Microsoft Summit 2013the ultimate business and

technology conferenceArchitecture & Best

Practices Track

Real-time fluent communication using SignalR and CloudRadu VunvuleaiQuest Group

Scope

What?Why?

When?Where?

How?

Agenda• Internet in our days• Fluent communication• Connection methods• Security• Performance• Scalability• Conclusion

{“name” : “Radu Vunvulea,“company” : “iQuest Group”,“userType” : “enthusiastic”“technologies” : [“Azure”, “.NET”, “JS”, “Web”, “Mobile”, “WPF”, “SL” ],“expertise” : [“enterprise”, “pharma”, “automotive”, “home automation”, “e-Commerce” ],“blog” : “vunvulearadu.blogspot.com”,“email” : ”vunvulear@outlook.com”,“socialMedia” :

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“@RaduVunvulea”,“fb” : “radu.vunvulea”

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Who am I?

Internet in our days

Internet during the time• Real Time Web• Real Time Libraries & Web

SocketFuture

• Ajax• jQuery & Prototype

Present

• Static Web• HTML & Request/ResponsePast

Fluent communication

Real Time InteractionChatNotificationsWeatherStock marketCommerce

AuctionGamesMonitoringDashboardDocument editing

Current solutions

WebSocketForever FrameServer Send EventsPoolingSPDY

Available FrameworksCommetPusherSockJSSocketIOFaye

Now.jsSseDjango-sseCrampOpenPush

Available FrameworksCommetPusherSockJSSocketIOFaye

Now.jsSseDjango-sseCrampOpenPush

SignalR

What is SignalR• Async library for .NET to help build real-

time, multiuser interactive web applications

• Bidirectional communication• Adopted by Microsoft• Open Source• GitHub

Supported PlatformsServer• Windows (.NET)• Linux (Mono)Clients• IE, Chrome, Firefox, Safari, Opera, Android

Brower • IoS, Windows Desktop, Silverlight,

Windows Store, Windows Phone …

Connection Methods

Connection Methods

WebSocket

Server Side Events

Forever Frame

Ajax long pooling

Persistent ConnectionSimilar with WebSocket• Persistent• Events• Connect• Disconnect• Receive• Error

Methods• Send• Broadcast

HubsOver Persistent ConnectionsShare variablesCalls between client and serverSerialization

Capture connect/disconnect Everything works by magic

HubsWhen you have multiple hubs• Same connection is

shared by a client• Groups are

maintained separately for each hub

• One proxy JS file for all hubs

Async support• OnConnected• OnDisconnected• OnReconnected• proxy.State (JS)• Client.Caller (C#)

Demo

Hubs vs Persistent ConnectionsHubs• Remote invocation• Easy to use and

manage• Best for simple use

cases

Persistent Connections• Message format

needs to be specified

• Messaging and dispatching model

• An existing app is ported to SignalR

Security

SecurityConnection Token • Connection

Id+Username• Unique• Managed by server• Encrypted with a digital

signature

SecurityConnection Id • Exists until the end of

connectionUsername• Only for authenticated

users• Passed between client

and server for each request

CSRF

Disable cross domain requests

Verify connection token

Put connection token in query string

The connection token is not persisted on the client

Performance

PerformanceSingle Box• Over 450.000 messages

per second• 15.000 – 20.000

connections (hardware limitations – ports)

PerformanceWeb farm• You have “NO” limit • You need to synchronize

each node from the farm

Solution

SignalR FarmBackplanes:• Windows Azure Service

Bus• Redis• SQLServer

Server broadcast High-frequency realtime Client to client

Server Server

Backplane

Demo

Conclusion

ConclusionSignalR is great for:• Client to Server communication• Server to Client communication• Broadcasting• Real Time Applications• Scalable Solutions• Low latency

Question

Answers

Thank you{

“name” : “Radu Vunvulea, “blog” : “vunvulearadu.blogspot.com”, “email” : ”vunvulear@outlook.com”,“socialMedia” :

{“twitter” :

“@RaduVunvulea”,“fb” : “radu.vunvulea”

}}