Questions tagged [layers]
Layer (or abstraction level, or a layer of abstraction) is a way of hiding the implementation details of a particular set of functionality.
144
questions
4
votes
2answers
416 views
Domain vs Entities model? Domain-Driven-Design (DDD)?
In this github, https://github.com/johnph/simple-transaction, under the Transaction.Framework project, there are entities (located at Data/Entities)
AccountSummaryEntity.cs
AccountTransactionEntity
...
5
votes
1answer
149 views
Is My Data Access Layer Really My Domain?
I'm not an architect, but am trying to put together a diagram which represents the architecture of the application which I am maintaining.
I have one question (but welcome any comments about the ...
-1
votes
1answer
55 views
How shall I implement a MVC program into presentation, business logic and data access layers?
Here is part of an ASP.NET MVC program, from https://docs.microsoft.com/en-us/aspnet/core/tutorials/first-mvc-app/controller-methods-views?view=aspnetcore-3.1 :
A model class Movie:
public class ...
0
votes
0answers
41 views
Layered Model-View-ViewModel design
I am designing an application using C# and Windows Presentation Foundation (WPF). I would like to follow (at least) the very basic rules of software architecture, like dependicies only going in one ...
2
votes
2answers
75 views
Mantain same entity data in different layers
I'm trying to split the use of a business entity (e.g. a post) thought an application uses, trying to obtain a clean architecture
So I will likely have:
A class model, where the business logic lives
...
1
vote
1answer
137 views
What should I name this area of my architecture?
I am developing an architecture for a new MVC system. The legacy system has a layer it calls "facade", but it is not the classic GoF Facade. It is more like a service aggregator. It is used as a ...
1
vote
2answers
132 views
Unit Testing business logic layer that depends on data access layer [duplicate]
a discussion that rose among us devs: how to do unit test of Business logic layer that depends on data access layer. the two options are
create test data in a test database (for example, H2). let the ...
1
vote
2answers
100 views
which layer must check if something(like account etc) exist in database
I am implementing a web api and i have crated three layers,data access layer,business layer and presentation layer.
In data access layer I have a method which create a user.I use a transaction which ...
2
votes
2answers
92 views
Where should objects be built from view-models in a layered architecture?
Having the following classes:
Person.cs
namespace Project.Domain
{
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public decimal ...
-3
votes
1answer
67 views
Packaging of a web application code-base [closed]
Michael Nygard writes in Release It!:
Have you ever checked in a commit that had bunch of new files like "Foo", "FooController", "FooFragment", "FooMapper", "FooDTO", and so on? That is evidence of ...
1
vote
2answers
120 views
Check permissions on top layer before going deeper
I'm building a four layer simple architecture with the following layers:
Controller
Actions and Events
Repositories, that returns single entities or collections
Models, where the SQL code resides
...
0
votes
0answers
99 views
Is ASP.NET Core Identity a leaky abstraction?
As far as I know, the DBContext or underlying persistance technology should be only contained inside the Data layer.
Also, it feels very wrong to me to have identity package inside the user ...
3
votes
0answers
42 views
Scalable QT/ C++ Architecture advice
I am working on software which supports different hardware device generations. With each software release all device generations are supported, what means that each device generation is also tested.
...
1
vote
1answer
63 views
Message passing interface between protocol layers
Let's imagine a custom network application having 3 protocol layers.
Layer A is the top-level protocol and layer C is the lower level protocol. Each layer has its distinct functionalities. These ...
3
votes
0answers
90 views
Understanding layered architecture: are these layers in a Nestjs application really decoupled?
I'm creating a new project usin Nestjs, which I'm really starting to like. I cannot figure out though, what the right way is for separating Business layer and Application layer.
Following the ...
1
vote
4answers
824 views
Which layer do DDD Repositories belong to?
In his DDD book Evans promotes the idea of layered architecture, and in particular that the business logic should be confined to domain layer and separated from UI/persistence/other concerns. He also ...
