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isolate sample maintenance (#167)
* isolate sample maintenance - use slightly more meaningful names - rename files - misc small readability changes * update MAINTENANCE.md * fix gh username * formatting * upgrade dependencies
This commit is contained in:
John Ryan
GitHub
278
isolate_example/lib/data_transfer_page.dart
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278
isolate_example/lib/data_transfer_page.dart
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// Copyright 2019-present the Flutter authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import 'dart:isolate';
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import 'dart:math';
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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class DataTransferPageStarter extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return ChangeNotifierProvider(
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builder: (context) => DataTransferIsolateController(),
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child: DataTransferPage(),
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);
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}
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}
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class DataTransferPage extends StatelessWidget {
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@override
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Widget build(context) {
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final controller = Provider.of<DataTransferIsolateController>(context);
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return SafeArea(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Container(
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child: Text(
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'Number Generator Progress',
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style: Theme.of(context).textTheme.title,
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),
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padding: EdgeInsets.all(8),
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),
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LinearProgressIndicator(
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value: controller.progressPercent,
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backgroundColor: Colors.grey[200],
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),
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Expanded(
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child: RunningList(),
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),
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Column(
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children: [
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RaisedButton(
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child: const Text('Transfer Data to 2nd Isolate'),
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color: (controller.runningTest == 1)
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? Colors.blueAccent
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: Colors.grey[300],
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onPressed: () => controller.generateRandomNumbers(false),
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),
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RaisedButton(
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child: const Text('Transfer Data with TransferableTypedData'),
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color: (controller.runningTest == 2)
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? Colors.blueAccent
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: Colors.grey[300],
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onPressed: () => controller.generateRandomNumbers(true),
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),
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RaisedButton(
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child: const Text('Generate on 2nd Isolate'),
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color: (controller.runningTest == 3)
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? Colors.blueAccent
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: Colors.grey[300],
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onPressed: controller.generateOnSecondaryIsolate,
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),
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],
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),
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],
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),
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);
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}
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}
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class DataTransferIsolateController extends ChangeNotifier {
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Isolate _isolate;
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ReceivePort _incomingReceivePort;
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SendPort _outgoingSendPort;
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final currentProgress = <String>[];
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int runningTest = 0;
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Stopwatch _timer = Stopwatch();
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double progressPercent = 0;
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Isolate get newIsolate => _isolate;
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bool get running => runningTest != 0;
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DataTransferIsolateController() {
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createIsolate();
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listen();
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}
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Future<void> createIsolate() async {
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_incomingReceivePort = ReceivePort();
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_isolate = await Isolate.spawn(
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_secondIsolateEntryPoint, _incomingReceivePort.sendPort);
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}
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void listen() {
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_incomingReceivePort.listen((dynamic message) {
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if (message is SendPort) {
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_outgoingSendPort = message;
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}
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if (message is int) {
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currentProgress.insert(
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0, '$message% - ${_timer.elapsedMilliseconds / 1000} seconds');
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progressPercent = message / 100;
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}
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if (message is String && message == 'done') {
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runningTest = 0;
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_timer.stop();
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}
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notifyListeners();
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});
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}
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void generateOnSecondaryIsolate() {
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if (running) return;
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runningTest = 3;
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currentProgress.clear();
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_timer = Stopwatch();
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_timer.start();
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_outgoingSendPort.send('start');
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notifyListeners();
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}
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Future<void> generateRandomNumbers(bool transferableTyped) async {
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if (running) {
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return;
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}
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if (transferableTyped) {
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runningTest = 2;
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} else {
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runningTest = 1;
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}
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var random = Random();
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currentProgress.clear();
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_timer.reset();
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_timer.start();
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List<int> randNums = [];
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for (int i = 0; i < 100; i++) {
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randNums.clear();
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for (int j = 0; j < 1000000; j++) {
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randNums.add(random.nextInt(100));
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}
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if (transferableTyped) {
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final transferable =
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TransferableTypedData.fromList([Int32List.fromList(randNums)]);
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await sendNumbers(transferable);
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} else {
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await sendNumbers(randNums);
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}
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}
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}
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Future<void> sendNumbers(dynamic numList) async {
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return Future<void>(() {
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_outgoingSendPort.send(numList);
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});
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}
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void dispose() {
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super.dispose();
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_isolate?.kill(priority: Isolate.immediate);
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_isolate = null;
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}
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}
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class RunningList extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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final progress =
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Provider.of<DataTransferIsolateController>(context).currentProgress;
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return DecoratedBox(
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decoration: BoxDecoration(
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color: Colors.grey[200],
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),
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child: ListView.builder(
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itemCount: progress.length,
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itemBuilder: (context, index) {
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return Column(
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children: [
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Card(
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child: ListTile(
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title: Text(progress[index]),
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),
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color: Colors.lightGreenAccent,
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),
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Divider(
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color: Colors.blue,
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height: 3,
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),
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],
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);
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},
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),
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);
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}
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}
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Future<void> _secondIsolateEntryPoint(SendPort sendPort) async {
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var receivePort = ReceivePort();
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sendPort.send(receivePort.sendPort);
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int length = 1;
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receivePort.listen(
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(dynamic message) async {
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if (message is String && message == 'start') {
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await generateAndSum(sendPort, createNums(), length);
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sendPort.send('done');
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} else if (message is TransferableTypedData) {
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await generateAndSum(
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sendPort, message.materialize().asInt32List(), length);
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length++;
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} else if (message is List<int>) {
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await generateAndSum(sendPort, message, length);
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length++;
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}
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if (length == 101) {
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sendPort.send('done');
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length = 1;
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}
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},
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);
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}
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Iterable<int> createNums() sync* {
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var random = Random();
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for (int i = 0; i < 100000000; i++) {
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yield random.nextInt(100);
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}
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}
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Future<void> generateAndSum(
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SendPort callerSP,
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Iterable<int> iter,
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int length,
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) async {
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int sum = 0;
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int count = 1;
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for (int x in iter) {
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sum += x;
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if (count % 1000000 == 0) {
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callerSP.send((count ~/ 1000000) * length);
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}
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count++;
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}
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return sum;
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}
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