Integrating Bounded Contexts

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INTEGRATING BOUNDED CONTEXTS USING DOMAIN-DRIVEN DESIGN & MESSAGING @indu_alagarsamy

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Source: http://www.themost10.com/interesting-facts-about-starbucks/

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Source: https://www.theatlantic.com/business/archive/2015/01/the-logic-of-long-lines/384870/

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Source: http://www.hufﬁngtonpost.com/2015/04/11/peter-dinklage-game-of-thrones-scene-secret-meaning_n_7046990.html

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Cashier Barista MakeTheDrink(drinkSpecs); drink object ProcessCharge(); return drink; OrderDrink(); Temporal Coupling

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Source: http://ihateworkinginretail.ooid.com/wp-content/uploads/2014/09/BARISTA1.jpg

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Source: http://www.holytaco.com/9-most-annoying-people-starbucks/

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DrinkOrdered CustomerDrinkPrepared Cashier Barista OrderDrink Publish - Subscribe

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Source: http://www.iainclaridge.co.uk/blog/wp-content/uploads/2013/01/snow_bus.jpg EVENT-DRIVEN ARCHITECTURE

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Source: http://www.planetmountain.com/img/1/12182.jpg QUEUES

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COMMANDS & EVENTS @indu_alagarsamy Something of importance happened Do something Domain Event Command

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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

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@indu_alagarsamy EVENTSTORMING Source: dddeurope.com

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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

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Mycenae, Greece Multiple messages can take part in a business process AircraftTypeHasChanged NotifyCustomer RebookFlight BookingWasCancelled @indu_alagarsamy FLIGHT PLANNING BOUNDED CONTEXT BOOKING BOUNDED CONTEXT

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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

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BOOKING LOYALTY CustomerWasPromotedToGold CustomerWasPromotedToPlatinum Customer PromotionInfo FLIGHT PLANNING AircraftTypeHasChanged ProposeRebooking @indu_alagarsamy Make Autonomous Decisions

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@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

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THANK YOU @indu_alagarsamy https://indu.dev https://go.particular.net/ddd2020