0
votes
1answer
42 views
Questions about Direct access to data source from Services
Background:
I'm trying to separate my concerns in the application architecture the best possible way.
In a nutshell:
The requests are parsed and go to an Action
Action decides which service(s) to ...
2
votes
1answer
289 views
Two-level concepts
I find myself lately implementing the same concept twice, once at a low level and once at a higher level. Let me see if I can explain it...
For example, given the notion of a database, I have one ...
0
votes
1answer
62 views
Generic crud with jdbc api
I am used to programming java on the server side with ORM frameworks and using abstract classes for CRUD. But now I'm workign on a desktop project without ORM and just the good old JDBC API for ...
0
votes
1answer
91 views
Communication between separated application parts
I have searched well before asking this question, and some of the questions look like what I need here, but none of the gave a clear answer to my question.
I am writing a web application (in PHP if ...
12
votes
4answers
622 views
Is it problematic to have a dependency between objects of the same layer in a layered software architecture?
Considering a medium-big software with an n-layer architecture and dependency injection, I am comfortable to say that an object belonging to a layer can depend on objects from lower layers but never ...
0
votes
1answer
310 views
How to properly decouple the service layer from the user interface layer, if the service layer needs to interact with the user?
In my program, I have a long-running function from which I would like to interact with the user for various reasons:
Giving status updates ("Downloading file /foo/bar.png")
Displaying warnings ("File ...
1
vote
1answer
52 views
Adding Security Layer for multiple services
My web application at the moment accepts REST requests and handled via some controllers, which calls corresponding services to perform the logic.
Now I want to add in some security logic before ...
3
votes
3answers
3k views
Business Logic Entities and Data Access Layer Entities
I am thinking on how to structure a project. I wonder if it is a good practice to use different entity classes between the BL and DAL in order to decouple these layers.
I have worked on projects ...
2
votes
0answers
246 views
N-Tier/Layered Architecture with MVC
Do N-Tier/Layered architecture really helpful with MVC? I have some projects here that use N-Tier architecture with MVC.
The available layers are
Entity Layer
Data Layer
Business Layer
Presentation ...
1
vote
1answer
118 views
How should we approach layered-architectures that need large amounts of continuous, real-time, communication?
Background
In much of the literature I've read online with respect to multi-layered architectures, many people describe how to create the simple application where:
UI presents static model objects ...
-2
votes
1answer
464 views
Consuming Rest, DAO or Service layer?
I feel like this is a dumb question but here it goes:
If i'm consuming rest (getting data and transforming in POJO), does it sit in the DAO or Service layer?
As for what i've researched I believe that ...
0
votes
1answer
48 views
Function for processing files: Business Layer, Service Layer, or anything else?
I read that Repositories should not refer to other repositories. I have a method ProcessFile that refers to multiple repositories, it parses a file, and inserts into many table models in different ...
4
votes
1answer
247 views
In an asp.net mvc application, can I use Entity layer as Model?
I am developing an asp.net mvc solution, which contains the three layers:
Data Access Layer
Business Layer
Entity Layer
Each layer is a project.
I have developed the controllers and views, but no ...
0
votes
0answers
257 views
Clarification on the Onion architecture's Domain Service and Application Service
I am studying Onion Architeture but i got some doubts:
All the samples (github) I found over internet are too simple, or are implemented under DDD (which I have not studied at the moment) so I can ...
1
vote
1answer
336 views
Where to convert int to enum in a 3-tier architecture?
I have a situation where a DB field is storing an enumeration value whose underlying type is int, so I'm getting back values like 0, 1, and 2, which should represent MyEnum.Foo, MyEnum.Bar, and MyEnum....
1
vote
1answer
104 views
Software layers and data mapping
Before I would ask my question, here is the context: I am working on one part of a relatively big software. In its simplest form there are 3 layers of the software lets call them lower layer, middle ...
0
votes
1answer
305 views
Why are the Android runtime and native libraries in the same layer?
Regarding the diagram in Android's website: https://developer.android.com/guide/platform
Why did they put the Android Runtime category in the same layer as the native C/C++ libraries category. ...
