Play 2 pip

INTRODUCTION TO PLAY 2.1

Thursday, 7 February 13

Matteo DepaloCTO and Co-Founder @ Responsa

Twitter: @matteodepaloGithub: matteodepalo


Play Framework

• Play 1 released 2008 only with Java support

• Play 2 released March 2012, totally rebuilt with Scala

• Inspired by Rails and Django

• Now part of the Typesafe Framework including Scala and Akka


Scala

• Created by Martin Odersky in 2004

• Built on top of the JVM

• Both functional and OO

• Influenced by Haskell, Erlang, Smalltalk


Play 2 vs Rails defaultsPlay 2.1 Rails

Testing JUnit, Selenium TestUnit

ORM Anorm ActiveRecord

Templates Groovy ERB

Dependency management

SBT Bundler


Folder structureRailsPlay


ControllersRails Play

package controllers

import ...

object Posts extends Controller {

def index = Action { implicit request => Ok(views.html.rounds.index(Post.all())) }

}

class PostsController < ApplicationController def index @posts = Post.all

respond_to do |format| format.html end end


Play 2.1 async features

• Asynchronous Results

• Streaming

• WebSockets

• Comet


Asynchronous Results

def index = Action { val futureInt = scala.concurrent.Future { intensiveComputation() }

Async { futureInt.map(i => Ok("Got result: " + i)) }}


Comet Socketsdef comet = Action { val events = Enumerator( """<script>console.log('kiki')</script>""", """<script>console.log('foo')</script>""", """<script>console.log('bar')</script>""" )

Ok.stream(events >>> Enumerator.eof).as(HTML)}

def comet = Action { val events = Enumerator("kiki", "foo", "bar") Ok.stream(events &> Comet(callback = "console.log"))}

Same thing with Play helpers


Schedule tasks

import play.api.libs.concurrent.Execution.Implicits._

Akka.system.scheduler.schedule(0.seconds, 30.minutes, testActor, "tick"

)

Akka.system.scheduler.scheduleOnce(10.seconds) { file.delete()}


JBoss Netty

• Framework for writing async network applications.

• Support for:

• SPDY

• WebSockets


Thanks


Play 2 pip

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