Question

我有一个使用akka的应用程序，现在我想通过套接字连接来连接它。因此，我使用类似于the one from the scala page的机制。但是，如果我尝试tell，当我打开OutputStream时，目标不会收到任何消息。

这是我的源代码：

object Connector {

  def main(args: Array[String]) {
    val port = 1337
    val conf = ConfigFactory.load
    val system = ActorSystem("SDDB", conf.getConfig("SDDB"))
    val master = system.actorOf(Props[TestActor])
    master ! "a"

    try {
      val listener = new ServerSocket(port)
      println("listening on port: " + port)
      while (true)
        new ConnectionThread(listener accept, master).start
      listener close
    } catch {
      case e: IOException =>
        System.err.println("Could not listen on port: " + port + ".")
        System.exit(-1)
    } finally {
      system.shutdown
    }
  }
}

case class ConnectionThread(socket: Socket, master: ActorRef) 
  extends Thread("ConnectionThread") {

  private val Select_* = """select (\w+) from (\w+) on (\d{4})-(\d\d)-(\d\d)""".r
  private implicit var id = 0L
  private implicit val timeout = Timeout(25.0 seconds)

  master ! "b"

  override def run {
    master ! "c"
    try{
      master ! "d"
      val in = new ObjectInputStream(socket getInputStream)
      master ! "e"
      val out = new ObjectOutputStream(socket getOutputStream)

      out writeObject("listening")
      out flush

      master ! "f"
      val command = in.readObject.asInstanceOf[String]
      println("client sent: '" + command + "'")
      // process the command

      master ! "g"
      out.writeObject("EOF")
      out.flush

      out.close
      in.close
      socket.close
    } catch {
      case e: SocketException =>
      case e: IOException => e printStackTrace
    }
  }
}

class TestActor extends Actor with ActorLogging{

  log info("TestActor running")

  def receive = {
    case s: String =>
      log info("received: " + s)
  }

}

我得到了输出：

listening on port: 1337
[INFO] TestActor running
[INFO] received: a
[INFO] received: b
[INFO] received: c
[INFO] received: d

现在我预计它会持续到g，但我会得到：

client sent: 'select content from testdata on 2012-07-06'

我发现它一直工作，直到我打开套接字的流，可能是因为tell和ask也是socketbased并使用套接字的输出流，胎面运行。然后套接字连接有效，但我无法将任何消息发送到actor-system。
我无法删除Connector和ConnectionThread。我该如何解决？

Answer 1

我必须承认，我没有完全理解文档中的示例。但我发现使用ConnectionHelper而不是直接寻址ActorRef非常有效。
我将代码更改为以下内容：

object Connector {

  def main(args: Array[String]) {
    val port = 1337
    val conf = ConfigFactory.load
    val system = ActorSystem("SDDB", conf.getConfig("SDDB"))

    //    val master = system.actorOf(Props[TestActor], "master")
    //    master ! "a"

    try {
      val listener = new ServerSocket(port)
      println("listening on port: " + port)
      while (true)
      //        new ConnectionThread(listener accept, master.asInstanceOf[TestActor]).start
        new ConnectionThread(listener accept, system).start
      listener close
    } catch {
      case e: IOException =>
        System.err.println("Could not listen on port: " + port + ".")
        System.exit(-1)
    } finally {
      //      master ! PoisonPill
      system.shutdown
    }
  }

}

case class ConnectionThread(socket: Socket, sys: ActorSystem) 
  extends Thread("ConnectionThread") {

  private val Select_* = """select (\w+) from (\w+) on (\d{4})-(\d\d)-(\d\d)""".r
  private implicit var id = 0L
  private implicit val timeout = Timeout(25.0 seconds)
  private val conHelper = new ConnectionHelper

  override def run {
    try {
      val out = new ObjectOutputStream(socket getOutputStream)
      val in = new ObjectInputStream(socket getInputStream)

      conHelper tell "funzt"
      out writeObject ("Hi")
      out.flush
      val command = in.readObject.asInstanceOf[String]
      println("received: " + command)
      out writeObject ("test")
      out.flush
      out writeObject ("EOF")
      out.flush

      out.close
      in.close
      socket.close
    }
  }

  private class ConnectionHelper {
    val tester = sys.actorOf(Props[TestActor])

    def tell(s: String) { tester ! s }

  }

}

我真的不明白为什么会这样，而我的问题中的代码却没有。我欢迎所有的解释。

套接字连接和ActorSystem

1 个答案: