CODEWITHSUNDEEP
scalaplayframework-2.2
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Reputation: 7288

Play Framework: Access and manipulate global variable

I'm currently building an accounting app, now I want to persist this "Period End Date" that is changeable. I believe we can use global variable, however I don't know how to do so. What I have tried so far is to create a variable in application.conf like this application.date="2014/12/15".

Moreover, I'm not sure how to change the value using above approach . Is there any good approach for this problem ?

Upvotes: 4

Views: 3358

Answers (1)

Andreas Neumann
Andreas Neumann

Reputation: 10884

A possible way to go is to use a Singeleton Object which is initialized in the Global.scala.

The Global Object has to go in the scala-root of the application or to be configured through application.conf.

Singleton for shared Data

in app/shared/Shared.scala(the name is free)

package shared

object Shared {
 private var data: Int = 0

 def setData(d: Int) : Unit = data = 0 
 def getData : Int = data
}

In application.conf you can set the Global to be called on start of the application (you could also just put a file called Global.scala in app, that would be used by default)

application.global= settings.Global
shared.initial = 42

In app/settings/Global.scala

object Global extends GlobalSettings {
  override def onStart(app: Application) {
   // Here I use typesafe config to get config data out of application conf
   val cfg: Config = ConfigFactory.load()
   val initialValue = cfg.getInt(shared.initial)
   // set initial value for shared
   Shared.setData(initialValue)
  }
}

In Play code to get or set the shared data.

import shared.Shared

Shared.getData
Shared.setData( 8 )

Upvotes: 4

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