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![What else?
Play is REST-ful
❖ Matches the web architecture which is stateless
➢ the state will be stored on the other tiers
(Cookie, Database,Cache Server)
❖ Easy testing, easy sharing, easy bookmarking
➢ an url is what you need
❖ Horizontal scalability
# Routes
# This file defines all application routes (Higher priority routes first)
GET / controllers.Application.index
GET /:timeout controllers.Application.asyncURLGet(timeout: Int, url:String)
GET /clients/$id<[0-9]+> controllers.Clients.show(id: Long)
GET /clients controllers.Clients.list(page: Int ?= 1)
GET /hello/:name controllers.Application.hello(name:String)
Play has a powerful URL rooting
➔ url should be established before coding
➔ more complicated routing can be achieved by extending
GlobalSettings or by defining your own Router
➔ even more can be done with PathBindable
➔ also possible to do reverse routing
routes.Application.hello("Bob")
Play has a very simple config
Play is a modern web framework
● application.conf
environment="development"
db.default.url = "jdbc:mysql://127.0.0.1:3306/mydb"
…
● production.conf
include "application.conf"
environment="production"
db.default.url = ${?MYSQL_URL}](https://image.slidesharecdn.com/playframework-productivityformula1-131001132049-phpapp01/85/Play-framework-productivity-formula-4-320.jpg)
![Some Code Example
Request -> is the request performed by the client
Action -> something which converts a request into a response
Response -> Is the HTTP Response with Status Code, Cookies, Headers, Body
BodyParser -> a function that transforms the request body in a Scala (or Java) value, based on Content-Type of the
request
object Application extends Controller {
def index = Action {
Ok("It works!")
}
def hello(name: String) = Action {
Ok("Hello " + name)
}
}
GET / controllers.Application.index
GET /hello/:name controllers.Application.hello(name:String
The above example is not getting any reference from the incoming request, but we have another Action builder that takes as an
argument a function Request => Result:
def index = Action { request =>
Ok("Got request [" + request +
"]")
}
Simple example of serving a response
routes file
Action(parse.text) { request =>
val text = request.body
Ok("Got request " + text )
}
We can use a body parser in order to read the request.
In this example we will use the play.api.mvc.BodyParsers
parse.text -> parses the body as text if the Content-Type is text/plain.](https://image.slidesharecdn.com/playframework-productivityformula1-131001132049-phpapp01/85/Play-framework-productivity-formula-5-320.jpg)
![Some other features
Database evolutions
evolutions.use.locks=true
database locks are used to ensure that only
one host applies any Evolutions
# Users schema
# --- !Ups
CREATE TABLE User (
id bigint(20) NOT NULL
AUTO_INCREMENT,
email varchar(255) NOT NULL,
password varchar(255) NOT NULL,
fullname varchar(255) NOT NULL,
isAdmin boolean NOT NULL,
PRIMARY KEY (id)
);
# --- !Downs
DROP TABLE User;
when running on multiple hosts only use evolutions if you are using
Postgres or Oracle
Anorm, simple SQL data access
Plugins
classes that extend the Plugins trait
conf/play.plugins file
10000:my.example.FirstPlugin
10001:my.example.SecondPlugin
<priority>:<classname>
def enabled : Boolean
def onStart (): Unit
def onStop (): Unit
in
can overwrite the following methods
conf/evolutions/default/1.sql
conf/evolutions/default/2.sql
...
Dependency injection
Activator
Spring
Subcut
Macwire
Guice
val appDependencies = Seq( javaJpa, "org.hibernate" %
"hibernate-entitymanager" % "3.6.9.Final")
Unit testing
Junit -> java
Specs2 -> scala
integration with Selenium
No built-in JPA implementation in Play, but you can add
Hibernate
SQL("Select name,indepYear from Country")().map {
row =>
row[String]("name") -> row[Int]("indepYear")
}](https://image.slidesharecdn.com/playframework-productivityformula1-131001132049-phpapp01/85/Play-framework-productivity-formula-12-320.jpg)
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Play framework productivity formula
- 1. Play Framework (Scala) ProductivityFormula by Sorin Chiprian
- 2. What is Play? Playis a cool framework Easy to learn Play supports both Scala & Java
- 3. What do Ilike most Best error reporting ever seen Hit refresh and works (this applies for configurations, templates or code changes)
- 4. What else? Play isREST-ful ❖ Matches the web architecture which is stateless ➢ the state will be stored on the other tiers (Cookie, Database,Cache Server) ❖ Easy testing, easy sharing, easy bookmarking ➢ an url is what you need ❖ Horizontal scalability # Routes # This file defines all application routes (Higher priority routes first) GET / controllers.Application.index GET /:timeout controllers.Application.asyncURLGet(timeout: Int, url:String) GET /clients/$id<[0-9]+> controllers.Clients.show(id: Long) GET /clients controllers.Clients.list(page: Int ?= 1) GET /hello/:name controllers.Application.hello(name:String) Play has a powerful URL rooting ➔ url should be established before coding ➔ more complicated routing can be achieved by extending GlobalSettings or by defining your own Router ➔ even more can be done with PathBindable ➔ also possible to do reverse routing routes.Application.hello("Bob") Play has a very simple config Play is a modern web framework ● application.conf environment="development" db.default.url = "jdbc:mysql://127.0.0.1:3306/mydb" … ● production.conf include "application.conf" environment="production" db.default.url = ${?MYSQL_URL}
- 5. Some Code Example Request-> is the request performed by the client Action -> something which converts a request into a response Response -> Is the HTTP Response with Status Code, Cookies, Headers, Body BodyParser -> a function that transforms the request body in a Scala (or Java) value, based on Content-Type of the request object Application extends Controller { def index = Action { Ok("It works!") } def hello(name: String) = Action { Ok("Hello " + name) } } GET / controllers.Application.index GET /hello/:name controllers.Application.hello(name:String The above example is not getting any reference from the incoming request, but we have another Action builder that takes as an argument a function Request => Result: def index = Action { request => Ok("Got request [" + request + "]") } Simple example of serving a response routes file Action(parse.text) { request => val text = request.body Ok("Got request " + text ) } We can use a body parser in order to read the request. In this example we will use the play.api.mvc.BodyParsers parse.text -> parses the body as text if the Content-Type is text/plain.
