tdc 2016 - arquitetura java - spring cloud
TRANSCRIPT
Construindo Microservices com
Spring Cloud
Arquitetura Java
Claudio Eduardode Oliveira
About meClaudio Eduardo de Oliveira
Java Developer @ ADTsys
Bacharel em Ciência da Computação
Cursando MBA em Arquitetura de Soluções em Tecnologia (DeVry/Metrocamp)
Entusiasta Docker / SpringContatos:
Email: [email protected]: https://br.linkedin.com/in/claudioedoliveiraTwitter: @claudioedBlog: www.claudioliveira.com
Eat your
own
Dog Food
AgendaMotivação
Microservices
Spring Boot + Spring Cloud
Portifólio de projetos
Spring Cloud Config
Spring Cloud Eureka
Spring Cloud Bus
Spring Cloud Hystrix
Spring Cloud Zuul
Motivação
http://www.infoworld.com/article/3075880/application-development/microservice-architecture-is-agile-software-architecture.html
motivacao
The term "Microservice Architecture" has sprung up over the last few years to describe
a particular way of designing software applications as suites of independently deployable services. While there is no
precise definition of this architectural style, there are certain common characteristics around organization around business
capability, automated deployment, intelligence in the endpoints, and
decentralized control of languages and data
http://martinfowler.com/articles/microservices.html
microservices
- Desacoplamento
- Agilidade na entrega de
Valor- Deploy independente
- Diversidade tecnológica
Vantagens
http://martinfowler.com/articles/microservice-trade-offs.html
microservices
- Complexidade Operacional
- Comunicação
- Consistência Eventual
Desvantagens
http://martinfowler.com/articles/microservice-trade-offs.html
microservices
microservices
- Configurações Centralizadas
- Service Registry / Service
Discovery
- Circuit Breaker
- API Proxy
Spring Cloud Netflix OSS
+
Advice
spring boot
spring boot
- criação de aplicações standalone
spring
- NO xml
- configuração automática
- métricas e health checks
- tomcat, jetty ou undertow embed
spring bootfeatures
spring cloud
spring cloud
=
spring boot+
steroids
spring cloud
- spring cloud config- spring cloud netflix- spring cloud security
- spring cloud bus- spring cloud consul
- spring cloud sleuth
- spring cloud stream
- spring cloud zookeeper
- ...
portifólio
http://projects.spring.io/spring-cloud/
spring cloud config
- Configurações Centralizadas- Service Registry / Service
Discovery
- Circuit Breaker
- API Proxy
- HTTP resource based API
- encrypt / Decrypt
- integração Spring Boot
@EnableConfigServer
- suporte múltiplos ambiente
(dev, qa, prod)
- arquivos (github / filesystem)
spring cloud config
- spring cloud server
- spring cloud client
spring cloud config
spring cloud configConfig ServerDependência
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config-server</artifactId></dependency>
spring cloud configConfig ServerSetup/*** @author Claudio E. de Oliveira.*/@SpringCloudApplication@EnableConfigServerpublic class ConfigApplication {
public static void main(String[] args) { SpringApplication.run(ConfigApplication.class, args); } }
spring cloud configConfig ServerSetup (bootstrap.yml)spring: application: name: configserver
spring cloud config
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId></dependency>
Config ClientDependência
spring cloud configConfig ClientSetup (bootstrap.yml)spring: profiles: default application: name: predictors cloud: config: uri: http://configserver:8001/
server: port: 7003
Cloud Busspring cloud bus
- Push de configurações
- RabbitMQ
spring cloud busConfig Client BusFuncionamento
spring cloud busCloud BusDependência
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-bus-amqp</artifactId></dependency>
spring cloud busConfig Client BusSetupinfo: component: Predictor MicroService
spring: rabbitmq: host: localhost port: 5672 username: guest password: guest
spring cloud busConfig Client BusExemplo
@Service@RefreshScopepublic class ParticipantService {
@Autowired private RestTemplate restTemplate;
@Value("${services.user.info}") private String url;
}
spring cloud busConfig Client BusExemplo
services: user: info: http://USERS/ event: info: http://EVENTS/
spring cloud eureka
- Configurações Centralizadas
- Service Registry / Service
Discovery- Circuit Breaker
- API Proxy
spring cloud eurekaService DiscoveryConceito
● clientes se registram no servidor
● servidor lista os clientes● clientes conhecem são
reconhecidos por outros clientes
spring cloud eurekaService DiscoveryDesafios
● # de chamadas a microservices● configuração manual
impraticável● # de instâncias de serviços● resolver dependências em
runtime
- “lookup” de serviços
- clientes enviam heartbeats
- remoção de clientes não
funcionais
- testado em produção pelo
Netflix
spring cloud eureka
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka-server</artifactId></dependency>
spring cloud eurekaEureka ServerDependência
spring cloud eurekaEureka ServerSetup@SpringBootApplication@EnableEurekaServer@EnableDiscoveryClientpublic class DiscoveryApplication{
public static void main(String[] args) { SpringApplication.run(DiscoveryApplication.class, args); } }
spring cloud eurekaEureka ServerExemplo
