Layer (or abstraction level, or a layer of abstraction) is a way of hiding the implementation details of a particular set of functionality.
6
votes
1answer
142 views
Relaxed architecture DAL or anemic BLL?
Particularly for the sake of unit testing, I'm trying to implement an application with a layered architecture. I'm coding in C# and using ASP.NET Web API for the service layer. I'm aiming at a 3-layer ...
0
votes
1answer
63 views
Best practices for internationalization in layered applications
I'm building a new application in JSE for which I want to support internationalization.
I've never built such an application. I'm looking for the best practices for internationalization. The ...
0
votes
0answers
18 views
Where to store authentication/authorization entities with respect to crosscuting concerns?
Can you explain me how and where to store authentication/authorization entities
in project structure.
For example I have 4 projects in my solution in Visual Studio:
SolutionName.WebApp
...
0
votes
1answer
44 views
Using static methods in layered architecture
In layered architecture does it matter where static methods go? Or is it the architect deciding this? For example can the DAL be static to cache records and perform smart data retrieval at the ...
0
votes
0answers
60 views
SQL/HQL in a Play framework controller and Service Layer pattern
I started using the Play Framework a couple of months ago. It "redefines" many conventions from the traditional Java world (like the way of using static methods among other things). I was browsing the ...
2
votes
1answer
36 views
Save Two Different Domain Objects in One Service Call
Think that when one Branch saved, a Customer entity must created in n tier layered system architecture. All validation has already implemented in CustomerService.
Should BranchService create ...
0
votes
0answers
49 views
Layer application and token authentication
Suppose we have an application with multiple layers in .Net:
Domain layer (entities)
Data access layer (entity framework)
Business layer
Web Services layer (Web Api)
Presentation layer (MVC)
Now I ...
0
votes
1answer
41 views
Integrating Logging Library into multilayer Object: What is a good structure?
I am integrating Serilog into and existing multilayer library that I've create. The previous logging technique I used was simply passing a string up the layers with events. I'd like to get away from ...
0
votes
0answers
39 views
Code architecture for separate apps facilitating the same process
So I am at a cross roads with deciding on my integration strategy for a few of our business apps that play a role in a larger process. Being the only developer and never having to do this before leads ...
6
votes
1answer
214 views
MVC - Do I create 'joint' layers when dealing with multiple models?
I'm new to MVC and the different layers architecture and this is what I have currently:
2 models: User, Company
2 service layers: UserService, CompanyService
2 interfaces which abstract the ...
0
votes
0answers
125 views
Is this approach scalable?
I am working to rewrite a legacy application (C++) to C# ASP.NET MVC with EF6 but plan to upgrade to ASP.NET Core1 and EF Core 1.
The database schema is really arcane in that it has a single schema ...
5
votes
1answer
96 views
Choosing between Dependency Inversion and Dependency “Delegation” to a third module
Suppose I have MasterPackage containing a Master class, and BlasterPackage containing Blaster class. Since Master needs a Blaster to work, the higher level MasterPackage depends directly on ...
4
votes
1answer
82 views
Testing of a layered software architecture
I am currently building an application with a layered architecture in C. Currently, I have built and tested the bottom layer, which is a networking module, providing functionality such as ...
8
votes
3answers
733 views
Implementing a complexity hiding layer
As part of the dependencies that the project I'm working on has, we use several core services. These services, to which we can't make big changes, are a big mess. Depending on the method we invoke, we ...
1
vote
1answer
31 views
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 ...
0
votes
2answers
213 views
In AngularJS - should $resource be used from controller or service?
All the documentation, examples and tutorials I've found on $resource were using it directly in the controller. So far I'm just using $http from services and those services are further used in the ...
2
votes
0answers
136 views
Refactoring to avoid circular references
I'm working on an ASP.NET MVC solution that has two projects, WebUI and DAL. WebUI references DAL. DAL has the repository and context, while WebUI contains Authentication and Authorization classes.
