Re-enable akka-kernel and add small sample

Created a new simple version of the microkernel for inclusion in the akka download and to be able to start working on sample applications
2011-12-14 16:19:16 +13:00 · 2011-12-14 16:19:16 +13:00 · ba9ed982ca
commit ba9ed982ca
parent 66e7155ef1
19 changed files with 247 additions and 531 deletions
--- a/akka-kernel/src/main/scala/akka/kernel/Main.scala
+++ b/akka-kernel/src/main/scala/akka/kernel/Main.scala
@ -0,0 +1,143 @@
+/**
+ * Copyright (C) 2009-2010 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package akka.kernel
+
+import akka.actor.ActorSystem
+import com.typesafe.config.ConfigFactory
+import java.io.File
+import java.lang.Boolean.getBoolean
+import java.net.{ URL, URLClassLoader }
+import java.util.jar.JarFile
+import scala.collection.JavaConverters._
+
+trait Bootable {
+  def startup(system: ActorSystem): Unit
+  def shutdown(system: ActorSystem): Unit
+}
+
+object Main {
+  val quiet = getBoolean("akka.kernel.quiet")
+
+  def log(s: String) = if (!quiet) println(s)
+
+  def main(args: Array[String]) = {
+    log(banner)
+    log("Starting Akka...")
+    log("Running Akka " + ActorSystem.Version)
+
+    val config = ConfigFactory.load("akka.conf")
+    val name = config.getString("akka.kernel.system.name")
+    val system = ActorSystem(name, config)
+    val classLoader = deployJars(system)
+
+    log("Created actor system '%s'" format name)
+
+    Thread.currentThread.setContextClassLoader(classLoader)
+
+    val bootClasses: Seq[String] = system.settings.config.getStringList("akka.kernel.boot").asScala
+    val bootables: Seq[Bootable] = bootClasses map { c ⇒ classLoader.loadClass(c).newInstance.asInstanceOf[Bootable] }
+
+    for (bootable ← bootables) {
+      log("Starting up " + bootable.getClass.getName)
+      bootable.startup(system)
+    }
+
+    addShutdownHook(system, bootables)
+
+    log("Successfully started Akka")
+  }
+
+  def deployJars(system: ActorSystem): ClassLoader = {
+    if (system.settings.Home.isEmpty) {
+      log("Akka home is not defined")
+      System.exit(1)
+      Thread.currentThread.getContextClassLoader
+    } else {
+      val home = system.settings.Home.get
+      val deploy = new File(home, "deploy")
+
+      if (!deploy.exists) {
+        log("No deploy dir found at " + deploy)
+        log("Please check that akka home is defined correctly")
+        System.exit(1)
+      }
+
+      val jars = deploy.listFiles.filter(_.getName.endsWith(".jar"))
+
+      val nestedJars = jars flatMap { jar ⇒
+        val jarFile = new JarFile(jar)
+        val jarEntries = jarFile.entries.asScala.toArray.filter(_.getName.endsWith(".jar"))
+        jarEntries map { entry ⇒ new File("jar:file:%s!/%s" format (jarFile.getName, entry.getName)) }
+      }
+
+      val urls = (jars ++ nestedJars) map { _.toURI.toURL }
+
+      urls foreach { url ⇒ log("Deploying " + url) }
+
+      new URLClassLoader(urls, Thread.currentThread.getContextClassLoader)
+    }
+  }
+
+  def addShutdownHook(system: ActorSystem, bootables: Seq[Bootable]): Unit = {
+    Runtime.getRuntime.addShutdownHook(new Thread(new Runnable {
+      def run = {
+        log("")
+        log("Received signal to stop")
+        log("Shutting down Akka...")
+        for (bootable ← bootables) {
+          log("Shutting down " + bootable.getClass.getName)
+          bootable.shutdown(system)
+        }
+        system.stop()
+        log("Successfully shut down Akka")
+      }
+    }))
+  }
+
+  def banner = """
+==============================================================================
+
+                                                   ZZ:
+                                                  ZZZZ
+                                                 ZZZZZZ
+                                                ZZZ' ZZZ
+                                       ~7      7ZZ'   ZZZ
+                                      :ZZZ:   IZZ'     ZZZ
+                                     ,OZZZZ.~ZZ?        ZZZ
+                                    ZZZZ' 'ZZZ$          ZZZ
+                           .       $ZZZ   ~ZZ$            ZZZ
+                         .=Z?.   .ZZZO   ~ZZ7              OZZ
+                        .ZZZZ7..:ZZZ~   7ZZZ                ZZZ~
+                      .$ZZZ$Z+.ZZZZ    ZZZ:                  ZZZ$
+                   .,ZZZZ?'  =ZZO=   .OZZ                     'ZZZ
+                 .$ZZZZ+   .ZZZZ    IZZZ                        ZZZ$
+               .ZZZZZ'   .ZZZZ'   .ZZZ$                          ?ZZZ
+            .ZZZZZZ'   .OZZZ?    ?ZZZ                             'ZZZ$
+        .?ZZZZZZ'    .ZZZZ?    .ZZZ?                                'ZZZO
+    .+ZZZZZZ?'    .7ZZZZ'    .ZZZZ                                    :ZZZZ
+ .ZZZZZZ$'     .?ZZZZZ'   .~ZZZZ                                        'ZZZZ.
+
+
+                      NNNNN              $NNNN+
+                      NNNNN              $NNNN+
+                      NNNNN              $NNNN+
+                      NNNNN              $NNNN+
+                      NNNNN              $NNNN+
+    =NNNNNNNNND$      NNNNN     DDDDDD:  $NNNN+     DDDDDN     NDDNNNNNNNN,
+   NNNNNNNNNNNNND     NNNNN    DNNNNN    $NNNN+   8NNNNN=    :NNNNNNNNNNNNNN
+  NNNNN$    DNNNNN    NNNNN  $NNNNN~     $NNNN+  NNNNNN      NNNNN,   :NNNNN+
+   ?DN~      NNNNN    NNNNN MNNNNN       $NNNN+:NNNNN7        $ND      =NNNNN
+            DNNNNN    NNNNNDNNNN$        $NNNNDNNNNN                  :DNNNNN
+     ZNDNNNNNNNNND    NNNNNNNNNND,       $NNNNNNNNNNN           DNDNNNNNNNNNN
+   NNNNNNNDDINNNNN    NNNNNNNNNNND       $NNNNNNNNNNND       ONNNNNNND8+NNNNN
+ :NNNND      NNNNN    NNNNNN  DNNNN,     $NNNNNO 7NNNND     NNNNNO     :NNNNN
+ DNNNN       NNNNN    NNNNN    DNNNN     $NNNN+   8NNNNN    NNNNN      $NNNNN
+ DNNNNO     NNNNNN    NNNNN     NNNNN    $NNNN+    NNNNN$   NNNND,    ,NNNNND
+  NNNNNNDDNNNNNNNN    NNNNN     =NNNNN   $NNNN+     DNNNN?  DNNNNNNDNNNNNNNND
+   NNNNNNNNN  NNNN$   NNNNN      8NNNND  $NNNN+      NNNNN=  ,DNNNNNNND NNNNN$
+
+==============================================================================
+"""
+}