Merge pull request #17120 from akka/wip-15677-deprecate-microkernel-patriknw

=ker #15677 Deprecate Microkernel

akka-docs/rst/intro/deployment-scenarios.rst

@@ -12,21 +12,50 @@ Akka can be used in different ways:
 - As a library: used as a regular JAR on the classpath and/or in a web app, to
   be put into ``WEB-INF/lib``
 
-- As a stand alone application by instantiating ActorSystem in a main class or
+- Package with `sbt-native-packager <https://github.com/sbt/sbt-native-packager>`_
-  using the :ref:`Microkernel (Scala) <microkernel-scala>` / :ref:`Microkernel (Java) <microkernel-java>`
+
+- Package and deploy using `Typesafe ConductR <http://typesafe.com/products/conductr>`_.
 
 
-Using Akka as library
+Native Packager
----------------------
+===============
 
-This is most likely what you want if you are building Web applications. There
+`sbt-native-packager <https://github.com/sbt/sbt-native-packager>`_ is a tool for creating
-are several ways you can use Akka in Library mode by adding more and more
+distributions of any type of application, including an Akka applications.
-modules to the stack.
+
+Define sbt version in ``project/build.properties`` file: 
+
+.. code-block:: none
+
+    sbt.version=0.13.7
+
+Add `sbt-native-packager <https://github.com/sbt/sbt-native-packager>`_ in ``project/plugins.sbt`` file:
+
+.. code-block:: none
+
+   addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.0.0-RC1")
+
+Use the package settings and optionally specify the mainClass in ``build.sbt`` file:
+
+.. includecode:: ../../../akka-samples/akka-sample-main-scala/build.sbt
 
 
-Using Akka as a stand alone microkernel
+.. note:: Use the ``JavaServerAppPackaging``. Don't use ``AkkaAppPackaging`` (previously named 
-----------------------------------------
+   ``packageArchetype.akka_application``, since it doesn't have the same flexibility and quality
+   as the ``JavaServerAppPackaging``.
+
+Use sbt task ``dist`` package the application.
+
+To start the application (on a unix-based system):
+
+.. code-block:: none
+
+   cd target/universal/
+   unzip akka-sample-main-scala-2.4-SNAPSHOT.zip
+   chmod u+x akka-sample-main-scala-2.4-SNAPSHOT/bin/akka-sample-main-scala
+   akka-sample-main-scala-2.4-SNAPSHOT/bin/akka-sample-main-scala sample.hello.Main
+
+Use ``Ctrl-C`` to interrupt and exit the application.
+
+On a Windows machine you can also use the ``bin\akka-sample-main-scala.bat`` script.
 
-Akka can also be run as a stand-alone microkernel. See
-:ref:`Microkernel (Scala) <microkernel-scala>` / :ref:`Microkernel (Java) <microkernel-java>` for
-more information.

akka-docs/rst/intro/getting-started.rst

@@ -17,9 +17,8 @@ Download
 --------
 
 There are several ways to download Akka. You can download it as part of the Typesafe Platform
-(as described above). You can download the full distribution with microkernel, which includes
+(as described above). You can download the full distribution, which includes all modules. 
-all modules. Or you can use a build tool like Maven or SBT to download dependencies from the
+Or you can use a build tool like Maven or SBT to download dependencies from the Akka Maven repository.
-Akka Maven repository.
 
 Modules
 -------
@@ -34,9 +33,6 @@ Akka is very modular and consists of several JARs containing different features.
 
 - ``akka-cluster`` – Cluster membership management, elastic routers.
 
-- ``akka-kernel`` – Akka microkernel for running a bare-bones mini application
-  server
-
 - ``akka-osgi`` – base bundle for using Akka in OSGi containers, containing the
   ``akka-actor`` classes
 
@@ -82,16 +78,6 @@ which includes proxies for several other repositories that Akka modules depend o
 
   The use of Akka SNAPSHOTs, nightlies and milestone releases is discouraged unless you know what you are doing.
 
-Microkernel
------------
-
-The Akka distribution includes the microkernel. To run the microkernel put your
-application jar in the ``deploy`` directory and use the scripts in the ``bin``
-directory.
-
-More information is available in the documentation of the
-:ref:`Microkernel (Scala) <microkernel-scala>` / :ref:`Microkernel (Java) <microkernel-java>`.
-
 .. _build-tool:
 
 Using a build tool

akka-docs/rst/intro/what-is-akka.rst

@@ -75,12 +75,14 @@ Akka has both a :ref:`scala-api` and a :ref:`java-api`.
 Akka can be used in two different ways
 ======================================
 
-- As a library: used by a web app, to be put into ``WEB-INF/lib`` or as a regular
+Akka can be used and deployed in different ways:
-  JAR on your classpath.
 
