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package com.github.jodersky.flow
import java.io.IOException
import com.github.jodersky.flow.internal.InternalSerial
import Serial.Close
import Serial.Closed
import Serial.Opened
import Serial.Received
import Serial.Write
import Serial.Wrote
import akka.actor.Actor
import akka.actor.ActorLogging
import akka.actor.ActorRef
import akka.actor.Terminated
import akka.actor.actorRef2Scala
import akka.util.ByteString
/** Operator associated to an open serial port. All communication with a port is done via an operator. Operators are created though the serial manager. */
class SerialOperator(handler: ActorRef, serial: InternalSerial) extends Actor with ActorLogging {
import SerialOperator._
import context._
private object Reader extends Thread {
def enterReadLoop() = {
var continueReading = true
while (continueReading) {
try {
val data = ByteString(serial.read())
handler ! 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)
enterReadLoop()
}
}
override def preStart() = {
context watch handler
handler ! Opened(serial.port, serial.baud, serial.characterSize, serial.twoStopBits, Parity(serial.parity))
Reader.start()
}
override def postStop = {
serial.close()
}
def receive: Receive = {
case Write(data, ack) => {
try {
val sent = serial.write(data.toArray)
if (ack) sender ! Wrote(ByteString(sent))
} catch {
case ex: IOException => {
handler ! Closed(Some(ex))
context stop self
}
}
}
case Close => {
handler ! Closed(None)
context stop self
}
case Terminated(`handler`) => context.stop(self)
//go down with reader thread
case ReadException(ex) => {
handler ! Closed(Some(ex))
context stop self
}
}
}
object SerialOperator {
private case class ReadException(ex: Exception)
}
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