From the course: Software Architecture: Patterns for Developers

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Layered

Layered

From the course: Software Architecture: Patterns for Developers

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Layered

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- [Instructor] The layered application pattern is a classic pattern that you'll encounter often in various forms. A layered application is an application that has several layers. Each layer has distinct responsibilities. The idea behind the layered application is that calls in the code flow downwards. A layer can call the layer below it, but not above it. There are five layers that occur often. The presentation layer contains the user interface. The application layer is the layer that receives calls from the UI and translates them into calls that the business layer can understand. The business layer contains all the business logic, and the persistence layer is where we put the code that knows how to interact with the database. Finally, the database is where we store the actual data. If necessary, you can add more layers, like a caching layer, for example, or in some scenarios, two layers can be merged into one. The layered architecture is well-known among many developers, and it's…

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