code: private static BinaryMemcacheRequest handleUnlockRequest(final UnlockRequest msg) {
          byte[] key = msg.keyBytes();
          short keyLength = (short) key.length;
          BinaryMemcacheRequest request = new DefaultBinaryMemcacheRequest(key);
          request.setOpcode(OP_UNLOCK);
          request.setKeyLength(keyLength);
          request.setTotalBodyLength(keyLength);
          request.setCAS(msg.cas());
          return request;
      }
docs: Encodes a {@link UnlockRequest} into its lower level representation.
  
  @return a ready {@link BinaryMemcacheRequest}.