SignalR for ASP.NET Developers
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This document provides an overview of ASP.NET SignalR, a library for building real-time web functionality. It discusses traditional web application approaches using request-response, defines what "real-time" means in terms of pushing data from server to client. It introduces SignalR as a library that uses push technology to provide persistent connections and real-time functionality. It also covers SignalR's transport techniques including websockets, server-sent events, forever frames, and long polling, as well as the types of connections in SignalR including persistent connections and hubs.
![Traditional Web Approach
Sends a Request to the Server – (Step 1)
[In other words, the Client is trying to
pull some information from the Server]
SERVER
CLIENT
Response Sent back to the Client – (Step 3)
Processes
the Request
(Step 2)](https://image.slidesharecdn.com/signalrforasp-netdevelopers-130330052206-phpapp02/85/SignalR-for-ASP-NET-Developers-3-320.jpg)
SignalR for ASP.NET Developers
- 2. Topics Focused On!!! • Traditional Web Approach • What does “Real Time” mean? • SignalR – “The Rockstar” • Quick Glance at - Transport Techniques • Types of Connections • How do I get SignalR? • Demo
- 3. Traditional Web Approach Sends a Request to the Server – (Step 1) [In other words, the Client is trying to pull some information from the Server] SERVER CLIENT Response Sent back to the Client – (Step 3) Processes the Request (Step 2)
- 4. Real Time Web Applications
- 5. What is Real Time Web Application? • In simple terms, “Real Time” means an immediate response being sent by the Server to the Client. • Real Time is all about “Pushing” instead of “Pulling” • Push Technology is completely different from Pull Technology. Its about getting told what’s new, instead of asking for what’s new!!! • Facebook, Twitter, Yahoo Cricket Live, Stock Ticker
- 6. Real Time Web Approach User Sends a Request to the Server CLIENT Creates a Persistent Connection between them SERVER Response Sent back to the Client Response Sent back to the Client Response Sent back to the Client
- 7. SignalR – The Rockstar • SignalR is an asynchronous library. Used to develop Real Time Web Application. • Concept intiated by “David Fowler” and “Damien Edwards” • Provides Client to Server persistent connection over HTTP. • Makes use of Push Technology. • Provides Abstraction over the set of transports. • Open Source available on Github!!!
- 8. SignalR Transport Connections Techniques
- 9. Transport Priority WebSockets Server-Sent events Forever Frame (IE hack) Long Polling
- 10. WebSocket • A new transport technique which came up with HTML5. • It internally works on top of TCP protocol. Pros Cons Full-duplex persistent Supported only on latest connection (both ways) browsers – (IE 10) Fastest solution Works only with IIS-8.0
- 11. Server Sent Events • Requires a single connection between Client-Server. • Uses Javascript API – “EventSource” through which Client can request a particular URL to receive data stream. • Used to send Message Notifications or Continuous Data Streams. Pros Cons No need to reconnect Works in server-to-client direction only Not supported in IE
- 12. Forever Frames • Data is sent out in chunks. • Internally creates an Iframe along with a script on the page to fetch the data. Pros Cons Supported on IE Browser. Iframes are loaded again and again with chunks of data. All script tags remain on the page
- 13. Long Polling Server Response Request Variable delay Client Time: requests event ‘n’ seconds (variable)
- 14. SignalR Connections Hubs Persistent Connection
- 15. Persistent Connection • Provides a raw / low-level control to manage connection. • Contain events like “OnConnection”, “OnDisconnection”, “OnReconnection” • We can write our own logic in these events.
- 16. Hubs • Provides a High-level API. • Client calling Server. • Server calling Clients. (All, Groups, One). • Broadcasting messages to all connected clients. • Works in a similar way like a “Controller”
- 17. How do I get SignalR?
- 22. Routing is Very Important!!!
- 24. Client Calling Server Function
- 25. DEMO