(Prefer) non symbolic typed ask 26306

.travis.yml

@@ -30,7 +30,7 @@ cache:
 script:
   - jabba use "adopt@~1.8.202-08"
   # need to override as the default is to test
-  - sbt -jvm-opts .jvmopts-travis ++$TRAVIS_SCALA_VERSION update mimaReportBinaryIssues test:compile
+  - sbt -jvm-opts .jvmopts-travis ";++$TRAVIS_SCALA_VERSION update ;++$TRAVIS_SCALA_VERSION mimaReportBinaryIssues ;++$TRAVIS_SCALA_VERSION test:compile"
   # make 'git branch' work again
   - git branch -f "$TRAVIS_BRANCH" && git checkout "$TRAVIS_BRANCH"
   # check policies, if on master also upload

akka-actor-testkit-typed/src/main/scala/akka/actor/testkit/typed/scaladsl/ActorTestKit.scala

@@ -159,7 +159,7 @@ final class ActorTestKit private[akka] (val name: String, val config: Config, se
    * guardian
    */
   def spawn[T](behavior: Behavior[T], props: Props): ActorRef[T] =
-    Await.result(internalSystem ? (ActorTestKitGuardian.SpawnActorAnonymous(behavior, _, props)), timeout.duration)
+    Await.result(internalSystem.ask(ActorTestKitGuardian.SpawnActorAnonymous(behavior, _, props)), timeout.duration)
 
   /**
    * Spawn the given behavior. This is created as a child of the test kit
@@ -173,7 +173,7 @@ final class ActorTestKit private[akka] (val name: String, val config: Config, se
    * guardian
    */
   def spawn[T](behavior: Behavior[T], name: String, props: Props): ActorRef[T] =
-    Await.result(internalSystem ? (ActorTestKitGuardian.SpawnActor(name, behavior, _, props)), timeout.duration)
+    Await.result(internalSystem.ask(ActorTestKitGuardian.SpawnActor(name, behavior, _, props)), timeout.duration)
 
   /**
    * Stop the actor under test and wait until it terminates.
@@ -181,7 +181,7 @@ final class ActorTestKit private[akka] (val name: String, val config: Config, se
    * Other actors will not be stopped by this method.
    */
   def stop[T](ref: ActorRef[T], max: FiniteDuration = timeout.duration): Unit = try {
-    Await.result(internalSystem ? { x: ActorRef[ActorTestKitGuardian.Ack.type] ⇒ ActorTestKitGuardian.StopActor(ref, x) }, max)
+    Await.result(internalSystem.ask { x: ActorRef[ActorTestKitGuardian.Ack.type] ⇒ ActorTestKitGuardian.StopActor(ref, x) }, max)
   } catch {
     case _: TimeoutException ⇒
       assert(false, s"timeout ($max) during stop() waiting for actor [${ref.path}] to stop")

akka-actor-testkit-typed/src/test/scala/docs/akka/actor/testkit/typed/scaladsl/AsyncTestingExampleSpec.scala

@@ -43,7 +43,7 @@ object AsyncTestingExampleSpec {
     }
 
     private def publish(i: Int)(implicit timeout: Timeout): Future[Try[Int]] = {
-      publisher ? (ref ⇒ Message(i, ref))
+      publisher.ask(ref ⇒ Message(i, ref))
     }
 
   }

akka-actor-typed-tests/src/test/scala/akka/actor/typed/AskSpec.scala

@@ -18,9 +18,11 @@ import scala.util.Success
 import akka.actor.testkit.typed.scaladsl.ScalaTestWithActorTestKit
 import org.scalatest.WordSpecLike
 
+import scala.concurrent.Future
+
 object AskSpec {
   sealed trait Msg
-  final case class Foo(s: String)(val replyTo: ActorRef[String]) extends Msg
+  final case class Foo(s: String, replyTo: ActorRef[String]) extends Msg
   final case class Stop(replyTo: ActorRef[Unit]) extends Msg
 }
 
