Optional name for an agent?
eao197 opened this issue · comments
For some case (like logging and run-time monitoring) may be useful to have a possibility to specify a name for an agent. That name has to be stored inside so_5::agent_t
and should be available via a pointer/reference to so_5::agent_t
.
I don't think it's a good idea to place another std::string
into so_5::agent_t
, because in the most cases it will be an empty value.
Maybe something like that:
namespace so_5
{
// Public stuff.
struct anonymous_agent_id_t { std::array<char, N> m_ptr_as_id; };
struct named_agent_id_t { std::string_view m_name; }
using agent_name_t = std::variant<anonymous_agent_id_t, named_agent_id_t>;
[[nodiscard]]
std::string_view to_string_view(const agent_name_t & name);
class agent_t {
public:
[[nodiscard]]
agent_name_t
so_agent_name() const noexcept;
private:
std::unique_ptr<char[]> m_agent_name;
};
} /* namespace so_5 */
If the name is not specified in the constructor (via modificators for context_t object) then agent_t::m_agent_name
will be nullptr. And agent_t::so_agent_name()
will return an instance of anonymous_agent_id_t
where m_ptr_as_id
will hold a string representation of agent's this
pointer.
If the name is specified, then agent_t::m_agent_name
will contain a copy of name inside, and agent_t::so_agent_name()
will return named_agent_id_t
that references this name.
So if the name is not used the space penalty will be just sizeof(std::unique_ptr<char[]>)
(8 bytes for 64-bit platform).
It's a part of v.5.8.2 release.