private String getCacheKey(String keySpace, String columnFamily, String key) throws StorageClientException {
        if (client instanceof RowHasher) {
            return ((RowHasher) client).rowHash(keySpace, columnFamily, key);
        }
        return keySpace + ":" + columnFamily + ":" + key;
    }
private String getCacheKey ( String keySpace , String columnFamily , String key ) throws StorageClientException { if ( client instanceof RowHasher ) { return ( ( RowHasher ) client ) . rowHash ( keySpace , columnFamily , key ) ; } return keySpace + ":" + columnFamily + ":" + key ; }
Combine the parameters into a key suitable for storage and lookup in the
cache.

@param keySpace
@param columnFamily
@param key
@return the cache key
@throws StorageClientException