Intro to signalR
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This presentation introduces ASP.NET SignalR, a library for adding real-time functionality to web applications. SignalR allows for bidirectional communication between server and client via persistent connections. It was explained that SignalR chooses the best network transport based on client capabilities, with WebSockets being the ideal method. The presentation covered the SignalR API, including hubs for high-level communication and persistent connections for lower-level access. A demo of a SignalR chat application was shown to demonstrate its use. Security concerns with SignalR were also briefly discussed.
Intro to signalR
- 1. Introducing ASP.NET SignalR Presenter: Richi Padhi, Mindfire Solutions Date: 7/1/2015
- 2. Presenter: Richi Padhi, Mindfire Solutions Agenda Introduction How SignalR works? SignalR API & Architecture Demo Security
- 3. Presenter: Richi Padhi, Mindfire Solutions Introduction
- 4. Presenter: Richi Padhi, Mindfire Solutions Introduction What is SignalR? ASP.NET SignalR is a library for ASP.NET developers that simplifies the process of adding real-time web functionality to applications. Library to maintain asynchronous (non blocking threads) over persistent connection in ASP.NET applications. What is "real-time web" functionality? Real-time web functionality is the ability to have server code push content to connected clients instantly as it becomes available, rather than having the server wait for a client to request new data. Example : Chat, Email, Stock Ticker, Game Live Score, Real-Time Gaming, Document Collaboration
- 5. Presenter: Richi Padhi, Mindfire Solutions Introduction >> SignalR provides a simple API for creating server-to-client remote procedure calls (RPC) that call JavaScript functions in client browsers (and other client platforms) from server-side .NET code. >> SignalR also includes API for connection management (for instance, connect and disconnect events), and grouping connections also it handles connection management automatically. >> It can reach out to thousands of clients using Service Bus, SQL Server or Redis. >> Abstracts away the network layer for bidirectional real-time communications, thus helping developers focus on building application.
- 6. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works?
- 7. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works? >> SignalR allows bidirectional communication between client & server over persistant connections >> It provides simple APIs for RPC >> SignalR chooses the best fit transport mechanisms for the given client and server environment. >> Manages and gives fine grained control over network layer and also has an auto fallback mechanism.
- 8. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works?
- 9. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works? Order of network transports HTML 5 Transports : >> WebSockets >> Server Sent Events Comet Transports (long-held HTTP request) : >> Forever Frame >> Ajax Long Polling
- 10. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works? WebSockets >> A new HTML5 API that enables bi-directional, full duplex communication between the browser and server. >> It is the new standard defined as a part of HTML 5 to solve two major problems of current web: Overhead of HTTP (Network Throughput) Low Latency >> Standardized
- 11. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works? Server Sent Event >> A technology where a browser receives automatic updates from a server via HTTP connection. The Server-Sent Events EventSource API is standardized as part of HTML5 >> This was also possible before, but the web page would have to ask if any updates were available. With server-sent events, the updates come automatically. >> Supported in all major browsers, except Internet Explorer.
- 12. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works? Forever Frame >> Forever Frame creates a hidden IFrame which makes a request to an endpoint on the server that does not complete. The server then continually sends script to the client which is immediately executed, providing a one-way realtime connection from server to client. >> The connection from client to server uses a separate connection from the server to client connection, and like a standard HTML request, a new connection is created for each piece of data that needs to be sent.
- 13. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works? Ajax Long Polling >> Long polling does not create a persistent connection, but instead polls the server with a request that stays open until the server responds, at which point the connection closes, and a new connection is requested immediately. >> This may introduce some latency while the connection resets.
- 14. Presenter: Richi Padhi, Mindfire Solutions How SignalR Works? Fallback
- 15. Presenter: Richi Padhi, Mindfire Solutions SignalR API & Architecture
- 16. Presenter: Richi Padhi, Mindfire Solutions SignalR API & Architecture The SignalR API contains two models for communicating between clients and servers: Persistent Connections & Hubs Connection A Connection represents a simple endpoint for sending single-recipient, grouped, or broadcast messages. Persistent Connections >> Low level access to communication >> Direct developer access to network pipeline >> Access to lot more communication events >> Will be familiar to developers who have used connection-based APIs such as WCF
- 17. Presenter: Richi Padhi, Mindfire Solutions SignalR API & Architecture Hubs >> High level abstraction >> Built on top of Persistent Connections >> Least developer work >> Works for majority of user >> Will be familiar to developers who have used remote invocation APIs such as .Net Remoting.
- 18. Presenter: Richi Padhi, Mindfire Solutions SignalR API & Architecture Architecture
- 19. Presenter: Richi Padhi, Mindfire Solutions Demo
- 20. Presenter: Richi Padhi, Mindfire Solutions Demo >> First SignalR application >> SignalR Hub and jQuery Demo
- 21. Presenter: Richi Padhi, Mindfire Solutions Security
- 22. Presenter: Richi Padhi, Mindfire Solutions Security
- 23. Presenter: Richi Padhi, Mindfire Solutions Security
- 24. Presenter: Richi Padhi, Mindfire Solutions References http://www.asp.net/signalr http://signalr.net/ http://www.pluralsight.com/courses/signalr-across-web-devices https://github.com/SignalR/SignalR/wiki
- 25. Presenter: Richi Padhi, Mindfire Solutions Question and Answer
- 26. Presenter: Richi Padhi, Mindfire Solutions Thank you ! :)