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36 package gr.grnet.aquarium
40 import akka.actor.Actor
41 import com.ckkloverdos.maybe.{Failed, NoVal, Just, Maybe}
42 import util.{Loggable, shortNameOfClass}
45 * An actor who dispatches to particular methods based on the type of the received message.
47 * @author Christos KK Loverdos <loverdos@gmail.com>.
49 trait ReflectiveAquariumActor extends Actor with Loggable {
50 private val messageMethodMap: Map[Class[_ <: AnyRef], java.lang.reflect.Method] = {
51 val classMethodPairs = for(knownMessageType <- knownMessageTypes) yield {
52 require(knownMessageType ne null, "Null in knownMessageTypes of %s".format(this.getClass))
53 val methodName = "on%s".format(shortNameOfClass(knownMessageType))
54 // For each class MethodClass we expect a method with the following signature:
55 // def onMethodClass(message: MethodClass): Unit
56 Maybe(this.getClass.getMethod(methodName, knownMessageType)) match {
58 method.setAccessible(true)
59 (knownMessageType, method)
61 throw new Exception("Reflective actor %s does not know how to process message %s".format(this.getClass, knownMessageType))
63 throw new Exception("Reflective actor %s does not know how to process message %s".format(this.getClass, knownMessageType), e)
67 Map(classMethodPairs: _*)
70 def knownMessageTypes: List[Class[_ <: AnyRef]]
72 protected def receive: Receive = {
75 case message: AnyRef =>
76 messageMethodMap.get(message.getClass) match {
77 case Some(reflectiveMethod) =>
78 reflectiveMethod.invoke(this, message)
80 receiveUnknown(message)
84 receiveUnknown(message)
87 def receiveNull: Unit = {}
89 def receiveUnknown(message: Any): Unit = {
90 logger.warn("Received unknown message: %s".format(message))