CODEWITHSUNDEEP
scala
Leibnitz
Leibnitz

Reputation: 355

Scala: Making config data as a global object

I have a case class for configuration parameters which is populated (using NO external library) before starting the actual application. I pass this config object through out the application and in too many places. Now the question is can this object be made global so I can refer it across the application as the values are going to be constant.

case class ConfigParam() extends Serializable {
  var JobId: Int = 0
  var jobName: String = null
  var snapshotDate: Date = null
}
val configParam = ???

val ss = getSparkSession(configParam) //Method call...

Upvotes: 1

Views: 250

Answers (1)

Krzysztof Atłasik
Krzysztof Atłasik

Reputation: 22595

Using ConfigParam as a global object could have bad implications for you. First of all, it will make harder to test any function which is using that global object.

Maybe you could just pass ConfigParam as an implicit argument?

For example, let's say you've got 3 functions:

def funA(name: String)(implicit configParam: ConfigParam): String = ???
def funB(number: Int)(implicit configParam: ConfigParam): String = ???
//you don't have to explicitily pass config param to funA or funB
def funC(name: String)(implicit configParam: ConfigParam): String = funA(name) + funB(100)

implicit val configParam = ??? //you need to initialise configParams as implicit val
funC("somename") //you can now just call funC without explicitly passing configParam
                 //it will be also passed to all function calls inside funC
                 //as long as they've got implicit parameter list with ConfigParam

Another solution could be to use some kind of dependency-injection framework, like guice.

Upvotes: 3

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