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DART Cookbook

DART Cookbook

By : Ivo Balbaert
4 (2)
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DART Cookbook

DART Cookbook

4 (2)
By: Ivo Balbaert

Overview of this book

If you are a Dart developer looking to sharpen your skills, and get insight and tips on how to put that knowledge into practice, then this book is for you. You should also have a basic knowledge of HTML, and how web applications with browser clients and servers work, in order to build dynamic Dart applications.
Table of Contents (13 chapters)
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12
Index

Using isolates in web apps


In this recipe, you will learn how to use isolates in a web application in the project using_web_isolates. This example runs in the Dart VM embedded in a browser as well as compiled to JavaScript. In the latter case, it uses HTML5 Web workers, which runs in the background independently of other scripts without affecting the performance of the page.

How to do it...

The main isolate in using_web_isolates.dart runs the following code:

import'dart:isolate';
import'dart:html';
import'dart:async';

main() {
  Element output = querySelector('output');
  SendPortsendPort;
  ReceivePortreceivePort = new ReceivePort();
  receivePort.listen((msg) {
    if (sendPort == null) {
    sendPort = msg;
  } else {
  output.text += 'Received from isolate: $msg\n';
  }
});

String workerUri = 'worker.dart';
int counter = 0;
// start 3 isolates:
for (int i = 1; i <= 3; i++) {
  Isolate.spawnUri(Uri.parse(workerUri), [], receivePort.sendPort).then((isolate) {
    print('isolate spawned...

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