4 Stimmen

Seltsames Verhalten: Scala-Aktoren 2.7.7 vs. 2.8-Snapshot

Ich bin ein 18 Jahre alter Auszubildender und entdecke gerade Scala, das mir sehr gut gefällt :-). Um mich mit den Scala-Actoren vertraut zu machen, habe ich eine kleine Simulation mit einigen Zahnrädern und einem Controller geschrieben. Die ActorApplication erzeugt N Zahnräder mit zufälliger Geschwindigkeit. Der Controller errechnet eine Synchronisationsgeschwindigkeit und startet die Getriebe-Aktoren. Die Zahnräder synchronisieren sich schrittweise (1+ oder 1-) auf diese vorgegebene Geschwindigkeit. Die Simulation ist beendet, wenn alle Zahnräder die Synchronisationsgeschwindigkeit erreicht haben. Ich habe die Simulation in scala 2.7.7 entwickelt - und sie funktioniert so, wie ich es erwartet habe (siehe Ausgabe unten). Als ich jedoch auf die aktuelle Version 2.8.0-SNAPSHOT umgestiegen bin, habe ich ein seltsames Verhalten festgestellt. Dies ist der Code:

/**
 * Created by IntelliJ IDEA.
 * User: pmei
 */
import actors.Actor
import actors.Actor._
import collection.mutable.ListBuffer
import java.util.Random

case class ReceivedSpeed(gear: Gear)
case class StartSync

case class SyncGear(controller: GearController, syncSpeed: Int)

object ActorApplication extends Application {
  private val random = new Random() //scala.util random won't be random :(

  println("[App] start with creating gears")
  val gearList = new ListBuffer[Gear]()
  for (i <- 0 until 100) {
    gearList += new Gear(i)
  }

  val gearController = new GearController(gearList)

  gearController.start()
  gearController ! StartSync()
}

/**
 * CONTROLLER
 */
class GearController(nGears: ListBuffer[Gear]) extends Actor {

  private var syncGears = new ListBuffer[Gear]
  private var syncSpeed = 0
  def act = {
    loop {
      react {
        case StartSync() => {
          println("[Controller] Send commands for syncing to gears!")
          var speeds = new ListBuffer[Int]
          nGears.foreach(e => speeds += e.speed)

          //Calc avg
          //var avgSpeed = speeds.foldLeft(0)(_ + _) / speeds.length
          //var avgSpeed = speeds.foldLeft(0) { (x, y) => x + y } / speeds.length
          syncSpeed = (0/:speeds)(_ + _) / speeds.length //Average over all gear speeds

          println("[Controller] calculated syncSpeed: "+syncSpeed)
          nGears.foreach{e =>
                         e.start()
                         e ! SyncGear(this, syncSpeed)
          }
          println("[Controller] started all gears")
        }
        case ReceivedSpeed(gear: Gear) => {
          println("[Controller] Syncspeed received by a gear ("+gear.gearId+")")
          //println("[Controller] mailboxsize: "+self.mailboxSize)
          syncGears += gear
          if(syncGears.length == nGears.length) {
            println("[Controller] all gears are back in town!")
            System.exit(0)
          }
        }
        case _ => println("[Controller] No match :(")
      }
    }
  }
}

/**
 * GEAR
 */
class Gear(id: Int) extends Actor {

  private val random = new Random() //scala.util random won't be random :(
  private var mySpeed = random.nextInt(1000)
  private var myController: GearController = null

  def speed = mySpeed
  def gearId = id

  println("[Gear ("+id+")] created with speed: "+mySpeed)

  def act = {
    loop {
      react {
        case SyncGear(controller: GearController, syncSpeed: Int) => {
          //println("[Gear ("+id+")] activated, try to follow controller command (form mySpeed ("+mySpeed+") to syncspeed ("+syncSpeed+")")
          myController = controller
          adjustSpeedTo(syncSpeed)
        }
      }
    }
  }

  def adjustSpeedTo(targetSpeed: Int) = {
    if(targetSpeed > mySpeed) {
      mySpeed += 1
      self ! SyncGear(myController, targetSpeed)
    }else if(targetSpeed < mySpeed) {
      mySpeed -= 1
      self ! SyncGear(myController, targetSpeed)
    } else if(targetSpeed == mySpeed) {
      callController
    }
  }

  def callController = {
    println("[Gear ("+id+")] has syncSpeed")
    myController ! ReceivedSpeed(this)
  }
}

