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SignalR Real-time Application Cookbook

SignalR Real-time Application Cookbook

By : Roberto Vespa
4.6 (9)
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SignalR Real-time Application Cookbook

SignalR Real-time Application Cookbook

4.6 (9)
By: Roberto Vespa
Buy this Book

Overview of this book

Table of Contents (18 chapters)
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SignalR Real-time Application Cookbook
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SignalR Real-time Application Cookbook
Credits
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Credits
About the Author
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About the Author
Acknowledgments
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Acknowledgments
About the Reviewers
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About the Reviewers
www.PacktPub.com
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www.PacktPub.com
Preface
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Preface
Lock Free Chapter
1
Understanding the Basics
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Understanding the Basics
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Introduction
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Adding a Hub to an ASP.NET project
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Adding a Hub to a self-hosting application
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Connecting to a Hub from a JavaScript client
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Connecting to a Hub from a .NET application
2
Using Hubs
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Using Hubs
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Introduction
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Adding a method to a Hub and counting the calls to it
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Calling back the caller from a Hub's method
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Broadcasting to all connected clients
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Adding a connection to a group
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Removing a connection from a group
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Broadcasting to all connected clients except the caller
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Broadcasting to all clients except the specified ones
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Broadcasting to all clients in a group except the caller
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Broadcasting from outside a Hub
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Using the return value of a Hub method
3
Using the JavaScript Hubs Client API
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Using the JavaScript Hubs Client API
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Introduction
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Starting a Hub connection
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Setting up connection transport strategies
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Calling a server-side Hub method
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Adding a client-side method on the proxy and calling it from the server
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Managing errors across a complex asynchronous workflow
4
Using the .NET Hubs Client API
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Using the .NET Hubs Client API
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Introduction
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Starting a Hub connection
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Setting up connection transport strategies
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Calling a server-side Hub method
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Adding a client-side method on the proxy and calling it from the server
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Managing errors across a complex asynchronous workflow
5
Using a Persistent Connection
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Using a Persistent Connection
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Introduction
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Adding and registering a persistent connection
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Sending messages from the server
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Sending messages to the server
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Exchanging messages between a server and a JavaScript client
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Exchanging messages between a server and a .NET client
6
Handling Connections
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Handling Connections
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Introduction
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Controlling the lifetime of a connection
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Handling a connection transient state
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Establishing a cross-domain connection
7
Analyzing Advanced Scenarios
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Analyzing Advanced Scenarios
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Introduction
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Generating static files for JavaScript proxies
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Authorizing requests on a Hub
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Authorizing requests on a persistent connection
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Authorizing requests in a self-hosting context
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Scaling up
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Scaling out with Azure
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Scaling out with Redis
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Scaling out with SQL Server
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Establishing proxy-less connections
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Introducing dependency injection (simple approach)
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Introducing dependency injection (advanced approach)
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Using dependency injection to replace a default behavior
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Extending the Hub pipeline
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Handling errors
8
Building Complex Applications
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Building Complex Applications
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Introduction
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Implementing a room-based chat application
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Implementing a shared whiteboard
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Implementing a real-time map of flying airplanes
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Implementing a "pets finder" application
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Implementing a custom backplane
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Implementing a real-time error notification system
1
Creating Web Projects
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Creating Web Projects
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Introduction
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Creating an empty ASP.NET web application
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Creating an ASP.NET web forms application
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Creating an ASP.NET MVC application
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Creating an MVC controller and a related view
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Creating an ASP.NET website
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Insights
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Insights
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Transport strategies
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Asynchronous programming and SignalR
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Index
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Index

Controlling the lifetime of a connection

SignalR lets us control several aspects of the connection lifetime on both the server and the client side. SignalR has the goal of delivering a simple experience based on the idea of a persistent connection, but we cannot really rely on the assumption that it will always be available, because too many factors may interfere with it. While it's true that SignalR does its best to isolate us from these kind of problems, thanks to smart connection strategies and recovery procedures, on the other hand we might need to have finer control over what's happening behind the scenes, and we might want to handle the anomalies and the reconnection procedures ourselves.

In this first recipe of the chapter, we'll use a Hub to illustrate how we can monitor when the connection state changes over time. Later, we will also write a simple JavaScript client in order to show how we can perform the same kind of checks on the client side.

Getting ready

Before writing the code...

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Programming languages
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SignalR Real-time Application Cookbook
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