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奇怪的行爲：斯卡拉演員2.7.7對2.8-快照

2010-02-04 37 views
4

我是一個18歲的學員，我發現了我非常喜歡的scala :-)。 爲了熟悉斯卡拉演員，我用一些齒輪和一個控制器編寫了一個小模擬。 ActorApplication以隨機速度創建N個齒輪。控制器計算同步速度並啓動齒輪。齒輪逐步同步到這個給定的速度（1+或1-）。當所有齒輪達到同步速度時，模擬結束。 我開發了scala 2.7.7中的模擬 - 並且它按照我的預期工作（請參見下面的輸出）。但是，當我轉向當前的2.8.0-SNAPSHOT時，我發現了奇怪的行爲。 這是代碼：奇怪的行爲：斯卡拉演員2.7.7對2.8-快照

/** 
* 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) 
    } 
}

上面的代碼生成階2.7.7等的輸出：

[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!

可以看到一個交替不同的行動者的輸出（齒輪和控制器） 。但是，如果我改變爲斯卡拉2.8我得到這樣的輸出：

[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) 
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[Gear (98)] has syncSpeed 
[Gear (99)] has syncSpeed 
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[Controller] all gears are back in town!

你可以看到，交替演員互動少得多。我懷疑控制器在齒輪工作時被堵塞。有人可以解釋這種行爲嗎？謝謝 菲利普

來源

2010-02-04 meip

回答

3

代碼有一些問題。其中最重要的，不這樣做：

object ActorApplication extends Application

當您使用extends Application，你的代碼的運行方式規定了一些限制，如不是由JIT優化的，並以你的情況特別相關的，線程將無法正常工作。我很難解釋2.7.7發生的事情比2.8發生的事情更難解釋。相反，只需編寫一個普通對象，並定義main方法。

其他的東西：

gearController ! StartSync()

不要這樣做。始終從演員內部向演員發送消息，並且此行位於ActorApplication構造函數內，該演員不是演員。在這樣的情況下，你可以這樣做：

Actor.actor { gearController ! StartSync() }

說到StartSync，不這樣做：

case class StartSync

類不帶參數是沒有意義的（和不建議使用）。相反，這樣做：

case object StartSync

，並在您使用它的地方StartSync後下降的括號。

另外，scala.util.Random沒什麼錯，雖然在Scala 2.7上比在Scala 2.8上更容易誤用它，每當你需要一個隨機數時創建一個新的Random發生器（這就是你在碼）。相反，在斯卡拉2.8，僅這應該工作：

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

最後，有什麼不對要麼執行，它只是它們之間不同的調度。事實上，鑑於你創建了一百個演員，在Scala 2.7版本中，GearController接收到的執行時間不成比例，因爲Scala並沒有爲每個演員創建一個線程。現在

，如果你想GearController不共享與其他線程，你應該使用while(true)/receive，而不是loop/react，像這樣：

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

這將產生非常相似的結果是什麼2.7出品。

來源

2010-02-08 22:55:48

+1

謝謝丹尼爾您的有用答案。我做了更改，我的代碼在Scala 2.8中運行良好。我將爲這個模擬做一個簡單的Scala-swing-GUI，並在github上發佈它。 – meip

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