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All our aggregates are wrong (ExploreDDD 2018)

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Mauro Servienti
Mauro Servienti

It always starts well. At first glance the requirements seem straightforward, and implementation proceeds without hiccups. Then the requirements start to get more complex, and you find yourself in a predicament, introducing technical shortcuts that smell for the sake of delivering the new feature on schedule. In this talk, we'll analyze what appears to be a straightforward e-commerce shopping cart. We'll then go ahead and add a few more use-cases that make it more complex and see how it can negatively impact the overall design. Finally, we'll focus our attention to the business needs of these requirements and see how it can shed light on the correct approach to designing the feature. Walk away with a new understanding on how to take requirements apart to build the right software.

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@mauroservienti | #EDDD all our aggregates are wrong Mauro Servienti @mauroservienti
@mauroservienti | #EDDD All I wanna do when I wake up in the morning is… Rosanna, Toto. Toto IV
@mauroservienti | #EDDD Buy a "Banana Protector"
@mauroservienti | #EDDD Buy a "Banana Protector"
@mauroservienti | #EDDD Sounds like a nice looking aggregate [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart
@mauroservienti | #EDDD It even has behaviors
@mauroservienti | #EDDD please, welcome the business
@mauroservienti | #EDDD Business requirements (#1)
@mauroservienti | #EDDD Straightforward, isn’t it? [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart - Item ID - Price Sales
@mauroservienti | #EDDD Straightforward, isn’t it? [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart - Item ID - Price Sales copy
@mauroservienti | #EDDD Business requirements (#2)
@mauroservienti | #EDDD Still not a big deal… - Item ID - Price Sales [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart copy - Item ID - Inventory Warehouse copy
@mauroservienti | #EDDD - Item ID - Price Sales [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart - Item ID - Inventory Warehouse However, availability changes over time Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory copy
@mauroservienti | #EDDD Business requirements (#3)
@mauroservienti | #EDDD - Item ID - Inventory Warehouse …uhm… Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart
@mauroservienti | #EDDD - Item ID - Inventory Warehouse …uhm… Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales [ list-of ] - Item ID - Price - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart
@mauroservienti | #EDDD - Item ID - Inventory Warehouse …uhm… Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales [ list-of ] - Item ID - Price - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart Is item XYZ in a cart? Swap & Insert Prices
@mauroservienti | #EDDD - Item ID - Inventory Warehouse …uhm… Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales [ list-of ] - Item ID - Price - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart Is item XYZ in a cart? Swap & Insert Prices Move to Saved for…
@mauroservienti | #EDDD - Item ID - Inventory Warehouse It’s becoming messy, isn’t it? - Item ID - Price Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Swap & Insert Prices Move to Saved for… Is item XYZ in a cart? Swap & Insert Prices Move to Saved for…
@mauroservienti | #EDDD The big picture is even messier! [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart - Item ID - Inventory Warehouse Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales - Item ID - Name - Description Marketing copy Is item XYZ in a cart? Swap & Insert Prices Move to Saved for…
@mauroservienti | #EDDD …and messier! [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description - Estimated Delivery Shopping Cart - Item ID - Inventory Warehouse Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales Is item XYZ in a cart? Swap & Insert Prices - Item ID - Name - Description Marketing copy - Item ID - Delivery Type Shipping Is item XYZ in a cart? Update XYZ delivery Move to Saved for…
@mauroservienti | #EDDD autonomy? puff, it’s gone
@mauroservienti | #EDDD Can we get rid of all this coupling? [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description - Estimated Delivery Shopping Cart - Item ID - Inventory Warehouse Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales - Item ID - Name - Description Marketing copy - Item ID - Delivery Type Shipping Is item XYZ in a cart? Update XYZ delivery Is item XYZ in a cart? Swap & Insert Prices Move to Saved for…
@mauroservienti | #EDDD shopping cart doesn’t exist
@mauroservienti | #EDDD Sales shopping cart [ list-of ] - Item ID - Quantity - Inventory - Name - Description - Delivery Est. Shopping Cart Warehouse - Item ID - Price - Item ID - Name - Description Marketing - Item ID - Inventory Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD - Item ID - Price - Item ID - Name - Description Marketing Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity Warehouse shopping cart [ list-of ] - Item ID - Quantity - Name - Description - Delivery Est. Shopping Cart [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD Shipping shopping cart [ list-of ] - Item ID - Quantity - Name - Description Shopping Cart [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD Marketing tends to be stable [ list-of ] - Item ID - Quantity Shopping Cart [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD Do we need the Shopping Cart at all? [ list-of ] - Item ID - Quantity Shopping Cart [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD Can Sales be responsible for that concept? [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales Cart ID [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD We followed the coupling [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales Cart ID [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD information structure doesn’t fit users
@mauroservienti | #EDDD Can Read/View Models be a solution? Marketing Sales Shipping Warehouse others ViewModel Storage Shopping Cart
@mauroservienti | #EDDD that’s a cache
@mauroservienti | #EDDD We cannot cache everything
@mauroservienti | #EDDD Shared identifiers [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales Cart ID [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD ViewModel Composition /products/ Browser 1
@mauroservienti | #EDDD ViewModel Composition /products/ Marketing Sales Shipping Warehouse others Browser IDIDIDIDID 1 ViewModel
@mauroservienti | #EDDD How can we build such a page?
