NCUG 2019: Super charge your API’s with Reactive streams
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Today almost every product has an API, to integrate in other products or to made the data available to the outside world. Most API’s are using traditional patterns and technology. With the rise of Angular, React and other modern frameworks there is a need for non blocking API’s. Meet Reactive streams, like Spring Webflux, to super charge your API. In this session I will tell about and show you Reactive API’s and more
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NCUG 2019: Super charge your API’s with Reactive streams
- 1. Super charge your API’s with Reactive streams Frank van der Linden Full stack Developer elstar IT
- 2. About me • Freelance Full stack Java developer • Owner of elstar IT • Curious of new technology • IBM Champion 2013, 2014, 2017, 2018 and 2019
- 3. How to proceed • Introduction of Reactive programming • Spring Boot and Webflux • Build your first reactive API • Demo and coding
- 5. Reactive programming is programming with asynchronous data streams.
- 7. Blocking API calls • Limited amount of requests • Could cause wait time • Useful for request dependencies
- 9. Non-Blocking API calls • (Almost) no limited requests • Can process multiple requests • Not knowing when response are returned • Modern javascript frameworks rely on. (Angular, React, VueJS)
- 11. Reactive manifesto • Responsive: a reactive system needs to handle requests in a reasonable time • Resilient: a reactive system must stay responsive in the face of failures • Elastic: a reactive system must stay responsive under various loads • Message driven: components from reactive systems interacts using asynchronous message passing
- 12. Publish/Subscribe principle • Loose coupling • Scalability • Non-blocking • 4 interfaces • event bus: Apache Kafka or IBM MQ
- 13. Reactive frameworks • Node.js • RxJava • RxJS - standard used by the major frontend frameworks • Spring Webflux • Lightbend (Akka) • Vert.x
- 14. Spring Boot and Webflux
- 16. Spring boot • Open Source, coordinated by Pivotal • Java based applications • Auto configure as much as possible • Built in metrics and health checks • Very good documentation
- 17. Spring boot - component scan • @Service, @Controller, @Repository and more @Components will be scanned • @Autowired will glue everything together
- 18. Spring boot - runs everywhere • Embedded Tomcat makes it just run • Runs on Docker • Runs on Cloud Foundry, like IBM and PCF • Tomcat can excluded, then it runs on Websphere, Tomcat or WildFly • Even on Domino, http://hasselba.ch/blog/?p=2589
- 19. Spring Webflux
- 20. Spring Webflux • Part of the Spring Framework • Available since Spring 5.0 • Uses Netty as webserver instead of Tomcat • Uses the Reactor project under the hood
- 21. Spring Webflux - important objects • Mono, returns 0 or 1 object • Flux, returns 0 or N objects • WebClient, reactive version of RestTemplate
- 22. Spring Webflux - Mono example
- 23. Spring Webflux - Flux example
- 24. Spring Webflux - WebClient example
- 25. Build your first reactive API
- 26. Start your first reactive API • Install Maven or Gradle • Move to start.spring.io • Fill in all the fields and select the dependencies • Generate, download and open project in IDE • Run ‘mvn clean install’ for all the dependencies • Start coding • Run application via ‘mvn spring-boot:run’
- 28. Project structure • application.yaml => properties • pom.xml => dependencies
- 29. Application properties • port: on which the service is available • profiles: dev or prod • can used in Java classes • can also moved outside the application
- 30. Repository • Connect to MongoDb • Auto config via property • spring.data.mongodb.uri
- 31. Controller • GET • POST • DELETE • PATCH
- 32. Service • Uses WebClient • Connect to other API’s
- 33. Secure the API
- 34. Swagger the API
- 35. Router • NEW RouterFunction • Can replace the Controller • Uses a Handler class to get the data (Common scenario)
- 36. Demo Application
- 38. Demo application • Spring boot • Spring Webflux • Spring Security • MongoDb • Angular 8 (just upgraded)
- 40. Questions Asynchronous coordinated lifecycles Chai Stofkoper
- 41. Reach out to me @flinden68 https://www.elstarit.nl fl[email protected] https://nl.linkedin.com/in/flinden68 https://github.com/flinden68
- 42. Resources • Spring Initializr • http://start.spring.io/ • Spring Webflux • https://docs.spring.io/spring/docs/current/spring-framework-reference/web-reactive.html • Spring Boot • https://projects.spring.io/spring-boot/
- 43. Resources • Maven • https://maven.apache.org/ • Gradle • https://gradle.org/ • Reactive Streams Starter • https://github.com/flinden68/reactive-streams-starter