.NET Day 2024: Implementing the planet's largest e-commerce site using service boundaries

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Transcript

1. Implementing the planet's largest e-commerce site using vertical slices By Dennis van der Stelt
2. WHY VERTICAL SLICES Complex software systems stay maintainable with highly cohesive and low coupled slices FINDING SERVICE BOUNDARIES Use a well-known business process and find consistency boundaries and data ownership CODING VERTICAL SLICES Use data composition, service-oriented architecture, event-driven architecture, and more architectural styles
4. inventory orders website orders inventory where does it start Coupling products products
5. inventory products orders website orders products inventory where does it start Coupling
6. inventory products orders website orders products inventory products inventory orders orders products inventory Logical View Physical View where does it start Coupling
7. inventory products orders website orders products inventory products inventory orders orders products inventory Logical View Physical View where does it start Coupling
8. inventory products orders website orders products inventory products inventory orders orders products inventory Logical View Physical View WebAPI WebAPI WebAPI where does it start Coupling
9. inventory products orders website orders products inventory products inventory orders orders products inventory Logical View Physical View WebAPI WebAPI WebAPI where does it start Coupling
11. inventory products orders website orders products inventory products inventory orders orders products inventory Logical View Physical View WebAPI WebAPI WebAPI where does it end Coupling
12. inventory products orders website orders products inventory products inventory orders orders products inventory Logical View Physical View where does it end Coupling
13. inventory products orders website orders products inventory products inventory orders orders products inventory Logical View Physical View where does it end Coupling
14. inventory inventory where does it end Coupling
15. data storage where does it end Coupling front-end business logic
16. where does it end Coupling data storage front-end business logic
17. where does it end Coupling
18. where does it end Coupling 01 High Cohesion 02 Low Coupling 03 Maintainability 04 Concurrency 05 Conway’s Law
19. Autonomous microservices don’t share data. Period. Dennis van der Stelt Finding your service boundaries – a practical guide Adam Ralph Finding Service Boundaries – illustrated in healthcare Udi Dahan
22. OmNomNom Because beer is good, but beers are better.
23. Shopping Cart https://www.omnomnom.dev/abraxas/ Abraxas by Perennial Artisan Ales Proceed to checkout Subtotal: $42.00 Quantity Item Price $42.00 1 This list contains a gift. or Sign in for 1 click ordering. 1 start checkout
24. Where should we deliver your order? Enter a shipping address Full Name: https://www.omnomnom.dev/buy/shippingaddress/ Dennis van der Stelt Address Line 1: Van Zandvlietplein 1 City: Rotterdam Country: The Netherlands Ship to this Address 2 shipping address
25. When do you need it? Shipping from Amazon.com Abraxas https://www.omnomnom.dev/buy/delivery/ Perennial Artisan Ales Hard cover - New Continue Choose a delivery option $42.00 – Quantity: 1 Amazon Standard Shipping $7.98 – Averages 9-14 business days Amazon Expedited Shipping $20.98 – Averages 7-10 business days Amazon Priority Shipping $49.98 – Averages 2-5 business days 3 shipping method
26. When do you need it? Shipping from Amazon.com Abraxas https://www.omnomnom.dev/buy/delivery/ Perennial Artisan Ales Hard cover - New Continue Choose a delivery option $42.00 – Quantity: 1 Amazon Standard Shipping $7.98 – Averages 9-14 business days Amazon Expedited Shipping $20.98 – Averages 7-10 business days Amazon Priority Shipping $49.98 – Averages 2-5 business days 3 shipping method
27. Select a payment option Your credit and debit cards https://www.omnomnom.dev/buy/payment/ Amazon accepts all major credit and debit cards > Add a card Continue MasterCard ending in 2464 Dennis van der S… 09/2026 More payment options Please tell us the currency of your card My card is in US Dollar My card is in a different currency: select a currency 4 payment method
28. Review your order https://www.omnomnom.dev/buy/payment/ Shipping address Dennis van der Stelt Van Zandvlietplein 1 Rotterdam, The Netherlands Payment method ending in 2464 Billing Address Same as shipping address Estimated delivery: Aug 17, 2018 – Aug 21, 2018 Abraxas by Perennial Artisan Ales $42.00 - Quantity: 1 change change change Place your order Order Summary Items: Shipping: Total before tax: Estimated tax: Order Total $42.00 $7.98 $49.98 $0.00 $49.98 5 summary finalize
29. 01 Service A ce C ProductId Name Description Image Category 1 02 Service A Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 2 03 Service A Service B oductId Stock derId oductId uantity oductId ame escription age tegory 3 4 e A e B n 4 5 BOUNDARIES service Finding
30. 01 ProductId Price Discount Service A Service C ProductId Name Description Image Category 1 02 Service A Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 2 03 Service A Service B oductId Stock derId oductId uantity oductId ame escription age tegory 3 4 e A e B n 4 5 BOUNDARIES service Finding Shopping Cart https://www.omnomnom.dev/abraxas/ Abraxas by Perennial Artisan Ales Proceed to checkout Subtotal: $42.00 Quantity Item Price $42.00 1 This list contains a gift. or Sign in for 1 click ordering.