@@ -51,12 +53,14 @@ class AskSpec extends ScalaTestWithActorTestKit("""
   "Ask pattern" must {
     "fail the future if the actor is already terminated" in {
       val ref = spawn(behavior)
-      (ref ? Stop).futureValue
+      val stopResult: Future[Unit] = ref.ask(Stop)
+      stopResult.futureValue
+
       val probe = createTestProbe()
       probe.expectTerminated(ref, probe.remainingOrDefault)
-      val answer =
+      val answer: Future[String] =
         EventFilter.warning(pattern = ".*received dead letter.*", occurrences = 1).intercept {
-          ref ? Foo("bar")
+          ref.ask(Foo("bar", _))
         }
       val result = answer.failed.futureValue
       result shouldBe a[TimeoutException]
@@ -65,7 +69,13 @@ class AskSpec extends ScalaTestWithActorTestKit("""
 
     "succeed when the actor is alive" in {
       val ref = spawn(behavior)
-      val response = ref ? Foo("bar")
+      val response: Future[String] = ref.ask(Foo("bar", _))
+      response.futureValue should ===("foo")
+    }
+
+    "provide a symbolic alias that works the same" in {
+      val ref = spawn(behavior)
+      val response: Future[String] = ref ? (Foo("bar", _))
       response.futureValue should ===("foo")
     }
 
@@ -73,7 +83,7 @@ class AskSpec extends ScalaTestWithActorTestKit("""
       val actor = spawn(Behaviors.empty[Foo])
       implicit val timeout: Timeout = 10.millis
       EventFilter.warning(pattern = ".*unhandled message.*", occurrences = 1).intercept {
-        val answer = actor ? Foo("bar")
+        val answer: Future[String] = actor.ask(Foo("bar", _))
         val result = answer.failed.futureValue
         result shouldBe a[TimeoutException]
         result.getMessage should startWith("Ask timed out on")
@@ -90,9 +100,9 @@ class AskSpec extends ScalaTestWithActorTestKit("""
           fail("this test must only run in an adapted actor system")
       }
 
-      val answer =
+      val answer: Future[String] =
         EventFilter.warning(pattern = ".*received dead letter.*", occurrences = 1).intercept {
-          noSuchActor ? Foo("bar")
+          noSuchActor.ask(Foo("bar", _))
         }
       val result = answer.failed.futureValue
       result shouldBe a[TimeoutException]
@@ -120,7 +130,7 @@ class AskSpec extends ScalaTestWithActorTestKit("""
         implicit val timeout: Timeout = 3.seconds
         implicit val scheduler = untypedSystem.toTyped.scheduler
         val typedLegacy: ActorRef[AnyRef] = legacyActor
-        (typedLegacy ? Ping).failed.futureValue should ===(ex)
+        (typedLegacy.ask(Ping)).failed.futureValue should ===(ex)
       } finally {
         akka.testkit.TestKit.shutdownActorSystem(untypedSystem)
       }

akka-actor-typed-tests/src/test/scala/akka/actor/typed/SpawnProtocolSpec.scala

@@ -46,7 +46,7 @@ class SpawnProtocolSpec extends ScalaTestWithActorTestKit with WordSpecLike {
       val parent = spawn(SpawnProtocol.behavior, "parent2")
       import akka.actor.typed.scaladsl.AskPattern._
       implicit val timeout = Timeout(5.seconds)
-      val parentReply = parent ? SpawnProtocol.Spawn(target, "child", Props.empty)
+      val parentReply = parent.ask(SpawnProtocol.Spawn(target, "child", Props.empty))
       val child = parentReply.futureValue
       val childReply = TestProbe[Pong.type]()
       child ! Ping(childReply.ref)

akka-actor-typed-tests/src/test/scala/akka/actor/typed/internal/receptionist/LocalReceptionistSpec.scala

