1. SignalRity
Yaniv Rodenski
Senior Architect – Sela Group
Level: Intermediate - Advanced

2. The way I used to get my data

3. The way She is Getting her Data

4. How do I get my data?

5. Real-Time Web

6. SignalRity
Yaniv Rodenski
Senior Architect – Sela Group
Level: Intermediate - Advanced

7. About me:
• Senior Architect - Sela Group
• Windows Azure MVP
• Coauthor of Developing Windows Azure
and Web Services (MOC 20487)

8. Evolution of the real-time web
Polling
Long Polling
Forever-Frame
Server-sent Events
WebSockets

9. Demo
Using WebSockets

10. Why WebSockets are not Enough?
• HTML5 standard – great if you are
living in 2020
• Low-level API
• Strict prerequisites

11. Introducing SignalR
• Rich API for real-time web applications
• Supports WebSockets
• Fallback to other mechanisms

12. Hubs
• Hubs are high-level SignalR APIs
• Provide a service-like abstraction
• Provide a mechanism for invoking client
methods

13. Demo
Hello Hubs

14. Targeting Specific Clients
• When a client calls a hub, it gets a
connection id
• You can use this connection id to send a
message to this specific client
Clients.Client(connectionId).sendMessage(message)

15. Groups
• Clients can be registered with a group
• Part of the Hubs API
Groups.Add(Context.ConnectionId, groupName);
Clients.Group(groupName).invokeSomeClientMethod(args…);

16. Demo
Clients and Groups

17. Scaling out with SignalR
• One of the biggest issues with the “real-
time web” is scaling out
• SignalR can span across multiple hosts
using either Redis, SQL Server or
Windows Azure Service Bus

18. Demo
Scaling out with Windows Azure

19. SignalR .NET Clients
• You can create SignalR clients in any .NET
environment
– .NET applications
– Windows 8, Windows Phone 8 Apps
– Even Silverlight
– Xamarin

20. Demo
A .NET Client

21. Summary
• Real-time web does not need to be painful
• SignalR can let you use the best available
option
• SignalR is not just for web clients
• SignalR scales

22. Resources
• http://signalr.net/
• Twitter: @DamianEdwards, @davidfowl
• http://sdrv.ms/152qU0b
• @YRodenski