@mauroservienti | #EDDD Sales Product Requests Handler
@mauroservienti | #EDDD Sales Request matching
@mauroservienti | #EDDD Sales Composition
@mauroservienti | #EDDD what about writes?
@mauroservienti | #EDDD ViewModel Decomposition [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales Cart ID [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
@mauroservienti | #EDDD ViewModel Decomposition POST -> /shopping-cart/ Browser { ItemID Quantity }
@mauroservienti | #EDDD ViewModel Decomposition POST -> /shopping-cart/ Browser Sales Shipping Warehouse ID Q.ty ID Q.ty ID Q.ty { ItemID Quantity }
@mauroservienti | #EDDD Shipping Shopping Cart Requests Handler
@mauroservienti | #EDDD Shipping Request Matching
@mauroservienti | #EDDD Shipping Decomposition
@mauroservienti | #EDDD things might go wrong
@mauroservienti | #EDDD Shipping Decomposition
@mauroservienti | #EDDD Shipping Shopping Cart Requests Handler
@mauroservienti | #EDDD Shipping Error Handling
@mauroservienti | #EDDD Append Only Model
@mauroservienti | #EDDD there is no such thing as orchestration
@mauroservienti | #EDDD Full Vertical Slices MarketingSales Warehouse Shipping behavior & databehavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition
@mauroservienti | #EDDD services need to communicate
@mauroservienti | #EDDD Business requirements (#4) • Annoy Notify users of 1 week stale carts • Wipe 1 month stale carts
@mauroservienti | #EDDD Services communication channel MarketingSales Warehouse Shipping behavior & databehavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition
@mauroservienti | #EDDD Services communication channel MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart
@mauroservienti | #EDDD Services communication channel MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout
@mauroservienti | #EDDD Services communication channel MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout
@mauroservienti | #EDDD 1 week later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout Cart Got Stale
@mauroservienti | #EDDD 1 week later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout busCart Got Stale
@mauroservienti | #EDDD 1 week later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout bus Cart Got Stale
@mauroservienti | #EDDD 1 week later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & data behavior & data ViewModel Composition ViewModel Composition ViewModel Composition ViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout bus Notify User Cart Got Stale
@mauroservienti | #EDDD 1 month later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout bus Cart Expired
@mauroservienti | #EDDD busCart Expired 1 month later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout Cart Expired
@mauroservienti | #EDDD 1 month later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout busCart Expired Cart Expired
@mauroservienti | #EDDD 1 month later MarketingSales Warehouse Shipping behavior & databehavior & data behavior & data behavior & data ViewModel Composition ViewModel Composition ViewModel Composition ViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout bus Wipe cart Wipe cart Cart Expired Cart Expired
@mauroservienti | #EDDD cross services events can be as thin as event name and identifiers
@mauroservienti | #EDDD bus The final big picture MarketingSales Warehouse Shipping behavior & databehavior & data behavior & databehavior & data UI Shell ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition
@mauroservienti | #EDDD the 45’ tyranny Demos bit.ly/explore-ddd-demos Udi Dahan talking about boundaries go.particular.net/explore-ddd-boundaries
@mauroservienti | #EDDD Takeaways • Boundaries are key to success • Do not bring in more technology to solve non- technical problems
@mauroservienti | #EDDD Takeaways • Boundaries are key to success • Mental model can badly influence design • Users/Business analysts tend to think in term of data presentation
@mauroservienti | #EDDD Takeaways • Boundaries are key to success • Mental model can badly influence design • Do not name things prematurely • Premature names stick and drive data aggregation
