persistent_state 0.2.0

Persist state in a Sqlite database across restarts and returns from hibernation

Persistent state

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

Powered by the KvSql key/value store. The state is saved to an Sqlite database

Usage

Create your state class:

import 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:persistent_state/persistent_state.dart';


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

class AppState with PersistentState<UpdateType> {

  double get doubleProp => select<double>("double_prop");
  set doubleProp(double v) =>
      mutate<double>("double_prop", v, UpdateType.doubleProp);

  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:

state.doubleProp = 3.0;

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

If you already use KvSql you can provide your own store:

final store = KvStore(inMemory: true);

class AppState with PersistentState<UpdateType> {
   @override
   KvStore kvStore => store;
}

Listen to state changes

A changefeed is available:

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

Example

An example with Provider is available