Introduction to Akka
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This document provides an introduction to Akka actors. It discusses how actors provide a model for building concurrent and distributed applications by avoiding shared mutable state and instead using message passing. Actors communicate asynchronously by message passing and handle errors through a supervision hierarchy. The document outlines several features of the actor model including load balancing, parallelization, and error handling.
Introduction to Akka
- 1. An introduction to Actors Akka with Johan Andr辿n 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, dont 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 Andr辿n johan.andren@mejsla.se | @apnylle
- 32. Questions? Johan Andr辿n johan.andren@mejsla.se | @apnylle