Serverless Spring - Dave Syer
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The document discusses serverless computing and Spring Cloud Function. It describes serverless as being event-driven and allowing dynamic resource utilization and billing per message. Spring Cloud Function allows developing serverless applications using Spring and treating functions as regular Spring beans, while providing adapters for various serverless platforms. It also discusses using Project Reactor to develop reactive serverless functions in Spring.
![Spring Cloud Function
@SpringBootApplication
public class Application {
@Bean
public Function<String, String> uppercase() {
return value -> value.toUpperCase();
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
Serverless Spring http://localhost:4000/decks/serverless-spring.html
19 of 30 30/01/2019, 10:04](https://image.slidesharecdn.com/syer-clt-serverless-spring-190130163626/85/Serverless-Spring-Dave-Syer-19-320.jpg)
![Spring Cloud Function
@SpringBootApplication
public class Application {
@Bean
public Function<Flux<String>, Flux<String>> uppercase() {
return flux -> flux
.filter(this::isNotRude)
.map(String::toUpperCase);
}
boolean isNotRude(String word) {
...
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
Serverless Spring http://localhost:4000/decks/serverless-spring.html
24 of 30 30/01/2019, 10:04](https://image.slidesharecdn.com/syer-clt-serverless-spring-190130163626/85/Serverless-Spring-Dave-Syer-24-320.jpg)
Serverless Spring - Dave Syer
- 1. Serverless Spring@david_syer, 2018 Serverless Spring http://localhost:4000/decks/serverless-spring.html 1 of 30 30/01/2019, 10:04
- 2. Agenda Serverless and functions Servless platforms, including Riff Spring Cloud Function http://github.com/spring-cloud/spring-cloud-function http://projectreactor.io/ Serverless Spring http://localhost:4000/decks/serverless-spring.html 2 of 30 30/01/2019, 10:04
- 3. Serverless Event driven Dynamic resource utilization, "scale to zero" Billing per message Focus on business logic Easy integration with platform services Serverless Spring http://localhost:4000/decks/serverless-spring.html 3 of 30 30/01/2019, 10:04
- 4. Serverless Use Cases Web hooks Background jobs Glue code (hands-free integration) CNCF WG Whitepaper Serverless Spring http://localhost:4000/decks/serverless-spring.html 4 of 30 30/01/2019, 10:04
- 5. No Code is an Island Credit: Yan Cui, https://theburningmonk.com Serverless Spring http://localhost:4000/decks/serverless-spring.html 5 of 30 30/01/2019, 10:04
- 6. Service Block Serverless Spring http://localhost:4000/decks/serverless-spring.html 6 of 30 30/01/2019, 10:04
- 7. Amazon Lambda Serverless Spring http://localhost:4000/decks/serverless-spring.html 7 of 30 30/01/2019, 10:04
- 8. Serverless Spring http://localhost:4000/decks/serverless-spring.html 8 of 30 30/01/2019, 10:04
- 9. Google Cloud Function Serverless Spring http://localhost:4000/decks/serverless-spring.html 9 of 30 30/01/2019, 10:04
- 10. Serverless Spring http://localhost:4000/decks/serverless-spring.html 10 of 30 30/01/2019, 10:04
- 11. Microsoft Azure Functions Serverless Spring http://localhost:4000/decks/serverless-spring.html 11 of 30 30/01/2019, 10:04
- 12. Serverless Spring http://localhost:4000/decks/serverless-spring.html 12 of 30 30/01/2019, 10:04
- 13. Alibaba Function Compute Serverless Spring http://localhost:4000/decks/serverless-spring.html 13 of 30 30/01/2019, 10:04
- 14. Serverless Spring http://localhost:4000/decks/serverless-spring.html 14 of 30 30/01/2019, 10:04
- 15. Riff Serverless Spring http://localhost:4000/decks/serverless-spring.html 15 of 30 30/01/2019, 10:04
- 16. Serverless Spring http://localhost:4000/decks/serverless-spring.html 16 of 30 30/01/2019, 10:04
- 17. Serverless Providers (J) Amazon Lambda Google Cloud Functions (J) Azure Function (J) Alibaba (J) Riff https://projectriff.io and PFS (J) IBM OpenWhisk (J) Oracle Fn OpenFaaS Fission Kubeless … (J) = native Java support Others can run Java, e.g. via custom container or node JRE launcher. Serverless Spring http://localhost:4000/decks/serverless-spring.html 17 of 30 30/01/2019, 10:04
