Spring Reactive - QConSP · spring-boot-starter-weþfl factld> @Controller, @RequestMapping Router...

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Spring Reactive

Transcript of Spring Reactive - QConSP · spring-boot-starter-weþfl factld> @Controller, @RequestMapping Router...

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Spring Reactive

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Sou Alberto :)

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Trabalho no grupo Caelum

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Reativo?

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Muitas opiniões

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Abstração do Observer

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Visão mais rebuscada

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Abstração para composição de eventos

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Consulta Serviço externo

Executa regra de negócio

Gera objeto para retorno

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Quem implementa isso para você?

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RX Java e Project Reactor

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Reactive Streams

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Para que serve isso?

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Onde esse código é executado?

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Thread por request

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E se pudesse rodar em outras threads?

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Ali já tem 4 funções

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Mono?

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Publicador de apenas uma informação

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Publicador de várias informações

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Quem executa o fluxo de funções?

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Spring Reactive!

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Camada reativa do Spring

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Como eu ativo isso?

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Netty?

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Não depende de Servlets

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Mas se integra :)

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Benefícios

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Delegação total da execução de código

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Pools de threads separados para vários momentos

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Pools especializados para códigos blocantes

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Maior escalabilidade com menor custo

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Bom encaixe para API

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Muito bom para drivers de bancos não relacionais

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Complexidades adicionais

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Modelo de programação diferente

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Talvez seja mais complicado de manter

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Drivers JDBC são blocantes

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Debug mais complicado

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Teste mais complicado

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Exceptions para indicar tipos de retorno

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Múltiplos pools não casam bem com ThreadLocal

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Dúvidas?

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github.com/asouza

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twitter.com/alberto_souza

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Cliente reativo

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Como consumimos as informações?

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Backpressure

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Não mande mais do que eu posso consumir

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Longe da realidade do povo


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