Questions tagged [interfaces]

Questions about interface related design considerations, such as programming to the interface.

30 questions with no upvoted or accepted answers
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Should an interface covariant on T ever implement an interface invariant on it?

I was reading through the Hacklang docs on Collections, and came across this curious definition [paraphrased slightly]: interface KeyedIterable<Tk, Tv> ... interface ConstVector<+Tv> ...
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46 views

Heterogeneous interface hierarchy

I'm working on a program that tests a digital circuit. The digital circuit can process accesses from multiple different caches, CACHE0, CACHE1, etc. The digital circuit can handle accesses to ...
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58 views

Entity Framework - Old school save/update advice?

I've a query for you relating to best use of EF6 when using Winforms yet not having justification for changing things to something more modern. I've got half a dozen classes that are based on ...
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0answers
120 views

Interface Methods vs Data Objects

Building a UI editor for Android and basically there are interfaces such as this: interface Item { fun decorate() fun translate(x: Int, y: Int) fun rotate(rotation: Float) fun scale(...
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0answers
402 views

What are the benefits of an input/output component design?

For the company I work at, all of our projects, including a new one started last year, are written in C89. We write for vxWorks (a real time embedded operation system). Our software runs multi-...
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0answers
206 views

Pattern or solution for using classes with different interface the same way

What I would like to achieve is to use classes (now two, later more) with different interface the same way, so I would like avoid using decisions based on the interface on upper levels for instance, I ...
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226 views

Designing a multithreaded TCP/UDP server for audio sharing

As briefly introduced in the question title, I am trying to design and implement a server application able to let clients share audio contents between themselves. In order to achieve that, I decided ...
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1answer
212 views

How to represent a specific type of interface dependency in component diagram?

I'm currently having a hard time with creating a component diagram that should represent a certain type of component/interface dependency and hope that you can give me some hints. As background, I ...
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0answers
25 views

How would I go about developing an interface that would allow integration of 6 other models?

I am new to programming, I have been trying to get my head around this. Context My project is about defining investment packages for various construction projects within a country based around an ...
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0answers
102 views

Can we break CQS to get some DRY?

In our codebase we have a lot of controllers with a very similar structure: @my_model.update_owner(something) if @my_model.update_attributes(params) return render_object(@my_model) else ...
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0answers
92 views

Receiving events through an interface

So I'm writing a game and using the Google Play Services framework to send and receive data. I have to implement the IRealTimeEventListener interface and override the functions below to receive ...
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104 views

Sending events down a tunnel, and bubbling them back up

I am working on developing an HTML canvas application, where I need to be able to do my own UI event processing. That's where the stem of this question comes from, but I'd really like to understand ...
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0answers
3k views

ASP.NET: Creating an interface for a controller

Would creating a controller's interface a bad idea? I have a controller that derived from ApiController, so knowing that you can only derived one class to a class but able to derived one or more ...
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174 views

Should I use RFC 2119 in interface documentation?

RFC 2119 defines several terms, including MUST, SHOULD, and MAY, for use in standards documents, particularly those relating to networking protocols such as IP and HTTP. These terms are widely used ...
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597 views

Class Interfaces with Multiple Classes and Dependency Injection

NOTE ON QUESTION TITLE: I did not really even know how to phrase the title so if someone can edit and make it more articulate I would really appreciate it. QUESTION: Basically, what I'm trying to do ...
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63 views

Adding new Interface & Replacing Method with Interface Type

Let's say that I have 2 classes: Foo and Bar. `Foo` { List<Bar> bars String bippy() int boop() } `Bar` { int biz() String baz() } Observe that Foo's fields include a List<Bar>. ...
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472 views

How far to go when future proofing fluent-method-chained-DSL test code?

Is it worth implementing interfaces, or using the getThis() trick, or even static factory methods to future proof against the need to extend this DSL? The current design is a pair of thin fluent-...
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1answer
564 views

How to figure out what interface to cast to?

This question may be a bit subjective, but I have tried three different solutions and none of them has felt right. I will provide some context and the solutions I have tried. The issue I am facing ...
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1answer
50 views

Avoiding downcasting in PHP

This is a theoretical problem that bothers me. Let's say we have following, simplified structure: interface ParagraphInterface {} interface ParagraphGroupInterface { public function ...
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0answers
57 views

Using virtual inheritance for an interface system based on abstract classes

I want to use a physics engine (like bullet or PhysX) in my program, however I want to hide the actual physics engine from it, so I can easily swap it out with another during run-time (e.g. switch ...
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17 views

Feedback: data model and interface design for scraper

I'm writing a pet project to scrape some websites, and write out results to HTML. Currently my data model and interfaces are: class Post: def __init__(self, title, description, images) ...
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29 views

Rely only on status or provide response explicitly? - SOA -

I am developing a set of SOA services where the backends (mainly stored procedures in the DB) sometimes return only status code as response (ex: an operation to cancel a ticket, the SP for this ...
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164 views

What is the meaning of the different interface types in Ian Sommervilles's Software Engineering?

Reading Ian Sommervilles's Software engineering, he mentiones there are following interfaces: Paramater interface: data or functions are passed from one component to another Shared memory interface: ...
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399 views

Using java interfaces to narrow the classes public interface

There is a lot of content on the web discussing if it is worth defining an interface if only one class implements it. The answers are mostly either "Yes, because you probably need to mock it anyways" ...
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162 views

Can I keep my code loosely coupled with public-facing enums?

I have some enums in a concrete API/library that will be publicly used by application projects. My problem here, is that I cannot write an interface to these enums (that I know of). I should have ...
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53 views

Restructuring similar interfaces to one unified design

In my project, I have several types of Web API controllers (and their corresponding services and repositories). When I started out, I made an interface of a generic type that would describe the basic ...
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71 views

What should I do with too much interfaces needed for a dialog

Let me start by doing a small summary of the changes we did in our code in the last year. We have a software (VERY big) that is used to visualize multiples underground networks, enter data in the ...
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1answer
568 views

Android, using a Fragment to hold/edit complex object, accesible from any Activity

I'll do my best to describe the problem, but I'm still very new to several concepts that I think this problem requires to be solved (namely interfaces and threads). I should preface this by saying ...
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2answers
1k views

Using interfaces as part of encapsulation

I'm creating interfaces for a number of our existing classes for mocking reasons. Many of these classes also have package scope methods as an attempt to give some level of encapsulation by ensuring ...
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1answer
174 views

Enable access to objects via Introduce Parameter Object or interface

I am working with multiple commands that are executed in order (and possibly have sub commands as well) which can be desribed like this: interface ICommand { void Execute(); } abstract class ...