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

String

hash(String storageKey) Maps a storage key to a cache key.

Method Detail

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