Der obige Code erzeugt in Scala 2.7.7 eine Ausgabe wie:

[App] start with creating gears
[Gear (0)] created with speed: 935
[Gear (1)] created with speed: 398
[Gear (2)] created with speed: 164
[Gear (3)] created with speed: 64
[Gear (4)] created with speed: 461
[Gear (5)] created with speed: 741
[Gear (6)] created with speed: 93
[Gear (7)] created with speed: 850
[Gear (8)] created with speed: 679
[Gear (9)] created with speed: 587
[Gear (10)] created with speed: 789
[Gear (11)] created with speed: 849
[Gear (12)] created with speed: 386
[Gear (13)] created with speed: 981
[Gear (14)] created with speed: 246
[Gear (15)] created with speed: 661
[Gear (16)] created with speed: 245
[Gear (17)] created with speed: 655
[Gear (18)] created with speed: 193
[Gear (19)] created with speed: 240
[Gear (20)] created with speed: 72
[Gear (21)] created with speed: 884
[Gear (22)] created with speed: 334
[Gear (23)] created with speed: 169
[Gear (24)] created with speed: 665
[Gear (25)] created with speed: 773
[Gear (26)] created with speed: 333
[Gear (27)] created with speed: 524
[Gear (28)] created with speed: 673
[Gear (29)] created with speed: 189
[Gear (30)] created with speed: 573
[Gear (31)] created with speed: 762
[Gear (32)] created with speed: 162
[Gear (33)] created with speed: 735
[Gear (34)] created with speed: 222
[Gear (35)] created with speed: 854
[Gear (36)] created with speed: 124
[Gear (37)] created with speed: 650
[Gear (38)] created with speed: 514
[Gear (39)] created with speed: 0
[Gear (40)] created with speed: 106
[Gear (41)] created with speed: 117
[Gear (42)] created with speed: 912
[Gear (43)] created with speed: 782
[Gear (44)] created with speed: 161
[Gear (45)] created with speed: 748
[Gear (46)] created with speed: 311
[Gear (47)] created with speed: 168
[Gear (48)] created with speed: 776
[Gear (49)] created with speed: 424
[Gear (50)] created with speed: 749
[Gear (51)] created with speed: 819
[Gear (52)] created with speed: 664
[Gear (53)] created with speed: 996
[Gear (54)] created with speed: 877
[Gear (55)] created with speed: 808
[Gear (56)] created with speed: 781
[Gear (57)] created with speed: 464
[Gear (58)] created with speed: 408
[Gear (59)] created with speed: 337
[Gear (60)] created with speed: 822
[Gear (61)] created with speed: 812
[Gear (62)] created with speed: 979
[Gear (63)] created with speed: 290
[Gear (64)] created with speed: 972
[Gear (65)] created with speed: 20
[Gear (66)] created with speed: 787
[Gear (67)] created with speed: 680
[Gear (68)] created with speed: 466
[Gear (69)] created with speed: 554
[Gear (70)] created with speed: 53
[Gear (71)] created with speed: 212
[Gear (72)] created with speed: 90
[Gear (73)] created with speed: 535
[Gear (74)] created with speed: 268
[Gear (75)] created with speed: 893
[Gear (76)] created with speed: 847
[Gear (77)] created with speed: 671
[Gear (78)] created with speed: 106
[Gear (79)] created with speed: 779
[Gear (80)] created with speed: 433
[Gear (81)] created with speed: 757
[Gear (82)] created with speed: 400
[Gear (83)] created with speed: 88
[Gear (84)] created with speed: 89
[Gear (85)] created with speed: 348
[Gear (86)] created with speed: 695
[Gear (87)] created with speed: 618
[Gear (88)] created with speed: 986
[Gear (89)] created with speed: 624
[Gear (90)] created with speed: 578
[Gear (91)] created with speed: 613
[Gear (92)] created with speed: 52
[Gear (93)] created with speed: 9
[Gear (94)] created with speed: 91
[Gear (95)] created with speed: 790
[Gear (96)] created with speed: 481
[Gear (97)] created with speed: 443
[Gear (98)] created with speed: 709
[Gear (99)] created with speed: 772
[Controller] Send commands for syncing to gears!
