Downloaded 13 times
![A Tour of (Advanced)
Akka Features in 60
Minutes [CON1706]
Johan Janssen, Info Support
@johanjanssen42](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-1-2048.jpg)
![class Worker extends Actor {
def receive = {
case x =>
println(x)
}
}
val system = ActorSystem("ExampleActorSystem")
val workerActorRef = system.actorOf(Props[Worker])
workerActorRef ! "Hello conference"
Scala](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-10-2048.jpg)
![val workerActorRef = system.actorOf(Props[Worker])
workerActorRef ! "Hello conference"
val workerActorRef =
context.actorSelection("akka.tcp://
ExampleActorSystem@127.0.0.1:9005
/user/workerActor")
workerActorRef ! "Hello conference"](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-13-2048.jpg)
![akka {
actor {
provider =
"akka.remote.RemoteActorRefProvider"
}
remote {
enabled-transports =
["akka.remote.netty.tcp"]
netty.tcp {
hostname = "127.0.0.1"
port = 9002](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-14-2048.jpg)
![akka {
cluster {
seed-nodes = [
"akka.tcp://ClusterNode@127.0.0.1:2551",
"akka.tcp://ClusterNode@127.0.0.1:2552"
]
}
}](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-24-2048.jpg)
![akka {
actor {
provider = "akka.cluster.ClusterActorRefProvider"
deployment {
/coordinator/router {
router = round-robin-pool
nr-of-instances = 10
routees.paths = ["/user/emptystringactor"]
cluster {
enabled = on
allow-local-routees = off
}
}
}
}
}](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-32-2048.jpg)
![Routing
Coordinator
Actor on
JVM 1
EmptyString
Actor on
JVM 3
EmptyString
Actor on
JVM 4
EmptyString
Actor on
JVM 2""
HashMap[hostname, counter]](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-34-2048.jpg)
![Cluster singleton
Coordinator
EmptyString
Actor on
JVM 3
EmptyString
Actor on
JVM 4
EmptyString
Actor on
JVM 2""
HashMap[hostname, counter]](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-41-2048.jpg)
![Cluster singleton
Coordinator
EmptyString
Actor on
JVM 3
EmptyString
Actor on
JVM 4
EmptyString
Actor on
JVM 2""
HashMap[hostname, counter]](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-43-2048.jpg)
![Cluster singleton
Coordinator
EmptyString
Actor on
JVM 3
EmptyString
Actor on
JVM 4
""
HashMap[hostname, counter]](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-46-2048.jpg)
![Cluster singleton
Coordinator
EmptyString
Actor on
JVM 3
EmptyString
Actor on
JVM 4
""
HashMap[hostname, counter]](https://image.slidesharecdn.com/atourofadvancedakkafeaturesin60minutescon1706-160921210355/75/JavaOne-A-tour-of-advanced-akka-features-in-60-minutes-con1706-48-2048.jpg)
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JavaOne: A tour of (advanced) akka features in 60 minutes [con1706]
- 1. A Tour of(Advanced) Akka Features in 60 Minutes [CON1706] Johan Janssen, Info Support @johanjanssen42
- 2. Content ▪ Why Akka? ▪Local actor ▪ Remote actor ▪ Scheduling ▪ Cluster ▪ Routing ▪ Cluster singleton ▪ Sharding ▪ Persistence ▪ Akka HTTP ▪ Finite State Machines ▪ Conclusion ▪ Questions
- 3.
- 4. Why Akka? ▪ Concurrent ▪Scalable ▪ Fault tolerant ▪ More natural programming experience when connecting to other systems ▪ Easy to use?
- 6.
- 7.
- 8.
- 9. Local actor Coordinator Actor println("Helloconference")
- 10. class Worker extendsActor { def receive = { case x => println(x) } } val system = ActorSystem("ExampleActorSystem") val workerActorRef = system.actorOf(Props[Worker]) workerActorRef ! "Hello conference" Scala
- 11.
- 12. Remote actor Actor on JVM1 Actor on JVM 2
- 13. val workerActorRef =system.actorOf(Props[Worker]) workerActorRef ! "Hello conference" val workerActorRef = context.actorSelection("akka.tcp:// ExampleActorSystem@127.0.0.1:9005 /user/workerActor") workerActorRef ! "Hello conference"
- 14. akka { actor { provider= "akka.remote.RemoteActorRefProvider" } remote { enabled-transports = ["akka.remote.netty.tcp"] netty.tcp { hostname = "127.0.0.1" port = 9002
- 15.
- 16. Remote actor Coordinator actor Worker actor WorkerMessage Greetings fromthe coordinator: Hello Conference
- 17.
- 18.
- 19. Scheduling Actor Scheduled once after1 second Tick Scheduled every 5 seconds Tock system.scheduler.scheduleOnce(1 seconds, scheduleReceiveActor, Tick) system.scheduler.schedule(0 seconds, 5 seconds, scheduleReceiveActor, Tock)
- 20. Scheduling ▪ Does notwork for fixed point in time like 17:00 – Use Quartz
- 21.
