Mark Pearl

General

Also called NTier Pattern

Layers are closed

When a request comes in to any give layer, that request must flow through each layer in order to get to the one below it.

Layers of isolation

If I make a change to one of the layers, I only have to update the contract with the layer below and no other layers. Components are bound to a specific layer

Examples of typical layers

  • Presentation Layer
  • Business Layer
  • Services Layer
  • Persistence Layer
  • Database Layer


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