concurrency - Synchronization using AKKA actors in scala -


i trying extend code in way inconsistency can occur , add functionality ensure consistency.

  1. allow localactor a1 read data remoteactor
  2. at localactor a1 perform modification
  3. send modification remoteactor (the update valid if there no change @ remoteactor)

  4. other localactor a2 can modify tree @ remoteactor possible inconsistency how should ensure when localactor have part of resource remoteactor (cxta of tree) should remain unchanged or locked no 1 else can modify it. how should approach problem?

    remoteactor code:

    class remoteactor extends actor {      def receive = {     case sendcontexta1() =>  this.synchronized{         println("from remote actor sender:"+sender+" tree part:"+remoteactor.rtree.cxta)                 sender ! rcvdcxta1(remoteactor.rtree.cxta)         }      case rcvdcxta1(cxta) => {         println("1. recievecontexta1 before :" + remoteactor.rtree.cxta)         remoteactor.rtree.cxta = cxta          println("1. recievecontexta1 before :" + remoteactor.rtree.cxta)     }      case _ => println("unknown msg")   } }    object remoteactor{              var rtree = rcxt(createrndcxta(1),createrndcxtb(2),1,"")      def main(args: array[string]) {               val system = actorsystem("remotesystem" , config)         val remoteactor = system.actorof(props[remoteactor], name="remote")     }     }

    localactora code

    class localactora extends actor{        @throws[exception](classof[exception])    def receive = {        case tasksum(t1) =>             remoteactor ! tasksum(t1)      val currentsender =  sender()             case getcontexta1() =>             remoteactor ! sendcontexta1()                 case rcvdcxta1(cxta) =>             rcvdcxt = cxta             println("recieved remote actor:"+ cxta)      case taskla1(taska) =>                                   rcvdcxt = rcvdcxt ::: localactora.tree.cxta             println("1. after   rcvd part: "+ rcvdcxt)             thread.sleep(1500)             rcvdcxt.foreach(ctxa => taska.work(ctxa))                                remoteactor ! rcvdcxta1(rcvdcxt)      case taskla2(taska) =>               rcvdcxt = rcvdcxt ::: localactora.tree.cxta             println("2. after   rcvd part: "+ rcvdcxt)             // task of dummy sum             rcvdcxt.foreach(ctxa => taska.work(ctxa))    } }          object localactora {     var tree = rcxt(createrndcxta(2),createrndcxtb(2),1,"")     def main(args: array[string]) {      val localactora1 = system.actorof(props[localactora], name="locala1")     val localactora2 = system.actorof(props[localactora], name="locala2")     localactora1 ! start     localactora2 ! start     localactora1 ! getcontexta1()     thread.sleep(500)     localactora1 ! taskla1(new dummysum())             localactora2 ! getcontexta1()     thread.sleep(500)     localactora2 ! taskla2(new dummysum())     } }


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