initial commit on serialization docs

akka-remote/src/main/scala/akka/serialization/ProtobufSerializer.scala

@@ -0,0 +1,26 @@
+/**
+ * Copyright (C) 2009-2011 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package akka.serialization
+
+import akka.serialization.Serializer
+import com.google.protobuf.Message
+
+class ProtobufSerializer extends Serializer {
+  val ARRAY_OF_BYTE_ARRAY = Array[Class[_]](classOf[Array[Byte]])
+
+  def identifier = 2: Byte
+
+  def toBinary(obj: AnyRef): Array[Byte] = {
+    if (!obj.isInstanceOf[Message]) throw new IllegalArgumentException(
+      "Can't serialize a non-protobuf message using protobuf [" + obj + "]")
+    obj.asInstanceOf[Message].toByteArray
+  }
+
+  def fromBinary(bytes: Array[Byte], clazz: Option[Class[_]], classLoader: Option[ClassLoader] = None): AnyRef = {
+    if (!clazz.isDefined) throw new IllegalArgumentException(
+      "Need a protobuf message class to be able to serialize bytes using protobuf")
+    clazz.get.getDeclaredMethod("parseFrom", ARRAY_OF_BYTE_ARRAY: _*).invoke(null, bytes).asInstanceOf[Message]
+  }
+}