-- As a microkernel: stand-alone kernel to drop your application into.
+- As a library: used as a regular JAR on the classpath and/or in a web app, to
+  be put into ``WEB-INF/lib``
 
-See the :ref:`deployment-scenarios` for details.
+- Package with `sbt-native-packager <https://github.com/sbt/sbt-native-packager>`_
+
+- Package and deploy using `Typesafe ConductR <http://typesafe.com/products/conductr>`_.
 
 Commercial Support
 ==================

akka-docs/rst/intro/why-akka.rst

@@ -19,13 +19,11 @@ but also in the size of applications it is useful for. The core of Akka, akka-ac
 is very small and easily dropped into an existing project where you need
 asynchronicity and lockless concurrency without hassle.
 
-You can choose to include only the parts of akka you need in your application
+You can choose to include only the parts of akka you need in your application.
-and then there's the whole package, the Akka Microkernel, which is a standalone
+With CPUs growing more and more cores every cycle, Akka is the alternative that
-container to deploy your Akka application in. With CPUs growing more and more
+provides outstanding performance even if you're only running it on one machine.
-cores every cycle, Akka is the alternative that provides outstanding performance
+Akka also supplies a wide array of concurrency-paradigms, allowing users to choose
-even if you're only running it on one machine. Akka also supplies a wide array
+the right tool for the job.
-of concurrency-paradigms, allowing users to choose the right tool for the
-job.
 
 
 What's a good use-case for Akka?

akka-docs/rst/java/index-utilities.rst

@@ -10,4 +10,5 @@ Utilities
    ../common/duration
    ../common/circuitbreaker
    extending-akka
-   microkernel
+   ../intro/deployment-scenarios
+

akka-docs/rst/java/microkernel.rst

@@ -1,43 +0,0 @@
-
-.. _microkernel-java:
-
-Microkernel
-==================
-
-The purpose of the Akka Microkernel is to offer a bundling mechanism so that you can distribute
-an Akka application as a single payload, without the need to run in a Java Application Server or manually
-having to create a launcher script.
-
-The Akka Microkernel is included in the Akka download found at `downloads`_.
-
-.. _downloads: http://akka.io/downloads
-
-To run an application with the microkernel you need to create a Bootable class
-that handles the startup and shutdown the application. An example is included below.
-
-Put your application jar in the ``deploy`` directory and additional dependencies in the ``lib`` directory
-to have them automatically loaded and placed on the classpath.
-
-To start the kernel use the scripts in the ``bin`` directory, passing the boot
-classes for your application. 
-
-The start script adds ``config`` directory first in the classpath, followed by ``lib/*``.
-It runs java with main class ``akka.kernel.Main`` and the supplied Bootable class as
-argument.
-
-Example command (on a unix-based system):
-
-.. code-block:: none
-
-   bin/akka sample.kernel.hello.HelloKernel
-
-Use ``Ctrl-C`` to interrupt and exit the microkernel.
-
-On a Windows machine you can also use the bin/akka.bat script.
-
-The code for the Hello Kernel example (see the ``HelloKernel`` class for an example
-of creating a Bootable):
-
-.. includecode:: ../../../akka-samples/akka-sample-hello-kernel/src/main/java/sample/kernel/hello/java/HelloKernel.java
-
-

akka-docs/rst/project/migration-guide-2.3.x-2.4.x.rst

@@ -192,3 +192,13 @@ Router configuration entries have also changed for the module, they use prefix `
 ``cluster-metrics-adaptive-pool`` and ``cluster-metrics-adaptive-group``
 Metrics extension classes and objects are located in the new package ``akka.cluster.metrics``. 
 Please see :ref:`Scala <cluster-metrics-scala>`, :ref:`Java <cluster-metrics-java>` for more information.
+
+Microkernel is Deprecated
+=========================
+
+Akka Microkernel is deprecated and will be removed. It is replaced by using an ordinary
+user defined main class and packaging with `sbt-native-packager <https://github.com/sbt/sbt-native-packager>`_
+or `Typesafe ConductR <http://typesafe.com/products/conductr>`_.
+Please see :ref:`deployment-scenarios` for more information.
+
+

akka-docs/rst/scala/index-utilities.rst

@@ -10,4 +10,5 @@ Utilities
    ../common/duration
    ../common/circuitbreaker
    extending-akka
-   microkernel
+   ../intro/deployment-scenarios
+

