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

/**
 * Copyright (C) 2009-2011 Typesafe Inc. <http://www.typesafe.com>
 */

package akka.serialization

import com.google.protobuf.Message

/**
 * This Serializer serializes `com.google.protobuf.Message`s
 */
class ProtobufSerializer extends Serializer {
  val ARRAY_OF_BYTE_ARRAY = Array[Class[_]](classOf[Array[Byte]])
  def includeManifest: Boolean = true
  def identifier = 2: Serializer.Identifier

  def toBinary(obj: AnyRef): Array[Byte] = obj match {
    case m: Message ⇒ m.toByteArray
    case _          ⇒ throw new IllegalArgumentException("Can't serialize a non-protobuf message using protobuf [" + obj + "]")
  }

  def fromBinary(bytes: Array[Byte], clazz: Option[Class[_]], classLoader: Option[ClassLoader] = None): AnyRef =
    clazz match {
      case None    ⇒ throw new IllegalArgumentException("Need a protobuf message class to be able to serialize bytes using protobuf")
      case Some(c) ⇒ c.getDeclaredMethod("parseFrom", ARRAY_OF_BYTE_ARRAY: _*).invoke(null, bytes).asInstanceOf[Message]
    }
}