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@adamralph
FINDING YOUR
SERVICE BOUNDARIES
— A PRACTICAL GUIDE
@adamralph
@adamralph
@adamralph
BIG BALL OF MUD
@adamralph
Service Service
Service Service
@adamralph
BIG BALL OF MUD
Machine Machine
MachineMachine
@adamralph
WORKFLOWS
Multi Qlti Tap Bar, Szewska 21
31-009 Kraków, Poland
@adamralph
OrderPlaced
WORKFLOW MESSAGES
Finance ShippingSales
OrderBilled
OrderShipped
PlaceOrder
@adamralph
WORKFLOW MESSAGES
OrderId = 022032ba-1337-43a5-90c9-d48b58742c7
@adamralph
Finance
Sales
WORKFLOW MESSAGES
Multi Qlti Tap Bar, Szewska 21
31-009 Kraków, PolandShipping
@adamralph
OrderPlaced
(OrderId)
WORKFLOW MESSAGES
Finance ShippingSales
OrderBilled
(OrderId)
OrderShipped
(OrderId)
PlaceOrder
(OrderId)
Change
Address
(OrderId)
Change
CreditCard
(OrderId)
@adamralph
BIG BALL OF MUD
Machine Machine
MachineMachine
@adamralph
Service Service
Service Service
@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.
@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.
@adamralph
S1 S2 S3
MOBILE
BACK END
PORTAL
SYSTEMS & SERVICES
@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
@adamralph
Home insurance
Travel insurance
Car insurance
Policy Service
Home insurance
Travel insurance
Car insurance
Claims Service
Insured vehicle
Coverage
PolicyId
ClaimId
Car Insurance
Home owner
Coverage
PolicyId
ClaimId
Home Insurance
Insured persons
Coverage
PolicyId
ClaimId
Travel Insurance
INSURANCE
Home insurance
Travel insurance
Car insurance
Policy Service
Home insurance
Travel insurance
Car insurance
Claims Service
@adamralph
@adamralph
MICROSERVICES
@adamralph
BIG BALL OF MUD
@adamralph
@adamralph
@adamralph
@adamralph
@adamralph
BIG BALL OF MUD
Microservices Edition™
@adamralph
ID
ID
ID
ID
IDID
STATE-
MENTS
FRAUD
@adamralph
@adamralph
FINDING YOUR
SERVICE BOUNDARIES
— A PRACTICAL GUIDE

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Finding your service boundaries - a practical guide

Editor's Notes

  1. © 2003 Microsoft Corporation. All rights reserved. This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.
  2. © 2003 Microsoft Corporation. All rights reserved. This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.