akka.NotUsed.scala Maven / Gradle / Ivy
/*
* Copyright (C) 2016-2019 Lightbend Inc.
*/
package akka
/**
* This type is used in generic type signatures wherever the actual value is of no importance.
* It is a combination of Scala’s `Unit` and Java’s `Void`, which both have different issues when
* used from the other language. An example use-case is the materialized value of an Akka Stream for cases
* where no result shall be returned from materialization.
*/
sealed abstract class NotUsed
case object NotUsed extends NotUsed {
/**
* Java API: the singleton instance
*/
def getInstance(): NotUsed = this
/**
* Java API: the singleton instance
*
* This is equivalent to [[NotUsed.getInstance]], but can be used with static import.
*/
def notUsed(): NotUsed = this
}
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