with the frameworkK.Gautam

About Play!Launched in 2008Open SourceJava

About play!Stateless server side architecture

Bonus points if you guess relation between the picture and this slide

No servlet API !

About play !

Naan Appadiye Shock Aaiten

About play !Full stack web framework

About play !Inspired by

PhilosophySimpleEfficientDRYConvention over configurationShare nothing

Why no servlets ?

Database

Session

Session

Thread Pool

requests

In play !

Database

Worker Threads

Play is stateless in the server

Browser

STATEPlay server

Play server

Database

Encrypted cookie

Sessions and CacheSession is play! can store only 4KTo store objects use Cache

Getting startedModelsControllersViews

ModelsSupports JPA

@Entitypublic class Product { public String name; public Integer price;}

Controllerspackage controllers;import models.Client;import play.mvc.Controller;public class Clients extends Controller { public static void show(Long id) { Client client = Client.findById(id); render(client); } public static void delete(Long id) { Client client = Client.findById(id); client.delete(); } }

ViewsGroovy template engineExpressions: ${…}

<h1>Client ${client.name}</h1>

Scripts: %{…}%

%{ fullName = client.name.toUpperCase()+' '+client.forname;}% <h1>Client ${fullName}</h1>

Views contd..Actions: @{…}

<h1>Client ${client.name}</h1><p> <a href="@{Clients.showAccounts(client.id)}">All accounts</a></p><hr /><a href="@{Clients.index()}">Back</a>

JobsPlaying with Jobspackage jobs; import play.jobs.*; public class MyJob extends Job { public void doJob() { // execute some

application logic here ... } }

Image courtesy http://static.themetapicture.com/media/funny-Steve-Jobs-cool-photo.jpg

Resulting Jobspackage jobs; import play.jobs.*; public class MyJob extends Job<String> { public String doJobWithResult() { // execute some application logic here ... return result; } }

Timed Jobsimport play.jobs.*; @Every("1h")public class Bootstrap extends Job { public void doJob() { List<User> newUsers =

User.find("newAccount = true") .fetch();

for(User user : newUsers) { Notifier.sayWelcome(user); } }}

Asynchronous HTTPpublic static void generatePDF(Long reportId) { Promise<InputStream> pdf =

new ReportAsPDFJob(report).now();

InputStream pdfStream = await(pdf); renderBinary(pdfStream);}

Websocketspublic static void echo() { while(inbound.isOpen()) { WebSocketEvent e = await(inbound.nextEvent()); for(String quit: TextFrame.and(Equals("quit")).match(e)) { outbound.send("Bye!"); disconnect(); } for(String msg: TextFrame.match(e)) { outbound.send("Echo: %s", frame.textData); } for(WebSocketClose closed: SocketClosed.match(e)) { Logger.info("Socket closed!"); } }}

Dependency Managementdependencies.yml# Application dependenciesrequire: - play 1.2 - com.google.guava -> guava r07

play dependencies --sync

Deployment optionsplay start mysuperwebapp

JEE Application servers

play war myapp -o myapp.war

Cloud based hosting● AWS elastic Beanstalk● Google appEngine● Heroku● Cloud Foundry● Openshift DIY

● May be even Windows Azure

Copyright NoticeI do not own any of the images.All images are copyright of the respective owners.

I just found them on the internet

If you are the owner of any of the images thank you for your permission.

Thank you !