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TAMING THE MONOLITH Are microservices just an implementation detail? #GOTOnight Cologne | June 22nd, 2015 | Dennis Traub | @DTraub

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EVERYBODY TALKS ABOUT MICROSERVICES 2

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https://i2.wp.com/www.aydinstone.com/vic20.jpg

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http://www.weihenstephan.org/~michaste/pagetable/64er/64er_1984-04.jpg | http://www.c64-wiki.de/images/thumb/4/43/listing_shape.jpg/300px-listing_shape.jpg

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- A sphere of knowledge, influence, or activity - - What an organisation does, and the world it does it in - DOMAIN

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- A system of abstractions describing selected aspects of a Domain - - Used to solve problems related to that Domain - MODEL

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SIT DOWN WITH THE EXPERTS & LISTEN

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http://wikimediafoundation.org/wiki/File:Commodore-VIC-20-FL.jpg

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http://wikimediafoundation.org/wiki/File:Commodore-VIC-20-FL.jpg http://backgrounds.1nova.com/wp-content/uploads/sites/27/2015/02/One-Ring-to-Rule-them-All.jpg ONE MODEL TO RULE THEM ALL

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- A language structured around the Domain Model - - Used by all team members and throughout the code - UBIQUITOUS LANGUAGE

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Customer

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Customer Marketing Target Group

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Customer Marketing Target Group Website Visitor

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Customer Marketing Target Group Website Visitor Shopping Cart Buyer

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Customer Recipient Shipping Marketing Target Group Website Visitor Shopping Cart Buyer

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Customer Recipient Shipping Marketing Target Group Hotline Caller Website Visitor Shopping Cart Buyer

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Customer Recipient Shipping Marketing Target Group Hotline Caller Website Visitor Shopping Cart Buyer Purchasing Customer

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- An explicit boundary within which a Domain Model exists - - Inside, all terms have a specific meaning - - They are part of the Ubiquitous Language - BOUNDED CONTEXT

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Customer Recipient Shipping Marketing Target Group Hotline Caller Website Visitor Shopping Cart Buyer Purchasing Customer

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Customer Recipient Shipping Marketing Target Group Hotline Caller Website Visitor Shopping Cart Buyer Purchasing Customer

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KEY ATTRIBUTES OF A BOUNDED CONTEXT High Cohesion Loose Coupling Represents Business Capability Context-specific Model

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KEY ATTRIBUTES OF A MICROSERVICE High Cohesion Loose Coupling Represents Business Capability Context-specific Model

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We don’t model reality We model useful abstractions

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We don’t build a model that works for everyone

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THANK YOU! Dennis Traub | @DTraub | #GOTOnight