- Play 2.0 is a web framework for Java and Scala that simplifies development by embracing HTTP rather than fighting it - It takes a new approach to building web apps in Java by not being built on top of servlet APIs and using an asynchronous programming model - Developing, testing, and deploying a Play app locally and to CloudFoundry involves creating a project, running it locally, and pushing the compiled code to CloudFoundry which automatically detects and supports Play apps

1. Building Play 2.0
Applications on
CloudFoundry
Rajdeep Dua
Director, DevRel VMware India
@rajdeepdua

2. Why Play?

3. For years PHP, Ruby developers have
been laughing at Java developers
every time they change and refresh the
page

4. ..and all of us evolve
Grails
JVM Servlets JEE Spring
Play

5. ..and all of us evolve
Grails
JVM Servlets JEE Spring
Play

6. Play doesn’t fight HTTP or the
Browser

7. Play doesn’t fight HTTP or the
Browser
Stateless, HTTP Centric,
Easier development lifecycle

8. Play 2.0 Overview

9. Play 2.0 Overview
• Web framework written in Java and Scala

10. Play 2.0 Overview
• Web framework written in Java and Scala
• Not built on top of Servlet APIs

11. Play 2.0 Overview
• Web framework written in Java and Scala
• Not built on top of Servlet APIs
• Statically typed MVC Architecture

12. Play 2.0 Overview
• Web framework written in Java and Scala
• Not built on top of Servlet APIs
• Statically typed MVC Architecture
• Asynchronous HTTP Programming Model

13. Play 2.0 Overview
• Web framework written in Java and Scala
• Not built on top of Servlet APIs
• Statically typed MVC Architecture
• Asynchronous HTTP Programming Model
• Client side templating in Scala

14. Play 2.0 Overview
• Web framework written in Java and Scala
• Not built on top of Servlet APIs
• Statically typed MVC Architecture
• Asynchronous HTTP Programming Model
• Client side templating in Scala
• Server side code in Java or Scala

15. Anatomy of a Play 2.0
Application
-app App sources
-conf Configuration files
-dist Zip file deployed to Cloud Foundry
-logs Logs
-project sbt project files
-public public assets( js, css)
-target Generated sources

16. MVC
• Model : Domain Object Models map to a
persistence store
• Views :Rendered content using templates
• Controller : Routes Http requests using ActionS

17. Play Architecture
• Built as an extension of JBoss Netty Server
• All the requests are Asynch -- using nio
• Core Play is a pure Scala app which runs in
a JVM
• Stateless on the Server side

18. Play Application at Runtime

19. Play App Support in
Cloud Foundry
• Supports Play as one of the frameworks
• Auto-detected by vmc
• Support mysql and Postgres databases

20. Lifecycle of a Play app
in CloudFoundry
Install Play

21. Lifecycle of a Play app
in CloudFoundry
Install Play
Develop/Test Locally

22. Lifecycle of a Play app
in CloudFoundry
Install Play
$play new myapp
Develop/Test Locally [myapp]$run

23. Lifecycle of a Play app
in CloudFoundry
Install Play
$play new myapp
Develop/Test Locally [myapp]$run
Deploy on Cloud
Foundry

24. Lifecycle of a Play app
in CloudFoundry
Install Play
$play new myapp
Develop/Test Locally [myapp]$run
Deploy on Cloud $vmc push --path=dist/
myapp.zip
Foundry

25. Sample App

26. Todo List

27. App Structure : Router
# Home page
GET / controllers.Application.index()
# Map static resources from the /public folder to the /assets URL
path
GET /assets/*file controllers.Assets.at(path="/public", file)
# Tasks
GET /tasks controllers.Application.tasks()
POST /tasks controllers.Application.newTask()
POST /tasks/:id/delete controllers.Application.deleteTask(id: Long)

28. App Structure : Controller
public class Application extends
Controller {
public static Result index() {}
public static Result tasks() {}
public static Result newTask() {}
public static Result deleteTask(
Long id) {}
}

29. App Structure : Model
@Entity
public class Task extends Model {
@Id
public Long id;
@Required
public String label;
public static Finder<Long,Task>
find = new Finder(...);
public static void create(Task task)
{
task.save();
}
}

30. AppStructure :View
• Scala based template
• Compiled into a scala function with render
method
@(tasks: List[Task], taskForm: Form[Task])
@import helper._
@main("Todo list") {
<h1>@tasks.size() task(s)</h1>
....

31. Create a Task

32. List all the Tasks

33. Delete a Task

34. Demo

35. Summary

36. Summary
• Play 2.0 takes a new approach to Web app
development in Java world

37. Summary
• Play 2.0 takes a new approach to Web app
development in Java world
• Simplifies the development cycle

38. Summary
• Play 2.0 takes a new approach to Web app
development in Java world
• Simplifies the development cycle
• Frameworks should not fight HTTP but
embrace it

39. Questions