السلوك الغريب: ممثلو Scala 2.7.7 مقابل 2.8-SNAPSHOT

https://stackoverflow.com/questions/2198767

25-09-2019
|

سؤال

أنا متدرب يبلغ من العمر 18 عامًا وأكتشف سكالا التي أحبها كثيرًا :-). للتعرف على ممثلي سكالا ، كتبت محاكاة صغيرة مع بعض التروس ووحدة تحكم واحدة. Austorapplication يخلق التروس n بسرعة عشوائية. يحسب وحدة التحكم سرعة التزامن وتبدأ أدوات الترس. تتزامن التروس مع هذه السرعة المعطاة خطوة بخطوة (1+ أو 1-). تم الانتهاء من المحاكاة عندما وصلت جميع التروس إلى سرعة التزامن. لقد طورت المحاكاة في Scala 2.7.7 - وعملت كما توقعت (انظر الإخراج أدناه). ومع ذلك ، عندما كنت أتجه إلى 2.8.0-snapshot الحالي ، اكتشفت سلوكًا غريبًا. هذا هو الرمز:

/**
 * 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)
  }
}

يولد الرمز أعلاه في Scala 2.7.7 إخراج مثل:

[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!

يمكنك رؤية بالتناوب إخراج الجهات الفاعلة المختلفة (التروس ووحدة التحكم). ولكن إذا تغيرت إلى Scala 2.8 أحصل على إخراج مثل هذا:

[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)
[Controller] Syncspeed received by a gear (16)
[Controller] Syncspeed received by a gear (17)
[Controller] Syncspeed received by a gear (18)
[Controller] Syncspeed received by a gear (21)
[Controller] Syncspeed received by a gear (6)
[Controller] Syncspeed received by a gear (22)
[Controller] Syncspeed received by a gear (24)
[Controller] Syncspeed received by a gear (23)
[Controller] Syncspeed received by a gear (25)
[Controller] Syncspeed received by a gear (20)
[Controller] Syncspeed received by a gear (28)
[Controller] Syncspeed received by a gear (29)
[Controller] Syncspeed received by a gear (26)
[Controller] Syncspeed received by a gear (19)
[Controller] Syncspeed received by a gear (32)
[Controller] Syncspeed received by a gear (31)
[Controller] Syncspeed received by a gear (33)
[Controller] Syncspeed received by a gear (35)
[Controller] Syncspeed received by a gear (36)
[Controller] Syncspeed received by a gear (30)
[Controller] Syncspeed received by a gear (38)
[Controller] Syncspeed received by a gear (39)
[Controller] Syncspeed received by a gear (34)
[Controller] Syncspeed received by a gear (40)
[Controller] Syncspeed received by a gear (41)
[Controller] Syncspeed received by a gear (42)
[Controller] Syncspeed received by a gear (27)
[Gear (98)] has syncSpeed
[Gear (99)] has syncSpeed
[Controller] Syncspeed received by a gear (45)
[Controller] Syncspeed received by a gear (46)
[Controller] Syncspeed received by a gear (47)
[Controller] Syncspeed received by a gear (44)
[Controller] Syncspeed received by a gear (43)
[Controller] Syncspeed received by a gear (48)
[Controller] Syncspeed received by a gear (50)
[Controller] Syncspeed received by a gear (51)
[Controller] Syncspeed received by a gear (49)
[Controller] Syncspeed received by a gear (53)
[Controller] Syncspeed received by a gear (37)
[Controller] Syncspeed received by a gear (54)
[Controller] Syncspeed received by a gear (56)
[Controller] Syncspeed received by a gear (57)
[Controller] Syncspeed received by a gear (59)
[Controller] Syncspeed received by a gear (58)
[Controller] Syncspeed received by a gear (60)
[Controller] Syncspeed received by a gear (55)
[Controller] Syncspeed received by a gear (52)
[Controller] Syncspeed received by a gear (62)
[Controller] Syncspeed received by a gear (63)
[Controller] Syncspeed received by a gear (64)
[Controller] Syncspeed received by a gear (65)
[Controller] Syncspeed received by a gear (67)
[Controller] Syncspeed received by a gear (68)
[Controller] Syncspeed received by a gear (69)
[Controller] Syncspeed received by a gear (61)
[Controller] Syncspeed received by a gear (70)
[Controller] Syncspeed received by a gear (72)
[Controller] Syncspeed received by a gear (66)
[Controller] Syncspeed received by a gear (74)
[Controller] Syncspeed received by a gear (73)
[Controller] Syncspeed received by a gear (75)
[Controller] Syncspeed received by a gear (76)
[Controller] Syncspeed received by a gear (79)
[Controller] Syncspeed received by a gear (71)
[Controller] Syncspeed received by a gear (78)
[Controller] Syncspeed received by a gear (77)
[Controller] Syncspeed received by a gear (82)
[Controller] Syncspeed received by a gear (80)
[Controller] Syncspeed received by a gear (84)
[Controller] Syncspeed received by a gear (83)
[Controller] Syncspeed received by a gear (85)
[Controller] Syncspeed received by a gear (87)
[Controller] Syncspeed received by a gear (88)
[Controller] Syncspeed received by a gear (81)
[Controller] Syncspeed received by a gear (86)
[Controller] Syncspeed received by a gear (89)
[Controller] Syncspeed received by a gear (90)
[Controller] Syncspeed received by a gear (93)
[Controller] Syncspeed received by a gear (94)
[Controller] Syncspeed received by a gear (91)
[Controller] Syncspeed received by a gear (95)
[Controller] Syncspeed received by a gear (96)
[Controller] Syncspeed received by a gear (92)
[Controller] Syncspeed received by a gear (97)
[Controller] Syncspeed received by a gear (98)
[Controller] Syncspeed received by a gear (99)
[Controller] all gears are back in town!

