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package vfd.uav
import scala.collection.mutable.ArrayBuffer
import akka.actor.Actor
import akka.actor.ActorRef
import akka.actor.Terminated
import akka.actor.actorRef2Scala
import akka.util.ByteString
/** Protocol definition. */
object Connection {
trait Event
trait Command
/** Received data from the uav (or any other systems on the link) */
case class Received(bstr: ByteString) extends Event
/** The connection closed or could not be opened */
case class Closed(message: String) extends Event
/** Register the sender to be notified on events */
case object Register extends Command
/** Send given bytes out to the uav (or any other systems on the link) */
case class Send(bstr: ByteString) extends Command
}
/** Common behavior of connection actors. */
trait Connection { myself: Actor =>
/** Current clients that should be notified on incoming messages. */
private val _clients = new ArrayBuffer[ActorRef]
def clients = _clients.toSeq
/** Adds a client to the client list and acquires a deathwatch. */
protected def register(client: ActorRef) = {
_clients += client
myself.context.watch(client)
}
/** Remove client and release deathwatch. */
protected def unregister(client: ActorRef) = {
_clients -= client
myself.context.unwatch(client)
}
/** Sends a message to all registered clients. */
protected def sendAll(msg: Any) = clients foreach (_ ! msg)
/**
* Common registration behavior. Manages the events `Register` and `Terminated` by
* registering and unregistering clients.
*/
protected def registration: Receive = {
case Connection.Register => register(sender)
case Terminated(client) if clients contains client => unregister(client)
}
}
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