[Controller] calculated syncSpeed: 512
[Controller] started all gears
[Gear (38)] has syncSpeed
[Controller] Syncspeed received by a gear (38)
[Gear (27)] has syncSpeed
[Controller] Syncspeed received by a gear (27)
[Gear (73)] has syncSpeed
[Controller] Syncspeed received by a gear (73)
[Gear (96)] has syncSpeed
[Controller] Syncspeed received by a gear (96)
[Gear (69)] has syncSpeed
[Controller] Syncspeed received by a gear (69)
[Gear (68)] has syncSpeed
[Controller] Syncspeed received by a gear (68)
[Gear (57)] has syncSpeed
[Controller] Syncspeed received by a gear (57)
[Gear (4)] has syncSpeed
[Controller] Syncspeed received by a gear (4)
[Gear (30)] has syncSpeed
[Controller] Syncspeed received by a gear (30)
[Gear (90)] has syncSpeed
[Controller] Syncspeed received by a gear (90)
[Gear (97)] has syncSpeed
[Controller] Syncspeed received by a gear (97)
[Gear (9)] has syncSpeed
[Controller] Syncspeed received by a gear (9)
[Gear (80)] has syncSpeed
[Controller] Syncspeed received by a gear (80)
[Gear (49)] has syncSpeed
[Controller] Syncspeed received by a gear (49)
[Gear (91)] has syncSpeed
[Controller] Syncspeed received by a gear (91)
[Gear (58)] has syncSpeed
[Controller] Syncspeed received by a gear (58)
[Gear (87)] has syncSpeed
[Controller] Syncspeed received by a gear (87)
[Gear (82)] has syncSpeed
[Gear (89)] has syncSpeed
[Controller] Syncspeed received by a gear (82)
[Controller] Syncspeed received by a gear (89)
[Gear (1)] has syncSpeed
[Controller] Syncspeed received by a gear (1)
[Gear (12)] has syncSpeed
[Controller] Syncspeed received by a gear (12)
[Gear (37)] has syncSpeed
[Controller] Syncspeed received by a gear (37)
[Gear (17)] has syncSpeed
[Controller] Syncspeed received by a gear (17)
[Gear (24)] has syncSpeed
[Controller] Syncspeed received by a gear (24)
[Gear (52)] has syncSpeed
[Controller] Syncspeed received by a gear (52)
[Gear (77)] has syncSpeed
[Controller] Syncspeed received by a gear (77)
[Gear (28)] has syncSpeed
[Controller] Syncspeed received by a gear (28)
[Gear (85)] has syncSpeed
[Controller] Syncspeed received by a gear (85)
[Gear (8)] has syncSpeed
[Controller] Syncspeed received by a gear (8)
[Gear (15)] has syncSpeed
[Gear (67)] has syncSpeed
[Controller] Syncspeed received by a gear (15)
[Controller] Syncspeed received by a gear (67)
[Gear (59)] has syncSpeed
[Controller] Syncspeed received by a gear (59)
[Gear (86)] has syncSpeed
[Controller] Syncspeed received by a gear (86)
[Gear (98)] has syncSpeed
[Controller] Syncspeed received by a gear (98)
[Gear (46)] has syncSpeed
[Controller] Syncspeed received by a gear (46)
[Gear (26)] has syncSpeed
[Controller] Syncspeed received by a gear (26)
[Gear (63)] has syncSpeed
[Gear (22)] has syncSpeed
[Controller] Syncspeed received by a gear (63)
[Gear (5)] has syncSpeed
[Controller] Syncspeed received by a gear (22)
[Controller] Syncspeed received by a gear (5)
[Gear (45)] has syncSpeed
[Controller] Syncspeed received by a gear (45)
[Gear (74)] has syncSpeed
[Gear (50)] has syncSpeed
[Controller] Syncspeed received by a gear (74)
[Gear (81)] has syncSpeed
[Controller] Syncspeed received by a gear (50)
[Controller] Syncspeed received by a gear (81)
[Gear (33)] has syncSpeed
[Controller] Syncspeed received by a gear (33)
[Gear (99)] has syncSpeed
[Controller] Syncspeed received by a gear (99)
[Gear (25)] has syncSpeed
[Controller] Syncspeed received by a gear (25)
[Gear (48)] has syncSpeed
[Controller] Syncspeed received by a gear (48)
[Gear (14)] has syncSpeed
[Controller] Syncspeed received by a gear (14)
[Gear (16)] has syncSpeed
[Gear (79)] has syncSpeed
[Controller] Syncspeed received by a gear (16)
[Controller] Syncspeed received by a gear (79)
