Serverless functions with Micronaut
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The document introduces Micronaut, a framework designed for building cloud-native microservices with efficient compile-time performance and non-blocking capabilities. It discusses features like service discovery, configuration sharing, support for serverless computing, and the ability to develop functions that can be exposed as REST endpoints or invoked remotely. Additionally, it touches upon the integration with GraalVM for optimizing performance through native image generation.
Serverless functions with Micronaut
- 1. Serverless functions with Micronaut Álvaro Sánchez-Mariscal @alvaro_sanchez
- 2. About me — Coming from Madrid ! — Developer since 2001 (Java / Spring stack). — Former BEA Systems ⚰ and Sun Microsystems — Founded Salenda in 2007. Left in 2013. — Working @ OCI since 2015: Groovy, Grails & Micronaut! — Speaker at conferences like Devoxx, GeeCON, JavaLand, JavaZone, Codemotion and Spring IO. ! % & ' ( ) * + , - @alvaro_sanchez
- 3. Introducing
- 5. Introducing Micronaut The productivity of Spring Boot / Grails with a compile-time, non-blocking performance. — Designed from the ground up with microservices and the cloud in mind ("Natively Cloud Native"). — Ultra-lightweight and Reactive (based on Netty) — Integrated AOP and Compile-Time DI for Java, Groovy and Kotlin. @alvaro_sanchez
- 6. Hello, Galaxy! interface HelloApi { @Get("/hello") String hello(); } @Controller("/") class HelloServer implements HelloApi { @Get("/hello") public String hello() { return "Hello, Galaxy!"; } } @Client("/") // Client Generated at Compile Time interface HelloClient extends HelloApi {} @alvaro_sanchez
- 7. Hello, Galaxy! @MicronautTest class ApplicationTest { @Inject HelloClient helloClient; @Test void testHello() { Assertions.assertEquals("Hello, Galaxy!", helloClient.hello()); } } @alvaro_sanchez
- 8. Natively Cloud Native — Service Discovery - Consul, Eureka, Route 53 and Kubernetes. — Configuration Sharing - Consul Supported and Amazon ParameterStore planned. — Client Side Load Balancing - Integrated or Netflix Ribbon Supported — Distributed tracing - Zipkin or Jaeger. — Support for Serverless Computing; AWS Lambda, @alvaro_sanchez
- 9. Ge!ing started $ curl -s "https://get.sdkman.io" | bash $ sdk install micronaut $ mn create-function uppercase | Generating Java project... | Function created at /tmp/uppercase @alvaro_sanchez
- 10. Ge!ing started: @FunctionBean import io.micronaut.function.FunctionBean; import java.util.function.Function; @FunctionBean("isbn-validator") public class IsbnValidatorFunction implements Function<IsbnValidationRequest, IsbnValidationResponse> { @Override public IsbnValidationResponse apply(IsbnValidationRequest request) { return new IsbnValidationResponse(); //do stuff } } @alvaro_sanchez
- 11. Ge!ing started: @FunctionBean — Use Java 8's java.util.function.*: — Supplier<O>: no arguments, single result. — Consumer<I>: single argument, no result. — BiConsumer<I, J>: two arguments, no result. — Function<I, O>: single argument, single result. — Function<I, J, O>: two arguments, single result. @alvaro_sanchez
- 12. Ge!ing started: @Factory @Factory public class WordFunctions { @FunctionBean("uppercase") public Function<String, String> uppercase() { return String::toUpperCase; } @FunctionBean("lowercase") public Function<String, String> lowercase() { return String::toLowerCase; } } @alvaro_sanchez
- 13. Ge!ing started: Groovy //src/main/groovy/com/acme/HelloFunction.groovy import groovy.transform.Field import javax.inject.Inject @Field @Inject HelloService helloService String hello(String name) { helloService.hello(name) } @alvaro_sanchez
- 14. Testing functions — Micronaut can expose functions as local REST endpoints. — @FunctionClient can be leveraged in tests: @FunctionClient public interface IsbnValidatorClient { @Named("isbn-validator") @Retryable(attempts = "5", delay = "5s") Single<IsbnValidationResponse> validate(@Body IsbnValidationRequest req); } @alvaro_sanchez
- 15. Invoking remote functions — The same @FunctionClient can invoke remote functions: # src/main/resources/application.yml aws: lambda: functions: slack: functionName: slack-message region: eu-west-1 @alvaro_sanchez
- 16. Functions as CLI applications — The build is configured to produce runnable JARs: $ echo '{value: 3}' | java -jar build/libs/math-function-0.1-all.jar — This allows functions written with Micronaut to be deployed to platforms that process standard input/ output, such as OpenFaaS. @alvaro_sanchez
- 17. GraalVM — New Polyglot VM from Oracle. — Runs JS, Java, Ruby, R etc. — Ability to turn Java code into native images. — Can run Micronaut applications and functions blazingly fast! @alvaro_sanchez
- 18. Demo
- 20. Q & A Álvaro Sánchez-Mariscal @alvaro_sanchez