async_set

异步写单行数据

    ///
    /// \brief asynchronous set
    ///     store the k-v to the cluster.
    ///     will not be blocked, return immediately.
    ///     key is composed of hashkey and sortkey.
    /// \param hashkey
    /// used to decide which partition to put this k-v
    /// \param sortkey
    /// all the k-v under hashkey will be stored by sortkey.
    /// \param value
    /// the value we want to store.
    /// \param callback
    /// the callback function will be invoked after operation finished or error occurred.
    /// \param timeout_milliseconds
    /// if wait longer than this value, will return time out error.
    /// \param ttl_seconds
    /// time to live of this value, if expired, will return not found; 0 means no ttl.
    /// \return
    /// void.
    ///
    virtual void async_set(const std::string &hashkey,
                           const std::string &sortkey,
                           const std::string &value,
                           async_set_callback_t &&callback = nullptr,
                           int timeout_milliseconds = 5000,
                           int ttl_seconds = 0) = 0;