- 22. Cluster ActorSystem on JVM 1 ActorSystem onJVM 3 ActorSystem on JVM 2 ActorSystem on JVM 4
- 23. Seed nodes ▪ Contactpoints for automatically joining a cluster
- 24. akka { cluster { seed-nodes= [ "akka.tcp://ClusterNode@127.0.0.1:2551", "akka.tcp://ClusterNode@127.0.0.1:2552" ] } }
- 25. Cluster Worker Node Port 2551 Associationfailed with [akka.tcp://ClusterSystem@127.0.0.1:2552
- 26. Cluster Worker Node Port 2551 Worker Node Port2552 Member Up with IP: 127.0.0.1 and port: 2551 Member Up with IP: 127.0.0.1 and port: 2552 Member Up with IP: 127.0.0.1 and port: 2551 Member Up with IP: 127.0.0.1 and port: 2552
- 27. Cluster Worker Node Port 2551 Worker Node Port2552 Member Up with IP: 127.0.0.1 and port: 2550 Member Up with IP: 127.0.0.1 and port: 2550 Coordinator Node Port 2550
- 28. Cluster Worker Node Port 2551 Worker Node Port2552 Coordinator Node Port 2550 RegisterWorker RegisterWorker
- 29. Cluster Worker Node Port 2551 Worker Node Port2552 Coordinator Node Port 2550 Worker registered with IP: 127.0.0.1 and port: 2551 Worker registered with IP: 127.0.0.1 and port: 2552
- 30.
- 31. Routing Actor on JVM 1 Actoron JVM 3 Actor on JVM 4 Actor on JVM 2 Loadbalancer
- 32. akka { actor { provider= "akka.cluster.ClusterActorRefProvider" deployment { /coordinator/router { router = round-robin-pool nr-of-instances = 10 routees.paths = ["/user/emptystringactor"] cluster { enabled = on allow-local-routees = off } } } } }
- 33. Routing Coordinator Actor on JVM 1 EmptyString Actoron JVM 3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2""
- 34. Routing Coordinator Actor on JVM 1 EmptyString Actoron JVM 3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2"" HashMap[hostname, counter]
- 35. Routing Coordinator Actor on JVM 1 EmptyString Actoron JVM 3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2 ""
- 36. Routing Coordinator Actor on JVM 1 EmptyString Actoron JVM 3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2 ""
- 37.
- 38. Cluster singleton ▪ Onlyone instance of the actor in the cluster ▪ (Re)created on the oldest node ▪ Can be used for instance for scheduling/caching
- 39. Cluster singleton Actor on JVM1 Other actors on JVM 3 Other actors on JVM 4 Singleton actor and other actors on JVM 2
- 40. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2""
- 41. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2"" HashMap[hostname, counter]
- 42. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2""
- 43. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2"" HashMap[hostname, counter]
- 44. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 EmptyString Actor on JVM 2 Crash
- 45. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 ""
- 46. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 "" HashMap[hostname, counter]
- 47. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 ""
- 48. Cluster singleton Coordinator EmptyString Actor on JVM3 EmptyString Actor on JVM 4 "" HashMap[hostname, counter]
- 49.
- 50. Sharding ▪ Dividing aset of actors over a cluster ▪ Actors will be divided into groups called shards ▪ It will divide based on a logical identifier
- 51. Sharding Actor on JVM 1 odd Shardon JVM 3 even Shard on JVM 2 0, 2, 4, 6, 8 1, 3, 5, 7, 9
- 52.
- 53. Persistence ▪ Store actorinformation ▪ Recover after crash ▪ Possibility to take snapshots
- 54.
- 55.
- 56.
- 57.
- 58.
- 59.
- 60.
- 61.
- 62.
- 63.
- 64.
- 65.
- 66.
- 67.
- 68.
- 69.
- 70.
- 71.
- 72.
- 73.
- 74. Snapshots Journal PersistentActor Snapshot store State until EventC++ Java C++ Cobol
- 75. Snapshots Journal PersistentActor Snapshot store State until EventC++ Crash Restart C++ Cobol Java
- 76. Snapshots Journal PersistentActor Snapshot store State until EventC++ C++ Cobol Java
- 77.
- 78.
- 79.
- 80.
- 81. Akka HTTP Actor on JVM1 Actor on JVM 2
- 82.
- 83. Finite State Machine ▪State ▪ Event
- 84. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Progress, iteration Progress, iteration Progress, iteration NoProgress Progress, 2
- 85. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Work harder Iteration: 0
- 86. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Good job! Iteration: 0
- 87. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Wrong direction Iteration: 0
- 88. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Use Akka Iteration: 0
- 89. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Good job! Iteration: 1
- 90. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Wrong direction Iteration: 1
- 91. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Use Akka Iteration: 1
- 92. Finite State Machines(FSM) Inprogress Project Crappy Project New Project Get another job! Iteration: 2
- 93.
- 94. Conclusion ▪ Akka canbe used with Scala or Java ▪ There is even a .NET version of Akka ▪ Akka is really powerful ▪ Akka is quite easy to use ▪ Some features are still experimental
- 95. Questions Johan Janssen @johanjanssen42 GitHub:https://github.com/johanjanssen/Akka-examples