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![Akka - what is it? 1/2
a platform,
"for building highly concurrent, distributed, and resilient message-driven
applications on the JVM."[1],
based on the actor model.](https://image.slidesharecdn.com/prez-150428163747-conversion-gate01/85/An-Introduction-to-Akka-2-320.jpg)
![Actor model - what is it?
actor: unit of computation
actors build actor systems
quite "old" (1973).[2]](https://image.slidesharecdn.com/prez-150428163747-conversion-gate01/85/An-Introduction-to-Akka-4-320.jpg)
![My first Akka Actor™
class HaiActor extends Actor {
def receive: Receive = {
case target: ActorRef => target ! "Hello!"
case "Hello!" => sender ! "OHAI"
case "OHAI" => println(s"$self: got OHAI from
$sender")
}
}
Where:
type Receive = PartialFunction[Any, Unit]](https://image.slidesharecdn.com/prez-150428163747-conversion-gate01/85/An-Introduction-to-Akka-7-320.jpg)
Uploaded bySoftwareMill
An Introduction to Akka
Akka is a platform for building highly concurrent, distributed, and resilient message-driven applications on the JVM based on the actor model. The actor model defines actors as units of computation that build actor systems. Akka provides guarantees around message delivery and ordering to make reasoning about concurrency and distribution easier. It also includes tools for testing, remoting, and interacting with actor systems.
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An Introduction to Akka
- 1. An Introduction toAkka Mikołaj Koziarkiewicz
- 2. Akka - whatis it? 1/2 a platform, "for building highly concurrent, distributed, and resilient message-driven applications on the JVM."[1], based on the actor model.
- 3. Akka - whatis it? 2/2 platform has a lot of specialized extensions all based on the actor core goal of the presentation: explain the core
- 4. Actor model -what is it? actor: unit of computation actors build actor systems quite "old" (1973).[2]
- 5. Anatomy of anAkka Actor - intro 1/2 class MyActor extends Actor { def receive = { case Something => //... } }
- 6. Anatomy of anAkka Actor - intro 2/2
- 7. My first AkkaActor™ class HaiActor extends Actor { def receive: Receive = { case target: ActorRef => target ! "Hello!" case "Hello!" => sender ! "OHAI" case "OHAI" => println(s"$self: got OHAI from $sender") } } Where: type Receive = PartialFunction[Any, Unit]
- 8. My first AkkaActor™ - example
- 9. Anatomy of anAkka Actor - hierarchy
- 10. Akka actor model- lifecycle & hierarchy Purpose: division of labor supervision: each actor has lifecycle special hooks - preStart, preRestart, postStop allow for e.g. self-init "parent" controls how it reacts to failure
- 11.
- 12. Akka - guarantees anactor processes one message at a time, a message will be delivered at most 1 times, messages are ordered by sender
- 13. Guarantee takeaways don’t passmutable state, use services to ensure send: contex.scheduler persistence
- 14. Testing Akka Testkit Features: can runspecial 1-thread dispatcher asserts for getting msgs TestProbe
- 15.
- 16. Talking to actorsystem Custom: ask pattern ask(actoRef, request)(timeout): Future Many others (also builtin)
- 17. Summary Akka - actormodel on the JVM alternative way to handle concurrency distribution declared guarantees make reasoning easier
- 18. THANK YOU! The End Doclink: http://doc.akka.io/docs/akka/current/scala.html Bibliography http://akka.io , retrieved 2015-04-20 https://en.wikipedia.org/wiki/History_of_the_Actor_model , retrieved 2015-04-12