building reactive apps

Building Reactive Applications

James Wardwww.jamesward.com@_JamesWard

Agenda

• Intro to Reactive• The Typesafe Platform– Typesafe Activator– Play Framework– Akka– Scala– Tools• Questions

Software is becoming Reactive

Tenets of Reactive Software

ReactiveManifesto.org

The Typesafe Reactive Platform

Performance

Go Reactive with Typesafe Activator

Play FrameworkThe High Velocity Web Framework For Java and Scala

Actors

• Event-driven• Managed concurrency• Resilience & supervision• Scales up & out• Non-request based lifecycle

Go Reactive!

Reactive Web / Mobile Apps

• Reactive Request– Async & Non-Blocking Request & Response• Reactive Composition– Reactive Request + Reactive Request + ...• Reactive Push– Stream Producer• 2-way Reactive = Bi-Directional Reactive Push• Reactive UIs– Interactive, Data Synchronization, Real-time Collaboration

Actors

• event-driven• managed concurrency• resilience & supervision• non-request based lifecycle

Request/Response: Traditional vs. Reactive

def getTweets = Action { Ok(WS.get("http://twitter.com/"))}

Client Server Serviceblocking blocking

def getTweets = Action { Async { Ok(WS.get("http://twitter.com/"))}}

Client Server Servicenon-blocking

non-blocking

Streaming: Traditional vs. Reactive

// comet style pollingdef getNewTweets = Action { Ok(queuedEvents)}

Client Server Serviceblocking blocking

def streamTweets = Action { Ok.stream(eventProducer)}

Client Server Servicenon-blocking

non-blocking

2-way Reactive

ProducerConsumer

ConsumerProducer

non-blocking

Tooling

Testing

• JUnit• ScalaTest• Specs2•Gatling

Build Infrastructure

• sbt, Maven, Gradle• Jenkins, Bamboo• TDD, CI, CD

Deployment

• Containerless• Play–Stateless• Canary Deployments• Rolling Upgrades• Schema Evolutions

• Akka–Clustering in 2.2 with Segmented Upgrades

Monitoring

• Typesafe Console• New Relic• Takipi• AppDynamics

Reactive Scales

Go Reactive!

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