akka-docs/rst/scala/microkernel.rst

@@ -1,47 +0,0 @@
-
-.. _microkernel-scala:
-
-Microkernel
-===================
-
-The purpose of the Akka Microkernel is to offer a bundling mechanism so that you can distribute
-an Akka application as a single payload, without the need to run in a Java Application Server or manually
-having to create a launcher script.
-
-The Akka Microkernel is included in the Akka download found at `downloads`_.
-
-.. _downloads: http://akka.io/downloads
-
-To run an application with the microkernel you need to create a Bootable class 
-that handles the startup and shutdown the application.
-
-The code for the Hello Kernel example (see the ``HelloKernel`` class for an example
-of creating a Bootable):
-
-.. includecode:: ../../../akka-samples/akka-sample-hello-kernel/src/main/scala/sample/kernel/hello/HelloKernel.scala
-
-
-Add `sbt-native-packager <https://github.com/sbt/sbt-native-packager>`_ to the plugins.sbt
-
-.. code-block:: none
-
-   addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "0.8.0-M2")
-
-Use the package settings for ``akka_application``, and specify the mainClass in build.sbt
-
-.. includecode:: ../../../akka-samples/akka-sample-hello-kernel/build.sbt
-
-
-Use sbt task ``stage`` to generate the start script. Also you can use task ``universal:packageZipTarball`` to package the application.
-
-To start the application (on a unix-based system):
-
-.. code-block:: none
-
-   ./target/universal/stage/bin/hello-kernel
-
-Use ``Ctrl-C`` to interrupt and exit the microkernel.
-
-On a Windows machine you can also use the ``target\universal\stage\bin\hello-kernel.bat`` script.
-
-

akka-kernel/src/main/scala/akka/kernel/Main.scala

@@ -42,6 +42,7 @@ import scala.collection.JavaConverters._
  * bin/akka org.app.BootApp
  * }}}
  */
+@deprecated("Microkernel is deprecated. Use ordinary main class instead", "2.4")
 trait Bootable {
   /**
    * Callback run on microkernel startup.
@@ -59,6 +60,7 @@ trait Bootable {
 /**
  * Main class for running the microkernel.
  */
+@deprecated("Microkernel is deprecated. Use ordinary main class instead.", "2.4")
 object Main {
   private val quiet = getBoolean("akka.kernel.quiet")
 
@@ -181,6 +183,7 @@ object Main {
   NNNNNNDDNNNNNNNN    NNNNN     =NNNNN   $NNNN+     DNNNN?  DNNNNNNDNNNNNNNND
    NNNNNNNNN  NNNN$   NNNNN      8NNNND  $NNNN+      NNNNN=  ,DNNNNNNND NNNNN$
 
+Microkernel is deprecated. Use ordinary main class instead.
 ==============================================================================
 """
 }

akka-samples/akka-sample-hello-kernel/COPYING

@@ -1,121 +0,0 @@
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akka-samples/akka-sample-hello-kernel/LICENSE

@@ -1,10 +0,0 @@
-Akka Sample by Typesafe
-
-Licensed under Public Domain (CC0)
-
-To the extent possible under law, the person who associated CC0 with
-this Akka Sample has waived all copyright and related or neighboring
-rights to this Akka Sample.
-
-You should have received a copy of the CC0 legalcode along with this
-work.  If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.

akka-samples/akka-sample-hello-kernel/README.md

@@ -1,13 +0,0 @@
-Hello World Sample
-==================
-
-This sample is meant to be used by studying the code; it does not perform any
-astounding functions when running it. If you want to run it, check out the akka
-sources on your local hard drive, follow the [instructions for setting up Akka
-with SBT](http://doc.akka.io/docs/akka/current/intro/getting-started.html).
-When you start SBT within the checked-out akka source directory, you can run
-this sample by typing
-
-    akka-sample-hello/run
-
-You can read more in the [Akka docs](http://akka.io/docs).

akka-samples/akka-sample-hello-kernel/build.sbt

@@ -1,16 +0,0 @@
-import NativePackagerKeys._
-
-packageArchetype.akka_application
-
-name := "hello-kernel"
-
-version := "2.4-SNAPSHOT"
-
-scalaVersion := "2.11.5"
-
-mainClass in Compile := Some("sample.kernel.hello.HelloKernel")
-
-libraryDependencies ++= Seq(
-  "com.typesafe.akka" %% "akka-kernel" % "2.4-SNAPSHOT",
-  "com.typesafe.akka" %% "akka-actor" % "2.4-SNAPSHOT"
-)

akka-samples/akka-sample-hello-kernel/project/build.properties

@@ -1 +0,0 @@
-sbt.version=0.13.7

akka-samples/akka-sample-hello-kernel/project/plugins.sbt

@@ -1 +0,0 @@
-addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "0.8.0-M2")

akka-samples/akka-sample-hello-kernel/src/main/java/sample/kernel/hello/java/HelloKernel.java

