building services with wso2 application server and wso2 microservices framework for java
TRANSCRIPT
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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