- 6. Inside Play Play hasa MVC stack with a template system Templates Scala-based template engine Template markup syntax @(title: String, content: String) <!DOCTYPE html> <html> <head> <title>@title</title> </head> <body> @content </body> </html> Ok(views.html.main("title","content")) Templates and assets are compiled so any error will be displayed immediately app → Application sources └ assets → Compiled asset sources └ stylesheets → Typically LESS CSS sources └ javascripts → Typically CoffeeScript sources └ controllers → Application controllers └ models → Application business layer └ views → Templates conf → Configurations files and other non-compiled resources └ application.conf → Main configuration file └ routes → Routes definition public → Public assets └ stylesheets → CSS files └ javascripts → Javascript files └ images → Image files project → sbt configuration files └ build.properties → Marker for sbt project └ plugins.sbt → sbt plugins & declaration for Play itself logs → Standard logs folder └ application.log → Default log file target → Generated stuff test → source folder for unit or functional tests myProject
- 7. Where is thefun? Load Balancer Play Server Play Server Play Server This is what we have until now - it’s cool but no fun -
- 8. This is fun!!! Load Balancer Play Server Play Server Play Server Cloud Service Memcache Service Database Cloud Storage Cloud Service Cloud Service !!! The remote services latency in a threaded model could mean trouble !!!
- 9. Solving the issue Playis built on top of Akka and Netty ➔ you can use non-blocking I/O when making calls to remote services In high traffic environments, thread pools management is painful ❖ make threads on the fly ➢ This is expensive inefficient ❖ use a thread pool with too few threads ➢ run up of threads -> latency issues ❖ use a thread pool with too many threads ➢ context switching overhead ➢ Memory overhead Play comes with a WS Library WS.url(url).withHeaders("headerKey" -> "headerValue").get() ➔ request reading is also async ➔ enables: ◆ WebSockets ◆ Comet Attention the database access most probably will not be async
- 10. Some async example Thiscan get even more fun
- 11. Play it’s productionready Play is already being used by companies like: Play is scalable Instant deployment on but you can found instruction for: Cloudbees Cloud Foundry Clever Cloud
- 12. Some other features Databaseevolutions evolutions.use.locks=true database locks are used to ensure that only one host applies any Evolutions # Users schema # --- !Ups CREATE TABLE User ( id bigint(20) NOT NULL AUTO_INCREMENT, email varchar(255) NOT NULL, password varchar(255) NOT NULL, fullname varchar(255) NOT NULL, isAdmin boolean NOT NULL, PRIMARY KEY (id) ); # --- !Downs DROP TABLE User; when running on multiple hosts only use evolutions if you are using Postgres or Oracle Anorm, simple SQL data access Plugins classes that extend the Plugins trait conf/play.plugins file 10000:my.example.FirstPlugin 10001:my.example.SecondPlugin <priority>:<classname> def enabled : Boolean def onStart (): Unit def onStop (): Unit in can overwrite the following methods conf/evolutions/default/1.sql conf/evolutions/default/2.sql ... Dependency injection Activator Spring Subcut Macwire Guice val appDependencies = Seq( javaJpa, "org.hibernate" % "hibernate-entitymanager" % "3.6.9.Final") Unit testing Junit -> java Specs2 -> scala integration with Selenium No built-in JPA implementation in Play, but you can add Hibernate SQL("Select name,indepYear from Country")().map { row => row[String]("name") -> row[Int]("indepYear") }
- 13. What would youtry Java or Scala try the samples folder