Felipe Mamud@ftmamud

Raphael Almeida@raphait

Reactive Programming

no mundo () -> “Java”

Agradecimentos

INTERNET USERS2.4bi

2012

INTERNET USERS3.01bi

TENS OF SERVERS

Fontes: http://recode.net/2014/05/28/meeker-as-internet-user-growth-slows-the-real-driver-is-mobile-usage/http://www.slideshare.net/wearesocialsg/digital-social-mobile-in-2015

RESPONSE TIMESECONDS

CLOUD-BASED CLUSTERMULTICORE

OFFLINE MAINTENANCE

REAL TIMEMILLISEC/MICROSEC

100% UPTIME

FAST DATA

GIBABYTE DATA

BIGDATA

PETABYTES

2015

Como criamos sistemas mais robustos, mais resilientes, mais flexíveis e muito mais capazes de responder às exigências de hoje em dia?

Precisamos de sistemas que irão:

● Reagir a eventos (Event-Driven)

● Reagir a carga (Scalable)

● Reagir a falhas (Resilient)

● Reagir a usuários (Responsive)

Reactive Programming“Readily responsive to a stimulus”

O que são sistemas Reativos?

Sistemas criados como Reativos são muito mais flexíveis, desacoplados e escaláveis. Isso os torna

mais fáceis de desenvolver e manter. São mais tolerantes a falhas e quando elas ocorrem são tratadas com elegância ao invés de desastre.

Sistemas Reativos são responsivos, dando aos usuários feedbacks mais interativos.

Fonte: http://www.reactivemanifesto.org/pt-BR

Reactive Manifesto

Message-Driven“Reactive Systems rely on asynchronous

message-passing”

Share Mutable State

Immutability

Avoid Block

Asynchronous

Some t ls

● Actors

● Agents

● Future/Dataflow

● Reactive Extensions (Rx)

Elastic“Capable of being easily expanded or

upgraded on demand”

Distribuited systems

Availability

Scalability

Asynchronous

“Almost” no limit to scalability.

Shared Nothing

Assynchronous communication

Location Transparency

Loose Coupling

Resilience“The ability of a substance or object to spring back into shape.”

“The capacity to recover quickly from difficulties.”

Failure recover

Manage failure locally

Avoid cascading failures

Isolate the failure

Responsive“Quick to respond or react appropriately”

Latency consistent

Batching

Back Pressure

Reactive Request

Java Reactive frameworksReactor

ReactiveX

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Felipe Mamud@ftmamud

Raphael Almeida@raphait

We are a reactive family