public CASOperation cas(StoreType type, String key, long casId, int flags,
      int exp, byte[] data, StoreOperation.Callback cb) {
    return new CASOperationImpl(key, casId, flags, exp, data, cb);
  }
Operation factory for the ascii protocol.
src/main/java/net/spy/memcached/protocol/ascii/AsciiOperationFactory.java