- 18. Java Util Function public interface Function<T, R> { R apply(T t); } public interface Consumer<T> { void accept(T t); } public interface Supplier<T> { T get(); } Serverless Spring http://localhost:4000/decks/serverless-spring.html 18 of 30 30/01/2019, 10:04
- 19. Spring Cloud Function @SpringBootApplication public class Application { @Bean public Function<String, String> uppercase() { return value -> value.toUpperCase(); } public static void main(String[] args) { SpringApplication.run(Application.class, args); } } Serverless Spring http://localhost:4000/decks/serverless-spring.html 19 of 30 30/01/2019, 10:04
- 20. Plain Old Functions package functions; public class Uppercase implements Function<String, String> { String apply(String input) { return input.toUpperCase(); } } Serverless Spring http://localhost:4000/decks/serverless-spring.html 20 of 30 30/01/2019, 10:04
- 21. AWS Cold Starts Lambda throttles CPU resources when memory is constrained … also billing is proportional to memory usage … it’s not that simple Serverless Spring http://localhost:4000/decks/serverless-spring.html 21 of 30 30/01/2019, 10:04
- 22. Spring Cloud Function All the benefits of serverless, but with full access to Spring (dependency injection, integrations, autoconfiguration) and build tools (testing, continuous delivery, run locally) For Spring devs: a smaller, more familiar step than using FaaS APIs and UIs natively For Functionistas: no need to know anything about Spring Decouple lifecycle of business logic from runtime platform. Run the same code as a web endpoint, a stream processor, or a task Uniform programming model across serverless providers, and also able to run standalone (locally or in a PaaS) Serverless Spring http://localhost:4000/decks/serverless-spring.html 22 of 30 30/01/2019, 10:04
- 23. Project Reactor public abstract class Flux<T> implements Publisher<T> { ... } public abstract class Mono<T> implements Publisher<T> { ... } Serverless Spring http://localhost:4000/decks/serverless-spring.html 23 of 30 30/01/2019, 10:04
- 24. Spring Cloud Function @SpringBootApplication public class Application { @Bean public Function<Flux<String>, Flux<String>> uppercase() { return flux -> flux .filter(this::isNotRude) .map(String::toUpperCase); } boolean isNotRude(String word) { ... } public static void main(String[] args) { SpringApplication.run(Application.class, args); } } Serverless Spring http://localhost:4000/decks/serverless-spring.html 24 of 30 30/01/2019, 10:04
- 25. Spring Cloud Function Adapter Serverless Spring http://localhost:4000/decks/serverless-spring.html 25 of 30 30/01/2019, 10:04
- 26. Serverless Spring http://localhost:4000/decks/serverless-spring.html 26 of 30 30/01/2019, 10:04
- 27. Spring Cloud Function Programming model: @Beans of type Function, Consumer and Supplier, with Flux, Mono, Publisher 1. Component scan for functions (e.g. execute jar with no dependency on Spring at all)2. Compile strings which are Java function bodies3. Bind and invoke from an isolated classloader (JVM packing, platform)4. Adapters for Spring MVC, Spring Cloud Stream, AWS Lambda, Azure, Riff and other "serverless" service providers 5. Serverless Spring http://localhost:4000/decks/serverless-spring.html 27 of 30 30/01/2019, 10:04
- 28. Learnings Spring is not slow or "heavy" on its own, classes loaded is important1. AWS Lambda containers are slow, Azure even more so2. Functional bean definitions rule for fast startup3. Functions are glue code anyway - not latency sensitive4. Scale to Zero5. Platform services and integration spaghetti6. Serverless Spring http://localhost:4000/decks/serverless-spring.html 28 of 30 30/01/2019, 10:04
- 29. Links Spring Cloud Function: https://github.com/spring-cloud/spring-cloud-function Riff: https://github.com/projectriff/riff Spring Boot Thin Launcher: https://github.com/dsyer/spring-boot-thin-launcher Spring Initializr: http://start.spring.io Spring Cloud: http://cloud.spring.io Reactor: http://projectreactor.io Serverless Spring http://localhost:4000/decks/serverless-spring.html 29 of 30 30/01/2019, 10:04
- 30. ← → 1 / 23 Go to Slide: Go Serverless Spring http://localhost:4000/decks/serverless-spring.html 30 of 30 30/01/2019, 10:04