GUJavaSC - Criando Micro-serviços Reativos com Java
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Serviços reativos foram definidos pelo Manifesto Reativo. Eles são desenvolvidos para serem mais flexíveis, fracamente acoplados, escaláveis e também qualificados a partir dos quatro princípios: responsivo, resiliente, elástico e direcionados a mensagens. A plataforma Java e Java EE oferecem uma ótima estrutura e bibliotecas para implementarem serviços reativos e transformá-los em uma arquitetura de micro-serviços resiliente.
![Project Reactor
• Biblioteca para implementação de non-blocking apps
• Interage com Java 8 functional API
• Oferece duas composable API reativas
• Flux[N] and Mono[0|1]
• Suporta escalabilidade in-memory roteando com
Bus extensions
• Suporte portável para micro-serviços](https://image.slidesharecdn.com/gujavasc-criandomicro-servicosreativoscomjava-161011143522/85/GUJavaSC-Criando-Micro-servicos-Reativos-com-Java-20-320.jpg)
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GUJavaSC - Criando Micro-serviços Reativos com Java
- 1. Criando Micro-serviços Reativos com Java Rodrigo Cândido da Silva @rcandidosilva
- 2. About Me • Software Architect • http://integritastech.com • JUG Leader do GUJavaSC • http://gujavasc.org • Twitter • @rcandidosilva • Contatos • http://rodrigocandido.me
- 3. Agenda • Monolito vs. Micro-serviços • Manifesto Reativo • Resiliência • Message-driven • Demo • Perguntas
- 5. Micro-serviços • Pequenos • Deployment interdependente • Independente de tecnologia • Infra-estrutura separada "Small independent component with well- defined boundaries that’s doing one thing, but doing it well"
- 7. Resiliência • Como suportar isso com micro-serviços? • Central point of configuration • Service registry and discovery • Routing features • Load balancing • Failover • Monitoring
- 8. Spring BootSpring Cloud Spring Cloud + Netflix OSS
- 9. Spring Cloud + Netflix OSS “Casamento perfeito para criação de micro- serviços resilientes“ Gerenciamento de Configuração Spring Cloud Config + Bus Descoberta de Serviços Netflix Eureka Balanceamento de Carga Netflix Ribbon Circuit Breaker Netflix Hystrix + Turbine Proxy Server Netflix Zuul Segurança Spring Cloud Security
- 11. Netflix Eureka
- 12. Netflix Ribbon
- 13. Netflix Hystrix • Circuit Breaker Pattern
- 15. Netflix Zuul
- 16. Spring Cloud Security Discovery Client Relying Party Resource Server Get an access token & an ID Token (JWT) Use an access token Authorization Server Iden.ty Provider or IDP or OpenID Provider or OP Authorization Endpoint Token Endpoint Important Stuff Userinfo Endpoint Registration Endpoint JWKS Endpoint JWKS Endpoint Validate (JWT) ID Token /.well-known /webfinger /openid-configura.on Check Session IFrame End Session Endpoint
- 17. Message-Driven • Como suportar isso com micro-serviços? • Comunicação assíncrona • Non blocking I/O • Distribuição • Consistência • Event sourcing • CQRS
- 18. Reactive Programming • Asynchronous communication and data streams • reactive-streams.org
- 19. Alternativas Reativas com Java EE JMS EJB 3 Message-Driven Beans Asynchronous Session Beans CDI Events Observers Servlet Asynchronous NIO JAX-RS Async on Server Async on Client WebSocket Async Remote Endpoints Concurrency Utilities
- 20. Project Reactor • Biblioteca para implementação de non-blocking apps • Interage com Java 8 functional API • Oferece duas composable API reativas • Flux[N] and Mono[0|1] • Suporta escalabilidade in-memory roteando com Bus extensions • Suporte portável para micro-serviços
- 21. REST Endpoint @RestController public class UserRestController { private static final List<User> users = new ArrayList<>(); static { users.add(new User(1, "Rodrigo", "C", "da Silva")); users.add(new User(2, "Israel", "B", "Rodriguez")); users.add(new User(3, "Bruno", "", "Souza")); users.add(new User(4, "Edson", "", "Yanaga")); } @RequestMapping(method = RequestMethod.GET, value = "/users") public List<User> getUsers() { return users; } @RequestMapping(method = RequestMethod.GET, value = "/user/{id}") public User getUser(@PathVariable("id") Integer id) { return users.stream().filter(g -> g.getId() == id) .collect(Collectors.toList()).get(0); } }
- 22. REST Proxy @Component public class UserServiceProxy { @Autowired UserService service; @HystrixCommand(fallbackMethod = "defaultUsersObservable") public Observable<List<User>> getUsersObservable() { return new ObservableResult<List<User>>() { @Override public List<User> invoke() { return service.getUsers(); } }; } public Observable<User> defaultUsersObservable() { return null; } } @FeignClient("USER-SERVICE") public interface UserService { @RequestMapping(value = "/users", method = RequestMethod.GET) List<User> getUsers(); @RequestMapping(value = "/user/{id}", method = RequestMethod.GET) User getUser(@PathVariable("id") Integer id); }
- 23. REST Async Client @RestController public class APIController { @Autowired GroupServiceProxy groupService; @Autowired UserServiceProxy userService; @RequestMapping(method = RequestMethod.GET, value = "/userGroups") public UserGroup getUserGroups() { Observable<List<Group>> groups = groupService.getGroupsObservable(); Observable<List<User>> users = userService.getUsersObservable(); Observable<UserGroup> userGroupObservable = Observable.zip(groups, users, (g, u) -> new UserGroup(u, g)); return userGroupObservable.toList().toBlocking().single().get(0); } }
- 24. Demo • Reactive Microservices • https://github.com/rcandidosilva/reactive-microservices
- 26. Perguntas ?
- 27. Referências • http://projects.spring.io/spring-boot/ • http://projects.spring.io/spring-cloud/ • https://netflix.github.io/ • http://www.reactive-streams.org/ • http://www.reactivemanifesto.org/ • https://github.com/reactivemanifesto/website-manifesto/tree/master/public/pdf • https://projectreactor.io/ • http://reactivex.io/ • http://www.kennybastani.com/2016/04/event-sourcing-microservices-spring- cloud.html