isolate sqflite demo
main.dart
import 'package:flutter/material.dart'; import 'demo_isolates.dart'; import 'package:rxdart/rxdart.dart'; import 'dbhelper.dart'; import 'package:flutter_isolate/flutter_isolate.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), initialRoute: '/', routes: { '/':(context)=>MyHome(), '/second':(context)=>SecondPage(), }, ); } } class MyHome extends StatelessWidget{ DataBloc dataBloc = DataBloc(); FlutterIsolate isolate; DB db = DB(); checkData()async{ var a = await db.queryData('SELECT * FROM type'); print(a); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('sss'),), body: Container(child: Column( children: <Widget>[ StreamBuilder( stream: dataBloc.dataBloc.stream, builder: (context, snapshot){ if(snapshot.hasData){ return Text('${snapshot.data}'); }else{ return Text('pending'); } }, ), RaisedButton(child: Text('start'),onPressed: ()async{ isolate = await spawnIsolate('abc', dataBloc); },), RaisedButton(child: Text('stop'),onPressed: (){ isolate.kill(); },), RaisedButton(child: Text('check'),onPressed: (){ checkData(); },), RaisedButton(child: Text('go to 2'),onPressed: (){ Navigator.of(context).pushNamed('/second'); },), ], ),), ); } } class SecondPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('second page'),), body: Container(child: Center(child: Text('second'),),), ); } } class DataBloc { ReplaySubject dataBloc = ReplaySubject(); }
demo_isolates.dart
import 'dart:async'; import 'dart:isolate'; import 'dbhelper.dart'; import 'main.dart'; import 'package:flutter_isolate/flutter_isolate.dart'; Future<FlutterIsolate> spawnIsolate(String type, DataBloc bloc) async { ReceivePort receivePort = new ReceivePort(); ReceivePort listenPort = ReceivePort(); FlutterIsolate isolate = await FlutterIsolate.spawn(dartIsolateLongRunningOperation, receivePort.sendPort); SendPort t = await receivePort.first; t.send({'sender':listenPort.sendPort, 'msg':type}); listenPort.listen((data){ bloc.dataBloc.add(data); }); return isolate; } void dartIsolateLongRunningOperation(SendPort sendPort) async { ReceivePort port = ReceivePort(); sendPort.send(port.sendPort); port.listen((data)async{ await doWork(data['msg'], data['sender']); }); } Future doWork(String type, SendPort sender)async{ DB db = DB(); int i = 0; while(i<30){ var a = await db.addData('type', {'name':'$i'}); sender.send('id: $a'); i++; await Future.delayed(Duration(seconds: 1)); } }