Building Services with WSO2 Microservices Framework for Java and WSO2 Application Server

Sagara Gunathunga & Sameera Jayasoma

Agenda

• Introduction to Microservices Architecture• Introduction to WSO2 MSF4J

– Hands-on Sessions• Introduction to Kubernetes/Docker• Demonstrating MSF4J deployment with Kubernetes

• Introduction to WSO2 Application Server– Hands-on Session

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.

Microservices

http://martinfowler.com/articles/microservices.html

Inner & Outer Architecture

http://blogs.gartner.com/gary-olliffe/2015/01/30/microservices-guts-on-the-outside/

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

MSF4J Implementation

• Based on the new WSO2 Carbon 5.0 kernel • Transport is based on Netty 4.0• Supports streaming• High performance• 5MB pack size• Starts within 300ms• ~25MB memory consumption for the framework

MSF4J Performance Comparison

MSF4J Memory Consumption Comparison

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

MSF4J Flow & Thread Model

Developer Experience & Programming Model

Development Model

• Maven Archetype• IDE/Build Classpath (msf4j-all.jar)• Tooling (Swagger -> Code)

Maven pom.xml

Maven Archetype

mvn archetype:generate-DarchetypeGroupId=org.wso2.msf4j-DarchetypeArtifactId=msf4j-microservice-DarchetypeVersion=1.0.0-DgroupId=org.example -DartifactId=myservice-Dversion=1.0.0-SNAPSHOT-Dpackage=org.example.service

Example - StockQuote Microservice

Application - Main Class

Application - Main Class

Build and Run !!!

mvn clean install

java -jar stockquote-1.0.0.jar

Tooling - WSO2 Developer Studio

Tooling - WSO2 Developer Studio

Types of Deployment

• Standalone, Self contained jar files• OS / Container images

Analytics & Monitoring

Supports annotations• Timed – measures execution • Metered – measures rate of events • Counted – counts the total invocations • HTTPMonitored – monitors HTTP requests

Analytics & Monitoring

Service Metrics - Console Output

Security

• Security is done via a central server issuing JWT or OAuth tokens.

• The OAuth2SecurityInterceptor verifies the token before accessing the resources.

MSF4J Hands-on Sessions

Hello World!

1.Build the sample - wso2msf4j-dist-1.0.0/samples/helloworld

mvn clean install2.Run the sample

java -jar helloworld-*.jar3.Test the sample

curl http://localhost:8080/hello/wso2

Demo samples - https://github.com/sagara-gunathunga/msf4j-intro-webinar-samples

Generate a sample with Maven archetype

mvn archetype:generate -DarchetypeGroupId=org.wso2.msf4j -DarchetypeArtifactId=msf4j-microservice -DarchetypeVersion=1.0.0

Production Deployment with Kubernetes and Docker

The Essence of Micro-Services• Micro-Services are all about…

– Proper granularity of components – Independent deployment

• They are not a counter-proposal to SOA • They do not prove that SOA failed

– In the opposite: they require loose coupling,...• They require a methodology to determine “proper granules”

for components– Something like the holy grail of software engineering for

decades!– So, don’t expect your middleware vendors to solve this problem

for you! It’s all about YOU solving an very difficult architecture/design problem!!!

The Essence of Micro-Services

• No shared DBs• Transactions• Forward Compatibility• Micro service security• Composition with other micro services• Service Discovery• Routing• Monitoring• Automation

Inner & Outer Architecture

http://blogs.gartner.com/gary-olliffe/2015/01/30/microservices-guts-on-the-outside/

Virtual Machines vs Containers

What is Docker

• Container Virtualization• Build, pack, ship and run applications as containers• Build once, run in many places• Lightweight, Isolated

Docker File System

StockQuote Service Dockerfile

Petstore sample

Petstore sample

PetStore sample

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.”

Kubernetes in a Nutshell

Kubernetes Work Units• Pods - Generally represents one or more containers that

should be controlled as a single “application".

• Services - A unit that act as a basic load balancer for other containers.

• Replication Controllers - Concept of a replicated pod. Handles horizontal scaling of containers / pods. Maintain the desired number of containers.

Kubernetes UI

Petstore sample - deployment view

Demo - Petstore

Building Services with WSO2 Application Server

Current status of Application Server

• Latest release - AS 5.3.0• Built on top of WSO2 Carbon• Embedded Apache Tomcat 7 and Apache TomEE 7• First class support for

– JAX-WS and JAX-RS services– JavaEE 6 Web Profile applications

Future plan for Application Server

• Upcoming release - AS 6.0• NOT based on WSO2 Carbon or OSGi!• Built on top of Apache Tomcat

AS 6.0

• HTTP Request Monitoring for Tomcat• Seamless integration with WSO2 Identity Server for SAML

SSO Authentication • Classloading improvements

Questions?

Thank You!

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