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Cqrs, Event Sourcing

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Ashic Mahtab
Ashic Mahtab

Slides from my CQRS talk at DDD Belfast

TechnologyBusiness
1 of 12
CQRS, Event Sourcing Simplicity / Complexity AshicMahtabhttp://www.heartysoft.com@ashic
UI DB Schema Validation DTO Transformation Controller DTO Transformation Service Repository “Domain” IoC Containers Projection Caching Lazy Loading Leaky “Pointless” Abstractions
Simple, right?
I Hold Data(Just the way you want it) I Did Stuff Gimme Some Data I Do Stuff Please Do Stuff Application
ReadModel I Did Stuff Gimme Some Data Domain Please Do Stuff Application
Event Bus I Hold Data(Just the way you want it) Domain I Did Stuff Gimme Some Data Read Model I Do Stuff Please Do Stuff Application Command Service
Testing When_doing_tranche_payment_with… What about changes? Does “refactoring” require you to change tests? That’s not refactoring. Is the “BDD” output really human readable?
Testing with Events Given:-An account with account holder named “John”, account id=1243, account type=Silver-Account 1243 is debited £200 When a request is made to withdraw £300 from account 1243 The request should fail stating “Account limit will be exceeded” as the reason. [pass]
Adding new features to existing application
Performance
Resources www.cqrsinfo.com Jonathan Oliver’s blog RinatAbdullin’s blog Ncqrs (github) Google groups for CQRS / DDDD and Ncqrs

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Cqrs, Event Sourcing

  • 1. CQRS, Event Sourcing Simplicity / Complexity AshicMahtabhttp://www.heartysoft.com@ashic
  • 2.
  • 3. UI DB Schema Validation DTO Transformation Controller DTO Transformation Service Repository “Domain” IoC Containers Projection Caching Lazy Loading Leaky “Pointless” Abstractions
  • 5. I Hold Data(Just the way you want it) I Did Stuff Gimme Some Data I Do Stuff Please Do Stuff Application
  • 6. ReadModel I Did Stuff Gimme Some Data Domain Please Do Stuff Application
  • 7. Event Bus I Hold Data(Just the way you want it) Domain I Did Stuff Gimme Some Data Read Model I Do Stuff Please Do Stuff Application Command Service
  • 8. Testing When_doing_tranche_payment_with… What about changes? Does “refactoring” require you to change tests? That’s not refactoring. Is the “BDD” output really human readable?
  • 9. Testing with Events Given:-An account with account holder named “John”, account id=1243, account type=Silver-Account 1243 is debited £200 When a request is made to withdraw £300 from account 1243 The request should fail stating “Account limit will be exceeded” as the reason. [pass]
  • 10. Adding new features to existing application
  • 12. Resources www.cqrsinfo.com Jonathan Oliver’s blog RinatAbdullin’s blog Ncqrs (github) Google groups for CQRS / DDDD and Ncqrs