31. 01 ProductId Price Discount Service A Service C ProductId Name Description Image Category 1 02 ProductId Price Discount Service A Service C Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 2 03 Service A Service B oductId Stock derId oductId uantity oductId ame escription age tegory 3 4 e A e B n 4 5 BOUNDARIES service Finding Shopping Cart https://www.omnomnom.dev/abraxas/ Abraxas by Perennial Artisan Ales Proceed to checkout Subtotal: $42.00 Quantity Item Price $42.00 1 This list contains a gift. or Sign in for 1 click ordering.
32. 01 ProductId Price Discount Service A Service C ProductId Name Description Image Category 1 02 ProductId Price Discount Service A Service C Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 2 03 ProductId Price Discount OrderId ProductId PriceId DeliveryOptionId Quantity BillingAddress DeliveryOptionId Price DeliveryOptionId Type Description International OrderId CustomerId DeliveryOptionId ShippingAddress Service D Service A Service C Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 3 4 e A e B n 4 5 BOUNDARIES service Finding When do you need it? Shipping from Amazon.com Patterns of Enterprise Application Ar… https://www.amazon.com/buy/delivery/ Martin Fowler Hard cover - New Continue Choose a delivery option $42.00 – Quantity: 1 Amazon Standard Shipping $7.98 – Averages 9-14 business days Amazon Expedited Shipping $20.98 – Averages 7-10 business days Amazon Priority Shipping $49.98 – Averages 2-5 business days
33. 01 ProductId Price Discount Service A Service C ProductId Name Description Image Category 1 02 ProductId Price Discount Service A Service C Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 2 03 ProductId Price Discount OrderId ProductId PriceId DeliveryOptionId Quantity BillingAddress DeliveryOptionId Price DeliveryOptionId Type Description International OrderId CustomerId DeliveryOptionId ShippingAddress Service D Service A Service C Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 3 04 ProductId Price Discount OrderId ProductId PriceId DeliveryOptionId Quantity BillingAddress CreditCardId Cardholder LastDigits ExpiryDate Token DeliveryOptionId Price DeliveryOptionId Type Description International OrderId CustomerId DeliveryOptionId ShippingAddress Service D Service A Service C Service B Service E ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 4 5 BOUNDARIES service Finding Select a payment option Your credit and debit cards https://www.amazon.com/buy/payment/ Amazon accepts all major credit and debit cards > Add a card Continue MasterCard ending in 2464 Udi Dahan 09/2026 More payment options Please tell us the currency of your card My card is in US Dollar My card is in a different currency: select a currency
34. 01 ProductId Price Discount Service A Service C ProductId Name Description Image Category 1 02 ProductId Price Discount Service A Service C Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 2 03 ProductId Price Discount OrderId ProductId PriceId DeliveryOptionId Quantity BillingAddress DeliveryOptionId Price DeliveryOptionId Type Description International OrderId CustomerId DeliveryOptionId ShippingAddress Service D Service A Service C Service B ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 3 04 ProductId Price Discount OrderId ProductId PriceId DeliveryOptionId Quantity BillingAddress CreditCardId Cardholder LastDigits ExpiryDate Token DeliveryOptionId Price DeliveryOptionId Type Description International OrderId CustomerId DeliveryOptionId ShippingAddress Service D Service A Service C Service B Service E ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 4 05 ProductId Price Discount OrderId ProductId PriceId DeliveryOptionId Quantity BillingAddress CreditCardId Cardholder LastDigits ExpiryDate Token DeliveryOptionId Price DeliveryOptionId Type Description International OrderId CustomerId DeliveryOptionId ShippingAddress ProductId Reviews Stars Shipping Catalog Finance Catalog PaymentInfo Marketing ProductId InStock OrderId ProductId Quantity ProductId Name Description Image Category 5 BOUNDARIES service Finding Review your order https://www.amazon.com/buy/payment/ Shipping address Udi Dahan 20 Uri Tzvi Greenberg Street Haifa, Israel Payment method ending in 2464 Billing Address Same as shipping address Estimated delivery: Aug 17, 2018 – Aug 21, 2018 Patterns of Enterprise Application Architecture by Martin Fowler $42.00 - Quantity: 1 change change change Place your order Order Summary Items: Shipping: Total before tax: Estimated tax: Order Total $42.00 $7.98 $49.98 $0.00 $49.98
38. COMPOSED UI Instead of starting with coupling in the database, we removed coupling as much as possible and did not introduce it until in the user interface. It’s possible to take it up even higher and introduce microviews that are deployed to the website. (I challenge you to a Pull Request in the GitHub repo)
39. SERVICE BUS Temporal coupling is removed by replacing RPC calls between services with messages using a service bus. Concepts like publish/subscribe, increased reliability and better performance Events are published across service boundaries and contain only the least volatile data; identifiers.
40. INVOICES Invoices and emails are also user interfaces where data needs to be composed from the back end. These are still owned by the system. Ask me how to integrate with third parties that don’t know anything about your service boundaries.
41. go.particular.net/dennis free 2-day video course on distributed systems and more…
42. Thanks go.particular.net/dennis free 2-day video course on distributed systems and more… for listening