N Tiering

NTiering A guide to N-Tier application design

NTiering A guide to N-Tier application design Badly Drawn Bob, NTiering logo

The Good Old Days ,[object Object],[object Object],[object Object]

Nowadays ! ,[object Object],[object Object],[object Object]

What is N-Tier? ,[object Object],[object Object],[object Object]

Advantages ,[object Object],[object Object],[object Object]

What does it look like? ,[object Object],UI Service Data

What does it look like? ,[object Object],UI Service Data DTO / Common Classes

What does it look like? ,[object Object],UI Service Data DTO / Common Classes Using a common class to Move data means the UI Layer is coupled to the data layer

What does it look like? ,[object Object],UI Service Data Validation Validation Validation

What does it look like? ,[object Object],UI Service Data Validation Validation Validation Repeated validation is the single most common mistake in n-tier apps. Not only does this duplicate effort, but What happens if the validation changes on the data layer but not in the UI

How does NTiering fix this? ,[object Object],[object Object],[object Object]

What does NTiering look like? ,[object Object],UI Service Data

What does NTiering look like? ,[object Object],UI Ntiering. UIExample Service Ntierning. Service Data Ntierning. Data

What does NTiering look like? ,[object Object],UI Ntiering. UIExample Service Ntierning. Service Data Ntierning. Data Models DTO's Customer Service Order Service

What does NTiering look like? ,[object Object],UI Ntiering. UIExample Service Ntierning. Service Data NTierning.Data Models DTO's Customer Service Order Service Models invoke validation using Services, allowing new UI's To be developed Add new services without impact to existing application No longer tied to one database provider Change UI easily. Business logic is in the service layer

What does it cost ? ,[object Object],[object Object],[object Object],[object Object]

N Tiering

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