Middleware

  • The definition and signature of Middleware is consistent with the ReduxJS community.
  • Sample Code
  1. Middleware<T> logMiddleware<T>({
  2.   String tag = 'redux',
  3.   String Function(T) monitor,
  4. }) {
  5.   return ({Dispatch dispatch, Get<T> getState}) {
  6.     return (Dispatch next) {
  7.       return isDebug()
  8.           ? (Action action) {
  9.               print('---------- [$tag] ----------');
  10.               print('[$tag] ${action.type} ${action.payload}');
  11.  
  12.               final T prevState = getState();
  13.               if (monitor != null) {
  14.                 print('[$tag] prev-state: ${monitor(prevState)}');
  15.               }
  16.  
  17.               next(action);
  18.  
  19.               final T nextState = getState();
  20.               if (monitor != null) {
  21.                 print('[$tag] next-state: ${monitor(nextState)}');
  22.               }
  23.  
  24.               if (prevState == nextState) {
  25.                 print('[$tag] warning: ${action.type} has not been used.');
  26.               }
  27.  
  28.               print('========== [$tag] ================');
  29.             }
  30.           : next;
  31.     };
  32.   };
  33. }

更多的参考 src/utils/common_middleware