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Create a free Team What is Teams? Learn more. Application layer vs domain layer? Ask Question. Asked 9 years, 9 months ago. Active 1 year, 8 months ago. Viewed 84k times. Improve this question. Louis Rhys Louis Rhys 5, 11 11 gold badges 39 39 silver badges 57 57 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Travis Parks Travis Parks 2, 1 1 gold badge 16 16 silver badges 23 23 bronze badges. I don't think what you state here is correct: " However, something has to translate UI-specific values query strings, POST data, session, etc.

This is where the application layer comes into play". What you are referring is in DDD's terms the "Presentation" layer. The Application Layer is supposed to deal with plumbing, concurrency and cross-cutting concerns, being just a tiny wrapper over the Domain Layer.

What you are describing would correspond to a sub layer in the Presentation Layer. Taking from Martin Fowler's patterns of enterprise design, the most common layers are: Presentation - these are views, presentation templates which generate the interaction interface for your application I am using interaction in case your application is accessed by other systems through web services or RMI so may not be a user interface. Domain - this is where your business rules and logic resides, your domain models are defined etc Data Source - this is the data mapping layer ORM and data source database, file system etc How do you draw the boundaries between the three layers: Do not put presentation specific logic within your models or domain objects Do not put logic within your pages and controllers, i.

Stefan Falk 3 3 silver badges 17 17 bronze badges. For example , my financial software application has a user operation for changing the state of a model entity entity as defined in DDD [89] : "The Chief of operations can approve a financial proposal".

Notes: Business is one of those words that frequently lead to multiple interpretations of it's meaning but for sure you can find lots of examples and talk-about in DDD; DDD stands for Domain-Driven Design book by Eric Evans and number inside square brackets for page number.

Sebastian Patten 4 4 bronze badges. Application Layer and Domain Layer both comes under the scope of implementation. Application Layer is acts as API. Premraj Premraj 8 8 silver badges 17 17 bronze badges. I feel enlightened — Nikos. I like this. Premraj could you provide reference? At least in literature such as Domain-Driven Design Evans , it is acknowledged that the layers have a one-way dependency UI depends on Application, but not vice-versa. Application depends on Domain, but not vice-verse.

Domain on Infrastructure, not vice-versa. Dependency is about how your programming, the isolation layer is about how you design you system layers. One way dependency does not broke the isolation concept here, because when you programming, the top layer code should dependent on the interface of lower layer rather than the implementation classes. That's great and all on paper, but in practice, business requirements result in changes that can affect the interface of the application layer in such a way that changes bubble up through the presentation layer, and sometimes down to the storage layer.

That is all I was getting at Isolation layer design does not mean no changes allowed in the future. Contrary, it makes the changes much more easier -- easier to test and easier to estimate the works. Yes, a new business requirement means you may need to change from the top to the bottom, isn't it the way how you implemented the existing function before?

If you can design each layer based on SOLID principles, then you may found that you can just reuse existing functions from the bottom layer. The ultimate goal is to make your code as easy to maintain as possible. Charles Lambert Charles Lambert 2, 17 17 silver badges 18 18 bronze badges. Moderne Technologien begeistern uns. Diese Expertise und Begeisterung teilen wir gerne mit euch!

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