[Gear (56)] has syncSpeed
[Controller] Syncspeed received by a gear (56)
[Gear (43)] has syncSpeed
[Controller] Syncspeed received by a gear (43)
[Gear (19)] has syncSpeed
[Controller] Syncspeed received by a gear (19)
[Gear (66)] has syncSpeed
[Gear (10)] has syncSpeed
[Controller] Syncspeed received by a gear (66)
[Controller] Syncspeed received by a gear (10)
[Gear (31)] has syncSpeed
[Controller] Syncspeed received by a gear (31)
[Gear (55)] has syncSpeed
[Gear (95)] has syncSpeed
[Controller] Syncspeed received by a gear (55)
[Controller] Syncspeed received by a gear (95)
[Gear (61)] has syncSpeed
[Controller] Syncspeed received by a gear (61)
[Gear (51)] has syncSpeed
[Controller] Syncspeed received by a gear (51)
[Gear (60)] has syncSpeed
[Controller] Syncspeed received by a gear (60)
[Gear (29)] has syncSpeed
[Controller] Syncspeed received by a gear (29)
[Gear (34)] has syncSpeed
[Controller] Syncspeed received by a gear (34)
[Gear (7)] has syncSpeed
[Controller] Syncspeed received by a gear (7)
[Gear (11)] has syncSpeed
[Controller] Syncspeed received by a gear (11)
[Gear (47)] has syncSpeed
[Controller] Syncspeed received by a gear (47)
[Gear (71)] has syncSpeed
[Controller] Syncspeed received by a gear (71)
[Gear (23)] has syncSpeed
[Controller] Syncspeed received by a gear (23)
[Gear (35)] has syncSpeed
[Gear (2)] has syncSpeed
[Controller] Syncspeed received by a gear (35)
[Controller] Syncspeed received by a gear (2)
[Gear (54)] has syncSpeed
[Controller] Syncspeed received by a gear (54)
[Gear (32)] has syncSpeed
[Controller] Syncspeed received by a gear (32)
[Gear (21)] has syncSpeed
[Controller] Syncspeed received by a gear (21)
[Gear (44)] has syncSpeed
[Controller] Syncspeed received by a gear (44)
[Gear (75)] has syncSpeed
[Controller] Syncspeed received by a gear (75)
[Gear (36)] has syncSpeed
[Controller] Syncspeed received by a gear (36)
[Gear (18)] has syncSpeed
[Gear (76)] has syncSpeed
[Controller] Syncspeed received by a gear (76)
[Controller] Syncspeed received by a gear (18)
[Gear (41)] has syncSpeed
[Controller] Syncspeed received by a gear (41)
[Gear (78)] has syncSpeed
[Gear (40)] has syncSpeed
[Controller] Syncspeed received by a gear (78)
[Controller] Syncspeed received by a gear (40)
[Gear (42)] has syncSpeed
[Gear (6)] has syncSpeed
[Controller] Syncspeed received by a gear (42)
[Controller] Syncspeed received by a gear (6)
[Gear (94)] has syncSpeed
[Controller] Syncspeed received by a gear (94)
[Gear (0)] has syncSpeed
[Gear (84)] has syncSpeed
[Controller] Syncspeed received by a gear (0)
[Gear (83)] has syncSpeed
[Controller] Syncspeed received by a gear (83)
[Gear (72)] has syncSpeed
[Controller] Syncspeed received by a gear (72)
[Gear (20)] has syncSpeed
[Controller] Syncspeed received by a gear (20)
[Gear (92)] has syncSpeed
[Controller] Syncspeed received by a gear (84)
[Controller] Syncspeed received by a gear (92)
[Gear (13)] has syncSpeed
[Gear (3)] has syncSpeed
[Controller] Syncspeed received by a gear (13)
[Controller] Syncspeed received by a gear (3)
[Gear (70)] has syncSpeed
[Controller] Syncspeed received by a gear (70)
[Gear (88)] has syncSpeed
[Controller] Syncspeed received by a gear (88)
[Gear (53)] has syncSpeed
[Gear (64)] has syncSpeed
[Gear (62)] has syncSpeed
[Gear (93)] has syncSpeed
[Gear (39)] has syncSpeed
[Gear (65)] has syncSpeed
[Controller] Syncspeed received by a gear (53)
[Controller] Syncspeed received by a gear (64)
[Controller] Syncspeed received by a gear (62)
[Controller] Syncspeed received by a gear (93)
[Controller] Syncspeed received by a gear (39)
[Controller] Syncspeed received by a gear (65)
[Controller] all gears are back in town!