@mauroservienti | #EDDD Takeaways • Boundaries are key to success • Mental model can badly influence design • Do not name things prematurely • Behaviors define how to aggregate data • Group data that change together and that influence each other • Use anti-requirements techniques to validate data grouping • Follow the coupling
@mauroservienti | #EDDD Takeaways • Boundaries are key to success • Mental model can badly influence design • Do not name things prematurely • Behaviors define how to aggregate data • Use ViewModel composition to present data • No need for complex projections and read models
@mauroservienti | #EDDD Thank you! I’ll be around to answer your questions the whole day

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All our aggregates are wrong (ExploreDDD 2018)

  • 1. @mauroservienti | #EDDD all our aggregates are wrong Mauro Servienti @mauroservienti
  • 2. @mauroservienti | #EDDD All I wanna do when I wake up in the morning is… Rosanna, Toto. Toto IV
  • 3. @mauroservienti | #EDDD Buy a "Banana Protector"
  • 4. @mauroservienti | #EDDD Buy a "Banana Protector"
  • 5. @mauroservienti | #EDDD Sounds like a nice looking aggregate [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart
  • 6. @mauroservienti | #EDDD It even has behaviors
  • 7. @mauroservienti | #EDDD please, welcome the business
  • 9. @mauroservienti | #EDDD Straightforward, isn’t it? [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart - Item ID - Price Sales
  • 10. @mauroservienti | #EDDD Straightforward, isn’t it? [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart - Item ID - Price Sales copy
  • 11. @mauroservienti | #EDDD Business requirements (#2)
  • 12. @mauroservienti | #EDDD Still not a big deal… - Item ID - Price Sales [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart copy - Item ID - Inventory Warehouse copy
  • 13. @mauroservienti | #EDDD - Item ID - Price Sales [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart - Item ID - Inventory Warehouse However, availability changes over time Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory copy
  • 14. @mauroservienti | #EDDD Business requirements (#3)
  • 15. @mauroservienti | #EDDD - Item ID - Inventory Warehouse …uhm… Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales [ list-of ] - Item ID - Price - Quantity - Inventory - Name - Description Shopping Cart
  • 16. @mauroservienti | #EDDD - Item ID - Inventory Warehouse …uhm… Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales [ list-of ] - Item ID - Price - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart
  • 17. @mauroservienti | #EDDD - Item ID - Inventory Warehouse …uhm… Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales [ list-of ] - Item ID - Price - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart Is item XYZ in a cart? Swap & Insert Prices
  • 18. @mauroservienti | #EDDD - Item ID - Inventory Warehouse …uhm… Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales [ list-of ] - Item ID - Price - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart Is item XYZ in a cart? Swap & Insert Prices Move to Saved for…
  • 19. @mauroservienti | #EDDD - Item ID - Inventory Warehouse It’s becoming messy, isn’t it? - Item ID - Price Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Update XYZ inventory Is item XYZ in a cart? Swap & Insert Prices Move to Saved for… Is item XYZ in a cart? Swap & Insert Prices Move to Saved for…
  • 20. @mauroservienti | #EDDD The big picture is even messier! [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description Shopping Cart - Item ID - Inventory Warehouse Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales - Item ID - Name - Description Marketing copy Is item XYZ in a cart? Swap & Insert Prices Move to Saved for…
  • 21. @mauroservienti | #EDDD …and messier! [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description - Estimated Delivery Shopping Cart - Item ID - Inventory Warehouse Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales Is item XYZ in a cart? Swap & Insert Prices - Item ID - Name - Description Marketing copy - Item ID - Delivery Type Shipping Is item XYZ in a cart? Update XYZ delivery Move to Saved for…
