April 2025
Intermediate to advanced
324 pages
10h 14m
Portuguese (Portugal, Brazil)
Content preview from Criando microsserviços orientados a eventos
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Capítulo 7. Streaming com estado
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O streaming com estado é a base dos componentes mais importantes de um microsserviço orientado a eventos, já que a maioria das aplicações precisará manter algum grau de estado para seus requisitos de processamento. O capítulo "Materializando o estado a partir de eventos de entidade" abordou brevemente os princípios de materialização de um fluxo de eventos em estado local. Este capítulo analisa mais profundamente como criar, gerenciar e usar o estado para microsserviços orientados a eventos.
Armazenamento de estados e materialização de estados a partir de um fluxo de eventos
Começa com algumas definições:
- Estado materializado
-
Uma projeção de eventos do fluxo de eventos de origem (imutável)
- Loja estatal
-
Onde o estado comercial do teu serviço é armazenado (mutável)
Tanto o estado materializado quanto os armazenamentos de estado são necessários e usados extensivamente em microsserviços com estado, mas é importante fazer a distinção entre eles. Os estados materializados permitem-te utilizar entidades empresariais comuns nas tuas aplicações de microsserviços, enquanto os armazenamentos de estados permitem-te armazenar o estado empresarial eos cálculos intermédios.
A conceção de cada microsserviço deve também ter em conta o local onde o serviço irá armazenar os seus dados. Existem duas opções principais para armazenar e aceder ...
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