@@ -1,43 +0,0 @@
-package sample.kernel.hello.java;
-
-import akka.actor.ActorRef;
-import akka.actor.UntypedActor;
-import akka.actor.ActorSystem;
-import akka.actor.Props;
-import akka.kernel.Bootable;
-
-public class HelloKernel implements Bootable {
-  final ActorSystem system = ActorSystem.create("hellokernel");
-
-  public static class HelloActor extends UntypedActor {
-    final ActorRef worldActor = getContext().actorOf(
-        Props.create(WorldActor.class));
-
-    public void onReceive(Object message) {
-      if (message == "start")
-        worldActor.tell("Hello", getSelf());
-      else if (message instanceof String)
-        System.out.println(String.format("Received message '%s'", message));
-      else
-        unhandled(message);
-    }
-  }
-
-  public static class WorldActor extends UntypedActor {
-    public void onReceive(Object message) {
-      if (message instanceof String)
-        getSender().tell(((String) message).toUpperCase() + " world!",
-            getSelf());
-      else
-        unhandled(message);
-    }
-  }
-
-  public void startup() {
-    system.actorOf(Props.create(HelloActor.class)).tell("start", null);
-  }
-
-  public void shutdown() {
-    system.terminate();
-  }
-}

akka-samples/akka-sample-hello-kernel/src/main/scala/sample/kernel/hello/HelloKernel.scala

@@ -1,34 +0,0 @@
-package sample.kernel.hello
-
-import akka.actor.{ Actor, ActorSystem, Props }
-import akka.kernel.Bootable
-
-case object Start
-
-class HelloActor extends Actor {
-  val worldActor = context.actorOf(Props[WorldActor])
-
-  def receive = {
-    case Start => worldActor ! "Hello"
-    case message: String =>
-      println("Received message '%s'" format message)
-  }
-}
-
-class WorldActor extends Actor {
-  def receive = {
-    case message: String => sender() ! (message.toUpperCase + " world!")
-  }
-}
-
-class HelloKernel extends Bootable {
-  val system = ActorSystem("hellokernel")
-
-  def startup = {
-    system.actorOf(Props[HelloActor]) ! Start
-  }
-
-  def shutdown = {
-    system.terminate()
-  }
-}

akka-samples/akka-sample-main-scala/build.sbt

@@ -1,3 +1,5 @@
+import NativePackagerHelper._
+
 name := "akka-sample-main-scala"
 
 version := "2.4-SNAPSHOT"
@@ -7,3 +9,20 @@ scalaVersion := "2.11.5"
 libraryDependencies ++= Seq(
   "com.typesafe.akka" %% "akka-actor" % "2.4-SNAPSHOT"
 )
+
+enablePlugins(JavaServerAppPackaging)
+
+mainClass in Compile := Some("sample.hello.Main")
+
+mappings in Universal ++= {
+  // optional example illustrating how to copy additional directory
+  directory("scripts") ++
+  // copy configuration files to config directory
+  contentOf("src/main/resources").toMap.mapValues("config/" + _)
+}
+
+// add 'config' directory first in the classpath of the start script,
+// an alternative is to set the config file locations via CLI parameters
+// when starting the application
+scriptClasspath := Seq("../config/") ++ scriptClasspath.value
+

akka-samples/akka-sample-main-scala/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.0.0-RC1")

project/AkkaBuild.scala

@@ -189,7 +189,7 @@ object AkkaBuild extends Build {
     // FIXME osgiDiningHakkersSampleMavenTest temporarily removed from aggregate due to #16703
     aggregate = if (!CommandLineOptions.aggregateSamples) Nil else
       Seq(sampleCamelJava, sampleCamelScala, sampleClusterJava, sampleClusterScala, sampleFsmScala,
-        sampleHelloKernel, sampleMainJava, sampleMainScala, sampleMultiNodeScala,
+        sampleMainJava, sampleMainScala, sampleMultiNodeScala,
         samplePersistenceJava, samplePersistenceScala, sampleRemoteJava, sampleRemoteScala)
   )
 
@@ -201,8 +201,6 @@ object AkkaBuild extends Build {
 
   lazy val sampleFsmScala = Sample.project("akka-sample-fsm-scala")
 
-  lazy val sampleHelloKernel = Sample.project("akka-sample-hello-kernel")
-
   lazy val sampleMainJava = Sample.project("akka-sample-main-java")
   lazy val sampleMainScala = Sample.project("akka-sample-main-scala")
 

project/plugins.sbt

@@ -27,3 +27,5 @@ addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.1.6")
 
 // stats reporting
 libraryDependencies += "com.timgroup" % "java-statsd-client" % "2.0.0"
+
+addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.0.0-RC1")