code: void reSubscribeByName(EventChannelStruct event_channel_struct, String name) {
          Enumeration callback_structs = event_callback_map.elements();
          while (callback_structs.hasMoreElements()) {
              EventCallBackStruct callback_struct = (EventCallBackStruct) callback_structs.nextElement();
              if (callback_struct.channel_name.equals(name)) {
                  reSubscribe(event_channel_struct, callback_struct);
              }
          }
      }
docs: ===============================================================