Akka/Scala example source code file (WriteJournalBase.scala)

This example Akka source code file (WriteJournalBase.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

actor, akka, boolean, collection, journal, persistence, persistentrepr, resequenceable, some, writejournalbase

The WriteJournalBase.scala Akka example source code

/**
 * Copyright (C) 2014 Typesafe Inc. <http://www.typesafe.com>
 */

package akka.persistence.journal

import akka.persistence.{ PersistentRepr, Resequenceable }
import akka.actor.Actor
import scala.collection.immutable

private[akka] trait WriteJournalBase {
  this: Actor ⇒

  protected def preparePersistentBatch(rb: immutable.Seq[Resequenceable]): immutable.Seq[PersistentRepr] =
    rb.filter(persistentPrepareWrite).asInstanceOf[immutable.Seq[PersistentRepr]] // filter instead of flatMap to avoid Some allocations

  private def persistentPrepareWrite(r: Resequenceable): Boolean = r match {
    case p: PersistentRepr ⇒
      p.prepareWrite(); true
    case _ ⇒
      false
  }

}