Taming the Monolith – Are Microservices Just an Implementation Detail?

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Dennis Traub's talk from the first GOTO Night in Cologne. Domain-Driven Design changed the way we reason about large software systems. Modern practices, tools and technologies like continuous delivery, NoSQL, and cloud-based virtualization allow the creation of fine-grained systems to solve the specific problems at hand. Having DDD in mind and technical expertise at our hands, with microservice architectures we can build complex systems that reflect our businesses’ complex realities and are easy to change at the same time. This talk will show what DDD and microservice architectures have in common and how you can use both to create software systems that fit your domain.

Serviceleistungen Technologie

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

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

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

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
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

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

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