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

1. Building Services with WSO2
Microservices Framework for Java and
WSO2 Application Server
Sagara Gunathunga & Sameera Jayasoma

2. 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

3. 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.

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

5. Inner & Outer Architecture
http://blogs.gartner.com/gary-olliffe/2015/01/30/microservices-guts-on-the-outside/

6. 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

7. 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

8. MSF4J Performance Comparison

9. MSF4J Memory Consumption Comparison

10. 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

11. MSF4J Flow & Thread Model

12. Developer Experience & Programming
Model

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

14. Maven pom.xml

15. 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

16. Example - StockQuote Microservice

17. Application - Main Class

18. Application - Main Class

19. Build and Run !!!
mvn clean install
java -jar stockquote-1.0.0.jar

20. Tooling - WSO2 Developer Studio

21. Tooling - WSO2 Developer Studio

22. Types of Deployment
• Standalone, Self contained jar files
• OS / Container images

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

24. Analytics & Monitoring

25. Service Metrics - Console Output

27. Security
• Security is done via a central server issuing JWT or OAuth
tokens.
• The OAuth2SecurityInterceptor verifies the token before
accessing the resources.

28. MSF4J Hands-on Sessions

29. Hello World!
1.Build the sample - wso2msf4j-dist-
1.0.0/samples/helloworld
mvn clean install
1.Run the sample
java -jar helloworld-*.jar
1.Test the sample
curl
http://localhost:8080/hello/wso2
Demo samples - https://github.com/sagara-gunathunga/msf4j-intro-webinar-samples

30. Generate a sample with Maven archetype
mvn archetype:generate -
DarchetypeGroupId=org.wso2.msf4j -
DarchetypeArtifactId=msf4j-microservice -
DarchetypeVersion=1.0.0

31. Production Deployment with
Kubernetes and Docker

32. 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!!!

33. The Essence of Micro-Services
• No shared DBs
• Transactions
• Forward Compatibility
• Micro service security
• Composition with other micro services
• Service Discovery
• Routing
• Monitoring
• Automation

34. Inner & Outer Architecture
http://blogs.gartner.com/gary-olliffe/2015/01/30/microservices-guts-on-the-outside/

35. Virtual Machines vs Containers

36. What is Docker
• Container Virtualization
• Build, pack, ship and run applications as containers
• Build once, run in many places
• Lightweight, Isolated

37. Docker File System

38. StockQuote Service Dockerfile

39. Petstore sample

40. Petstore sample

41. PetStore sample

42. 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.”

43. Kubernetes in a Nutshell

44. 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.

45. Kubernetes UI

46. Petstore sample - deployment view

47. Demo - Petstore

48. Building Services with
WSO2 Application Server

49. 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

50. Future plan for Application Server
• Upcoming release - AS 6.0
• NOT based on WSO2 Carbon or OSGi!
• Built on top of Apache Tomcat

51. AS 6.0
• HTTP Request Monitoring for Tomcat
• Seamless integration with WSO2 Identity Server for
SAML SSO Authentication
• Classloading improvements

52. Questions?

53. Thank You!
#WSO2ConEU
Share your feedback for this session
wso2con.com/app