يمكنك أن ترى أن هناك تفاهات ممثل أقل بكثير. أظن أن وحدة التحكم محظورة أثناء عمل التروس. هل يمكن لأحد أن يشرح هذا السلوك؟ شكرا فيليب

المحلول

هناك بعض المشاكل مع الكود. وأهم ما بينهم ، لا تفعل هذا:

object ActorApplication extends Application

عندما تستخدم extends Application, ، الطريقة التي يتم تشغيل الكود الخاص بك تفرض عددًا من القيود ، مثل عدم التحسين بواسطة JIT ، وذات صلة خاصة بحالتك ، لن تعمل المواضيع بشكل صحيح. أجد صعوبة في شرح ما حدث في 2.7.7 مما حدث في 2.8. بدلاً من ذلك ، اكتب كائنًا عاديًا ، وحدد main طريقة.

اشياء اخرى:

gearController ! StartSync()

لا تفعل هذا. أرسل دائمًا رسالة إلى ممثل من داخل ممثل ، وهذا الخط في الداخل ActorApplication مُنشئ ، وهو ليس ممثلًا. في مثل هذه المواقف ، يمكنك القيام بذلك:

Actor.actor { gearController ! StartSync() }

بالحديث عن StartSync, ، لا تفعل هذا:

case class StartSync

فئة بدون معايير لا معنى لها (وتجاهلها). بدلاً من ذلك ، افعل هذا:

case object StartSync

وإسقاط الأقواس بعد StartSync في الأماكن التي تستخدمها.

أيضا ، لا حرج في scala.util.Random, ، على الرغم من أنه كان من الأسهل إساءة استخدامه على Scala 2.7 مما هو عليه في Scala 2.8 ، عن طريق إنشاء جديد Random المولد في كل مرة تحتاج فيها إلى رقم عشوائي (وهو ما تفعله في الكود). بدلاً من ذلك ، على Scala 2.8 ، يجب أن يعمل هذا فقط:

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

أخيرًا ، لا حرج في أي من التنفيذ ، إنه مجرد جدولة مختلفة بينهما. في الواقع ، بالنظر إلى أنك أنشأت مائة ممثل ، GearController كان يتلقى كمية غير قابلة للتنفيذ من وقت التنفيذ في إصدار Scala 2.7 ، حيث لا تقوم Scala بإنشاء مؤشر ترابط لكل ممثل.

الان اذا اردت GearController عدم مشاركة موضوع مع الآخرين ، يجب استخدامك while(true)/receive بدلاً من loop/react, ، مثله:

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

والتي سوف تنتج نتيجة مماثلة تماما لما تم إنتاجه 2.7.

مرخصة بموجب: CC-BY-SA مع الإسناد

لا تنتمي إلى StackOverflow