TODO setting configuration.

NanomsgReqChannel shared by symbols.

PluginIns created at two scenarios 1.

PortableFunc each function symbol only has a singleton Each singleton are long-running go routine Currently, it is cached and never ended once created It is actually a wrapper of the data channel and can be fit to any plugin instance Thus, it is possible to hot reload, which is simply attach a new nng client to the same channel without changing the server(plugin runtime) side TODO think about ending a portable func when needed.