Web Sockets in Java EE 7
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This document summarizes a presentation on Web Sockets in Java EE 7. The presentation introduces Web Sockets and their history and protocol. It discusses how Web Sockets are now supported in Java EE 7 and includes a demo. The presentation addresses limitations of older technologies for real-time applications and how Web Sockets enable true real-time capabilities in a standards-based way natively supported by browsers.
![Challenge - Response
Challenge by Client
Sec-WebSocket-Key : Key (Random 128 bits -> Base 64)
Response By Server
Sec-WebSocket-Accept : Key + GUID* (SHA1)
[NOT FOR SECURITY]
* 258EAFA5-E914-47DA- 95CA-C5AB0DC85B11 (RFC 6455)](https://image.slidesharecdn.com/websocketsinjavaee7-130223020138-phpapp02/85/Web-Sockets-in-Java-EE-7-29-320.jpg)
Web Sockets in Java EE 7
- 1. Java Day Web Sockets in Java EE 7 February 23, 2013 Sivasubramaniam Arunachalam @sivaa_in http://www.meetup.com/BangaloreOpenJUG/events/102904102/
- 2. It’s me! • Application Developer • Web/Enterprise/Middleware/B2B • Java/Java EE, Python/Django • 2002 • Technical Consultant • Process Mentor • Speaker
- 3. Agenda • Introduction to Web Sockets • History • Protocol Spec • Adoption • Java EE 7 Support • Demo
- 4. Tweet Ping
- 5. Web 1.0 Web 2.0 Web 3.0 Web 4.0
- 6. 600+ M Active Users/Day https://www.facebook.com/sitetour/chat.php
- 7. 1991 http:// 1995 Still 22 Years Old 2013 http?
- 8. http/tcp (1991) (1974) request / response State less ~ 2k bytes ~ 150 ms
- 9. ~ Real Time
- 10. Pull Based (Polling) Periodic Polling (JS/AJAX) Latest Score? AUS 312/7 Latest Score? Same Latest Score? Same Server Client Latest Score? AUS 316/7 Latest Score? Same
- 11. Push Based (Comet) Server Push/Long Polling (JS/AJAX/iframe) Latest Score? AUS 312/7 Latest Score? Server Client AUS 316/7 Latest Score?
- 12. • Request / Response • Too Many • Server Connections • Heavy Headers • Outdated Content
- 13. Streaming Server Side Hack Latest Score? AUS 312/7 (1/n) Server Client AUS 316/7 (2/n) IND 0/0 (n/n)
- 14. Latest Score? (1/n) AUS 312/7 (n-1 to go) Server Server Buffer Client AUS 316/7 (2/n) AUS 312/7 (n-2 to go) AUS 316/7 IND 0/0 IND 0/0 (n/n) PROXY
- 15. Others • RTMP • Adobe • Are you Still using Flash? • RTD • Windows/Excel • Non Web
- 16. Web Sockets (to rescue)
- 17. The Web Socket Way The Original Route Hey Server! Hi Client! Update me the Score AUS 312/7 Server Client AUS 316/7 IND 0/0 Not Interested. Bye
- 18. Hey Server! Hi Client! Update me the Score AUS 312/7 Update Over info too (93.0 ov) Server (94.0 ov) Client AUS 316/7 (95.0 ov) IND 0/0 (0.0 ov) Not Interested. Bye
- 19. The Background
- 20. Let’s Meet Next Year (2014) http://www.tavendo.de/webmq/resources/faq
- 21. Server Side Client Side • Hand Shake • Java Script API • Data Transfer • Browser Behavior RFC 6455 http://www.tavendo.de/webmq/resources/faq
- 22. Fundamentals • tcp + http • Full Duplex (Bi-Directional) • Native Browser Support • No Hacks • Not Limited to Web
- 23. The Spec • 80 / 443 (plain/secure) • No Proxy/Firewall pains • Stream of Messages (Not Bytes) • ws:// & wss:// • Only ONE Connection (up/down streams)
- 24. Still Why? 2 Bytes Header 1000 x (for each message) ~ 50 ms (Latency) 3x
- 25. 1 Message/Second per Client 1,000 clients 10,000 clients 1,00,000 clients http://www.codeproject.com/Articles/437342/DotNet-WebSocket-Programming
- 26. The Upgrade • GET (request) • 101 (response code) • Not 200 OK • http:// -> ws://
- 27. Client Request GET /demo HTTP/1.1 Origin : http://sivaa.in Host : sivaa.in Connection : Upgrade Upgrade : WebSocket WebSocket-Protocol : json, chat, <protocol> WebSocket-Version : 10 WebSocket-extensions : compression, <extn>