@@ -110,7 +110,7 @@ class LocalReceptionistSpec extends ScalaTestWithActorTestKit with WordSpecLike
     "work with ask" in {
       val receptionist = spawn(LocalReceptionist.behavior)
       val serviceA = spawn(behaviorA)
-      val f: Future[Registered] = receptionist ? (Register(ServiceKeyA, serviceA, _))
+      val f: Future[Registered] = receptionist.ask(Register(ServiceKeyA, serviceA, _))
       f.futureValue should be(Registered(ServiceKeyA, serviceA))
     }
 

akka-actor-typed-tests/src/test/scala/akka/actor/typed/receptionist/ReceptionistApiSpec.scala

@@ -31,7 +31,7 @@ object ReceptionistApiSpec {
     // needs the explicit type on the future and the extra parenthesises
     // to work
     val registered: Future[Receptionist.Registered] =
-      system.receptionist ? (Receptionist.Register(key, service, _))
+      system.receptionist.ask(Receptionist.Register(key, service, _))
     registered.foreach {
       case key.Registered(ref) ⇒
         // ref is the right type here
@@ -41,7 +41,7 @@ object ReceptionistApiSpec {
 
     // one-off ask outside of actor, should be uncommon but not rare
     val found: Future[Receptionist.Listing] =
-      system.receptionist ? (Receptionist.Find(key, _))
+      system.receptionist.ask(Receptionist.Find(key, _))
     found.foreach {
       case key.Listing(instances) ⇒
         instances.foreach(_ ! "woho")

akka-actor-typed-tests/src/test/scala/docs/akka/typed/DispatchersDocSpec.scala

@@ -63,15 +63,15 @@ class DispatchersDocSpec extends ScalaTestWithActorTestKit(DispatchersDocSpec.co
       val probe = TestProbe[Dispatcher]()
       val actor: ActorRef[SpawnProtocol] = spawn(SpawnProtocol.behavior)
 
-      val withDefault = (actor ? Spawn(giveMeYourDispatcher, "default", Props.empty)).futureValue
+      val withDefault = actor.ask(Spawn(giveMeYourDispatcher, "default", Props.empty)).futureValue
       withDefault ! WhichDispatcher(probe.ref)
       probe.receiveMessage().id shouldEqual "akka.actor.default-dispatcher"
 
-      val withBlocking = (actor ? Spawn(giveMeYourDispatcher, "default", DispatcherSelector.blocking())).futureValue
+      val withBlocking = actor.ask(Spawn(giveMeYourDispatcher, "default", DispatcherSelector.blocking())).futureValue
       withBlocking ! WhichDispatcher(probe.ref)
       probe.receiveMessage().id shouldEqual "akka.actor.default-blocking-io-dispatcher"
 
-      val withCustom = (actor ? Spawn(giveMeYourDispatcher, "default", DispatcherSelector.fromConfig("your-dispatcher"))).futureValue
+      val withCustom = actor.ask(Spawn(giveMeYourDispatcher, "default", DispatcherSelector.fromConfig("your-dispatcher"))).futureValue
       withCustom ! WhichDispatcher(probe.ref)
       probe.receiveMessage().id shouldEqual "your-dispatcher"
     }

akka-actor-typed-tests/src/test/scala/docs/akka/typed/InteractionPatternsSpec.scala

@@ -368,7 +368,7 @@ class InteractionPatternsSpec extends ScalaTestWithActorTestKit with WordSpecLik
     implicit val timeout: Timeout = 3.seconds
     implicit val scheduler = system.scheduler
 
-    val result: Future[Cookies] = cookieActorRef ? (ref ⇒ GiveMeCookies(ref))
+    val result: Future[Cookies] = cookieActorRef.ask(ref ⇒ GiveMeCookies(ref))
 
