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JUG - Soup to Nuts with Self Contained Systems
- 1. SELF CONTAINED SYSTEMS SOUP TO NUTS
- 2. WHO AM I ▸ DONOVAN MULLER ▸ LEAD TECHNICAL PARTNER AT BARCLAYS AFRICA/ABSA
- 3. SO(A) WHAT’S THE BIG HYPE? ▸ ISN’T THIS JUST SOA? ▸ YES BUT WITHOUT ESB, VENDORS, ORCHESTRATION ENGINES, SOAP ▸ SO, NO CENTRALISED ESB TEAM
- 4. HOW BIG IS A MICRO SERVICE ANYWAY DOES SIZE REALLY MATTER? ▸ NO, IT SHOULDN’T ▸ SIZE DOES NOT MAKE A MICROSERVICE ▸ IT’S ALL ABOUT CONTEXT…
- 5. NO DEPENDENCIES WHY DO WE NEED MICROSERVICES? ▸ IT’S ABOUT BEING INDEPENDENT/AUTONOMOUS ▸ ASKING FOR PERMISSION SUCKS ▸ WAITING SUCKS ▸ I HATE JEE ▸ I WANNA GO FAST
- 6. WE HAVE TO WAIT HOW LONG… NO HAND OFFS ▸ INTER-TEAM DEPENDENCIES WASTE TIME ▸ KEEP IT IN THE TEAM ▸ WHICH MEANS, WE NEED TO CONTROL THE STACK
- 7. I THOUGHT THIS WAS ABOUT MICROSERVICES… WHAT’S A SELF CONTAINED SYSTEM? ▸ http://scs-architecture.org ▸ Autonomous application ▸ Owned by one team ▸ Communication asynchronous where possible ▸ No shared UI ▸ No shared business code ▸ Minimal shared infrastructure
- 8. BE SELFISH SHARE NOTHING ▸ SHARING IS NOT CARING ▸ CAUSES DEPENDENCIES BETWEEN TEAMS ▸ SHARING SOME THINGS IS OK THOUGH ▸ STANDARDISED LIBRARIES FOR LOGGING ETC. ▸ TRADE OFFS
- 9. BUT… TRADE OFFS ▸ NO PERFECT DESIGN ▸ ALWAYS TRADE OFFS
- 10. DDD ▸ DOMAIN DRIVEN DESIGN ▸ MODEL THE BUSINESS PROBLEM ▸ NOT THE INFRASTRUCTURE
- 11. BOUNDED CONTEXTS ▸ MOST IMPORTANT CONCEPT? ▸ THINGS THAT BELONG TOGETHER STAY TOGETHER ▸ BOUNDED CONTEXT = SCS
- 12. AGGREGATES ▸ A GROUP OF RELATED DOMAIN OBJECTS ▸ CONSISTENCY BOUNDARY
- 13. DOMAIN EVENTS ▸ WHEN THINKING OF STATE, THINK WHAT EVENT HAS JUST TAKEN PLACE ▸ EASIER FOR PEOPLE TO MODEL WHAT SOMETHING SHOULD DO, RATHER THAN HOW TO DO IT
- 14. EVENT SOURCING ▸ STATE IS THE LEFT FOLD OF YOUR DOMAIN EVENTS ▸ KEPT IN A PERSISTENT EVENT STORE ▸ BUILT IN AUDIT RECORD ▸ TEMPORAL QUERIES
- 15. CQRS ▸ COMPLIMENTS EVENT SOURCING ▸ MATERIALISED VIEWS ▸ EASY COME, EASY GO
- 16. DEMO - AXON
- 17. FRAMEWORKS ▸ AXON WITH SPRING X ▸ LAGOM ▸ MANY MORE ▸ ROLL YOUR OWN?
- 18. PAAS - OPENSHIFT ▸ “ENTERPRISE” KUBERNETES ▸ SERVICE DISCOVERY, CONFIGURATION MANAGEMENT, ETC. FOR FREE ▸ BUILD AND RUN ▸ BUILT IN JENKINS PIPELINES
- 19. EVENT DRIVEN ARCHITECTURE ▸ ASYNCHRONOUS COMMUNICATION BETWEEN SYSTEMS ▸ LESS DEATH STAR ▸ MORE FLEXIBLE AND AUTONOMOUS ▸ TRADE OFFS
- 20. REACTIVE MANIFESTO ▸ http://www.reactivemanifesto.org/ ▸ RESPONSIVE ▸ RESILIENT ▸ ELASTIC ▸ MESSAGE DRIVEN
- 21. INTEGRATIONS (STREAMS) ▸ SPRING CLOUD STREAM/DATA FLOW ▸ ALPAKKA ▸ ETC.
- 22. WHAT ABOUT TRANSACTIONS? ▸ NO XA (BETWEEN SYSTEMS) :O ▸ EVENTUALLY CONSISTENT ▸ SAGA PATTERN
- 23. MSA FOR THE UI ▸ MICROSERVICES ARE NOT ONLY FOR THE BACKEND ▸ AVOID SHARED UI ▸ TAILOR, ESI (EDGE SIDE INCLUDES), ETC.
- 24. JUST GETTING STARTED ▸ MONITORING ▸ LOGGING ▸ SERVICE CATALOGUE ▸ API GATEWAY ▸ SECURITY