4. Asynchronous Programming | Mastering DART

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Mastering DART

By : Akopkokhyants

4.6 (5)

Mastering DART

4.6 (5)

By: Akopkokhyants

Overview of this book

If you are an application developer who has experience with Dart and want to develop reusable and robust code in Dart, then this book is for you. You are expected to have a basic knowledge of core elements and applications.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Beyond Dart's Basics

1. Beyond Dart's Basics

Modularity and a namespace

Functions and closures in different scopes

Classes and mixins

Methods and operators

Summary

2. Advanced Techniques and Reflection

2. Advanced Techniques and Reflection

Generics

Errors versus exceptions

Annotations

Reflection

Summary

3. Object Creation

3. Object Creation

Creating an object

Summary

4. Asynchronous Programming

4. Asynchronous Programming

Call-stack architectures versus event-driven architectures

Future

Zones

Isolates

Summary

5. The Stream Framework

5. The Stream Framework

Why you should use streams

Single-subscription streams versus broadcast streams

An overview of the stream framework API

Summary

6. The Collection Framework

6. The Collection Framework

A Dart collection framework

Ordering of elements

Collections and generics

The collection class hierarchy

The Iterable interface

The Iterable interface

BidirectionalIterator

The collection classes

Unmodifiable collections

Choosing the right collection

Summary

7. Dart and JavaScript Interoperation

7. Dart and JavaScript Interoperation

Interoperation at a glance

The dart:js library

Type conversion

JsObject and instantiation

JsFunction and the this keyword

Dart with jQuery

Summary

8. Internalization and Localization

8. Internalization and Localization

The key principles

The Intl library

Internationalizing your web application

Extracting messages

Using Google Translator Toolkit

Using translated messages

Summary

9. Client-to-server Communication

9. Client-to-server Communication

Communication at a glance

Hypertext Transfer Protocol

AJAX polling request

AJAX long polling request

WebSocket

Summary

10. Advanced Storage

10. Advanced Storage

Cookies

Web Storage

Web SQL

IndexedDB

Summary

11. Supporting Other HTML5 Features

11. Supporting Other HTML5 Features

The notification APIs

The native drag-and-drop APIs

The geolocation APIs

Canvas

Summary

12. Security Aspects

12. Security Aspects

Web security

Securing a server

Securing a client

Security best practices

Summary

Index

Index

Future

Let's change the code from the previous section into async, as follows:

import 'dart:io';

main() {
  File file = new File("data.txt");
  file.open().then(processFile);
}

processFile(RandomAccessFile file) {
  file.length().then((int length) {
    file.read(length).then(readFile).whenComplete(() {
      file.close();
    });
  });
  }

readFile(List<int> content) {
  String contentAsString = new String.fromCharCodes(content);
  print("Content:  $contentAsString");
}

As you can see, the Future class is a proxy for an initially unknown result and returns a value instead of calling a callback function. Future can be created by itself or with Completer. Different ways of creating Future must be used in different cases. The separation of concerns between Future and Completer can be very useful. On one hand, we can give Future to any number of consumers to observe the resolution independently; on the other hand, Completer can be given to any number of producers and Future will be resolved...

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Tech Concepts

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Programming languages

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