     // the response callback will be executed on this execution context
     implicit val ec = system.executionContext

akka-actor-typed-tests/src/test/scala/docs/akka/typed/SpawnProtocolDocSpec.scala

@@ -61,7 +61,7 @@ class SpawnProtocolDocSpec extends ScalaTestWithActorTestKit with WordSpecLike {
       implicit val scheduler: Scheduler = system.scheduler
 
       val greeter: Future[ActorRef[HelloWorld.Greet]] =
-        system ? SpawnProtocol.Spawn(behavior = HelloWorld.greeter, name = "greeter", props = Props.empty)
+        system.ask(SpawnProtocol.Spawn(behavior = HelloWorld.greeter, name = "greeter", props = Props.empty))
 
       val greetedBehavior = Behaviors.receive[HelloWorld.Greeted] { (context, message) ⇒
         context.log.info("Greeting for {} from {}", message.whom, message.from)
@@ -69,7 +69,7 @@ class SpawnProtocolDocSpec extends ScalaTestWithActorTestKit with WordSpecLike {
       }
 
       val greetedReplyTo: Future[ActorRef[HelloWorld.Greeted]] =
-        system ? SpawnProtocol.Spawn(greetedBehavior, name = "", props = Props.empty)
+        system.ask(SpawnProtocol.Spawn(greetedBehavior, name = "", props = Props.empty))
 
       for (greeterRef ← greeter; replyToRef ← greetedReplyTo) {
         greeterRef ! HelloWorld.Greet("Akka", replyToRef)

akka-actor-typed/src/main/scala/akka/actor/typed/internal/ActorContextImpl.scala

@@ -83,7 +83,7 @@ import akka.util.JavaDurationConverters._
   // Scala API impl
   override def ask[Req, Res](target: RecipientRef[Req])(createRequest: ActorRef[Res] ⇒ Req)(mapResponse: Try[Res] ⇒ T)(implicit responseTimeout: Timeout, classTag: ClassTag[Res]): Unit = {
     import akka.actor.typed.scaladsl.AskPattern._
-    pipeToSelf((target ? createRequest)(responseTimeout, system.scheduler))(mapResponse)
+    pipeToSelf((target.ask(createRequest))(responseTimeout, system.scheduler))(mapResponse)
   }
 
   // Java API impl

akka-actor-typed/src/main/scala/akka/actor/typed/javadsl/AskPattern.scala

@@ -31,5 +31,5 @@ import scala.compat.java8.FutureConverters._
  */
 object AskPattern {
   def ask[T, U](actor: RecipientRef[T], message: JFunction[ActorRef[U], T], timeout: Duration, scheduler: Scheduler): CompletionStage[U] =
-    (actor.?(message.apply)(timeout.asScala, scheduler)).toJava
+    (actor.ask(message.apply)(timeout.asScala, scheduler)).toJava
 }

akka-actor-typed/src/main/scala/akka/actor/typed/scaladsl/AskPattern.scala

@@ -19,19 +19,20 @@ import akka.actor.typed.internal.InternalRecipientRef
 
 /**
  * The ask-pattern implements the initiator side of a request–reply protocol.
- * The `?` operator is pronounced as "ask".
  *
- * See [[AskPattern.Askable.?]] for details
+ * See [[AskPattern.Askable.ask]] for details
  */
 object AskPattern {
 
