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PREPARANDO NOSSA APLICAÇÃO PARA FALHAR COM
FEATURE TOGGLE E CONFIGURAÇÕES DISTRIBUÍDAS
Trilha Arquitetura Java
Emmanuel Neri
@emmanuelnerii
EMMANUEL NERI
‣ Mestre em Desenvolvimento de Tecnologia
‣ Desenvolvedor (Java) desde 2010
‣ Professor na FACEC
‣ Developer na Jaya Tech
FALHAS
POSSIBILIDADES
FALHAS LÓGICAS/NEGÓCIO
update order set value = 0;
FEATURE TOGGLE
Feature Toggles (often also refered to as Feature Flags) are a
powerful technique, allowing teams to modify system behavior
without changing code. They fall into various usage categories, and
it's important to take that categorization into account when
implementing and managing toggles.
https://martinfowler.com/articles/feature-toggles.html
FEATURE TOGGLE
‣ Flag dynamic
‣ Canary releasing
‣ A/B Testing
‣ Toggle Configuration
MONOLITO
feature.clients.active=true
feature.orders.active=true
feature.reports.active=true
feature.accounts.active=true
feature.crm.active=true
MICROSERVICES
MICROSERVICES
MICROSERVICES
feature.clients.active=true
feature.orders.active=true
feature.reports.active=true
feature.accounts.active=true
feature.crm.active=true
MICROSERVICES
instance 1 instance 2 instance 3
CONFIGURAÇÕES EM MICROSERVICES
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
CONFIGURAÇÕES EM MICROSERVICES
CONFIGURAÇÕES EXTERNAS
CONFIGURAÇÕES DISTRIBUÍDAS
TECNOLOGIAS
‣ Netflix Archaius
‣ Consul
‣ Spring Cloud Config
SPRING CLOUD CONFIG
REPOSITÓRIO
CÓDIGO FONTE FILE STORE
BANCO DE
DADOS
SPRING-CLOUD-CONFIG-SERVER SPRING-CLOUD-CONFIG-CLIENT
SPRING CLOUD CONFIG
processor
files
orders
customers
Config Server
name / profiles
{“server.port”:”8080”}
HIERARQUIA DE CONFIGURAÇÕES
APPLICATION.PROPERTIES
DEFAULT.PROPERTIES PROD.PROPERTIES
FILES-PROD.PROPERTIES
FILES-DEFAULT.PROPERTIES
FILES.PROPERTIES ORDERS.PROPERTIES
ORDERS-PROD.PROPERTIES
ORDERS-DEFAULT.PROPERTIES
SPRING CLOUD CONFIG + FEATURE TOGGLE
Config Server
Feature Toggle
feature.clients.active=true
ATUALIZAÇÃO
@Component
@ConfigurationProperties
@RefreshScope
public class RefreshProperties {
@Value("${feature.toggle.feature.helo.active}")
private boolean helloApiActive;
}
@RestController
@RequestMapping("/web")
public class WebController {
@GetMapping(value = "/hello")
public String getHello() {
if(!refreshProperties.isHelloFeatureActive()) {
throw new InactiveFeatureException("hello inactive");
}
return "Web API";
}
curl -d {} http://localhost:8090/actuator/refresh
ATUALIZAÇÕES AUTOMÁTICAS
Config Server
SPRING CLOUD STACK
Config Server
SPRING-CLOUD-STARTER-STREAM-RABBIT
SPRING-CLOUD-STARTER-BUS-AMQP
SPRING-CLOUD-STARTER-BUS-AMQP
SPRING-CLOUD-STARTER-BUS-AMQP
SPRING-CLOUD-CONFIG-MONITOR
ATUALIZAÇÕES AUTOMÁTICAS
Config Server
feature.clients.active=false
feature.clients.active=false
feature.clients.active=true
feature.clients.active=true
feature.clients.active=true
feature.clients.active=false
feature.clients.active=false
feature.clients.active=false
ATUALIZAÇÕES AUTOMÁTICAS
@GetMapping(value = "/hello")
@FeatureToggle(
enableKey = "feature.toggle.feature.hello.active",
nameKey = "feature.toggle.feature.hello.name")
public String getHello() {
return "Web API";
}
feature.toggle.feature.hello.name=Hello
feature.toggle.feature.hello.active=true
ConfigServer/application.properties
PREPARANDO
Config Server
feature.clients.active=true
feature.orders.active=truefeature.orders.active=false
FRAMEWORKS FEATURE TOGGLES
‣ FF4j
‣ Togglz
‣ …
https://github.com/emmanuelneri/fault-tolerant-features
https://emmanuelneri.com.br/2018/07/09/configuracoes-distribuidas-
com-spring-cloud-config/
EXEMPLO
OBRIGADO!
emmanuelnerisouza@gmail.com
@emmanuelnerii
www.linkedin.com/in/emmanuelnerisouza
www.emmanuelneri.com.br

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Preparando nossa aplicação para falhar com feature toggle e configurações distribuídas