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package com.github.jodersky.flow
import java.io.IOException
import com.github.jodersky.flow.internal.InternalSerial
import Serial._
import akka.actor.Actor
import akka.actor.ActorLogging
import akka.actor.ActorRef
import akka.actor.Terminated
import akka.actor.actorRef2Scala
import akka.util.ByteString
import scala.collection.mutable.HashSet
import akka.actor.Props
/**
* Operator associated to an open serial port. All communication with a port is done via an operator. Operators are created though the serial manager.
* @see SerialManager
*/
class SerialOperator(serial: InternalSerial) extends Actor with ActorLogging {
import SerialOperator._
import context._
private val receivers = new HashSet[ActorRef]
private val receiversLock = new Object
private def tellAllReceivers(msg: Any) = receiversLock.synchronized {
receivers.foreach { receiver =>
receiver ! msg
}
}
private object Reader extends Thread {
def readLoop() = {
var continueReading = true
while (continueReading) {
try {
val data = ByteString(serial.read())
tellAllReceivers(Received(data))
} catch {
//port is closing, stop thread gracefully
case ex: PortInterruptedException => {
continueReading = false
}
//something else went wrong stop and tell actor
case ex: Exception => {
continueReading = false
self ! ReadException(ex)
}
}
}
}
def name = this.getName()
override def run() {
this.setName("flow-reader " + serial.port)
readLoop()
}
}
override def preStart() = {
Reader.start()
}
override def postStop = {
serial.close()
}
def receive: Receive = {
case Register(actor) => receiversLock.synchronized {
receivers += actor
}
case Unregister(actor) => receiversLock.synchronized {
receivers -= actor
}
case Write(data, ack) => {
val sent = serial.write(data.toArray)
if (ack != NoAck) sender ! ack
}
case Close => {
tellAllReceivers(Closed)
context stop self
}
//go down with reader thread
case ReadException(ex) => throw ex
}
}
object SerialOperator {
private case class ReadException(ex: Exception)
def apply(serial: InternalSerial) = Props(classOf[SerialOperator], serial)
}
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