Web e device in real time con ASP.NET SignalRGiuseppe MarchiMicrosoft MVP SharePoint

Luca ZulianMCTS ASP.NET 4

What is SignalR?Under the Hood

Building Apps with SignalR

SignalR outside .NET Framework

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Performance & testing _21

What is SignalR for Developers?

• A library for ASP.NET developers that simplifies the process of adding real-time functionality

• An Open Source library (github.com/SignalR/SignalR)

• Well Documented library (asp.net/signalr)• Always up to date

What SignalR offers to Developers

• Real-time, persistent connection abstraction over HTTP for .NET (supports Web Sockets, and falls back to other compatible techniques for older browsers)

• Simplicity• Reach• Performance• Scalability• Security• Extensibility

SignalR: under the hood

Before Start: Components• Meta Package (Microsoft.AspNet.SignalR)• Core (Microsoft.AspNet.SignalR.Core)• Hosts (Microsoft.AspNet.SignalR.SystemWeb,

Microsoft.AspNet.SignalR.Owin)• Clients (Microsoft.AspNet.SignalR.Js,

Microsoft.AspNet.SignalR.Client)• Scaleout Buses

(Microsoft.AspNet.SignalR.Redis, Microsoft.AspNet.SignalR.ServiceBus)

DEMO

Simplicity: two level APIChoose the level of abstraction that works for you

Two level API: ConfigurationRemember: call RouteTable.Routes.MapHubs() as the first line of code in the Application_Start method, this must be called before you register any other routes.

Two level API: Hub ConfigurationRemember: call RouteTable.Routes.MapConnection() as the first line of code in the Application_Start method, this must be called before you register any other routes.

Two level API: PersistentConnection

• Low-level• Simple endpoint for sending

single-recipient, grouped, or broadcast messages

• Gives direct access to the low-level communication protocols

• PersistentConnection class

• Connect, reconnect & disconnect semantics

Two level API: PersistentConnection

PersistentConnection API

Two level API: PersistentConnection

DEMO

Two level API: Hub• More high-level pipeline• Allows your client and

server to call methods each other directly (internal routing)

• Allows you to pass strongly typed parameters to methods, enabling model binding

• Hub class• Automatic client proxy

generation (Javascript)

Two level API: HubHub API

Two level API: Hub

DEMO

Simplicity: Javascript client• Javascript proxy (AUTOMATICALLY created on

~/signalr/hubs)

Simplicity: Windows8 & WP8 client

• Microsoft.AspNet.SignalR.Client• Hub

• PersistentConnection

Transport NegotiationSignalR isolates us from low-level details, giving us the impression of working on a permanently open persistent connection

But isn’t real-time web just chat?

• Dashboards & monitoring• Collaborative anything• Job progress• Real-time forms• Gaming• …

SignalR outside .NET framework

• SignalR-ObjC - Native for iOS clients

• SignalA - Native for Android clients

• Xamarin (in xamarin branch https://github.com/SignalR/SignalR/tree/xamarin, but need some tricks)

SignalR on IIS?Supported server operating systems• Windows Server 2012• Windows Server 2008 r2.• Windows 8• Windows 7• Windows Azure

Supported .NET Framework versions• SignalR is supported on both .NET Framework version 4 and 4.5. For

WebSockets to be supported, .NET Framework 4.5 must be used.

Supported IIS versions• IIS 8 or IIS 8 Express• IIS 7 and 7.5. Support for extensionless URLs is required• IIS must be running in integrated mode; classic mode is not supported• The hosting application must be running in full trust mode

SignalR only on IIS?

• Console Applications, Windows Services (Microsoft.AspNet.SignalR.SelfHost)

• OWIN (Microsoft.AspNet.SignalR.Owin)

• Mono

SignalR performance & testing

• SignalR Crank or Stress projects from repository

• Performance Monitor (Perfmon.exe)

SignalR performance & testing

• Connections Connected

• Connections Reconnected

• Connections Disonnected

• Connections Current• Connection Messages

Received Total• Connection Messages

Sent Total• Connection Messages

Received/Sec• Connection Messages

Sent/Sec

SignalR Performance Counter

SignalR performance considerations

Reducing message size• JsonIgnore attribute• JsonProperty attribute to reduce message size

Modify SignalR configuration settings• DefaultMessageBufferSize

Modify ASP.NET configuration settings• Maximum concurrent requests per CPU• Request Queue Limit

Modify IIS configuration settings• Max concurrent requests per application

Q&A

Contatti

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