Realtime web experience with signalR presentation at the Israeli Web Developers group - WDCIL

1. © Copyright SELA software & Education Labs Ltd. 14-18 Baruch Hirsch St.Bnei Brak 51202 Israel
www.sela.co.il

2. What is “Real Time”
experience
“Real Time” web techniques
What is signalR
SignalR protocol
Connection & Hub
Groups and private
messages
.Net client
Self Hosting
Scaleout

3. WebSocket
ServerSentEvents
ForeverFrames
Long-Polling
Polling

5. • Not all servers support web sockets
• Not all network components support web sockets
• It’s API is limited

6. • Code once, deploy everywhere
• As cross-platform as possible
• Simple API to work with

7. • Open source project
• Abstraction layer over connection technique
• Can be self-hosted
• Call client methods from the server
WebSocket
ServerSentEvents
= ForeverFrames
Long-Polling
Polling

8. WebSocket SignalR
• Good performance • Abstraction layer
• Strict prerequisites • Reach API
• Limited API • Supports WebSocket

10. Negotiate request
Server
Client Negotiate response
Connection phase

12. • WebSocket-like API
• Lower level code
• Provides us with more control

14. • Abstraction over signalR connection
• Service-like API
• Call clients methods from the server

16. • You can use connection ID
• You can access a particular client by it
Clients.Client(connectionId).sendMessage(message)

17. • Part of Hub API
• Stored on client
• Not persistent

19. _connection = new
HubConnection("http://localhost/RanWahle.Blog.SignalR.Demo");
IHubProxy proxy = connection.CreateHubProxy("soccerResultsHub");
_connection.Start().ContinueWith(
//define proxies
);
//invoke server methods
_proxy.Invoke(“HubServerMethod“ , args…));

21. • Three NuGet packages to install
• Create class with Configuration method.
• Map hub in the Configuration method
• Use the class as a type parameter to
WebApplication.Start

23. • signalR supports ASP.NET authentication &
authorization
• AuthorizeAttribute
• Accessing user data from context
• Authenticated request may downdgrade
to serverSentEvents in some clients.

25. • Install Redis for Linux or Clone the windows porting
• Add One line of code
• On Windows – run redis from command line
• Your app is ready to scaleout

27. Real time experience is more than
just polling
Using signalR can use the best
available technique
It can be self hosted
It can scale out
It has several clients

28. • http://www.asp.net/signalr
• http://signalr.net/
• Twitters:@signalr @DamianEdwards @davidfowl and
@DavianFowlwards
• http://blogs.Microsoft.co.il/blogs/ranw

30. © Copyright SELA software & Education Labs Ltd. 14-18 Baruch Hirsch St.Bnei Brak 51202 Israel
www.sela.co.il