See: Description
| Interface | Description | 
|---|---|
| KeyHashingScheme | Since the  HttpCacheStorageinterface
 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. | 
| Class | Description | 
|---|---|
| MemcachedHttpAsyncCacheStorage | 
 This class is a storage backend that uses an external memcached
 for storing cached origin responses. | 
| MemcachedHttpCacheStorage | 
 This class is a storage backend that uses an external memcached
 for storing cached origin responses. | 
| PrefixKeyHashingScheme | This is a  KeyHashingSchemedecorator that simply adds
 a known prefix to the results of anotherKeyHashingScheme. | 
| SHA256KeyHashingScheme | This is a  KeyHashingSchemebased on the
 SHA-256
 algorithm. | 
| Exception | Description | 
|---|---|
| MemcachedKeyHashingException | Signals a problem encountered when trying to map a
 logical "storage key" to a "cache key" suitable for use with
 memcached. | 
| MemcachedOperationTimeoutException | Signals memcached operation timeout. | 
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