  • 23. @mauroservienti | #EDDD Can we get rid of all this coupling? [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Inventory - Name - Description - Estimated Delivery Shopping Cart - Item ID - Inventory Warehouse Is item XYZ in a cart? Update XYZ inventory - Item ID - Price Sales - Item ID - Name - Description Marketing copy - Item ID - Delivery Type Shipping Is item XYZ in a cart? Update XYZ delivery Is item XYZ in a cart? Swap & Insert Prices Move to Saved for…
  • 24. @mauroservienti | #EDDD shopping cart doesn’t exist
  • 25. @mauroservienti | #EDDD Sales shopping cart [ list-of ] - Item ID - Quantity - Inventory - Name - Description - Delivery Est. Shopping Cart Warehouse - Item ID - Price - Item ID - Name - Description Marketing - Item ID - Inventory Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity - Item ID - Delivery Type Shipping
  • 26. @mauroservienti | #EDDD - Item ID - Price - Item ID - Name - Description Marketing Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity Warehouse shopping cart [ list-of ] - Item ID - Quantity - Name - Description - Delivery Est. Shopping Cart [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
  • 27. @mauroservienti | #EDDD Shipping shopping cart [ list-of ] - Item ID - Quantity - Name - Description Shopping Cart [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
  • 28. @mauroservienti | #EDDD Marketing tends to be stable [ list-of ] - Item ID - Quantity Shopping Cart [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
  • 29. @mauroservienti | #EDDD Do we need the Shopping Cart at all? [ list-of ] - Item ID - Quantity Shopping Cart [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
  • 30. @mauroservienti | #EDDD Can Sales be responsible for that concept? [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales Cart ID [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
  • 31. @mauroservienti | #EDDD We followed the coupling [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales Cart ID [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
  • 33. @mauroservienti | #EDDD Can Read/View Models be a solution? Marketing Sales Shipping Warehouse others ViewModel Storage Shopping Cart
  • 35. @mauroservienti | #EDDD We cannot cache everything
  • 36. @mauroservienti | #EDDD Shared identifiers [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales Cart ID [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
  • 37. @mauroservienti | #EDDD ViewModel Composition /products/ Browser 1
  • 38. @mauroservienti | #EDDD ViewModel Composition /products/ Marketing Sales Shipping Warehouse others Browser IDIDIDIDID 1 ViewModel
  • 39. @mauroservienti | #EDDD How can we build such a page?
  • 40. @mauroservienti | #EDDD Sales Product Requests Handler
  • 41. @mauroservienti | #EDDD Sales Request matching
  • 44. @mauroservienti | #EDDD ViewModel Decomposition [ list-of ] - Cart ID - Item ID - Quantity - Delivery Est. - Item ID - Price - Item ID - Name - Description Marketing Sales Cart ID [ list-of ] - Item ID - CurrentPrice - LastPrice - Quantity [ list-of ] - Cart ID - Item ID - Inventory - Quantity Warehouse - Item ID - Inventory - Item ID - Delivery Type Shipping
  • 45. @mauroservienti | #EDDD ViewModel Decomposition POST -> /shopping-cart/ Browser { ItemID Quantity }
  • 46. @mauroservienti | #EDDD ViewModel Decomposition POST -> /shopping-cart/ Browser Sales Shipping Warehouse ID Q.ty ID Q.ty ID Q.ty { ItemID Quantity }
  • 47. @mauroservienti | #EDDD Shipping Shopping Cart Requests Handler
  • 52. @mauroservienti | #EDDD Shipping Shopping Cart Requests Handler
  • 55. @mauroservienti | #EDDD there is no such thing as orchestration
  • 56. @mauroservienti | #EDDD Full Vertical Slices MarketingSales Warehouse Shipping behavior & databehavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition
  • 57. @mauroservienti | #EDDD services need to communicate
  • 58. @mauroservienti | #EDDD Business requirements (#4) • Annoy Notify users of 1 week stale carts • Wipe 1 month stale carts
  • 59. @mauroservienti | #EDDD Services communication channel MarketingSales Warehouse Shipping behavior & databehavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition
  • 60. @mauroservienti | #EDDD Services communication channel MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart
  • 61. @mauroservienti | #EDDD Services communication channel MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout
