refactor pub/sub center.

lichao

2021-04-02 0bc72d004b08b6cac005931787f43c68dace7685

 src/pubsub_center.h

@@ -37,11 +37,6 @@
   SocketBus socket_;
   ShmSocket::Shm &shm() { return socket_.shm(); }

   std::mutex mutex_;
   typedef std::set<MQId> Clients;
   std::unordered_map<Topic, Clients> records_;
   bool Find1(const Topic &topic);

public:
   PubSubCenter(ShmSocket::Shm &shm) :
       socket_(shm) {}