My slides from JavaDay 2011 Kyiv

1. АКТЁРЫ В JVM
Простая архитектура для
конкурентных отказоустойчивых
масштабируемых Java-приложений

2. Данные

3. Данные

4. Данные

5. Данные

6. Данные

7. Данные

8. Данные

9. Данные

10. Данные

12. Данные

13. Данные

14. Данные

15. Calculate
Get Lock
Modify Данные
Release
Lock

16. Get Lock A
Modify A
IF (cond) Get Lock B A
Modify B B
Release Release
Lock A Lock B

17. Get Lock A
Modify A
Get Lock A
Get Lock B
Modify A
Modify B
Release
Lock A
Release
Lock B
Release
Lock A

18. 2
1 Get Lock B
Get Lock A
2
1 Modify B
Modify A
2
Get Lock A
1 1
IF (cond) Get Lock B
2
Modify B
1
Modify B
2
Release A
1 1
Release A Release B
2
Release B

19. 1 1 2
Get Lock A Get Lock A Get Lock B
1 1 2
Modify A Modify A Modify B
1 1 2
Get Lock B Get Lock B Get Lock A
1 1 2
Modify B Modify B Modify B
2
1 1 Release A
Release B Release B
2
2 1 Release B
Get Lock B Release A 1
Get Lock A
2 2
Modify B Get Lock B 1
Modify A
1 2
Release A Modify B 1
Get Lock B
2 2
Get Lock A Get Lock A 1
2 2 Modify B
Modify B Modify B
1
2 2 Release B
Release A Release A
2 2 1
Release B Release B Release A

20. 1 1 2 2
Get Lock A Get Lock A Get Lock B Get Lock B
1 1 2 2
Modify A Modify A Modify B Modify B
1 1 2 1
Get Lock B Get Lock B Get Lock A Get Lock A
1 1 2 1
Modify B Modify B Modify B Modify A
2
1 1 Release A 1
Release B Release B Get Lock B
2
2 1 Release B 2
Get Lock B Release A 1 Get Lock A
Get Lock A
2 2
Modify B Get Lock B 1
Modify A
1 2
Release A Modify B 1
Get Lock B
2 2
Get Lock A Get Lock A 1
2 2 Modify B
Modify B Modify B
1
2 2 Release B
Release A Release A
2 2 1
Release B Release B Release A

21. От чего избавиться?
Что улучшить?

22. Взаимные блокировки
Последовательный доступ

23. Разделяемая память
Синхронные вызовы
Очередь событий

24. Актер =
состояние + поведение +
почтовый ящик

25. A

26. A AA A A
A AAAA
A
A A A AA A
A A A
AA A
A AA A AA A
A A AA A
AA
AA AA
A AA A

27. A

28. A Данные

29. A Данные
A A

30. A Данные
A A
A

31. A A

32. A A

33. A A
AA
A A A

34. A A
AA
A A A
A
A A
A

36. A
A

37. A
Action Action
Action
Action

38. A
Action
F
Action
Get! F Action
Action F

39. A
Action
F
Action
Action
Action
Action F
Get!
F

41. Данные

43. A4
A8

44. A4
A8

45. Call! Action
Action
Action Return
Action

46. Action Action
Action Action
Return Return

48. A
Данные
Данные
копия A
Данные
копия 2

49. A
A A A
A
A
→

50. ?

52. A
Start

53. A
Login
A A
Start Register
A
Email
Dispatcher

54. A
Login

55. A
Login
A
Login
A
Login A
Login
A
Login

56. A
Sender
A
Sender
A
Email A
Dispatcher Sender
A
Sender

57. A A
UserSession1 User1
A
Login

58. A A
UserSession1 User1
A A
Login UserSession2
A
User2

59. A A
UserSession1 User1
A A
Login UserSession2
A A
UserSession3 User2

60. A
A A
UserSession1
A

61. A A
UserSession1 Document1

62. A A
UserSession1 Document1
A
Document7

63. A A
UserSession3 Document4
A A
UserSession1 Document1
A A
UserSession5 Document7

64. A A A
Login Session User
A A
Start Register
A
Document
A
Email
Dispatcher

66. A A
Session User
A
Document

67. A
Session1

68. A
Session1
A
Document1

69. A
Session1
A
Document1
A A A A
User User User User

70. A
Document1
A A A A
User1 User2 User3 User4

71. A
Document1
A A A A
User1 User2 User3 User4
A A A A A A
Session1 Session2 Session3 Session4 Session5 Session6

72. A Данные
Document1

73. A Данные
Document1

74. A Данные

75. A Данные
GET
Данные
Копия
Данные
Копия

76. A Данные
UPDATE

77. Actor

78. A
UserSession1 User1
A A
Login UserSession2
A A
UserSession3 User2

79. To:
Session1
A A
Login UserSession2
A A
UserSession3 User2

80. To:
Session1
A A
Login UserSession2
A A
UserSession3 User2

81. To:
Session1
A A
UserSession1 User1
A A
Login UserSession2
A A
UserSession3 User2

82. GET
A Данные
Данные
Копия Данные
Копия

83. A A
UserSession1 User1
A A
Login UserSession2
A
UserSession3 User2

84. A A
UserSession1 User1
A
Login UserSession2
UserSession3 User2

85. A A
UserSession1 User1
A
Login

92. A

93. A

96. A
A
A
A

97. F A
F A
F A
F A

98. F A
F A
F
F A
F A

99. F A
F A
F
F A
F A

100. F A
F A
F
F A
F A

103. akka.io

106. import akka.actor.Actor
import akka.event.EventHandler
public class HelloActor extends Actor {
def receive = {
case "hello" => HelloService().hi
case s: String => HelloService().sayHello(s)
case _ => EventHandler.info(this, "unknown message")
}
}

107. //Start
val actorRef = Actor.actorOf[MyActor]
actorRef.start()
//Send message
actorRef ! "hello"
actorRef ! new Date()
//Obtain actors
val actors = Actor.registry.actorsFor(classOf[HelloActor])

108. //Ask
val response = actorRef ? "hello"
//Get result
val result = response.get
Actor.become( newRecieveFunction )

110. import akka.actor.UntypedActor;
import akka.event.EventHandler;
public class HelloActor extends UntypedActor {
public void onReceive(Object message) {
if (message instanceof String) {
HelloService.getInstance().sayHello(message);
}
}
}

111. //Start
ActorRef ref = Actors.actorOf(HelloActor.class);
ref.start();
//Send message
ref.tell("hello");
ref.tell(new Date());
//Obtain actors
ActorRef[] actors =
Actors.registry().actorsFor(HelloActor.class);

112. //Ask
Future response = actorRef.ask("hello");
…
//Get result
String result = response.get();
//Hello, synchronous call! Long time no see.
String syncResult = actorRef.ask("hello").get();

113. • Actors
• Typed Actors
• Supervisors
• Routing
• Futures
• STM
• FSM
• TestKit

114. class SomeSpec extends … TestKit {
"A Worker" must {
"send timely replies" in {
val worker = actorOf(...)
within (500 millis) {
worker ! "some work"
}
}
}
}

116. Виктор Тесленко
victor@teslenko.com.ua
twitter: @vir