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Properties

Property

Description

Decouple category

Front-end (4)

Complexity

Low

Related patterns/solutions

 

 

Summary

In dialogs many input validation rules are used. Some (input) validations will be defined within the domain layer and used within dialogs (interface layer), others are only defined and used within dialogs (e.g. correct birthday, telephone numbers, etc.). Validation rules defined within the domain layer will cause coupling between dialogs and business rules which will leads to many undesirable effects.

Context

Input validations and suport attributes.

 

  • op een plek definieren zodat onderhoud eenvoudig is. Weinig werkt.
  • Validatie service

 

 

Input validation

(front-end only)

Business rule validation

(defined in domain, also used in front-end)

Correct telephone numberX 
Correct birthdayX 
Policy X
   

 

 

 EigenschapOmschrijving
Kennis ontsluitingImplicit vs explicit call 
  
Truth maintenance 
Implementatie kenmerkenTestableFront-end and business rules are independently testable.
 MaintainableBusiness rules are easy to maintain. Front-end and domain logic are not intertwined.
 Out of the box 

Problem

Content of a value list changes more often compared to the application which uses the value list. Seperating application behaviour from maintenance of value list content which could be depend on external resources.

Solutions

Voor de oplossing wordt rekening gehouden met de kenmerken die benoemd zijn in de tabel onder "Context".

 

Er zijn verschillende oplossingen mogelijk waarbij de bovenstaande kenmerken in meer- of mindere mate gerealiseerd kunnen worden. Per geval dient de best passende oplossing te worden gekozen. In de tabel hieronder worden de belangrijkste eigenschappen getoond en hoe elke oplossing daarop scoort.

 

 Eigenschapsupport attributes   
KnowledgeImplicit vs explicit call    
     
     
Implementation
characteristic
     
     
     
     
     

Solution 1

 

Solution 2

 

Issues and considerations

 

Related patterns

 

 

 

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