Sie können eine abwechselnd Leistung der verschiedenen Akteure (Getriebe und Regler). Aber wenn ich auf Scala 2.8 wechsle, erhalte ich eine Ausgabe wie diese:

[App] start with creating gears
[Gear (0)] created with speed: 995
[Gear (1)] created with speed: 40
[Gear (2)] created with speed: 483
[Gear (3)] created with speed: 920
[Gear (4)] created with speed: 339
[Gear (5)] created with speed: 422
[Gear (6)] created with speed: 258
[Gear (7)] created with speed: 603
[Gear (8)] created with speed: 40
[Gear (9)] created with speed: 399
[Gear (10)] created with speed: 347
[Gear (11)] created with speed: 339
[Gear (12)] created with speed: 559
[Gear (13)] created with speed: 697
[Gear (14)] created with speed: 18
[Gear (15)] created with speed: 568
[Gear (16)] created with speed: 271
[Gear (17)] created with speed: 239
[Gear (18)] created with speed: 889
[Gear (19)] created with speed: 933
[Gear (20)] created with speed: 793
[Gear (21)] created with speed: 494
[Gear (22)] created with speed: 683
[Gear (23)] created with speed: 41
[Gear (24)] created with speed: 738
[Gear (25)] created with speed: 291
[Gear (26)] created with speed: 833
[Gear (27)] created with speed: 610
[Gear (28)] created with speed: 514
[Gear (29)] created with speed: 793
[Gear (30)] created with speed: 917
[Gear (31)] created with speed: 838
[Gear (32)] created with speed: 801
[Gear (33)] created with speed: 153
[Gear (34)] created with speed: 19
[Gear (35)] created with speed: 549
[Gear (36)] created with speed: 524
[Gear (37)] created with speed: 912
[Gear (38)] created with speed: 517
[Gear (39)] created with speed: 586
[Gear (40)] created with speed: 662
[Gear (41)] created with speed: 143
[Gear (42)] created with speed: 147
[Gear (43)] created with speed: 445
[Gear (44)] created with speed: 1
[Gear (45)] created with speed: 366
[Gear (46)] created with speed: 397
[Gear (47)] created with speed: 523
[Gear (48)] created with speed: 920
[Gear (49)] created with speed: 91
[Gear (50)] created with speed: 316
[Gear (51)] created with speed: 573
[Gear (52)] created with speed: 956
[Gear (53)] created with speed: 615
[Gear (54)] created with speed: 636
[Gear (55)] created with speed: 385
[Gear (56)] created with speed: 422
[Gear (57)] created with speed: 574
[Gear (58)] created with speed: 882
[Gear (59)] created with speed: 274
[Gear (60)] created with speed: 371
[Gear (61)] created with speed: 971
[Gear (62)] created with speed: 999
[Gear (63)] created with speed: 990
[Gear (64)] created with speed: 367
[Gear (65)] created with speed: 646
[Gear (66)] created with speed: 957
[Gear (67)] created with speed: 187
[Gear (68)] created with speed: 432
[Gear (69)] created with speed: 472
[Gear (70)] created with speed: 899
[Gear (71)] created with speed: 325
[Gear (72)] created with speed: 615
[Gear (73)] created with speed: 315
[Gear (74)] created with speed: 425
[Gear (75)] created with speed: 441
[Gear (76)] created with speed: 679
[Gear (77)] created with speed: 125
[Gear (78)] created with speed: 706
[Gear (79)] created with speed: 455
[Gear (80)] created with speed: 15
[Gear (81)] created with speed: 155
[Gear (82)] created with speed: 669
[Gear (83)] created with speed: 590
[Gear (84)] created with speed: 457
[Gear (85)] created with speed: 574
[Gear (86)] created with speed: 1
[Gear (87)] created with speed: 472
[Gear (88)] created with speed: 763
[Gear (89)] created with speed: 329
[Gear (90)] created with speed: 385
[Gear (91)] created with speed: 176
[Gear (92)] created with speed: 674
[Gear (93)] created with speed: 528
[Gear (94)] created with speed: 702
[Gear (95)] created with speed: 328
[Gear (96)] created with speed: 82
[Gear (97)] created with speed: 833
