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

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2
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2answers
83 views

How do you maintain protocol of function return value in dynamic language?

In dynamic programming language like Python, Javascript, it's very easy to make a function return an object: def make_vector2(a, b): return {"x": a, "y": b} The 'signature' of the returned ...
2
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1answer
100 views

Is Dependency Inversion a valid alternative to the pImpl idiom?

If I want to present to the user of my code an interface, that is unlikely to change, I can write only the public part of the classes in public headers and have a single private pointer to another ...
0
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2answers
131 views

Should I extend an interface or keep it independent?

I'm trying to decide whether to extend a base interface with additional methods or create several independent interfaces. I have a Task interface that looks like this interface Task { public ...
2
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2answers
99 views

Delegating work and programming to component interfaces

I have a MessageHandler class which receives and validates messages before determining which components in the architecture they should be delegated to so they can be processed. This involves calling ...
8
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2answers
1k views

Is using interfaces for datatypes an anti-pattern?

Suppose I have a various entities in my model (using EF), say User, Product, Invoice and Order. I am writing a user control that can can print the summaries of entity objects in my application where ...
3
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5answers
605 views

Implement multiple separate interfaces or interface hierarchy

I've been refactoring one of my projects recently and ran into a decision I have to make. I have several interfaces: Entity: Something in the game world Actor: An Entity that can perform actions ...
2
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2answers
242 views

When to use a SortedMap interface?

The rule in programming is to use the most general interface possible. But the difference between Map and SortedMap is more subtle. They compile to the same bytecode [I think] No additional safety ...
2
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2answers
123 views

Are single method interface and function type definition the same?

In a language where it is possible to define interfaces and typedefs (using Dart here): abstract class Receiver { void receive(int quantity); } typedef void Receive(int quantity); abstract class ...
2
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2answers
73 views

Interface design - Parameter choice

Situation: Is it better to have one or few parameters that supply more than enough information for the intended process or should you have more specific parameters that provide just enough ...
1
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1answer
45 views

Do my “dal” and “fileHandler” interfaces overlap?

I want my program to: read some input lines from CSV file write the output lines to plain string file read some input from the same file in (2) and compare it to some calculated data I want to ...
7
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5answers
395 views

Should private functions be held to the same standards as public functions?

If I'm building private utility functions, should they be held to the same rigorous standards in terms of handling invalid data as public functions? Example:If I'm writing code to calculate the ...
0
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1answer
70 views

Implementing an interface already implemented by a parent class?

If a class extends a parent which defines an interface, should that class also explicitly implement the interface? As an example, is it better to include or remove the portion in square brackets ...
1
vote
1answer
75 views

Documentation of interfaces

I know how to document a function: /** * Prints a greet message to the web page */ function greet() { echo "Hi!"; } Or describe the usage of a variable: /** * @type string $name The user's ...
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4answers
235 views

How should nodes in a chain be connected?

Suppose you were building a system that receives data on one end and sends filtered data on the other end. The system is a chain of nodes, each receiving data from the node before and sending ...
0
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1answer
213 views

Interface or boolean?

I have a CustomObject class which has the abilities like being Clickable, KeyPressable and Movable. I created interfaces: IClickable, IKeyPressable and IMovable and make different CustomObject classes ...
5
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2answers
160 views

Is it good design to put abstract methods in an abstract class even though the methods are already defined in its interface?

Let's say we have an interface Foo with a method "public void someMethod()", and we have one or multiple abstract classes that "implement" Foo but don't necessarily themselves provide an ...
16
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4answers
2k views

Should a front-end developer ever specify JSON format for back-end developers?

I am taking the front-end role in a project. Should I be specifying for my back-end teammates the exact format of JSON that their PHP returns to my JavaScript? For example, should I be telling them ...
1
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0answers
73 views

How does one enforce the implementation of a static method? [duplicate]

Of course the answer to the question above is, "you can't". But I didn't have a better way of describing what I'm looking for. If I did, I wouldn't be asking this question. My problem stems from a C# ...
1
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0answers
42 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>. ...
4
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3answers
323 views

Why use arg type `class Object` instead of `Comparable[]`?

In the code below, I believe it would look more appropriate to make the method argument be of type Comparable[] instead of Object[]. The first reason it would be more appropriate is that one can be ...
0
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2answers
211 views

Develop GUI and logic in a team the right way? [closed]

I am planning to start a small project with a friend. I will be developing the GUI using JavaFX in the MVC pattern and he will be responsible for the model/logic. My question is: how can we achieve a ...
0
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1answer
65 views

Interfaces between multiple projects

I'm slightly confused over the following: ProjectA -------- GetUsers (Implements IDBConnector) -------- IGetUsers -------- UserModel ProjectB -------- Main I have two projects one main project ...
1
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1answer
62 views

Do the implementations of the Node interface in Web API violate Liskov Substitution Principle?

MDN article on Node interface states that interfaces [that inherit from Node interface] may return null in particular cases where the methods and properties are not relevant. They may throw an ...
0
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1answer
134 views

Async properties in interfaces to cater for the possibility of expensive first-time evaluation: Is this a good idea?

First of all, sorry if this post is too long. I'll start with the… Short version: Is it generally advisable or a good idea to design an interface property as asynchronous simply because we cannot be ...
0
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4answers
2k views

Why 'List<E>' is an 'interface' but not 'abstract class'?

