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Play Framework
- 2. Agenda - Theory - What Play Solves - Architecture - Play History - Web Evolution
- 3. Agenda - Practice - Simple MVC operations - NIO - Scala
- 4. Waiting...
- 5. Threads
- 7. Play is not based on Java EE
- 8. MVC
- 9. Play - full stack web framework for JVM - fun and high productive - change code hit reload ( forget jRebel ) - browser error reporting - easy cloud deployment (e.g. Heroku) - stateless
- 10. Play 0.x - 05.2007
- 11. Play 1.0 - 05.2008
- 12. Play 1.2 - 04.2011
- 13. Play 2.0 - 03.2012
- 14. Notable websites using Play
- 15. The Web Evolved - Static (just html) - Dynamic (get date from server on page :) ) * Structured (mvc, jsp, jsf ) - Realtime (ajax)
- 16. Realtime Web - Polling (req - res) - Long polling (req - res when changed) - Server sent events (req - res -res -res) - Websocket (req - res - res - req -res whatever)
- 17. 1 request = 1 thread
- 18. NIO 1 request != 1 thread
- 19. Demo - Create new application - Download latest activator https://www.playframework.com/download play new demo play ~run http://localhost:9000
- 20. IDE support play eclipse play idea
- 22. Controller public class HelloWorld extends Controller{ public static Result index(){ return ok("Hello World"); } }
- 23. conf / routes GET /hello controllers.HelloWorld.index()
- 24. Controller - add a parameter public static Result helloName(String name){ return ok("Hello World: "+ name); }
- 25. conf / routes - add a parameter GET /helloName controllers.HelloWorld.helloName(name) http://localhost:9000/helloName? name=TestUser
- 26. conf / routes - add a parameter to URL GET /helloName/:name controllers.HelloWorld.helloName(name) http://localhost:9000/hello/TestUser
- 27. Controller - parameter type check public class HelloWorld extends Controller{ public static Result helloNameAge(String name, int age){ return ok("Hello World "+name +” you are ” +age); } }
- 28. conf / routes - parameter type check GET /hello/:name/:age controllers.HelloWorld.helloNameAge(name:String,age:Int) http://localhost:9000/hello/TestUser/10
- 29. Add a view @(name: String, age:Int) @main("Welcome to Play") { <html> <head></head> <body> <p> Hello <b> @name</b>, you are <b>@age</b> years old </p> </body> </html> }
- 30. Controller - call view public class HelloWorld extends Controller{ public static Result index(String name, int age){ return ok(views.html.helloWorld.render(name,age)); } }
- 31. Error handling
- 32. WS lib for non-blocking http call public static Result callGoogle() { play.libs.F.Promise<play.libs.WS.Response> response=WS.url("http://google.com" ).get(); Promise<Result> result= response.map(toResult); return async(result); }
- 33. NIO parallel call example - non blocking call public static Promise<Timing> timedRequest( final String url){ final long start = System.currentTimeMillis(); Promise<Response> res= WS.url(url).get(); return res.map(new Function<Response,Timing> (){ public Timing apply (Response response){ long latency=System.currentTimeMillis() -start; return new Timing(url,latency,start); } }); }
- 34. NIO parallel call example - non blocking call public static Result index(){ Promise<List<Timing>> all= Promise.waitAll( Timing.timedRequest("http://www.yahoo.com"), Timing.timedRequest("http://www.google.com"), Timing.timedRequest("http://www.bing.com") ); return async(all.map(new play.libs.F.Function<List<Timing>,Result>(){ public Result apply(List<Timing> timings){ return ok (play.libs.Json.toJson(timings)); } }));}
- 35. NIO parallel call example - result [{"url":"http://www.yahoo.com" ,"latency":1542,"start":1408296474891}, {"url":"http://www.google.com" ,"latency":366,"start":1408296474912}, {"url":"http://www.bing.com" ,"latency":437,"start":1408296474913}]
- 36. Scala object HelloWorldScala extends Controller { def index = Action { Ok("Hello World Scala") } }
- 37. Scala Console play console import controllers.HelloWorld HelloWorld.hello
- 38. Heroku supports Play heroku create heroku git:remote -a playAppForHeroku git push heroku master
- 39. Reference - https://www.playframework.com/ - Play For Scala (Manning) - Learning Play! Framework 2 (Andy Petrella) - Play For Java (Manning) - People like Sadek Drobi, Yevgeniy Brikman, James Ward :)
- 40. Thank you Codes are available at; https://github.com/mkarakaya/playDemo.git