  • 62. @mauroservienti | #EDDD Services communication channel MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout
  • 63. @mauroservienti | #EDDD 1 week later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout Cart Got Stale
  • 64. @mauroservienti | #EDDD 1 week later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout busCart Got Stale
  • 65. @mauroservienti | #EDDD 1 week later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout bus Cart Got Stale
  • 66. @mauroservienti | #EDDD 1 week later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & data behavior & data ViewModel Composition ViewModel Composition ViewModel Composition ViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout bus Notify User Cart Got Stale
  • 67. @mauroservienti | #EDDD 1 month later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout bus Cart Expired
  • 68. @mauroservienti | #EDDD busCart Expired 1 month later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout Cart Expired
  • 69. @mauroservienti | #EDDD 1 month later MarketingSales Warehouse Shipping behavior & data behavior & data behavior & databehavior & data ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout busCart Expired Cart Expired
  • 70. @mauroservienti | #EDDD 1 month later MarketingSales Warehouse Shipping behavior & databehavior & data behavior & data behavior & data ViewModel Composition ViewModel Composition ViewModel Composition ViewModel Composition Add Item to Cart 1. Set 1 week timeout 2. Set 1 month timeout bus Wipe cart Wipe cart Cart Expired Cart Expired
  • 71. @mauroservienti | #EDDD cross services events can be as thin as event name and identifiers
  • 72. @mauroservienti | #EDDD bus The final big picture MarketingSales Warehouse Shipping behavior & databehavior & data behavior & databehavior & data UI Shell ViewModel Composition ViewModel Composition ViewModel CompositionViewModel Composition
  • 73. @mauroservienti | #EDDD the 45’ tyranny Demos bit.ly/explore-ddd-demos Udi Dahan talking about boundaries go.particular.net/explore-ddd-boundaries
  • 74. @mauroservienti | #EDDD Takeaways • Boundaries are key to success • Do not bring in more technology to solve non- technical problems
  • 75. @mauroservienti | #EDDD Takeaways • Boundaries are key to success • Mental model can badly influence design • Users/Business analysts tend to think in term of data presentation
  • 76. @mauroservienti | #EDDD Takeaways • Boundaries are key to success • Mental model can badly influence design • Do not name things prematurely • Premature names stick and drive data aggregation
  • 77. @mauroservienti | #EDDD Takeaways • Boundaries are key to success • Mental model can badly influence design • Do not name things prematurely • Behaviors define how to aggregate data • Group data that change together and that influence each other • Use anti-requirements techniques to validate data grouping • Follow the coupling
  • 78. @mauroservienti | #EDDD Takeaways • Boundaries are key to success • Mental model can badly influence design • Do not name things prematurely • Behaviors define how to aggregate data • Use ViewModel composition to present data • No need for complex projections and read models
  • 79. @mauroservienti | #EDDD Thank you! I’ll be around to answer your questions the whole day

Editor's Notes

  1. I’m a remote worker We live in a small flat, thus I have a small office I enjoy going to the office by bike And I enjoy bananas for my breaks Bike riding and bananas in the backpack are not a great idea, so…
  2. How is this thing designed?
  3. I’m a remote worker I enjoy going to work by bike And I enjoy bananas as lunch breaks Bike riding and bananas in the backpack are not a great idea, so…
  4. Price cannot unexpectedly change while an item is in the cart
  5. Price cannot unexpectedly change while an item is in the cart
  6. we could have shipping that kicks in to define shipping policies, and so on.
  7. distributed monolith
  8. Distributed monolith
  9. The least amount of coupling
  10. Sales conceptually own the shopping car concept
  11. Sales conceptually own the shopping car concept
  12. Sales conceptually own the shopping car concept
  13. Sales conceptually own the shopping car concept
  14. Since we have very low, if not zero, coupling across services.