oathdruid commented on issue #2671:
URL: https://github.com/apache/brpc/issues/2671#issuecomment-2232605089

   can we make RpcPBMessages a virtual class?
   
   implementations can track arena / other memory resource, along with 
messages. like this
   ```
   class RpcPBMessageManager {
   public:
       virtual ::std::unique_ptr<RpcPBMessages> Get(const 
google::protobuf::Service& service,
                                                                                
          const google::protobuf::MethodDescriptor& method) = 0;
   
       virtual void Return(::std::unique_ptr<RpcPBMessages> protobuf_message) = 
0;
   };
   
   class CustomRpcPBMessages : public RpcPBMessages {
        MemoryResource resource;
   };
   ```
   
   this simplify lookup from Message* to Arena / MemoryResource they belong


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