Integrating Bounded Contexts

A bounded context is a safe place for models to evolve freely. There are no conflicts or contradictions within a bounded context. So, how does one convey important and meaningful changes that happen within the context that can impact the overall system? Messaging can be useful as an integration mechanism between bounded contexts. Learn how you can combine the principles of DDD with event-driven architecture to build truly autonomous services, a.k.a microservices.

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1. INTEGRATING BOUNDED CONTEXTS USING DOMAIN-DRIVEN DESIGN & MESSAGING @indu_alagarsamy
2. Source: http://www.themost10.com/interesting-facts-about-starbucks/
3. Source: https://www.theatlantic.com/business/archive/2015/01/the-logic-of-long-lines/384870/
4. Source: http://www.huffingtonpost.com/2015/04/11/peter-dinklage-game-of-thrones-scene-secret-meaning_n_7046990.html
5. Cashier Barista MakeTheDrink(drinkSpecs); drink object ProcessCharge(); return drink; OrderDrink(); Temporal Coupling
6. Source: http://ihateworkinginretail.ooid.com/wp-content/uploads/2014/09/BARISTA1.jpg
7. Source: http://www.holytaco.com/9-most-annoying-people-starbucks/
8. DrinkOrdered CustomerDrinkPrepared Cashier Barista OrderDrink Publish - Subscribe
9. Source: http://www.iainclaridge.co.uk/blog/wp-content/uploads/2013/01/snow_bus.jpg EVENT-DRIVEN ARCHITECTURE
10. Source: http://www.planetmountain.com/img/1/12182.jpg QUEUES
11. COMMANDS & EVENTS @indu_alagarsamy Something of importance happened Do something Domain Event Command
12. WHEN an aircraft type is changed: Passenger gets notified with a new booking proposal Passenger can cancel flight Passenger can accept proposed booking @indu_alagarsamy
13. @indu_alagarsamy EVENTSTORMING Source: dddeurope.com
14. Mycenae, Greece A Business Process can be triggered by an event from a different bounded context AircraftTypeHasChanged FLIGHT PLANNING BOUNDED CONTEXT BOOKING BOUNDED CONTEXT WHEN an aircraft type is changed @indu_alagarsamy
15. Mycenae, Greece Multiple messages can take part in a business process AircraftTypeHasChanged NotifyCustomer RebookFlight BookingWasCancelled @indu_alagarsamy FLIGHT PLANNING BOUNDED CONTEXT BOOKING BOUNDED CONTEXT
16. WHEN an aircraft type is changed: Only passengers with Premium status gets notified with a new booking proposal Passenger can cancel flight Passenger can accept proposed booking @indu_alagarsamy
17. BOOKING LOYALTY CustomerWasPromotedToGold CustomerWasPromotedToPlatinum Customer PromotionInfo FLIGHT PLANNING AircraftTypeHasChanged ProposeRebooking @indu_alagarsamy Make Autonomous Decisions
18. @indu_alagarsamy Talk to domain experts. Eventstorm with them. Models are not perfect Evolve and refactor with an obsession for domain language Strive for Autonomy. Use events to communicate between bounded contexts
19. THANK YOU @indu_alagarsamy https://indu.dev https://go.particular.net/ddd2020