2
votes
2answers
258 views
How to correctly split a monolith and rely on the same domain
Context
I'm developing a Spring Boot java application. Currently it is a monolith with the rest API and the front end (vaadin driven) in the same big project.
Although this is very easy to develop ...
2
votes
1answer
528 views
DDD: Should create domain model for complex application layer?
I'm midway through Eric Evans' DDD book but don't think this question would be answered in the book.
If an application has its own complicated concepts different from the underlying domain, can we ...
1
vote
1answer
186 views
Data transfer between modules (layers)
I'm creating an application that is composed using different modules (core, course, grades, news). I'm using clean architecture for the different modules but I'm stuck trying to pass data from one ...
4
votes
3answers
209 views
Does Presentation Logic constrain design of Business layer?
We have an email plugin which encrypts a mail's attachments when the user sends an email and gives the mail's recipients permissions to decrypt the attachments. The recipient permissions are stored on ...
2
votes
2answers
335 views
Disadvantageous of using entity framework layer directly into presentation layer (ASP.NET MVC) by skipping Service layer
In my company, We are planning to build more than one web application on a single Database. The proposed design of each of these apps are -
ASP.NET MVC as Presentation layer, Restful API as service ...
2
votes
1answer
100 views
Decouple service complex query building from datastore
We have a very large search service (written in golang if it matters) that runs on top of ElasticSearch, receive requests, builds the correspondent query, and returns the results (with some post-...
2
votes
1answer
73 views
Cross Entity Action Implementation
I have a domain layer, which my application architecture holds "sacred"; that is to say, the domain layer has no references to either data storage, or presentation concerns (vice-versa is allowed). I ...
2
votes
3answers
1k views
Does layered architecture still to be implemented inside all other architecture pattern like SOA and Microservices?
When we design the whole system we have few architecture pattern to select from. One of them is the layered architecture pattern, This pattern seems to be generic enough to fit in all other ...
4
votes
2answers
629 views
How is layer between MVC controller and back-end called?
I have ASP.NET MVC application with the following controller and action:
public class AccountsController
{
public ActionResult Index()
{
var accounts = _accountsManager.GetAccounts();...
-2
votes
1answer
71 views
What to call a API and DB code layer [closed]
In a recent MVVM mobile app project I wrote a set of API classes and Database classes where there was a clear flow of logic between both api and db code. To enforce the way api and db interacted I ...
0
votes
2answers
631 views
Multiple layers of abstraction and chain calls of methods (Java functional like programming)
I am creating a multiple wrappers/layers API in Java that go like this
public class Layer1<T extends Layer1>
public class Layer2<T extends Layer2> extends Layer1<Layer2>
public ...
1
vote
2answers
695 views
A way to keep object between layers decoupled?
I think this is a common design problem, but I keep scratching my head every time I face it.
On one side, we have our API which sends or receives simple structures aimed to be consumed by web apps, ...
0
votes
2answers
290 views
Where to put code for XML Deserialization: Business Logic Layer or Data Access Layer?
I have a web application (ASP.NET Core / C#) with 3 layers (web/presentation, business logic and data access).
I'm using Entity Framework to retrieve a record from an SQL Server database which is ...
3
votes
3answers
957 views
An alternative to a 3-layer-architecture?
At work, a 3-layer-architecture is the go to whenever a web application is needed.
I don't mind this, but many of the applications we start, do not seem to have an initial need for this. These ...
1
vote
1answer
6k views
What is the best way to get a list of Business objects from a list of entities?
I am using entity framework to get a IEnumerable<CustomersEntity>, and I need to cast this to a IEnumerable<CustomerBO> to display it in some view. I know how to do cast a IEnumerable<...
0
votes
1answer
65 views
What is the correct way to design a model and its relations?
I have the following database models and its properties:
User (id, role_id, name, email, password)
Role (id, name, description, active)
User2Role (user_id, role_id)
Customer (id, name, user_id)
A ...
2
votes
2answers
2k views
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 ...
