Method init

tutorial/MyGNode/MySubMessageNode.h:22–26

    }

    CStatus init() override {
        CGraph::CGRAPH_ECHO("==> [%s] [init] get conn id = [%d]",
                            this->getName().c_str(), conn_id_);
        return CStatus();
    }

    CStatus run() override {
        std::shared_ptr<MyMessageParam> mp = nullptr;    // 通过智能指针类型，接收一个消息。相比value接收(Recv or Sub)，性能会好一些