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Finding your service boundaries - a practical guide

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We know it's useful to split up complex systems. We've seen the benefits of modular deployment of microservices. Dealing with only one piece of code at a time eases our cognitive load. But how do we know where to draw the service boundaries? In complex business domains, it's often difficult to know where to start. When we get our boundaries wrong, the clocks starts ticking. Before long, we hear ourselves say "it would be easier to re-write it".

Join Adam for practical advice on discovering the hidden boundaries in your systems. Help tease out the natural separation of concerns in a sample business domain. During 20 years of developing complex systems, Adam has had plenty of time to get things wrong. Learn to avoid the common pitfalls that can lead us down the path to "the big re-write".

Webinar recording: https://particular.net/webinars/finding-your-service-boundaries-a-practical-guide

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Finding your service boundaries - a practical guide

  1. 1. @adamralph FINDING YOUR SERVICE BOUNDARIES — A PRACTICAL GUIDE
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  12. 12. @adamralph BIG BALL OF MUD Machine Machine MachineMachine
  13. 13. @adamralph Service Service Service Service
  14. 14. @adamralph WHAT A SERVICE IS NOT Something with only functionality is a function: calculation, validation, etc. Something with only data is a database: [create, read, update, delete] entity. HTTP/WSDL makes no difference.
  15. 15. @adamralph WHAT IS A SERVICE? A service is the technical authority for a specific business capability. All data & business rules reside within the service (a bounded context). Nothing is “left over” after identifying services. Everything must be in some service.
  16. 16. @adamralph S1 S2 S3 MOBILE BACK END PORTAL SYSTEMS & SERVICES
  17. 17. @adamralph DECOMPOSING A DOMAIN public class Customer { FirstName LastName Status // etc } public class Product { Name Description Price // etc } • Customer status • Product price • Customer’s first name • Customer’s last name • Product name • Product description RED GREEN YELLOW
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  29. 29. @adamralph FINDING YOUR SERVICE BOUNDARIES — A PRACTICAL GUIDE

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