Developing Micro-Services for Cloud using Java
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This document provides an overview of developing microservices for the cloud using Java. It introduces microservices architecture and the WSO2 Microservices Framework for Java (MSF4J). It demonstrates how to develop a simple stock quote microservice using MSF4J annotations and deploy it in standalone and containerized modes. It also covers integrating microservices with Kubernetes and Docker for production deployments in the cloud. Hands-on code samples are provided to illustrate key concepts.
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Developing Micro-Services for Cloud using Java
- 1. Developing Microservices for Cloud using Java Senaka Fernando Solutions Architect, WSO2 (UK)
- 2. Agenda • Introduction to Microservices Architecture • Introduction to WSO2 MSF4J – Hands-on Sessions • Introduction to Kubernetes/Docker • Demonstrating MSF4J deployment with Kubernetes – Demos
- 4. Microservices Architecture A method of developing software applications as a suite of independently deployable, small, modular services in which each service runs a unique process and communicates through a well-defined, lightweight mechanism to serve a business goal.
- 6. Inner & Outer Architecture http://blogs.gartner.com/gary-olliffe/2015/01/30/microservices-guts-on-the-outside/
- 7. WSO2 Microservices Framework for Java (MSF4J) • Lightweight & fast runtime • Use Java annotations as a way of defining microservices APIs as well as metrics • Support well known & widely used methods such as JAX-RS annotations • Provide simple ways to develop & deploy microservices • Built-in Metrics & Analytics APIs with out-of-the-box integration with WSO2 Data Analytics Server (DAS) • To be used in the WSO2 platform as a way of replacing all admin services as well as defining other microservices for inter-component interactions
- 8. MSF4J Implementation • Based on the new WSO2 Carbon 5.0 kernel • Transport is based on Netty 4.0 • Supports streaming • High performance • Very small pack size • Starts within 300ms • ~25MB memory consumption for the framework
- 10. MSF4J Memory Consumption Comparison
- 11. Core Features of MSF4J • Quick & simple development model using simple annotations • Lightweight & high performance • Custom interceptors • OAuth based security • Metrics gathering & publishing • Streaming input & streaming output support • WSO2 DevStudio based tooling for generating microservices projects starting from a Swagger API definition • Comprehensive samples demonstrating how to develop microservices application
- 12. MSF4J Flow & Thread Model
- 13. Developer Experience & Programming Model
- 14. Development Model • Maven Archetype • IDE/Build Classpath (msf4j-all.jar) • Tooling (Swagger -> Code)
- 15. Maven pom.xml
- 17. Example - StockQuote Microservice
- 18. Application - Main Class
- 19. Build and Run !!! mvn clean install java -jar stockquote-1.0.0.jar
- 20. Tooling - WSO2 Developer Studio
- 21. Types of Deployment • Standalone, Self contained jar files • OS / Container images
- 22. Analytics & Monitoring Supports annotations • Timed – measures execution • Metered – measures rate of events • Counted – counts the total invocations • HTTPMonitored – monitors HTTP requests
- 24. Service Metrics - Console Output
- 26. Security • Security is done via a central server issuing JWT or OAuth tokens. • The OAuth2SecurityInterceptor verifies the token before accessing the resources.
- 28. Hello World! • Build the sample - wso2msf4j-dist-1.0.0/samples/ helloworld mvn clean install • Run the sample java -jar helloworld-*.jar • Test the sample curl http://localhost:8080/hello/ wso2
- 29. Fat JAR samples • Refer the sample - https://docs.wso2.com/display/ MSF4J100/Developing+a+Microservice+in +Fat+JAR+Mode
- 30. Download WSO2 Data Analytics Server • http://wso2.com/products/data- analytics-server
- 31. HTTP Monitoring with Data Analytics • Refer the sample - https://docs.wso2.com/display/ MSF4J100/Using+Metrics+and+HTTP +Monitoring+Interceptors
- 32. Simple File Server • Refer the sample - https://docs.wso2.com/display/ MSF4J100/Handling+Files
- 33. Download WSO2 Identity Server • http://wso2.com/products/identity- server
- 34. Security for Microservices • Refer the sample - https://docs.wso2.com/display/ MSF4J100/Securing+Microservices
- 35. Your First MS - Maven Build mvn archetype:generate - DarchetypeGroupId=org.wso2.msf4j - DarchetypeArtifactId=msf4j-microservice -DarchetypeVersion=1.0.0
- 36. Your First MS - Write a StudentService • API - – GET /student/getAll - get all students – GET /student/get/{id} - get student with {id} – POST /add - add a student • Intercept requests • Monitoring
- 37. Your First MS - Annotations • JAX-RS HTTP resource methods - @GET @POST @PUT @DELETE • Content-negotiation - @Produces @Consumes • Service lifecycle - @PreDestroy @PostDestroy
- 38. Production Deployment with Kubernetes and Docker
- 39. Virtual Machines vs Containers
- 40. What is Docker • Container Virtualization • Build, pack, ship and run applications as containers • Build once, run in many places • Isolated
- 43. Kubernetes • Kubernetes is an open source orchestration system for Docker containers • Docker -> Container lifecycle management • Kubernetes -> Orchestration and container cluster management “Kubernetes, I need 5 Tomcat and one MySQL server running at all times.”
- 44. Kubernetes in a Nutshell
- 45. Kubernetes UI
- 46. PetStore sample
- 47. Petstore sample
- 48. Petstore sample
- 49. Petstore sample - deployment view
- 50. CONTACT US !