Implementing Lock Free Concurrency with AKKA

Sameer Arora

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Agenda● Actor Model for Concurrency.

● Actors V Threads.

● Sleeping Barber Problem.

● Introduction to Akka.

● Demo

● Questions & Feedback

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Actors● Are Objects that communicate only by means of Asynchronous message passing.

● Do not expose their state to other objects/actors.

● Provide a Non Blocking,highly performant event-driven programming model .

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Actors V Threads● Writing Concurrent programs using Threads is too hard to write and test.

● Shared Memory Model causes Race Conditions, Lowered throughput, deadlocks.

● Actors are Lightweight - consume ~600 bytes memory.

● Do not map one-to-one with OS Threads.

● Actors remain in a suspended state – function via Schedulers running underneath.

● Actors Offer a Lock-free approach to concurrency – helps in Scaling and increased Throughput.

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Sleeping Barber Problem

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AKKA

● Provides a Run time for Actors Programming model.

● Manages the Actors life-cycle

● Has API for Java and Scala .

● Provides Integration with Spring Integration,Apache Camel, Google Guice etc.

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Demo

Sleeping Barber problem with Akka

Simple Routing Application on Akka

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Questions/Comments/Feedback