Having a problem in writing concurrent programs? Having to deal with threads, locks, race conditions, and so on is highly error-prone and can lead to code that is difficult to read, test, and maintain. The answer to your above-mentioned challenge is Akka Actors. It allows you to write concurrent code but without much of the pain doing so compared to writing your code using threads and locks. Watch this webinar to explore the ways; how Akka actors facilitate and simplify the implementation of concurrent, distributed applications.

1. Fundamentals
Of Akka
Presented By: Manjot Kaur
Software Consultant
Knoldus Inc.
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2. 01 Akka : Introduction
02 The Actor Model
03 Akka Actors
04 Example
05 Challenges That Akka
solve.
Today’s Agenda

3. Akka
● Akka is a toolkit for building highly
concurrent, distributed, and resilient
message-driven applications for Java
and Scala.

4. ● The actor model was proposed decades ago by Carl Hewitt.
● It is a conceptual model to deal with concurrent computation.
.
● Consequently, organizations building distributed systems with demanding requirements encounter challenges that
cannot fully be solved with a traditional object-oriented programming (OOP) model, but that can benefit from the
actor model.
The Actor Model

5. The Actor Model

6. ●
The Actor Model

7. ● Create more actors.
● Send messages to other actors
.
● Designate what to do with the next
message
The Actor Model

8. The Actor Model

9. The Actor Model

10. Akka Actor
● There are many implementations of the Actor model : the most popular ones being Erlang/Elixir and Akka
● To get started with Akka we need to add the following dependency in build.sbt
libraryDependencies += "com.typesafe.akka" % "akka-actor_2.11" % "2.4.14"

11. Akka Actor : Example

12. Akka Actor : Example
● Behavior
● Actor Reference
● State
● Mailbox
● ChildActor
● Supervision Strategy

13. Akka : Ask and Tell
Messages are sent to an Actor through one of the following methods.
● ! means “fire-and-forget”, e.g. send a message asynchronously and return immediately. Also known as tell.
● ? sends a message asynchronously and returns a representing a possible reply. Also known as ask.

14. Top Level Actor Architecture

15. Challenges That Akka Solves
● Multi-threaded behavior without the use of low-level concurrency constructs like atomics or locks — relieving you
from even thinking about memory visibility issues.
● Transparent remote communication between systems and their components — relieving you from writing and
maintaining difficult networking code.
● A clustered, high-availability architecture that is elastic, scales in or out, on demand — enabling you to deliver a
truly reactive system.

16. References
● https://doc.akka.io/docs/akka/2.5/actors.html
● https://www.brianstorti.com/the-actor-model/
● https://bartoszsypytkowski.com/dont-ask-tell-2/

17. Thank You! Stay in Touch
info@knoldus.com
@Knolspea
k
www.knoldus.com
+(1) 647-467-4396