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

This example Akka source code file (FailureDetectorPuppet.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

akka, atomicreference, boolean, cluster, down, event, eventstream, failuredetector, failuredetectorpuppet, remote, status, unit, unknown, up

The FailureDetectorPuppet.scala Akka example source code

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */

package akka.cluster

import java.util.concurrent.atomic.AtomicReference
import akka.remote.testkit.MultiNodeConfig
import akka.remote.FailureDetector
import com.typesafe.config.Config
import akka.event.EventStream

/**
 * User controllable "puppet" failure detector.
 */
class FailureDetectorPuppet(config: Config, ev: EventStream) extends FailureDetector {

  trait Status
  object Up extends Status
  object Down extends Status
  object Unknown extends Status

  private val status: AtomicReference[Status] = new AtomicReference(Unknown)

  def markNodeAsUnavailable(): Unit = status.set(Down)

  def markNodeAsAvailable(): Unit = status.set(Up)

  override def isAvailable: Boolean = status.get match {
    case Unknown | Up ⇒ true
    case Down         ⇒ false
  }

  override def isMonitoring: Boolean = status.get != Unknown

  override def heartbeat(): Unit = status.compareAndSet(Unknown, Up)

}