1. INTRODUCTION TO
PLAY 2.1
Thursday, 7 February 13

2. Matteo Depalo
CTO and Co-Founder @ Responsa
Twitter: @matteodepalo
Github: matteodepalo
Thursday, 7 February 13

3. 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
Thursday, 7 February 13

4. Scala
• Created by Martin Odersky in 2004
• Built on top of the JVM
• Both functional and OO
• Influenced by Haskell, Erlang, Smalltalk
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5. Play 2 vs Rails defaults
Play 2.1 Rails
Testing JUnit, Selenium TestUnit
ORM Anorm ActiveRecord
Templates Groovy ERB
Dependency
SBT Bundler
management
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6. Folder structure
Play Rails
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7. Controllers
Rails Play
class PostsController < ApplicationController package controllers
def index
@posts = Post.all import ...
respond_to do |format| object Posts extends Controller {
format.html
end def index = Action { implicit request =>
end Ok(views.html.rounds.index(Post.all()))
}
}
Thursday, 7 February 13

8. Play 2.1 async features
• Asynchronous Results
• Streaming
• WebSockets
• Comet
Thursday, 7 February 13

9. Asynchronous Results
def index = Action {
val futureInt = scala.concurrent.Future { intensiveComputation() }
Async {
futureInt.map(i => Ok("Got result: " + i))
}
}
Thursday, 7 February 13

10. Comet Sockets
def 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)
}
Same thing with Play helpers
def comet = Action {
val events = Enumerator("kiki", "foo", "bar")
Ok.stream(events &> Comet(callback = "console.log"))
}
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11. 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()
}
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12. JBoss Netty
• Framework for writing async network
applications.
• Support for:
• SPDY
• WebSockets
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13. Thanks
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