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package akka.serial
package stream
import akka.stream.scaladsl.Source
import scala.concurrent.Future
import akka.actor.{Extension, ActorSystem, ExtendedActorSystem, ExtensionId, ExtensionIdProvider}
import akka.io.IO
import akka.stream.scaladsl.Flow
import akka.util.ByteString
import akka.serial.{Serial => CoreSerial}
import impl._
object Serial extends ExtensionId[Serial] with ExtensionIdProvider {
/**
* Represents a prospective serial connection.
*/
case class Connection(port: String, settings: SerialSettings)
case class Watch(ports: Set[String])
def apply()(implicit system: ActorSystem): Serial = super.apply(system)
override def lookup() = Serial
override def createExtension(system: ExtendedActorSystem): Serial = new Serial(system)
}
/**
* Entry point to streaming over serial ports.
* The design of this API is inspired by Akka's Tcp streams.
*/
class Serial(system: ExtendedActorSystem) extends Extension {
/**
* Creates a Flow that will open a serial port when materialized.
* This Flow then represents an open serial connection: data pushed to its
* inlet will be written to the underlying serial port, and data received
* on the port will be emitted by its outlet.
* @param port name of serial port to open
* @param settings settings to use with serial port
* @param failOnOverflow when set, the returned Flow will fail when incoming data is dropped
* @param bufferSize maximum read and write buffer sizes
* @return a Flow associated to the given serial port
*/
def open(port: String, settings: SerialSettings, failOnOverflow: Boolean = false, bufferSize: Int = 1024):
Flow[ByteString, ByteString, Future[Serial.Connection]] = Flow.fromGraph(
new SerialConnectionStage(
IO(CoreSerial)(system),
port,
settings,
failOnOverflow,
bufferSize
)
)
def watch(ports: Set[String]): Source[String, Future[Serial.Watch]] = Source.fromGraph(
new WatcherStage(
IO(CoreSerial)(system),
ports
)
)
}
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