[Gear (98)] created with speed: 101
[Gear (99)] created with speed: 950
[Controller] Send commands for syncing to gears!
[Controller] calculated syncSpeed: 504
[Controller] started all gears
[Gear (2)] has syncSpeed
[Gear (0)] has syncSpeed
[Gear (5)] has syncSpeed
[Gear (1)] has syncSpeed
[Gear (4)] has syncSpeed
[Gear (8)] has syncSpeed
[Gear (9)] has syncSpeed
[Gear (7)] has syncSpeed
[Gear (10)] has syncSpeed
[Gear (11)] has syncSpeed
[Gear (12)] has syncSpeed
[Gear (13)] has syncSpeed
[Gear (15)] has syncSpeed
[Gear (14)] has syncSpeed
[Gear (3)] has syncSpeed
[Gear (16)] has syncSpeed
[Gear (17)] has syncSpeed
[Gear (18)] has syncSpeed
[Gear (21)] has syncSpeed
[Gear (6)] has syncSpeed
[Gear (22)] has syncSpeed
[Gear (24)] has syncSpeed
[Gear (23)] has syncSpeed
[Gear (25)] has syncSpeed
[Gear (20)] has syncSpeed
[Gear (28)] has syncSpeed
[Gear (29)] has syncSpeed
[Gear (26)] has syncSpeed
[Gear (19)] has syncSpeed
[Gear (32)] has syncSpeed
[Gear (31)] has syncSpeed
[Gear (33)] has syncSpeed
[Gear (35)] has syncSpeed
[Gear (36)] has syncSpeed
[Gear (30)] has syncSpeed
[Gear (38)] has syncSpeed
[Gear (39)] has syncSpeed
[Gear (34)] has syncSpeed
[Gear (40)] has syncSpeed
[Gear (41)] has syncSpeed
[Gear (42)] has syncSpeed
[Gear (27)] has syncSpeed
[Gear (45)] has syncSpeed
[Gear (46)] has syncSpeed
[Gear (47)] has syncSpeed
[Gear (44)] has syncSpeed
[Gear (43)] has syncSpeed
[Gear (48)] has syncSpeed
[Gear (50)] has syncSpeed
[Gear (51)] has syncSpeed
[Gear (49)] has syncSpeed
[Gear (53)] has syncSpeed
[Gear (37)] has syncSpeed
[Gear (54)] has syncSpeed
[Gear (56)] has syncSpeed
[Gear (57)] has syncSpeed
[Gear (59)] has syncSpeed
[Gear (58)] has syncSpeed
[Gear (60)] has syncSpeed
[Gear (55)] has syncSpeed
[Gear (52)] has syncSpeed
[Gear (62)] has syncSpeed
[Gear (63)] has syncSpeed
[Gear (64)] has syncSpeed
[Gear (65)] has syncSpeed
[Gear (67)] has syncSpeed
[Gear (68)] has syncSpeed
[Gear (69)] has syncSpeed
[Gear (61)] has syncSpeed
[Gear (70)] has syncSpeed
[Gear (72)] has syncSpeed
[Gear (66)] has syncSpeed
[Gear (74)] has syncSpeed
[Gear (73)] has syncSpeed
[Gear (75)] has syncSpeed
[Gear (76)] has syncSpeed
[Gear (79)] has syncSpeed
[Gear (71)] has syncSpeed
[Gear (78)] has syncSpeed
[Gear (77)] has syncSpeed
[Gear (82)] has syncSpeed
[Gear (80)] has syncSpeed
[Gear (84)] has syncSpeed
[Gear (83)] has syncSpeed
[Gear (85)] has syncSpeed
[Gear (87)] has syncSpeed
[Gear (88)] has syncSpeed
[Gear (81)] has syncSpeed
[Gear (86)] has syncSpeed
[Gear (89)] has syncSpeed
[Gear (90)] has syncSpeed
[Gear (93)] has syncSpeed
[Gear (94)] has syncSpeed
[Gear (91)] has syncSpeed
[Gear (95)] has syncSpeed
[Gear (96)] has syncSpeed
[Gear (92)] has syncSpeed
[Gear (97)] has syncSpeed
[Controller] Syncspeed received by a gear (2)
[Controller] Syncspeed received by a gear (0)
[Controller] Syncspeed received by a gear (5)
[Controller] Syncspeed received by a gear (1)
[Controller] Syncspeed received by a gear (4)
[Controller] Syncspeed received by a gear (8)
[Controller] Syncspeed received by a gear (9)
[Controller] Syncspeed received by a gear (7)
[Controller] Syncspeed received by a gear (10)
[Controller] Syncspeed received by a gear (11)
[Controller] Syncspeed received by a gear (12)
[Controller] Syncspeed received by a gear (13)
[Controller] Syncspeed received by a gear (15)
[Controller] Syncspeed received by a gear (14)
[Controller] Syncspeed received by a gear (3)
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[Gear (98)] has syncSpeed
[Gear (99)] has syncSpeed
[Controller] Syncspeed received by a gear (45)
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[Controller] all gears are back in town!

