Scala Reactive Programming

Actor's postRestart() lifecycle method

As discussed in the previous lifecycle method, the Actor's Supervisor decides to restart this Actor when it throws any exception. Its Supervisor makes a call to the Actor's postRestart() method immediately so that the Actor enters into the Restarted state.

This postRestart() method, in turn, makes a call to that Actor's preStart() method:

trait Actor{ 
  def preStart(): Unit = () 
  def postStop(): Unit = () 
  def preRestart(reason: Throwable, message: Option[Any]): Unit = { 
    context.children foreach { child ⇒ 
      context.unwatch(child) 
      context.stop(child) 
    } 
    postStop() 
  } 
  def postRestart(reason: Throwable): Unit = { 
    preStart() 
  } 
} 

Refer to the Akka Actor's lifecycle example section for the full example to understand ...