Created
May 7, 2015 06:20
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A simple trait to work with bson/json events in akka's persistence
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| import play.api.libs.json._ | |
| import play.modules.reactivemongo.json.ImplicitBSONHandlers._ | |
| import reactivemongo.bson.BSONDocument | |
| trait PersistentJson extends akka.persistence.PersistentActor { | |
| private[this] var classMap: Map[Manifest[_], Writes[_]] = Map.empty | |
| private[this] var namesMap: Map[String, Reads[_]] = Map.empty | |
| case class ClassFormat[T](cls: Class[T], format: Format[T]) | |
| def registerEvent[T: Format : Manifest](name: String): Unit = { | |
| registerEventFmt[T](name, implicitly[Format[T]]) | |
| } | |
| def registerEventFmt[T: Manifest](name: String, fmt: Format[T]): Unit = { | |
| classMap = classMap + (manifest[T] -> (__ \ name).write[T](fmt)) | |
| namesMap = namesMap + (name -> (__ \ name).read[T](fmt)) | |
| } | |
| def persistJson[T: Manifest](e: T)(f: T => Unit) = | |
| classMap.get(manifest[T]).map(_.asInstanceOf[Writes[T]].writes(e)).map(JsValueWriter.write) match { | |
| case Some(bson) => | |
| persist(bson)(_ => f(e)) | |
| case None => | |
| throw new IllegalArgumentException("Event is not registered for persistence: " + e) | |
| } | |
| def receiveRecoverJson: Receive | |
| def decodeBsonEvent: PartialFunction[Any, Any] = { | |
| case bson: BSONDocument => | |
| val json = JsObjectReader.read(bson) | |
| val key = json.value.keys.head | |
| namesMap(key).reads(json) match { | |
| case JsSuccess(v, _) => v | |
| case e: JsError => | |
| throw new IllegalArgumentException("Cannot read json: " + json) | |
| } | |
| case o => | |
| play.api.Logger.warn("non-bson event: "+o) | |
| o | |
| } | |
| override def receiveRecover: Receive = decodeBsonEvent andThen receiveRecoverJson.orElse { | |
| case m => play.api.Logger.warn(s"${self.path} Unhandled recovery event: "+m) | |
| } | |
| } |
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