> play new

Do you know
Web Application
Framework?

Do you know
Play!> framework?

Do you know
’’’ Scala?

[Start]
Playing!
@mumoshu

# of atnders
php
java
scala
js
python
perl
0
5
10
15

PHP vs Play
PHP
Symfony
naked?
Slim
CakePHP
<- thin
rich ->
Play!>

Play is
• A web application framework
• Ease common tasks in web dev

Play basics
•Easy start
•Simple development
•Scala

Play basics
•Easy start
•Simple development
•Scala

How to start
•Download
•Unzip
•play new

Play basics
•Easy start
•Simple development
•Scala

How you develop
•play run
•Repeat:
•Write code!
•F5!

Play basics
•Easy start
•Simple development
•Scala

’’’ Scala
• Run on JVM
• A lot of Java libraries
• Hybrid language
• Imperative programming
• Object oriented programming
• Functional programming

Whats happy with FP
• Concurrency
• Scalability

Imperative vs
Functional
• Imperative Programming
do A -> state++,
do B -> state++, ...
• Functional programming
in1 -> f(x) -> out1
in2 -> g(x) -> out2

+ concurrency

Easy concurrency
• Imperative programming
do A -> state <- do B
> sudden conflict!!! <
• Functional programming
in1 -> f(x) -> out1, in2 -> g(x) -> out2
> no conflict!!! <

Easy scalability
• Single Play
req -> acion1(x) -> result
req -> acion2(x) -> result
...
• Multiple Play’s
req -> play1 -> result
req -> play2 -> result
...

Play basics
•Easy start
•Simple development
•Scala

Play basics
•Easy start
•Simple development
Hopeful!
•Scala

break
1/3
ビースト★ハーレム
∼野獣の甘噛み∼
http://pf.gree.jp/56616

Play specifics
•Documented
•Translated
•Pluggable
•Statically Typed

Documented
• 0ver 100 pages
• http://playframework.org/

Play specifics
•Documented
•Translated
•Pluggable
•Statically Typed

Translated
• Over 100 pages
• http://playdocja.appspot.com/

Play specifics
•Documented
•Translated
•Pluggable
•Statically Typed

Pluggable
• 27 plugins
• http://www.playframework.org/
documentation/2.0.4/Modules

Plugins
• LESS
• Redis
• SASS
• MongoDB
• CoffeeScript
• etc.
• TypeScript <- Me
modern web dev with
• Velocity <- FuRyu
a lot of plugins
• Memcached <- Me

Play specifics
•Documented
•Translated
•Pluggable
•Statically Typed

Statically Typed
• Can be freed from
• null/NULL
• Free from
• ReferenceError
• TypeError
• ‘Call to undefined function’

Statically Typed
vs Not ~ ?
• What we GET
if its NOT statically typed

You see
• careless mistakes
• typos
on runtime

NullPointerException

ReferenceError

TypeError

Call to undefined
function

Play specifics
•Documented
•Translated
•Pluggable
•Typed

Play specifics
•Documented
•Translated
• Productive!
Pluggable
•Typed

break
2/3
WEB+DB vol.71

Play 2.x
• We have Play 1.x, 2.0
• Play 2.1 is coming

Play 1.x
• Written in Java
• Supports Java and Scala
• Since 2009
• Stable

Play 2.0
• Written in Scala
• Supports Scala and Java
• Since 2012
• More scalability
• Typesafe Stack & Typesafe, Inc.

Play 2.1
• Features
• Improvements
• Changes

Play 2.1
Features
• Scala 2.10
• Scala’s Promise API
• Better JSON API
• Project templates & Scaffolding

Play 2.1
Improvements
• Run tests in Forked JVM
• Out of memory: PermGen Space
• Faster compile
• thanks to Scala 2.10 & SBT 0.12

Play 2.1
Changes
• Anorm to Slick(ScalaQuery)

Play 2.x is
•Active!

Recommendation
• Do you want to:
• write web apps in Java/Scala?
• try modern tech?

> play new

> play new

> play run

[Start]
Playing!
@mumoshu

Thank you!