Changes according to review. #2513

akka-docs/rst/java/code/docs/pattern/SchedulerPatternTest.java

@@ -8,26 +8,23 @@ import akka.actor.*;
 import akka.testkit.*;
 import akka.testkit.TestEvent.Mute;
 import akka.testkit.TestEvent.UnMute;
-import org.junit.After;
+import org.junit.*;
-import org.junit.Before;
-import org.junit.Ignore;
-import org.junit.Test;
 import scala.concurrent.util.Duration;
 import scala.concurrent.util.FiniteDuration;
 import java.util.Arrays;
 import java.util.concurrent.TimeUnit;
 
-public class SchedulerPatternTestBase {
+public class SchedulerPatternTest {
 
-  ActorSystem system;
+  static ActorSystem system;
 
-  @Before
+  @BeforeClass
-  public void setUp() {
+  public static void setUp() {
     system = ActorSystem.create("SchedulerPatternTest", AkkaSpec.testConf());
   }
 
-  @After
+  @AfterClass
-  public void tearDown() {
+  public static void tearDown() {
     system.shutdown();
   }
 
@@ -38,9 +35,10 @@ public class SchedulerPatternTestBase {
     private final Cancellable tick = getContext().system().scheduler().schedule(
       Duration.create(500, TimeUnit.MILLISECONDS),
       Duration.create(1000, TimeUnit.MILLISECONDS),
-      getSelf(), "tick", getContext().system().dispatcher());
+      getSelf(), "tick", getContext().dispatcher());
     //#schedule-constructor
-    ActorRef target;
+    // this variable and constructor is declared here to not show up in the docs
+    final ActorRef target;
     public ScheduleInConstructor(ActorRef target) {
       this.target = target;
     }
@@ -75,7 +73,8 @@ public class SchedulerPatternTestBase {
   //#schedule-receive
   public class ScheduleInReceive extends UntypedActor {
     //#schedule-receive
-    ActorRef target;
+    // this variable and constructor is declared here to not show up in the docs
+    final ActorRef target;
     public ScheduleInReceive(ActorRef target) {
       this.target = target;
     }
@@ -85,7 +84,7 @@ public class SchedulerPatternTestBase {
     public void preStart() {
       getContext().system().scheduler().scheduleOnce(
         Duration.create(500, TimeUnit.MILLISECONDS),
-        getSelf(), "tick", getContext().system().dispatcher());
+        getSelf(), "tick", getContext().dispatcher());
     }
 
     // override postRestart so we don't call preStart and schedule a new message
@@ -99,7 +98,7 @@ public class SchedulerPatternTestBase {
         // send another periodic tick after the specified delay
         getContext().system().scheduler().scheduleOnce(
           Duration.create(1000, TimeUnit.MILLISECONDS),
-          getSelf(), "tick", getContext().system().dispatcher());
+          getSelf(), "tick", getContext().dispatcher());
         // do something useful here
         //#schedule-receive
         target.tell(message, getSelf());
@@ -164,6 +163,7 @@ public class SchedulerPatternTestBase {
       Iterable<akka.testkit.EventFilter> filter =
         Arrays.asList(new akka.testkit.EventFilter[]{
           (akka.testkit.EventFilter) new ErrorFilter(ArithmeticException.class)});
+      try {
         system.eventStream().publish(new Mute(filter));
 
         final ActorRef actor = system.actorOf(props);
@@ -182,8 +182,10 @@ public class SchedulerPatternTestBase {
           }
         };
         system.stop(actor);
-
+      }
+      finally {
         system.eventStream().publish(new UnMute(filter));
       }
     }
   }
+}

akka-docs/rst/java/code/docs/pattern/SchedulerPatternTest.scala

@@ -1,9 +0,0 @@
-/**
- * Copyright (C) 2009-2012 Typesafe Inc. <http://www.typesafe.com>
- */
-
-package docs.pattern
-
-import org.scalatest.junit.JUnitSuite
-
-class SchedulerPatternTest extends SchedulerPatternTestBase with JUnitSuite

akka-docs/rst/java/howto.rst

@@ -29,9 +29,12 @@ message sends to the same actor.
 
 .. note::
 
-   With this approach the scheduler will be restarted with the actor on restarts.
+   With this approach the scheduled periodic message send will be restarted with the actor on restarts.
+   This also means that the time period that elapses between two tick messages during a restart may drift
+   off based on when you restart the scheduled message sends relative to the time that the last message was
+   sent, and how long the initial delay is. Worst case scenario is ``interval`` plus ``initialDelay``.
 
-.. includecode:: code/docs/pattern/SchedulerPatternTestBase.java#schedule-constructor
+.. includecode:: code/docs/pattern/SchedulerPatternTest.java#schedule-constructor
 
 The second variant sets up an initial one shot message send in the ``preStart`` method
 of the actor, and the then the actor when it receives this message sets up a new one shot
@@ -43,7 +46,7 @@ and schedule the initial message send again.
    With this approach we won't fill up the mailbox with tick messages if the actor is
    under pressure, but only schedule a new tick message when we have seen the previous one.
 
-.. includecode:: code/docs/pattern/SchedulerPatternTestBase.java#schedule-receive
+.. includecode:: code/docs/pattern/SchedulerPatternTest.java#schedule-receive
 
 Template Pattern
 ================

akka-docs/rst/scala/code/docs/pattern/SchedulerPatternSpec.scala

@@ -15,10 +15,10 @@ import docs.pattern.SchedulerPatternSpec.ScheduleInConstructor
 object SchedulerPatternSpec {
   //#schedule-constructor
   class ScheduleInConstructor extends Actor {
-    import context._
+    val tick =
-
+      context.system.scheduler.schedule(500 millis, 1000 millis, self, "tick")
-    val tick = system.scheduler.schedule(500 millis, 1000 millis, self, "tick")
     //#schedule-constructor
+    // this var and constructor is declared here to not show up in the docs
     var target: ActorRef = null
     def this(target: ActorRef) = { this(); this.target = target }
     //#schedule-constructor
@@ -41,6 +41,7 @@ object SchedulerPatternSpec {
   class ScheduleInReceive extends Actor {
     import context._
     //#schedule-receive
+    // this var and constructor is declared here to not show up in the docs
     var target: ActorRef = null
     def this(target: ActorRef) = { this(); this.target = target }
     //#schedule-receive

akka-docs/rst/scala/howto.rst

@@ -123,7 +123,10 @@ message sends to the same actor.
 
 .. note::
 
-   With this approach the scheduler will be restarted with the actor on restarts.
+   With this approach the scheduled periodic message send will be restarted with the actor on restarts.
+   This also means that the time period that elapses between two tick messages during a restart may drift
+   off based on when you restart the scheduled message sends relative to the time that the last message was
+   sent, and how long the initial delay is. Worst case scenario is ``interval`` plus ``initialDelay``.
 
 .. includecode:: code/docs/pattern/SchedulerPatternSpec.scala#schedule-constructor