Play Framework

Play Framework
Mahmut Karakaya

Agenda
- Theory
- What Play Solves
- Architecture
- Play History
- Web Evolution

Agenda
- Practice
- Simple MVC operations
- NIO
- Scala

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

The Web Evolved
- Static (just html)
- Dynamic (get date from server on page :) )
* Structured (mvc, jsp, jsf )
- Realtime (ajax)

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)

Demo
- Create new application
- Download latest activator
https://www.playframework.com/download
play new demo
play ~run
http://localhost:9000

IDE support
play eclipse
play idea

Controller
public class HelloWorld extends Controller{
public static Result index(){
return ok("Hello World");
}
}

conf / routes
GET /hello
controllers.HelloWorld.index()

Controller - add a parameter
public static Result helloName(String name){
return ok("Hello World: "+ name);
}

conf / routes - add a parameter
GET /helloName
controllers.HelloWorld.helloName(name)
http://localhost:9000/helloName?
name=TestUser

conf / routes - add a parameter to URL
GET /helloName/:name
controllers.HelloWorld.helloName(name)
http://localhost:9000/hello/TestUser

Controller - parameter type check
public static Result helloNameAge(String name, int
age){
return ok("Hello World "+name +” you are ”
+age);
}
}

conf / routes - parameter type check
GET /hello/:name/:age
controllers.HelloWorld.helloNameAge(name:String,age:Int)
http://localhost:9000/hello/TestUser/10

Add a view
@(name: String, age:Int)
@main("Welcome to Play") {
<html>
<head></head>
<body>

Hello @name, you are @age years old

</body>
</html>
}

Controller - call view
public static Result index(String name, int age){
return ok(views.html.helloWorld.render(name,age));
}
}

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);
}

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);
}
});
}

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));
}
}));}

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}]

Scala
object HelloWorldScala extends Controller {
def index = Action {
Ok("Hello World Scala")
}
}

Scala Console
play console
import controllers.HelloWorld
HelloWorld.hello

Heroku supports Play
heroku create
heroku git:remote -a playAppForHeroku
git push heroku master

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 :)

Thank you
Codes are available at;
https://github.com/mkarakaya/playDemo.git

Play Framework

More Related Content

What's hot

Similar to Play Framework

Recently uploaded

Play Framework