Making it possible/mandatory to signal which ExecutionContext will actually execute something scheduled

akka-docs/scala/code/docs/actor/FaultHandlingDocSample.scala

@@ -91,6 +91,7 @@ class Worker extends Actor with ActorLogging {
   var progressListener: Option[ActorRef] = None
   val counterService = context.actorOf(Props[CounterService], name = "counter")
   val totalCount = 51
+  import context.dispatcher // Use this Actors' Dispatcher as ExecutionContext
 
   def receive = LoggingReceive {
     case Start if progressListener.isEmpty ⇒
@@ -103,7 +104,6 @@ class Worker extends Actor with ActorLogging {
       counterService ! Increment(1)
 
       // Send current progress to the initial sender
-      import context.dispatcher // Use this Actors' Dispatcher as ExecutionContext
       counterService ? GetCurrentCount map {
         case CurrentCount(_, count) ⇒ Progress(100.0 * count / totalCount)
       } pipeTo progressListener.get
@@ -143,6 +143,8 @@ class CounterService extends Actor {
   var backlog = IndexedSeq.empty[(ActorRef, Any)]
   val MaxBacklog = 10000
 
+  import context.dispatcher // Use this Actors' Dispatcher as ExecutionContext
+
   override def preStart() {
     initStorage()
   }

akka-docs/scala/code/docs/actor/SchedulerDocSpec.scala

@@ -19,6 +19,9 @@ import akka.testkit._
 class SchedulerDocSpec extends AkkaSpec(Map("akka.loglevel" -> "INFO")) {
   "schedule a one-off task" in {
     //#schedule-one-off-message
+    //Use the system's dispatcher as ExecutionContext
+    import system.dispatcher
+
     //Schedules to send the "foo"-message to the testActor after 50ms
     system.scheduler.scheduleOnce(50 milliseconds, testActor, "foo")
     //#schedule-one-off-message
@@ -42,6 +45,9 @@ class SchedulerDocSpec extends AkkaSpec(Map("akka.loglevel" -> "INFO")) {
         case Tick ⇒ //Do something
       }
     }))
+    //Use system's dispatcher as ExecutionContext
+    import system.dispatcher
+
     //This will schedule to send the Tick-message
     //to the tickActor after 0ms repeating every 50ms
     val cancellable =