Back Day - REX Société Générale - Explorer les principes de l'Event Sourcing
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La simplicité comme moyen d'être performant, résilient et de réduire le Time To Market. Il y a 1 an et demi, la Société Générale a décidé de construire un nouveau service de vente électronique de nos produits financiers. Les contraintes étaient claires : "le système sera performant, auditable, résilient et développé de manière à avoir un Time To Market court". Une seule solution s'imposait à nous : faire simple, très simple ! Ainsi à travers cette présentation, nous vous raconterons notre quête de simplicité. Vous verrez ainsi que notre stack technique ne contient quasiment aucun framework, juste quelques bibliothèques utiles ou indispensables. Notre code se structure autour de quelques principes : l'Event Sourcing, un peu de Domain Driven Design et une discipline de fer en matière de qualité et de tests automatisés (BDD for the win!).
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Back Day - REX Société Générale - Explorer les principes de l'Event Sourcing
- 1. Construire le SI de demain REX Société Générale La simplicité comme moyen d'être performant, résilient et de réduire le Time To Market
- 7. Palladium
- 11. Commodity Trading Company Few Months Later Hedging Physical Delivery
- 17. The Constraints Reliability / Resilience Performance Productivity / Time To Market
- 19. Simple ≠ Easy
- 21. Functional and Code Reduce the impedance between Our Goal
- 22. Orchestration Let’s take an example with our main component
- 26. Event Sourcing
- 27. « Capture all changes to an application state as a sequence of events » Martin Fowler
- 28. Date Money Out Money In 2015/05/14 100 2015/05/14 -20 2015/05/16 -30 2015/05/24 380 2015/06/01 -70 Total -120 480 Balance 360
- 29. WithdrawalPerformed accountId: 9387 amount: 30€ BankAccount id: 9387 balance: 0€ WithdrawalPerformed accountId: 9387 amount: 20€ DepositPerformed accountId: 9387 amount: 100€ BankAccount id: 9387 balance: 50€ BankAccount id: 9387 balance: 100€ BankAccount id: 9387 balance: 80€ Inspired by B. Reitzammer & J. Seitz - http://ookami86.github.io/event-sourcing-in-practice Apply to Apply to Apply to Produces Produces Produces
- 30. J. Chassaing - http://thinkbeforecoding.com/post/2014/01/04/Event-Sourcing.-Draw-it
- 31. BankAccount id: 9387 balance: 0€ WithdrawalPerforme accountId: 9387 amount: 20€ DepositPerformed accountId: 9387 amount: 100€ BankAccount id: 9387 balance: 100€ Bug Inspired by B. Reitzammer & J. Seitz - http://ookami86.github.io/event-sourcing-in-practice Apply to Apply to Produces Produces
- 32. WithdrawalPerformed accountId: 9387 amount: 30€ BankAccount id: 9387 balance: 0€ WithdrawalPerformed accountId: 9387 amount: 20€ DepositPerformed accountId: 9387 amount: 100€ BankAccount id: 9387 balance: 100€ BankAccount id: 9387 balance: 70€ Inspired by B. Reitzammer & J. Seitz - http://ookami86.github.io/event-sourcing-in-practice Apply to Apply to Produces Produces
- 34. « DDD is about designing software based on models of the underlying (business) domain » Martin Fowler
- 36. Durable business model Extensibility Clean Architecture Solid Responsibility Segregation
- 37. Using Event Sourcing and DDD concepts in Multiplus
- 39. Transaction {aggregate root} Pricing {entity} Execution {entity} Orchestration {entity} ReceiveQuote {command/value object} quoteRequestId: 4563 price: 100€ QuoteReceived {event/value object} accountId: 4563 price: 110€ - Multiplus Business Logic -
- 42. Multiplus Business Logic ReceiveQuote {command} quoteRequestId: 4563 price: 100€ QuoteForwarded {event} accountId: 4563 price: 101€ Multiplus Business Logic ReceiveQuote {command} quoteRequestId: 4563 price: 100€ QuoteForwarded {event} accountId: 4563 price: 102€ 2015/06/01 Margin: 1% 2015/11/01 Margin: 2%
- 44. Multiplus Business Logic ReceiveQuote {command} QuoteForwarded {event} Customer EventBus QuoteForwardedHandler {handler} {Quote n° 65746} {Quote n° 65746} ?? QuoteReceived {event} ForwardQuote {action}
- 45. Multiplus Business Logic ReceiveQuote {command} QuoteForwarded {event} Customer EventBus QuoteForwardedHandler {handler} Customer gateway {Quote n° 65746} {Quote n° 65746} QuoteReceived {event} ForwardQuote {action}
- 46. Store the events produced by the Decide function
- 47. Multiplus Business Logic ReceiveQuote {command} quoteRequestId: 4563 price: 100€ QuoteForwarded {event} accountId: 4563 price: 101€ Multiplus Business Logic 2015/06/01 Margin: 1% 2015/11/01 Margin: 2% QuoteForwarded {event} accountId: 4563 price: 101€
- 49. It’s all in the past !
- 50. Date Money Out Money In 2015/05/14 100 2015/05/14 -20 2015/05/16 -30 2015/05/24 30 2015/06/01 -70 Total -120 130 Balance 10
- 51. Behavior Driven Development Conversation Collaboration Specifications By Examples Three Amigos Automation Ubiquitous Language
- 55. you will new comers thank … but you’ll enjoy it too !
- 56. warning
- 57. doing BDD right easy is not
- 58. BDD Common Issues Business and developper faces collaboration difficulties Mess with the scenario writing Automation Nightmare
- 59. BDD Common Issues Business and developper faces collaboration difficulties Mess with the scenario writing Automation Nightmare
- 61. we tend to let everywhere business rules being dispatch
- 62. … making them hard to test
- 63. Hexagonal Architecture the onion architecture the clean architecture ports and adapters
- 68. use different granularity business scenarios when expressing your levels
- 69. Given a quantity value of 1000 in G When the quantity is converted in OZ Then the converted quantity is 32.1507 OZ Given a quote request with a way BUY And the credit check request has been sent When the credit check response is in error Then the pricer does not receive a quote request And the platform quote status is REJECTED Given an authorized product type When the customer sends the rfs Then the pricer receives the rfs When the pricer sends a quote Then the customer receives the quote Workflow Feature Unit
- 70. « l’enfer c’est les autres » Jean-Paul Sartre
- 74. care about the contract between your app and another
- 76. there’s always implicit a schema even if it’s
- 81. Our architecture is easy to deploy !
- 82. Simple
- 83. Simple No More Technologies Than Required
- 84. Simple No More Technologies Than Required Business Centric
- 85. Simple No More Technologies Than Required Business Centric Code Understanding is Key
- 86. Simple No More Technologies Than Required Business Centric CourageCode Understanding is Key
- 87. Any Questions ?