A workshop covering the basics for building a restful web application with database and message queue.

1. Cloud Native Applications
for
Cloud Foundry using Spring Cloud
Workshop
Corneil du Plessis

2. About Me
• Working as Programmer since 1985
• Smallest to very large systems.
• Cobol, Fortan, Pascal, Algol, C/C++, Java, JavaScript,
Groovy, Python, Scala, Kotlin and more.
• Scientific instrumentation, Sports event
management, Mining, Banking, Treasury and
Insurance.
• Software Architect (with a preference for coding)
@corneil

3. Agenda
• Background
• Cloud Foundry command-line
• Your first Cloud Foundry application
• Connecting to database
• Connecting to message queues
• Scaling your application
• Application Discovery

4. Background
• What is Cloud Foundry?
• Application Runtime
• Container Runtime
• Who provides Cloud Foundry
Application Runtime?
• Atos
• Cloud.gov
• Fujitsu Cloud Service K5
• Huawei FusionStage
• IBM Bluemix
• Pivotal Cloud Foundry
• SAP Cloud Platform
• Suse Cloud Application Platform
• Swisscom Application Cloud
• Who uses Cloud Foundry?
• Governments
• Banks
• Insurance
• Telecomms
• Airlines
• Retail (Online)
• Retail (Bricks and mortar)
• Aerospace
https://www.cloudfoundry.org/case-studies/

5. Cloud Foundry Application Runtime

6. Terminology
• CAT
• BOSCH
• Deigo
• Services
• Application Manifest
• Organisation
• Space
• Buildpack

7. Cloud Foundry Buildpacks
• Binary
• Go
• Java
• .Net Core
• Node.js
• PHP
• Python
• Ruby
• Staticfile
• NGIX
• HWC (Hosted Web Core)
• Community
• TomEE
• WebSphere Liberty
• Jetty
• Erlang
• Haskell
• Swift

8. The 12 Factors
https://12factor.net
1. One Codebase in revision control
2. Dependencies must be explicit
3. Config in environment
4. Backing services as attached resources
5. Build, release, run as separate stages
6. One or more stateless processes
7. Export services via port binding
8. Concurrency in Process over threads
9. Disposable with quick startup and graceful shutdown.
10. Keep development/test/production in parity
11. Treat logs as event streams
12. Admin/management tasks as one-off processes

9. Cloud Foundry command-line
• cf login
• cf push
• cf marketplace
• cf create-service
• cf bind-service
• cf scale
• cf restart
• Many Plugins
• Authenticate Operator
• Deploy Application
• List services
• Create / Provision a service
• Bind service to application
• Scale application
• Restart the application

10. Visit Workshop Page
https://github.com/corneil/cf-demo

11. Your first Application

12. View Logs and Invoke

13. Connecting to Database
• Create Spring Data Repository.
• Update EventServiceImpl to use the repository.
• Add @Configuration extending AbstractCloudConfig to
provide @Bean of type DataSource.
• Add @Transactional to Controller to preserve the Stream

14. Provision PostgreSQL and Deploy

15. Connecting to Message Queues
• Create @Bean for RabbitMQ ConnectionFactory by extending
AbstractCloudConfig.
• Create @Bean for Queue.
• Implement listener method with @RabbitListener that saves
Event using repository.
• Modify createEvent to send event to message queue using
AmqpTemplate.

16. Provision RabbitMQ and Deploy

17. Scaling your application

18. Application Discovery
• @EnableDiscoveryClient
• Access resources:
• https://<target-name>/
• OpenFeign Client

19. Cloud Foundry Plugins
• Maven Push
https://github.com/fitzoh/maven-push-plugin
• Java
https://github.com/SAP/cf-cli-java-plugin
• Spring Cloud Services
https://github.com/pivotal-cf/spring-cloud-services-cli-plugin
• Spring Cloud Data Flow for PCF
https://github.com/pivotal-cf/spring-cloud-dataflow-for-pcf-cli-plugin
• Zero downtime deployments
https://github.com/bluemixgaragelondon/cf-blue-green-deploy

20. Finally
• Code: https://github.com/corneil/cf-demo
• Resources:
• https://docs.cloudfoundry.org/buildpacks/java/getting-started-deploying-apps/gsg-spring.html
• https://docs.cloudfoundry.org/buildpacks/java/configuring-service-connections/spring-service-bindings.html
• https://docs.spring.io/spring-cloud/docs/current/api/org/springframework/cloud/config/java/AbstractCloudConfig.html