![APP CODE
package hello;
import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.stereotype.*;
import org.springframework.web.bind.annotation.*;
@Controller
@EnableAutoConfiguration
public class SampleController {
@RequestMapping("/")
@ResponseBody
String home() {
return "Hello World!";
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleController.class, args);
... the beauty of autoconfiguration](https://image.slidesharecdn.com/spring-boot-and-microservices-141031024942-conversion-gate02/85/Spring-Boot-and-Microservices-14-320.jpg)
Spring Boot and Microservices
- 1. SPRING BOOT & MICROSERVICES @ladislavGazo [email protected]
- 3. huge application servers monolithic architecture long restarts no save-reload cycle wired to a set of dependencies
- 8. PROS Each microservice is relatively small Easier for a developer to understand The IDE is faster making developers more productive The web container starts faster Easier to scale development. Each team can develop, deploy and scale their service independently of all of the other teams.
- 9. PROS 2 Improved fault isolation In comparison, one misbehaving component of a monolithic architecture can bring down the entire system. Each service can be developed and deployed independently Eliminates any long-term commitment to a technology stack
- 10. BUT... (there is always at least one...) Developers must deal with the additional complexity of creating a distributed system testing transactions use-cases span multiple microservices Deployment complexity In production Increased memory consumption
- 11. ... TACKLE WITH when to split to multiple microservices what should be inside one microservice single responsibility principle ... it is the art
- 12. SPRING BOOT http://projects.spring.io/spring-boot/ opinionated way how to do modern applications
- 13. VERY EASY TO START <parent> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-parent</artifactid> <version>1.1.8.RELEASE</version> </parent> <dependencies> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid> </dependency> </dependencies> ta-daaaa .... web app built :)
- 14. APP CODE package hello; import org.springframework.boot.*; import org.springframework.boot.autoconfigure.*; import org.springframework.stereotype.*; import org.springframework.web.bind.annotation.*; @Controller @EnableAutoConfiguration public class SampleController { @RequestMapping("/") @ResponseBody String home() { return "Hello World!"; } public static void main(String[] args) throws Exception { SpringApplication.run(SampleController.class, args); ... the beauty of autoconfiguration
- 16. 3 OPTIONS JRebel jHipster Reloader Spring Loaded
- 17. JHIPSTER RELOADER -javaagent:/home/user/.m2/repository/io/github/jhipster/loaded/agent/0.12/agent-0.12.jar <profiles> <profile> <id>reloaded</id> <dependencies> <dependency> <groupId>io.github.jhipster.loaded</groupId> <artifactId>agent</artifactId> <version>0.12</version> <exclusions> <exclusion> <groupId>org.springframework</groupId> <artifactId>springloaded</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>springloaded</artifactId> </dependency> </dependencies> </profile> </profiles>
- 18. INTERESTING DEPENDENCIES benefit of Spring Boot MVC data access templating security ... ... anything from the Spring stack
- 19. REST @RestController based on Spring MVC
- 20. TEMPLATING <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> using Thymeleaf
- 21. SPRING SECURITY <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> @EnableWebMvcSecurity @EnableGlobalMethodSecurity http.authorizeRequests().antMatchers("/identity/login", "/page/**", "/client/**", "/user/**" http.csrf().disable(); http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS); http.addFilterBefore(new AuthenticationTokenFilter(identityService), AnonymousAuthenticationFilter http.exceptionHandling().authenticationEntryPoint(new UnauthorizedEntryPoint());
- 22. MIGRATIONS <dependency> <groupId>org.flywaydb</groupId> <artifactId>flyway-core</artifactId> </dependency> migration files V1.1__init.sql V1.2__data.sql ...
- 23. DATA ACCESS <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> </dependency> <dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> </dependency> autodetection of the driver
- 24. DATA ACCESS II. spring.datasource.url: jdbc:postgresql://localhost/mydb spring.datasource.username: myuser spring.datasource.password: mypass spring.datasource.driverClassName: org.postgresql.Driver <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency>
- 25. CONFIGURATION driven mainly by: Spring Java Configuration Spring Annotations Spring Profiles simple YAML / properties file
- 26. CHERRY @Component @ConfigurationProperties(prefix="connection") public class ConnectionSettings { private String username; private InetAddress remoteAddress; // ... getters and setters } # application.yml connection: username: admin remoteAddress: 192.168.1.1
- 27. KONTANJERE
- 28. SKALA
- 29. GITER8 TEMPLATE https://github.com/lgazo/scala-boot.g8 curl https://raw.githubusercontent.com/n8han/conscript/master/setup.sh | sh # add to your path ~/bin cs n8han/giter8 g8 lgazo/scala-boot
- 31. THANK YOU... FOR... ATTENTION