Persistent state

pub package

Persist state in an Hive database across restarts and returns from hibernation


Create state update types

Define the state mutations:

   enum UpdateType { intProp, stringProp, doubleProp, listProp, mapProp }

Create the state class

Create your state class and map the properties to the persitent store:

   import 'package:persistent_state/persistent_state.dart';

   enum UpdateType { intProp, stringProp, doubleProp, listProp, mapProp }

   class AppState with PersistentState<UpdateType> {
      int get intProp => select<int>("int_prop");
      set intProp(int v) => mutate<int>("int_prop", v, UpdateType.intProp);
      double get doubleProp => select<double>("double_prop");
      set doubleProp(double v) =>
          mutate<double>("double_prop", v, UpdateType.doubleProp);
      String get stringProp => select<String>("string_prop");
      set stringProp(String v) =>
          mutate<String>("string_prop", v, UpdateType.stringProp);
      List<int> get listProp => select<List<int>>("list_prop");
      set listProp(List<int> v) =>
          mutate<List<int>>("list_prop", v, UpdateType.listProp);
      Map<String, int> get mapProp => select<Map<String, int>>("map_prop");
      set mapProp(Map<String, int> v) =>
          mutate<Map<String, int>>("map_prop", v, UpdateType.mapProp);

All the mutations will be persisted to the database:

   final AppState state = AppState();
   state.doubleProp = 3.0;

Note: the state reads with select do not hit the database and use an in memory copy of the state

Listen to state changes

A changefeed is available:

   /// [appState] is an [AppState] instance
   appState.changeFeed.listen((StateUpdate change) =>
      print("State update: \n${change.type}");


An example with Provider is available