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId></dependency>
spring cloud eurekaEureka ClientDependência
spring cloud eurekaEureka ClientSetup
info: component: Ranking MicroService
server: port: 7002
eureka: client: serviceUrl: defaultZone: http://discovery:8761/eureka/
spring cloud eurekaEureka ClientSetup
@SpringCloudApplicationpublic class RankingApplication {
public static void main(String[] args) throws Exception { SpringApplication.run(RankingApplication.class, args); }
}
spring cloud eurekaEureka ClientSetup@Target(ElementType.TYPE)@Retention(RetentionPolicy.RUNTIME)@Documented@Inherited@SpringBootApplication@EnableDiscoveryClient@EnableCircuitBreakerpublic @interface SpringCloudApplication {}
spring cloud hystrix
- Configurações Centralizadas
- Service Registry / Service
Discovery
- Circuit Breaker- API Proxy
Falácias da Computação Distribuída
spring cloud hystrix
1. A rede é confíavel2. A latência é zero3. A largura da banda é infinita4. A rede é segura5. A topologia não se altera6. Existe apenas um administrador7. Custo de transporte é zero8. A rede é homogênea
spring cloud hystrixCascading FailuresProblema
● # número de dependências pode levar ao “cascading failures”
● sistemas distribuídos por padrão tem mais chances de falhar
Circuit BreakerConceito
spring cloud hystrix
● Mesmo comportamento de um circuito elétrico
● “Aberto” falha na operação e a mesma não deve
ser chamada
● “Fechado” funcionamento normal, a operação
pode ser chamada
● “Parcialmente Aberto” pode haver chamada mas
serão auditadas para ver se o problema ainda
persiste
Netflix Hystrixspring cloud hystrix
● provê mecanismo de “fallback”
● “fallbacks” podem ser encadeados (cuidado!!!)
● fácil integração com Spring (via annotations)
● fechamento automático do circuito
spring cloud hystrix
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-hystrix</artifactId></dependency>
Cloud HystrixDependência
spring cloud hystrixCloud HystrixSetup
@SpringCloudApplication@EnableHystrixpublic class PredictorApplication {
public static void main(String[] args) throws Exception { SpringApplication.run(PredictorApplication.class, args); }
}
spring cloud hystrixCloud HystrixExemplo (command)
@Service@RefreshScopepublic class ParticipantService {
@HystrixCommand(fallbackMethod = "getParticipantInCache") public Participant getUserInfo(String participantId){ log.info("[REQUEST-PARTICIPANT-INFO] Request event info "); ResponseEntity<Participant> response = this.restTemplate.getForEntity(this.url + participantId, Participant.class); final Participant participant = response.getBody(); cache.put(participant.getId(),participant); return participant; }
}
spring cloud hystrixCloud HystrixExemplo (fallback)
@Service@RefreshScopepublic class ParticipantService {
public Participant getParticipantInCache(String participantId){ Participant cachedParticipant = cache.getIfPresent(participantId); if(Objects.isNull(cachedParticipant)){ log.error(String.format("[REQUEST-PARTICIPANT-INFO] CACHE - Error on retrieve participant %s information", participantId)); throw new InvalidParticipant(participantId); } return cachedParticipant;}
}
spring cloud hystrix
● microservices sem monitoramento torna-se
impraticável
● hystrix provê dashboards
● @EnableHystrixDashboard
Cloud HystrixMonitoramento
spring cloud zuul
- Configurações Centralizadas
- Service Registry / Service
Discovery
- Circuit Breaker
- API Proxy
spring cloud zuulAPI ProxyProblemas
● API internas “expostas”● segurança● CORS● Roteamento● Versionamento● Cache● # excessivo de chamadas remotas
spring cloud zuulAPI ProxySpring Cloud Zuul
● filtros (pre/pos)● roteamento para serviços● versionamento de APIs● CORS● integração Eureka (service name)
spring cloud zuul
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-zuul</artifactId></dependency>
Cloud ZuulDependência
spring cloud zuulCloud ZuulSetup
@SpringCloudApplication@Controller@EnableZuulProxypublic class GatewayApplication {
public static void main(String[] args) { SpringApplication.run(GatewayApplication.class, args); } }
spring cloud zuulCloud ZuulSetup
info: component: API Gateway (Zull Proxy)
eureka: registryFetchIntervalSeconds: 5 serviceUrl: defaultZone: http://${eureka.host:localhost}:${eureka.port:8761}/eureka/
zuul: routes: users: path: /api/v1/users/** serviceId: users
spring cloud zuulCloud ZuulExemplo (client)@SpringCloudApplication@EnableZuulProxypublic class EventApplication {
public static void main(String[] args) throws Exception { SpringApplication.run(EventApplication.class, args); }
}
#tip
email: [email protected]
linkedin: https://br.linkedin.com/in/claudioedoliveira
twitter: @claudioed
blog: www.claudioliveira.com
github: https://github.com/claudioed
Claudio Eduardo de Oliveira
Referências
http://martinfowler.com/articles/microservices.html
http://microservices.io/
http://microservices.io/patterns/apigateway.html
http://projects.spring.io/spring-boot/
https://cloud.spring.io/spring-cloud-netflix/
http://callistaenterprise.se/blogg/teknik/2015/04/10/building-microservices-with-spring-cloud-and-netflix-oss-part-1/
