Introduction to Akka
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The topconf 2013 introduction to actors with Akka
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Introduction to Akka
- 1. An introduction to Actors Akka with Johan Andrén johan.andren@mejsla.se | @apnylle
- 2. Moores law 2,6 billions 1 million 2300 1971 1990 today
- 4. Oh No, Problems! • • • • • • Race conditions Data corruption Deadlocks Thread contention Livelocks Priority Inversion
- 5. Concurrency is HARD • • • • To write To test To debug To reason about We need a better model!
- 7. B C D A F E
- 10. State Inbox The only way to interact from outside Behaviour
- 11. • • • • • Single execution flow model No shared _mutable_ state Lightweight Loose coupling Easy to test
- 12. Actor A Actor B
- 13. One way communication Actor A Actor B
- 14. React, don’t wait Actor A Actor B
- 15. Load balancing Actor A Actor B1 router Actor B2
- 17. Parallellize Actor C1 Actor A Actor B (chef) Actor C2 Actor C2
- 18. • • • No work, no thread used! Async - never actively wait Loose coupling
- 19. JVM B C D A F E
- 21. The same same • • • Two actors on one core Two actors on separate cores Two actors on separate servers
- 22. Error handling in Actor systems
- 24. Traditional model • • • Leaking information between tiers Impossible to detect simultaneous errors The receiver does not know how to handle the errors!
- 25. Error handling with Actors (parent) Actor A Actor X Actor Z
- 26. Error handling with Actors (parent) Actor A Actor X Actor Z
- 27. Error handling with Actors Actor A Actor X Actor Z
- 28. ”Supervision” • • • • Compartmentilization What goes back is explicit Separating error handling and business logic Can detect simultaneous errors
- 29. But Wait, there is more! • • • • • STM Remoting Clustring with no SPoF MQs integration Eventbus Website: akka.io
- 30. Try it out! Typesafe Activator typesafe.com
- 31. Recap • • • • Simple but powerful model Lightweight and fast Loose coupling Resiliency Johan Andrén johan.andren@mejsla.se | @apnylle
- 32. Questions? Johan Andrén johan.andren@mejsla.se | @apnylle