Play framework

Play! framework
Agile web development.

Created by Guillaume Bort 2007

Sẩm Bảo Chung Web development with Play!

Agenda
Overview
Main Concept
 Five cool things you can do with play
 Fix the bug and hit Reload
 Simple stateless MVC architecture
 Efficient template engine
 Test driven development
 Job
Play enviroment
Discuss


Play Overview
Pure Java
More productive Java environment!
Targets Restful architectures
No compile, deploy, restart cycle - Fix the bug and hit
reload!
Clean template system - using Groovy, Scala template
Exact errors (including line numbers, even for templates)
Lots of built-in features for fast development
Starts fast, runs fast
Extensible by modules

Sẩm Bảo Chung Web development with Play

Main Concept

Simple stateless MVC architecture
Five cool things you can do with play
Fix the bug and hit Reload
Efficient template engine
JPA

Test driven development
Job


Play architecture MVC
The Play framework is fully stateless and
only request/response-oriented
4.AnHTTP Request is received by the
framework.
6.TheRouter component tries to find the
most specific route able to accept this
request.
8.The corresponding action method is
then invoked.
10.The application code is executed.
11.If a complex view needs to be
generated, a template file is rendered.
13.The result of the action method (HTTP
Response code, Content) is then written
as an HTTP Response.


Routes file
A routes file help play controller routine
the request

GET / Ap p l i c a t i o n . i n d e x
GET / u s e r /{ username } Ap p l i c a t i o n . showUser
POST / u s e r Ap p l i c a t i o n . c r e a t
eUs e r
DELETE / u s e r /{ username } Ap p l i c a t i o n . d e
l e t eUs e r
GET / p u b l i c staticDir:public


Model
A simple user

@Entity
public class User extends Model{

@Id
public long id;

@Required
@Column(unique = true)
public String username;

@Required
@Email
public String email;
}


Controller
UserController
public class Application extends Controller {
public static void index() {
List<User> users = User.findAll();
render(users);
}

public static void showUser(String username) {
User user = User.find("byUsername",
username).first();
notFoundIfNull(user);
render(user);
}


View
List users
(app/views/Application/index.html)
#{ extends ’main .html ’ /}
#{ set title :’Index ’ /}
<ul >
#{ list items :users , as:’user ’}
<li >
#{a @Application . showUser ( user .
username )}
${ user . username }
#{/ a}
with email address ${ user . email }
</li >
#{/ list }
</ul >


Five cool things of Play!
Bind an HTTP parameter to a Java method parameter

Redirect to an action by calling the corresponding Java
method
render(…) , renderText(…), renderXML(…),
renderJSON(…), renderBinary(…), redirect(…)


Don’t Repeat Yourself when passing Java objects to
templates
Play will automatically start the JPA Entity Manager
using Hibernate and magically synchronize it when code
is reloaded.


Straightforward file upload management

#{form @uploadPhoto(), enctype:'multipart/form-
data'} <input type="text" name="title" /> <input
type="file" id="photo" name="photo" /> <input
type="submit" value="Send it..." /> #{/}

public static void uploadPhoto(String title, File photo)
{ ...
}


Fix the bug and hit
Reload
Whenever an error occurs, the framework makes its best
effort to identify and show you the problem


Job
 Doing the right thing at the right time
• Scheduled jobs (housekeeping)
• Bootstrap jobs (initial data providing)
• Suspendable requests (rendering a PDF
report without blocking the
• connection thread pool)
/* @Every("1h") */
@OnApplicationStart
public class LoadDataJob extends Job {
public void doJob() {
/* .. do whatever you want */
}
}


Test driven development
The integrated test runner makes it easy for you do test-
driven development.


Getting start
Using the play command
When the framework is correctly installed, open a shell
and execute play.
$ play
You should see the play default message.


Getting start
Use the new command to create a new application.
# play new myApp


Getting start
You can start with command
# play run myApp


Modules
Some module on
http://www.playframework.org/modules
With:
Scala
Google App Engine
PDF Generation
SASS and SCSS
Google Web Toolkit
MongoDB
Simple search
Objectify
To install locally these modules use the install command:
play install gae-{version}
To add this module as dependency of your application, add it
to the dependencies.yml file:
require: - play -> gae {version}.


Play framework

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