=per #3774 Persistence activator templates

akka-samples/akka-sample-persistence-scala/src/main/scala/sample/persistence/SnapshotExample.scala

@@ -0,0 +1,43 @@
+/**
+ * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package sample.persistence
+
+import akka.actor._
+import akka.persistence._
+
+object SnapshotExample extends App {
+  case class ExampleState(received: List[String] = Nil) {
+    def update(s: String) = copy(s :: received)
+    override def toString = received.reverse.toString
+  }
+
+  class ExampleProcessor extends Processor {
+    var state = ExampleState()
+
+    def receive = {
+      case Persistent(s, snr)                    => state = state.update(s"${s}-${snr}")
+      case SaveSnapshotSuccess(metadata)         => // ...
+      case SaveSnapshotFailure(metadata, reason) => // ...
+      case SnapshotOffer(_, s: ExampleState) =>
+        println("offered state = " + s)
+        state = s
+      case "print" => println("current state = " + state)
+      case "snap"  => saveSnapshot(state)
+    }
+  }
+
+  val system = ActorSystem("example")
+  val processor = system.actorOf(Props(classOf[ExampleProcessor]), "processor-3-scala")
+
+  processor ! Persistent("a")
+  processor ! Persistent("b")
+  processor ! "snap"
+  processor ! Persistent("c")
+  processor ! Persistent("d")
+  processor ! "print"
+
+  Thread.sleep(1000)
+  system.shutdown()
+}