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Event driven microservices with axon and spring boot-excitingly boring
- 1. @allardbz Allard Buijze @allardbz Event-Driven Microservices withAxon and Spring Boot Excitingly boring!
- 2. @allardbz > java –jarmy_awesome_app.jar Hello world! > _ > _
- 3. @allardbz Production is noplace for excitement!
- 4. @allardbz “Universal ‘BBC’ architecture” BoxBox Cylinder Source: Ted Neward
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- 7. @allardbz Number of deploymentunits Modularity “Evil anti-modularity forces”
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- 9. @allardbz Location transparency A Componentshould not be aware, nor make any assumptions, of the location of Components it interacts with A component should neither be aware of nor make any assumptions about the location of components it interacts with. Location transparency starts with good API design (but doesn’t end there)
- 10. @allardbz Microservices Messaging Commands EventsQueries Route to single handler Use consistent hashing Provides confirmation/result Distribute to all logical handlers Consumers express ordering req’s No results Route with load balancing Sometimes scatter/gather Provides result "Event" and “Message" is not the same thing
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- 12. @allardbz Command Query Responsibility Segregation Command model Projections Client Events Complex Deployedoften Simple Rarely depoyed Seasonal usage peaks Unstable, memory aggressive
- 13. @allardbz Accidental complexity Useful forqueries. Not for making decisions!
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- 15. @allardbz Events… • How dowe guarantee atomic publication of events and state change commits? • How do we guarantee that our events are a truthful representation of an entity’s history
- 16. @allardbz Event Sourcing: the truth, thewhole truth, nothing but the truth
- 17. @allardbz State storage EventSourcing Event Sourcing • OrderCreated (id: 123) • ItemAdded (2x Deluxe Chair, €399) • ItemRemoved (1x Deluxe Chair, €399) • OrderConfirmed • OrderShipped • OrderCancelledByUser • ReturnShipmentReceived • id: 123 • items – 1x Deluxe Chair - € 399 • status: return shipment rcvd
- 18. @allardbz The value ofEvent Sourcing • Audit trail • Analytics • Improve modeling • Given-when-testing • …
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- 24. @allardbz Streaming to theUI User Interface Event Handler BikeRentedEventBikeRentedEvent { bikeId: 1324, location: Barcelona, renter: } Steven
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- 35. @allardbz Try it yourself •Sources: • https://github.com/abuijze/bike-rental-demo (‘springio’ branch) • https://github.com/AxonFramework/AxonFramework • Download Axon • axoniq.io/download (includes quick-start-guide)
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