reactive application

Reactive Application

Christophe Marchal Rafael Souza@toff63 @rafael_psouza

Object Oriented ProgrammingHard to reuse objects

Functional ProgrammingEasy to reuse small functions

Functional Paradigm: Composition

“In modern applications involving highly concurrent computing on multicore machines, state is the problem”

Functional programming: A step backward - infoworld.com

Functional Paradigm: Stateless

Tools for application development

Evolution of large applications

Response Time

Uptime

Data Size

Hosting

“reacting to events or situations rather than acting first to change or prevent something”

Cambridge

“Showing a response to a stimulus” Oxford

What Reactive means?

Reactive traits

Scaling up

Scaling out

Concurrency handled by container

More user, more thread

Efficiency issue

Thread dump result

Computer time scale

Paradigm shift: Event driven

Scala Future

Handling failure

Traditional Failure Handling

Node stop responding

Domino effect

Bulkhead pattern

● Stateful

● Asynchronous

● Only communicate through message

Create Bulk: Actors

Actor tree

Akka: Supervision

Akka: Supervision

Streaming data to the screen

Using Play! 2.3-M2

Websocket

Controller

Backend Actor

Thanks!Obrigado!

Christophe Marchal Rafael Souza@toff63 @rafael_psouza