Post on 30-Jul-2015
TAMING THE MONOLITHAre microservices just an implementation detail?
#GOTOnight Cologne | June 22nd, 2015 | Dennis Traub | @DTraub
EVERYBODY TALKS ABOUT MICROSERVICES
2
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
- A sphere of knowledge, influence, or activity - - What an organisation does, and the world it does it in -
DOMAIN
- A system of abstractions describing selected aspects of a Domain - - Used to solve problems related to that Domain -
MODEL
SIT DOWN WITH THE EXPERTS & LISTEN
http://wikimediafoundation.org/wiki/File:Commodore-VIC-20-FL.jpg
http://wikimediafoundation.org/wiki/File:Commodore-VIC-20-FL.jpghttp://backgrounds.1nova.com/wp-content/uploads/sites/27/2015/02/One-Ring-to-Rule-them-All.jpg
ONE MODEL TO RULE THEM ALL
- A language structured around the Domain Model - - Used by all team members and throughout the code -
UBIQUITOUS LANGUAGE
Customer
Customer
Marketing
Target Group
Customer
Marketing
Target Group
Website
Visitor
Customer
Marketing
Target Group
Website
Visitor
Shopping Cart
Buyer
Customer
Recipient
ShippingMarketing
Target Group
Website
Visitor
Shopping Cart
Buyer
Customer
Recipient
ShippingMarketing
Target Group
Hotline
Caller
Website
Visitor
Shopping Cart
Buyer
Customer
Recipient
ShippingMarketing
Target Group
Hotline
Caller
Website
Visitor
Shopping Cart
Buyer
Purchasing
Customer
- 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
Customer
Recipient
ShippingMarketing
Target Group
Hotline
Caller
Website
Visitor
Shopping Cart
Buyer
Purchasing
Customer
Customer
Recipient
ShippingMarketing
Target Group
Hotline
Caller
Website
Visitor
Shopping Cart
Buyer
Purchasing
Customer
KEY ATTRIBUTES OF A BOUNDED CONTEXT
High Cohesion Loose Coupling
Represents Business Capability Context-specific Model
KEY ATTRIBUTES OF A MICROSERVICE
High Cohesion Loose Coupling
Represents Business Capability Context-specific Model
We don’t model reality We model useful abstractions
We don’t build a model that works for everyone
THANK YOU! Dennis Traub | @DTraub | #GOTOnight