   /**
-   * See [[?]]
+   * See [[ask]]
    */
   implicit final class Askable[T](val ref: RecipientRef[T]) extends AnyVal {
     /**
      * The ask-pattern implements the initiator side of a request–reply protocol.
-     * The `?` operator is pronounced as "ask".
+     * The `?` operator is pronounced as "ask" (and a convenience symbolic operation
+     * kept since the previous ask API, if unsure which one to use, prefer the non-symbolic
+     * method as it leads to fewer surprises with the scope of the `replyTo` function)
      *
      * Note that if you are inside of an actor you should prefer [[ActorContext.ask]]
      * as that provides better safety.
@@ -51,10 +52,45 @@ object AskPattern {
      * implicit val scheduler = system.scheduler
      * implicit val timeout = Timeout(3.seconds)
      * val target: ActorRef[Request] = ...
-     * val f: Future[Reply] = target ? replyTo => (Request("hello", replyTo))
+     * val f: Future[Reply] = target ? (replyTo => (Request("hello", replyTo)))
      * }}}
+     *
+     * Note: it is preferrable to use the non-symbolic ask method as it easier allows for wildcards for
+     * the `ActorRef`.
      */
     def ?[U](replyTo: ActorRef[U] ⇒ T)(implicit timeout: Timeout, @unused scheduler: Scheduler): Future[U] = {
+      ask(replyTo)(timeout, scheduler)
+    }
+
+    /**
+     * The ask-pattern implements the initiator side of a request–reply protocol.
+     *
+     * Note that if you are inside of an actor you should prefer [[ActorContext.ask]]
+     * as that provides better safety.
+     *
+     * The party that asks may be within or without an Actor, since the
+     * implementation will fabricate a (hidden) [[ActorRef]] that is bound to a
+     * [[scala.concurrent.Promise]]. This ActorRef will need to be injected in the
+     * message that is sent to the target Actor in order to function as a reply-to
+     * address, therefore the argument to the ask / `?`
+     * operator is not the message itself but a function that given the reply-to
+     * address will create the message.
+     *
+     * {{{
+     * case class Request(msg: String, replyTo: ActorRef[Reply])
+     * case class Reply(msg: String)
+     *
+     * implicit val scheduler = system.scheduler
+     * implicit val timeout = Timeout(3.seconds)
+     * val target: ActorRef[Request] = ...
+     * val f: Future[Reply] = target.ask(replyTo => (Request("hello", replyTo)))
+     * // alternatively
+     * val f2: Future[Reply] = target.ask(Request("hello", _))
+     * // note that the explicit type on f2 is important for the compiler
+     * // to understand the type of the wildcard
+     * }}}
+     */
+    def ask[U](replyTo: ActorRef[U] ⇒ T)(implicit timeout: Timeout, @unused scheduler: Scheduler): Future[U] = {
       // We do not currently use the implicit scheduler, but want to require it
       // because it might be needed when we move to a 'native' typed runtime, see #24219
       ref match {

akka-bench-jmh-typed/README.md

@@ -0,0 +1,10 @@
+# Akka Microbenchmarks
+
+This subproject contains some microbenchmarks excercising key parts of Akka Typed.
+
+You can run them like:
+
+   project akka-bench-jmh-typed
+   jmh:run -i 3 -wi 3 -f 1 .*ActorCreationBenchmark
+
+Use 'jmh:run -h' to get an overview of the available options.

akka-bench-jmh-typed/src/main/scala/akka/BenchRunner.scala

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2018-2019 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+package akka
+
+import org.openjdk.jmh.results.RunResult
+import org.openjdk.jmh.runner.Runner
+import org.openjdk.jmh.runner.options.CommandLineOptions
+
+object BenchRunner {
+  def main(args: Array[String]) = {
+    import scala.collection.JavaConverters._
+
+    val args2 = args.toList.flatMap {
+      case "quick"    ⇒ "-i 1 -wi 1 -f1 -t1".split(" ").toList
+      case "full"     ⇒ "-i 10 -wi 4 -f3 -t1".split(" ").toList
+      case "jitwatch" ⇒ "-jvmArgs=-XX:+UnlockDiagnosticVMOptions -XX:+TraceClassLoading -XX:+LogCompilation" :: Nil
+      case other      ⇒ other :: Nil
+    }
+
+    val opts = new CommandLineOptions(args2: _*)
+    val results = new Runner(opts).run()
+
+    val report = results.asScala.map { result: RunResult ⇒
+      val bench = result.getParams.getBenchmark
+      val params = result.getParams.getParamsKeys.asScala.map(key ⇒ s"$key=${result.getParams.getParam(key)}").mkString("_")
+      val score = result.getAggregatedResult.getPrimaryResult.getScore.round
+      val unit = result.getAggregatedResult.getPrimaryResult.getScoreUnit
+      s"\t${bench}_${params}\t$score\t$unit"
+    }
+
+    report.toList.sorted.foreach(println)
+  }
+}

