Layer (or abstraction level, or a layer of abstraction) is a way of hiding the implementation details of a particular set of functionality.
Questions tagged [layers]
187 questions
7
votes
4 answers
Processing a stream. Must layers be violated?
Theoretical situation:
One trillion foobars are stored in a text file (no fancy databases). Each foobar must have some business logic executed on it. A set of 1 trillion will not fit in memory so the data layer cannot return a big set to the…
Lord Tydus
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2
votes
2 answers
Where and how to handle Unique column constraints
I want a non-primary key column to be unique. This is enforced with a unique constraint. In a service endpoint I want to return a nice error message structured into a {field, messsage} object when unique constraints are violated. Currently I check…
Jakob
- 213
1
vote
1 answer
Can an outside component interact with lower layers directly in a strictly layered architecture
If we have a strictly layered architecture, can we allow outside components to interact directly with the lower layeres?
More specifically:
In my lower layers, I am providing a service, and in the top most layer I have a layer called Applications…
Moj
- 111
0
votes
1 answer
Understanding dependency inversion
According to the definition by Robert Martin, high level modules should not depend on low level modules, instead both should depend on abstractions.
So if I have a domain entity Invoice that uses an interface InvoiceRepository for persistence, and…
Hans
- 416