- 28. Server Response HTTP/1.1 101 Switching Protocols Connection : Upgrade Upgrade : WebSocket WebSocket-Protocol : json, chat, <protocol> WebSocket-Origin : http://sivaa.in WebSocket-Location : ws://sivaa.in/demo
- 29. Challenge - Response Challenge by Client Sec-WebSocket-Key : Key (Random 128 bits -> Base 64) Response By Server Sec-WebSocket-Accept : Key + GUID* (SHA1) [NOT FOR SECURITY] * 258EAFA5-E914-47DA- 95CA-C5AB0DC85B11 (RFC 6455)
- 30. Client / Server Peer <-> Peer
- 31. Data Transfer • Frames (TCP) • • No request / response behavior • No Correlation too • Independent • # of requests != # of responses
- 32. And No • Headers • Cookies • Authentication
- 33. Sub Protocols • Custom Message Patterns • Technical / Business • Request / Response • 1–1 • 1 to Many • Acknowledgements
- 34. Ping / Pong • Keep-Alive Client -> Ping • Heart Beat Server -> Pong • Latency Metrics • N/W Status Probing • Detect Failed Connections
- 35. Browser Support http://caniuse.com/#feat=websockets
- 36. IDL (Java Script) Server Support http://www.w3.org/TR/websockets/
- 41. Developer Friendly 1. var ws = new WebSocket("ws://sivaa.in/demo"); CONNECTING 2. ws.onopen = function() { ws.send("Hello Server!"); OPEN }; 3. ws.onmessage = function(event) { alert("Reply from Server " + event.data); }; n-1. ws.send("This is the message sent by the client"); n. ws.close() CLOSING CLOSED
- 42. The Guards (Proxy / Firewall) • Closing Long Lived Connections • Unresponsive Server • Buffering Server Response • Non Encryption • More Latency
- 43. Web Sockets and The Guards • Web Sockets doesn’t Proxy • Stripping HTTP Headers • Upgrade • Options to disable • Rejecting Server Response • Frames (HTTP Headers Expected) • wss:// - No issues
- 44. The Hidden Blades • 301 • Limited Support • Inconsistent Behavior
- 45. Java EE 7 & Web Socket • JSR 356 • Java EE 7 • Tyrus ( http://tyrus.java.net/ ) • Web Socket SDK • Reference Implementation
- 46. Server Side Capabilities (Expected) • Handshake Response to Clients • Source/Origin Check • URI Resolving & Matching • Sub Protocols Negotiation • Extension Negotiation
- 47. Handlers • End point (to handle life cycle events) • Session (Current Active Session) • Remote End Point (Peer) • Message Handler (incoming messages) • Error Handler
- 49. Web Server Support • Apache Tomcat 7 • GlassFish 3.1 • Jetty 7 • JBoss 7 • And much more
- 50. GlassFish • Annotations • Reference Implementation • Web Sockets SDK / mvn • Samples to Begin with
- 51. Demo • GlassFish Promoted Build • # svn checkout https://svn.java.net/svn/websocket-sdk~source-code-repository • # mvn clean install (in websocket-sdk~source-code-repositorytrunksamples) • Import in Latest Net Beans • Run it
- 52. Thank You! siva@sivaa.in bit.ly/sivaa_in bit.ly/sivasubramaniam
- 53. References • http://www.inc.com/ss/brief-history-time-management#7 • http://resources3.news.com.au/images/2013/01/30/1226564/845955-tim-berners-lee.jpg • http://netdna.webdesignerdepot.com/uploads/2009/01/macii.jpg#old%20apple%20computer%20559x450 • http://3.bp.blogspot.com/_zVkfb2MIt4A/S8f_qzhuhRI/AAAAAAAAAjg/2idf7_G4wxo/s1600/apple-imac.png • http://www.softwareforeducation.com/wikileki/images/c/c4/Simplex-half-full.gif • http://www.mediafly.com/wp-content/uploads/Speed_Rocket-2.png • http://weaponsman.com/wp-content/uploads/2013/01/thumbs-down.png • http://m.flikie.com/ImageData/WallPapers/d1bef9f8be6d479387953929c766699a.jpg • http://www.tavendo.de/webmq/resources/faq • http://deadliestwebattacks.com/tag/websocket/ • http://en.wikipedia.org/wiki/WebSocket • http://www.infoq.com/articles/Web-Sockets-Proxy-Servers