code: @Process(actionType = HostSelection.class, dependencies = {HostStore.class})
      public void onSelectHost(final HostSelection action, final Dispatcher.Channel channel) {
  
          // load the server data on demand
          if(!host2server.containsKey(action.getHostName()))
              onRefresh(channel);
          else {
  
              channel.ack();
          }
  
      }
docs: action processing