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package mavigator.uav
import akka.actor.ActorLogging
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 {
/** Any messages received and transmitted by actors implementing this protocol. */
sealed trait Message
/** Messages emitted by actors implementing this protocol. */
trait Event extends Message
/** 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
/** Messages that can be received by actors implementing this protocol. */
trait Command extends Message
/** Register the sender to be notified on events */
case object Register extends Command
case class Unregister(client: ActorRef) 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 with ActorLogging =>
private val _clients = new ArrayBuffer[ActorRef]
/** Current clients that should be notified on incoming messages. */
def clients = _clients.toSeq
/** Adds a client to the client list and acquires a deathwatch. */
protected def register(client: ActorRef): Unit = {
_clients += client
myself.context.watch(client)
myself.log.info("Client registered {}", client)
}
/** Remove client and release deathwatch. */
protected def unregister(client: ActorRef): Unit = if (clients contains client) {
_clients -= client
myself.context.unwatch(client)
myself.log.info("Client unregistered {}", client)
}
/** Sends a message to all registered clients. */
protected def sendAll(msg: Any): Unit = clients foreach (_ ! msg)
/** Common registration behavior. Manages the messages `Register` and `Terminated` by
* registering and unregistering clients. */
protected def handleRegistration: Receive = {
case Connection.Register => register(sender)
case Terminated(client) => unregister(client)
case other => myself.log.warning("Unknown message: {}", other)
}
}
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