...
5
votes
2answers
208 views
Where should business logic go in a layered architecture?
First of all, i'm not talking about validation in the sense of the nullability or length of a field like in this and this questions where we can use isValid() methods in business classes or an ...
3
votes
3answers
160 views
Abstracton layer to control services access to denormalized db entity
Our db is optimized for minimum join count (partially denormalized). E.g. our User entity contains account data (nickname, facebook id, etc), user numerical statistics (total games played, total wins, ...
0
votes
0answers
48 views
Abstracting AutoLayout sensibly - why is this so conceptually tough and where should I begin?
Below are some babbling, probably incoherent thoughts, but I am so stuck on this problem and I feel like an elegant solution is possible.
Though it is indisputably awesome, and makes programatic view ...
3
votes
1answer
373 views
OOP - How to refactor a “pyramid architecture”
Unbeknownst to me while I was building it, I built a "pyramid" architecture. I did not realize this until I laid it out in my new Visual Studio 2013 Layer Diagrammer. Each layer depends on the layer ...
1
vote
2answers
167 views
Do web applications use HTTP as a transport layer, or do they count as an integral part of the HTTP server?
Given an HTTP server (e.g. Apache, IIS) and a web application (user code running in the server using PHP, ASP.NET and the likes), which of those can decide which HTTP status code to return for any ...
4
votes
3answers
977 views
DDD, modularizing the application and domain layers without breaking the DIP
Quoting DDD theory:
The application layer is thin in terms of domain logic - it merely
coordinates the domain layer objects to perform the actual work.
When it comes to modularization, and ...
3
votes
4answers
258 views
N-Layer architecture
I am attempting to structure my solution projects in such a manner as to improve testing, reuseability, separation of concerns and all that good stuff. Whilst I understand these concepts in theory, I ...
3
votes
6answers
1k views
Domain Model, validation, and pushing errors to the model
Looking into DDD and something I noticed is that business logic should be in the model, otherwise you just have property bags. That said how do you handle pieces of validation that require a trip to ...
0
votes
2answers
116 views
What layers reference each other in a multi layer design? [duplicate]
I'm creating a project and I'm having difficulty and contrasting opinions on how to do things when it comes down to separating layers. I'm not fully sure what layers should reference each other.
I ...
1
vote
2answers
253 views
Where should the “not empty field” validation code be written on a 3-layer application?
When working with the 3-layer model, where should the validation code be placed? for: not empty fields, unchecked options, null values, wrong-written dates, etc.
To keep total isolation between a ...
0
votes
3answers
1k views
Business Logic vs Presentation/View Logic
I often question myself of where to put the logic that organize the data to a view that is not necessarily a business logic in a 3-layered architecture (DAO, Business, View).
I'll put an example to ...
1
vote
1answer
211 views
Confused about layered application development
So, for the first big project that I'm getting paid for, I decided I'd do things right.
To that end, I've created several projects in my Solution. Some of these projects are generic and handle common ...
0
votes
2answers
288 views
Can a layer consist of multiple projects / dlls?
I am working on the architecture for a new web application and I am pretty much a complete newbie when it comes to architecture. Working my way through .NET Application Architecture Guide, 2nd Edition ...
2
votes
1answer
105 views
How to handle errors best addressed in a higher abstraction layer and dependent on state inferred in current layer?
I have a use-case that can be repaired, but the logic for repairing it is best done in a higher level of abstraction. Just throwing exception/failure is ugly because it's hard to pass back up through ...
3
votes
1answer
196 views
Where do utility libraries fit in a layered architecture?
Consider this mock-up of a software stack designed with layered architecture in mind :
Every application layer is decoupled through API calls, but a memory handling library is used throughout. All ...
1
vote
1answer
318 views
Lazy Loading, DAL and BLL abstraction
I'm asking myself a question to code the right way on a new fresh project.
I have a designed database and I mapped tables to equivalent POCO classes using Entity Framework 6 Code First.