akka-bench-jmh-typed/src/main/scala/akka/actor/typed/TypedActorBenchmark.scala

@@ -99,7 +99,7 @@ class TypedActorBenchmark {
   @Benchmark
   @OperationsPerInvocation(totalMessages)
   def echo(): Unit = {
-    Await.result(system ? Start, timeout)
+    Await.result(system.ask(Start), timeout)
   }
 
 }

akka-bench-jmh/README.md

@@ -1,6 +1,8 @@
 # Akka Microbenchmarks
 
-This subproject contains some microbenchmarks excercising key parts of Akka.
+This subproject contains some microbenchmarks excercising key parts of Akka. (Excluding typed which has its 
+own jmh module)
+
 
 You can run them like:
 

akka-cluster-typed/src/test/scala/akka/cluster/ddata/typed/scaladsl/ReplicatorSpec.scala

@@ -106,14 +106,14 @@ object ReplicatorSpec {
       implicit val scheduler: Scheduler = ???
       implicit val cluster: Cluster = ???
 
-      val reply1: Future[GetResponse[GCounter]] = replicator ? Replicator.Get(Key, Replicator.ReadLocal)
+      val reply1: Future[GetResponse[GCounter]] = replicator.ask(Replicator.Get(Key, Replicator.ReadLocal))
 
       val reply2: Future[UpdateResponse[GCounter]] =
-        replicator ? Replicator.Update(Key, GCounter.empty, Replicator.WriteLocal)(_ + 1)
+        replicator.ask(Replicator.Update(Key, GCounter.empty, Replicator.WriteLocal)(_ + 1))
 
-      val reply3: Future[DeleteResponse[GCounter]] = replicator ? Replicator.Delete(Key, Replicator.WriteLocal)
+      val reply3: Future[DeleteResponse[GCounter]] = replicator.ask(Replicator.Delete(Key, Replicator.WriteLocal))
 
-      val reply4: Future[ReplicaCount] = replicator ? Replicator.GetReplicaCount()
+      val reply4: Future[ReplicaCount] = replicator.ask(Replicator.GetReplicaCount())
 
       // suppress unused compiler warnings
       println("" + reply1 + reply2 + reply3 + reply4)

akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/PersistentActorCompileOnlyTest.scala

@@ -6,13 +6,14 @@ package akka.persistence.typed.scaladsl
 
 import scala.concurrent.ExecutionContext
 import scala.concurrent.duration._
-
 import akka.actor.typed.{ ActorRef, Behavior }
 import akka.actor.typed.scaladsl.Behaviors
 import akka.actor.typed.scaladsl.TimerScheduler
 import akka.persistence.typed.PersistenceId
 import akka.persistence.typed.SideEffect
 
+import scala.concurrent.Future
+
 object PersistentActorCompileOnlyTest {
 
   import akka.persistence.typed.scaladsl.EventSourcedBehavior._
@@ -57,7 +58,7 @@ object PersistentActorCompileOnlyTest {
 
     case class EventsInFlight(nextCorrelationId: Int, dataByCorrelationId: Map[Int, String])
 
-    case class Request(correlationId: Int, data: String)(sender: ActorRef[Response])
+    case class Request(correlationId: Int, data: String, sender: ActorRef[Response])
     case class Response(correlationId: Int)
     val sideEffectProcessor: ActorRef[Request] = ???
 
@@ -67,8 +68,10 @@ object PersistentActorCompileOnlyTest {
       implicit val scheduler: akka.actor.Scheduler = ???
       implicit val ec: ExecutionContext = ???
 
