage key to a cache key.

  • Method Details

    • hash

      String hash(String storageKey)
      Maps a storage key to a cache key. The storage key is what the higher-level HTTP cache uses as a key; the cache key is what we use as a key for talking to memcached.
      Parameters:
      storageKey - what the higher-level HTTP cache wants to use as its key for looking up cache entries
      Returns:
      a cache key suitable for use with memcached