Then, I ...
4
votes
2answers
367 views
What are the advantages of strictly maintaining separate data | algorithm | interface layers?
I always separate the user interface from other functionality in my programs - its the way I have been taught, and it has obvious advantages since you can change the interface but keep the same ...
3
votes
2answers
204 views
Best practice for security checks, in surface or deep layer? [closed]
Let's take a server-side WebServices app, we need to make sure that all function applies every security rules, and keep the code clean.
In such a case, I usually prefer to place my security checks on ...
1
vote
1answer
134 views
Data Access Layer for application
I am working on a retail application where currently I'm using raw SQL like
insert into some_table values (Textbox1.Text, Textbox2.Text, ...)
and
update some_table set some_column = value
for ...
1
vote
1answer
414 views
Where does non-MVVM code belong in an MVVM app?
By non-MVVM code, I mean things like highly generalized components, like one with common extension methods for CLR types, and other 'homeless' helper classes etc? I have a Core project that most ...
2
votes
3answers
3k views
What is an “abstraction layer”?
I need a very simple explanation because I'm not a professional programmer.
I found the terminology "abstraction layer" reading the documentation of mysqli extension where is described the difference ...
2
votes
3answers
1k views
DAL vs BLL functions' return types
Here is how I see the main differences between the DAL and the BLL:
The DAL directly query the database.
The DAL doesn't create new information. It may execute complex sql requests, joining several ...
5
votes
1answer
241 views
How to avoid dragging arguments from function to function
When I do my code layout, I like to start with a rather high level view, and then start to delegate actual computation to class or functions that have a bit more detail. Then in these classes of ...
211
votes
11answers
60k views
How accurate is “Business logic should be in a service, not in a model”?
Situation
Earlier this evening I gave an answer to a question on StackOverflow.
The question:
Editing of an existing object should be done in repository layer or in service?
For example ...
6
votes
2answers
677 views
Is programming in layers real? [duplicate]
I am fairly new in product development and I am trying to work over a product. The problem that I have realized is that people draw diagrams and charts showing different modules and layers.
But as I ...
0
votes
1answer
142 views
Layer style applied, but intuition is different
Currently, I'm developing an architecture for a system of the following kind:
There are a couple of existing applications (front end) with which one can define UML profiles capturing some specific ...
0
votes
3answers
498 views
How do I create a simple yet complex business layer?
I'm working with a fairly complex web application. It's split up into the following layers:
Presentation - HTML
Service layer - A REST and SOAP API communicating with the business layer
Business ...
2
votes
3answers
136 views
Efficiently “moving” data upward through a communication stack
I have implemented an application protocol stack that moves an incoming stream of data upward through several layers, as follows:
copies a TCP segment from an OS buffer to my_buffer.
after ...
2
votes
3answers
1k views
Which layer does async code belong?
I am developing an application that consumes data from an external service. The application is being implemented following a typical layered architecture with UI, Presentation, Domain and Data ...
0
votes
1answer
949 views
Trying to understand 3 layer programming [closed]
I am confused to understand the structure of a 3 layer programm. Where is good place for exceptions, entity and etc.? If I use MVC, in my UI model, how to transfer entity class to model class and ...
61
votes
13answers
6k views
Why is it a good idea for “lower” application layers not to be aware of “higher” ones?
In a typical (well-designed) MVC web app, the database is not aware of the model code, the model code is not aware of the controller code, and the controller code is not aware of the view code. (I ...
3
votes
1answer
326 views
Why doesn't layered architecture translate easily to tiered architecture?
Basically, I'm trying to understand why layered and tiered are that different, and why they don't translate easily to each other.
I understand that layered could be 3 separate class files for UI, BL ...
5
votes
4answers
283 views
Large teams with layered application
I work in a fairly large team (~15 developers) which is currently discussing our working methodology. The software we work on is quite feature-rich and expanding rapidly in terms of scope so the ...