Amidst defining the hierarchy, firstly, one can think to embed the abstract method(behavior) in abstract class only because the derive concrete class possess that behavior as core behavior with it's ...
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2answers
393 views

Programming against interfaces in Java

Supposing I have an interface Foo and a given implementation FooImpl. public class FooImpl implements Foo If I want to define a new operation on this class that depends on the particular ...
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2answers
157 views

Cleanest choice for symmetric operations

I have a need to do some processing from a format A to a format B and from B to A. The job in one direction is very similar to its counterpart. Both formats are represented with an interface Msg. In ...
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0answers
32 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 ...
11
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4answers
2k views

Is it permissible to use explicit interface implementation to hide members in C#?

I understand how to work with interfaces and explicit interface implementation in C#, but I was wondering if it's considered bad form to hide away certain members that would not be used frequently. ...
2
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4answers
234 views

Determining a class structure

I'm currently in the early stages of designing an e-commerce application. I'm working out some designs for my classes which have so far been fairly straightforward, but I've run into something of a ...
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3answers
291 views

Implements > extends, but what about variables?

It's preferable to write programs that depend on interfaces rather than on superclasses, but what when you want a class to have certain variables? Sometimes you want a class to implement a certain ...
0
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1answer
108 views

when would you wrap a service object with an interface? [duplicate]

I'm new to UT and some of the best practices and anti-patterns when writing testable code, made me think. I used to wrap any service object with interface. but I see many mocking frameworks can ...
14
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2answers
2k views

Illegal in PHP: Is there an OOP design reason?

The below interface inheritance is illegal in PHP, but I think it would be fairly useful in real life. Is there an actual antipattern or documented problem with the below design, that PHP is ...
3
votes
1answer
279 views

Trying to get a better understanding of Interfaces

Im working on a small program and I thought i would use it as a chance to get a better understanding of things I haven't really used before, mainly Interfaces and Inheritance from base classes. ...
4
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1answer
160 views

Handling interface segregation in C++

I'm designing a "view" handling system for a game. The goal is to be able to have different "views" that can be shown in sequence or stacked on-top of each other. For example, the initial splash ...
3
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4answers
1k views

How to force “program to an interface” without using a java Interface in java 1.6

In java 1.8 they have wonderful new "default interface methods". In 1.6 how close can we come? The goal: use code to keep clients from being able to tell that a class is not a java interface. If we ...
1
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1answer
316 views

Static methods vs Interface implementation

Here is my problem: I stared to create an e-commerce web site info collector. So I created a parser for each site. The parser class is stateless. I have got methods like: getItemPrice(WebElement ...
3
votes
3answers
226 views

Should I denote that a method satisfies an interface?

When writing a class which has ("satisfies") 1 or more interfaces, should I note somehow (e.g. in an XML comment, or with an attribute) that a particular method was added for one of the interfaces? ...
0
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1answer
243 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 ...
0
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2answers
144 views

How to organise and label methods, intended for debug?

I have a class System, which uses a bunch of other classes, to achieve a complex signal processing. In debugging System, one needs to observe the output signal for patterns. This is not achievable by ...
5
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3answers
264 views

Does it make sense to split up an existing multi-method interface into several single method interfaces just to take advantage of lambdas?

Say I have an existing callback interface that has multiple methods. To illustrate my point I use a callback the likes that you would see in code that performs some HTTP client operations: public ...
1
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0answers
208 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 ...
0
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2answers
99 views

Possible design patterns for base function with possible additions

I have various interfaces i have to implement. Let's assume ITypeA, ITypeB. They have following methods: ITypeA Connect Disconnect GetData SetData ClearData ITypeB Connect Disconnect ...
3
votes
2answers
223 views

Are there alternatives to using an optional type in a multithreaded environment?

I'm making an MPMC queue in C++, and I would like to find out what the best interface for a try_dequeue method would be (I'm not concerned about its implementation). I'd like to provide a method which ...
23
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8answers
2k views

Interface design where functions need to be called in a specific sequence

The task is to configure a piece of hardware within the device, according to some input specification. This should be achieved as follows: 1) Collect the configuration information. This can happen at ...
0
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1answer
124 views

Prepared statement alternatives for this middle-man program?

I have an program that is using a prepared statement to connect and write to a database working nicely, and now need to create a middle-man program to insert between this program and the database. ...
0
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1answer
184 views

How to generalize a classes that has identical function plus some additional function

I have some designing problems with my project. To illustrate my problem, I'll use the following two classes from my project. public class RAM_UserManagement{ private Map<int,User> userList; ...
4
votes
1answer
660 views

Traits, Inheritance and Interfaces in Groovy, when to use them?

I'm learning groovy and I've just learned about the new feature added in 2.3, which is the addition of Traits. Now to me it seems like Traits allow you to do basically everything a super-class and an ...
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3answers
986 views

Make Return Type an Interface - Problem with Initialization

I would like to make the return type of my method an interface rather than a class for similar reasons stated in c# List or IList, however I am having trouble figuring out how to initialize the ...
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4answers
858 views

Should I put extension methods of an interface in the interface.cs file?

Imagine this set up: public interface IMass{ double Mass {get;} } public static class IMassExtension { public static double ToKg(this IMass massObject) { return massObject.Mass / ...