-      (sideEffectProcessor ? Request(correlationId, data))
-        .map(response ⇒ AcknowledgeSideEffect(response.correlationId))
+      val response: Future[RecoveryComplete.Response] =
+        sideEffectProcessor.ask(Request(correlationId, data, _))
+
+      response.map(response ⇒ AcknowledgeSideEffect(response.correlationId))
         .foreach(sender ! _)
     }
 

build.sbt

@@ -21,7 +21,7 @@ initialize := {
   initialize.value
 }
 
-akka.AkkaBuild.buildSettings
+// akka.AkkaBuild.buildSettings
 shellPrompt := { s => Project.extract(s).currentProject.id + " > " }
 resolverSettings
 
@@ -46,6 +46,7 @@ lazy val aggregatedProjects: Seq[ProjectReference] = Seq(
   actorTyped, actorTypedTests, actorTestkitTyped,
   persistenceTyped,
   clusterTyped, clusterShardingTyped,
+  benchJmhTyped,
   streamTyped,
   discovery
 )
@@ -58,8 +59,9 @@ lazy val root = Project(
  .settings(unidocRootIgnoreProjects :=
    (CrossVersion.partialVersion(scalaVersion.value) match {
      case Some((2, n)) if n == 11 ⇒ aggregatedProjects // ignore all, don't unidoc when scalaVersion is 2.11
-     case _                       ⇒ Seq(remoteTests, benchJmh, protobuf, akkaScalaNightly, docs)
-   })
+     case _                       ⇒ Seq(remoteTests, benchJmh, benchJmhTyped, protobuf, akkaScalaNightly, docs)
+   }),
+   crossScalaVersions := Nil, // Allows some modules (typed) to be only for 2.12 sbt/sbt#3465
  )
  .settings(
    unmanagedSources in(Compile, headerCreate) := (baseDirectory.value / "project").**("*.scala").get
@@ -102,8 +104,7 @@ lazy val benchJmh = akkaModule("akka-bench-jmh")
     Seq(
       actor,
       stream, streamTests,
-      persistence, persistenceTyped,
-      distributedData, clusterTyped,
+      persistence, distributedData,
       testkit
     ).map(_ % "compile->compile;compile->test"): _*
   )
@@ -111,6 +112,21 @@ lazy val benchJmh = akkaModule("akka-bench-jmh")
   .enablePlugins(JmhPlugin, ScaladocNoVerificationOfDiagrams, NoPublish, CopyrightHeader)
   .disablePlugins(MimaPlugin, WhiteSourcePlugin, ValidatePullRequest, CopyrightHeaderInPr)
 