Sie können sehen, dass es viel weniger wechselnde Schauspieler-Interaktionen gibt. Ich vermute, dass der Controller blockiert ist, während die Zahnräder arbeiten. Kann mir jemand dieses Verhalten erklären? Danke Philipp

3voto

Daniel C. Sobral Punkte 290004

Es gibt einige Probleme mit dem Code. In erster Linie sollte man das nicht tun:

object ActorApplication extends Application 

Wenn Sie extends Application Die Art und Weise, wie Ihr Code ausgeführt wird, bringt eine Reihe von Einschränkungen mit sich, z. B. dass er vom JIT nicht optimiert werden kann und, was für Ihren Fall besonders wichtig ist, dass Threads nicht korrekt funktionieren. Ich finde es schwieriger zu erklären, was mit 2.7.7 passiert ist als mit 2.8. Schreiben Sie stattdessen einfach ein normales Objekt, und definieren Sie die main Methode.

Andere Sachen:

gearController ! StartSync()

Tun Sie das nicht. Senden Sie immer eine Nachricht an einen Akteur aus dem Inneren eines Akteurs, und diese Zeile befindet sich innerhalb ActorApplication Konstruktor, der kein Akteur ist. In Situationen wie dieser können Sie Folgendes tun:

Actor.actor { gearController ! StartSync() }

Apropos StartSync Tun Sie das nicht:

case class StartSync

Eine Klasse ohne Parameter ist sinnlos (und veraltet). Tun Sie stattdessen dies:

case object StartSync

und lassen Sie die Klammer nach StartSync an den Orten, an denen Sie es verwenden.

Es ist auch nichts falsch daran scala.util.Random obwohl es unter Scala 2.7 einfacher war, sie zu missbrauchen als unter Scala 2.8, indem man eine neue Random Generator jedes Mal, wenn Sie eine Zufallszahl benötigen (was Sie im Code auch tun). Stattdessen sollte bei Scala 2.8 nur dies funktionieren:

  private var mySpeed = scala.util.Random.nextInt(1000)

Letztlich ist an beiden Ausführungen nichts auszusetzen, nur der Planer ist unterschiedlich. Wenn man bedenkt, dass Sie hundert Akteure erstellt haben, ist die GearController erhielt in der Scala 2.7-Version unverhältnismäßig viel Ausführungszeit, da Scala nicht für jeden Akteur einen Thread erstellt.

Wenn Sie also wollen GearController ein Thema nicht mit den anderen teilen möchten, sollten Sie while(true) / receive 代わりに loop / react etwa so:

    while(true) {
      receive {
        case StartSync => {

Dies führt zu einem Ergebnis, das dem von 2.7 sehr ähnlich ist.

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