+// typed benchmarks only on 2.12+
+lazy val benchJmhTyped = akkaModule("akka-bench-jmh-typed")
+  .dependsOn(
+    Seq(
+      persistenceTyped,
+      distributedData, clusterTyped,
+      testkit, benchJmh
+    ).map(_ % "compile->compile;compile->test"): _*
+  )
+  .settings(Dependencies.benchJmh)
+  .settings(AkkaBuild.noScala211)
+  .enablePlugins(JmhPlugin, ScaladocNoVerificationOfDiagrams, NoPublish, CopyrightHeader)
+  .disablePlugins(MimaPlugin, WhiteSourcePlugin, ValidatePullRequest, CopyrightHeaderInPr)
+
+
 lazy val camel = akkaModule("akka-camel")
   .dependsOn(actor, slf4j, testkit % "test->test")
   .settings(Dependencies.camel)
@@ -247,6 +263,7 @@ lazy val docs = akkaModule("akka-docs")
     resolvers += Resolver.jcenterRepo,
     deployRsyncArtifact := List((paradox in Compile).value -> s"www/docs/akka/${version.value}")
   )
+  .settings(AkkaBuild.noScala211)
   .enablePlugins(
     AkkaParadoxPlugin, DeployRsync, NoPublish, ParadoxBrowse,
     ScaladocNoVerificationOfDiagrams,
@@ -395,6 +412,7 @@ lazy val actorTyped = akkaModule("akka-actor-typed")
   .settings(AkkaBuild.mayChangeSettings)
   .settings(AutomaticModuleName.settings("akka.actor.typed")) // fine for now, eventually new module name to become typed.actor
   .settings(OSGi.actorTyped)
+  .settings(AkkaBuild.noScala211)
   .settings(
     initialCommands := """
       import akka.actor.typed._
@@ -417,6 +435,7 @@ lazy val persistenceTyped = akkaModule("akka-persistence-typed")
   )
   .settings(Dependencies.persistenceShared)
   .settings(AkkaBuild.mayChangeSettings)
+  .settings(AkkaBuild.noScala211)
   .settings(AutomaticModuleName.settings("akka.persistence.typed"))
   .settings(OSGi.persistenceTyped)
   .disablePlugins(MimaPlugin)
@@ -435,6 +454,7 @@ lazy val clusterTyped = akkaModule("akka-cluster-typed")
     remoteTests % "test->test"
   )
   .settings(AkkaBuild.mayChangeSettings)
+  .settings(AkkaBuild.noScala211)
   .settings(AutomaticModuleName.settings("akka.cluster.typed"))
   .disablePlugins(MimaPlugin)
   .configs(MultiJvm)
@@ -451,6 +471,7 @@ lazy val clusterShardingTyped = akkaModule("akka-cluster-sharding-typed")
     remoteTests % "test->test"
   )
   .settings(AkkaBuild.mayChangeSettings)
+  .settings(AkkaBuild.noScala211)
   .settings(AutomaticModuleName.settings("akka.cluster.sharding.typed"))
   // To be able to import ContainerFormats.proto
   .settings(Protobuf.importPath := Some(baseDirectory.value / ".." / "akka-remote" / "src" / "main" / "protobuf" ))
@@ -467,6 +488,7 @@ lazy val streamTyped = akkaModule("akka-stream-typed")
     actorTypedTests % "test->test"
   )
   .settings(AkkaBuild.mayChangeSettings)
+  .settings(AkkaBuild.noScala211)
   .settings(AutomaticModuleName.settings("akka.stream.typed"))
   .disablePlugins(MimaPlugin)
   .enablePlugins(ScaladocNoVerificationOfDiagrams)
@@ -475,6 +497,7 @@ lazy val actorTestkitTyped = akkaModule("akka-actor-testkit-typed")
   .dependsOn(actorTyped, testkit % "compile->compile;test->test")
   .settings(AutomaticModuleName.settings("akka.actor.testkit.typed"))
   .settings(Dependencies.actorTestkitTyped)
+  .settings(AkkaBuild.noScala211)
   .disablePlugins(MimaPlugin)
 
 lazy val actorTypedTests = akkaModule("akka-actor-typed-tests")
@@ -483,6 +506,7 @@ lazy val actorTypedTests = akkaModule("akka-actor-typed-tests")
     actorTestkitTyped % "compile->compile;test->test"
   )
   .settings(AkkaBuild.mayChangeSettings)
+  .settings(AkkaBuild.noScala211)
   .disablePlugins(MimaPlugin)
   .enablePlugins(NoPublish)
 

project/AkkaBuild.scala

@@ -233,6 +233,11 @@ object AkkaBuild {
     javacOptions in test ++= Seq("-Xdoclint:none"),
     javacOptions in doc ++= Seq("-Xdoclint:none", "--ignore-source-errors"))
 
+
+  lazy val noScala211 = Seq(
+    crossScalaVersions := crossScalaVersions.value.filterNot(_.startsWith("2.11"))
+  )
+
   def loadSystemProperties(fileName: String): Unit = {
     import scala.collection.JavaConverters._
     val file = new File(fileName)