A methodology that enables a system to be modeled as a set of objects that can be controlled and manipulated in a modular manner

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153 views

Single responsibility: how does this code cause problems?

Given the following interface interface Modem { public void Dial(string pno); public void Hangup(); public void Send(char c); public char Recv(); } Uncle Bob writes However, ...
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2answers
111 views

How to let the outside world decorate my private field?

Imagine a simple Controller (as in process control) interface. I have some concrete classes, say PIDController, that implement it. I also have some decorator classes that extend these classes ...
3
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1answer
120 views

Redundancy caused by polymorphism

I have two chat rooms, one has administration behaviour, and one doesn't. I have factored out all of the common code into a base chat room, but the AdministerChatroom behaviour I have pulled out into ...
0
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1answer
58 views

Efficiency of getters/setters with database performance

I'm currently in the process of refactoring a very old personal project of mine, which used procedural PHP-in-HTML code. I'm modernising it as a learning project, using OOP where beneficial. I ...
2
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1answer
57 views

class hierarchy with structurally different subclasses

I want to implement a protocol layer which sits on top of the TCP/IP stack. There is a limited set of PDUs that can be sent and for each PDU there is a class which represents it in a structured form. ...
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5answers
484 views

Are a class's methods stored only once in memory? [on hold]

When I create an instance of a class the system allocates memory for all instance variables of the class. Some languages may call them fields or properties. But what about the code of the class ...
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1answer
110 views

Entity Component System Coupling

Lately I've been working on a small personal project which is basically an Entity Component System framework with autoupdated Systems. While I have a pretty good idea on the way the framework should ...
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2answers
134 views

Designing Nested List<Class> Property in a Class

I'm currently in the class modeling phase of my project. Real life Scenario: Let's say I have a Project that is composed of Main Components and each Main Component is composed of Sub Components and ...
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2answers
161 views

C# - initialize variable inside method and use in whole class [closed]

this is a conceptual question, but if i initialize a variable in c# as public will it be able to be used in the class as I want a variable "player1" and a variable "player2" where either could be one ...
0
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1answer
40 views

The ViewController design in iOS vs MVC in tradiational web apps design

As I came from the background of webapps and move to iOS programming, I am wondering why we can't just apply the MVC design approach to native apps, i.e. in iOS, the view and controller are tightly ...
2
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1answer
140 views

Composing programs from small simple pieces: OOP vs Functional Programming [closed]

I started programming when imperative programming languages such as C were virtually the only game in town for paid gigs. I'm not a computer scientist by training so I was only exposed to Assembler ...
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3answers
140 views

Am I violating LSP if the condition can be checked?

This base class for some shapes I have in my game looks like this. Some of the shapes can be resized, some of them can not. private Shape shape; public virtual void SetSizeOfShape(int ...
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2answers
259 views

Advice on approaching a significant rearrangement/refactoring?

I'm working on an application (hobby project, solo programmer, small-medium size), and I have recently redesigned a significant part of it. The program already works in it's current state, but I ...
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5answers
360 views

Questioning one of the arguments for dependency injection: Why is creating an object graph hard?

Dependency injection frameworks like Google Guice give the following motivation for their usage (source): To construct an object, you first build its dependencies. But to build each dependency, ...
2
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1answer
155 views

Is this JS code a good way for defining class with private methods?

I was recently browsing a open source JavaScript project. The project is a straight port from another project in C language. It mostly use static methods, packed together in classes. Most classes are ...
1
vote
1answer
131 views

Dependency injection in constructor, method or just use a static class instead? [closed]

What is the best between: $dispatcher = new Dispatcher($request); $dispatcher->dispatch(); and $dispatcher = new Dispatcher(); $dispatcher->dispatch($request); or even ...
35
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5answers
4k views

Passing functions into other functions as parameters, bad practice?

We've been in the process of changing how our AS3 application talks to our back end and we're in the process of implementing a REST system to replace our old one. Sadly the developer who started the ...
3
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1answer
141 views

Project structure: where to put business logic

First of all, I'm not asking where does business logic belong. This has been asked before and most answers I've read agree in that it belongs in the model: Where to put business logic in MVC design? ...
2
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1answer
89 views

Models, collections…and then what? Processes?

I'm a LAMP-stack dev who's been more on the JavaScript side the last few years and really enjoying the Model + Collection approach to data entities that BackboneJS, etc. uses. It's helped me organize ...
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4answers
121 views

When should a method of a class return the same instance after modifying itself?

I have a class that has three methods A(), B() and C(). Those methods modify the own instance. While the methods have to return an instance when the instance is a separate copy (just as Clone()), I ...
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6answers
485 views

Requesting feedback on my OO design

I'm working on an application that creates music by itself. I'm seeking feedback for my OO design so far. This question will focus on one part of the program. The application produces Tune objects, ...
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3answers
132 views

How to change the state of a singleton in runtime

Consider I am going to write a simple file based logger AppLogger to be used in my apps, ideally it should be a singleton so I can call it via public class AppLogger { public static String file = ...
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0answers
68 views

JS closures - Passing a function to a child, how should the shared object be accessed

I have a design and am wondering what the appropriate way to access variables is. I'll demonstrate with this example since I can't seem to describe it better than the title. Term is an object ...
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4answers
227 views

Is there a way to avoid type-checking in this scenario?

I have a class SuperClass with two subclasses SubClassA and SubClassB. I have a method in a different class which takes a SuperClass parameter. The method should do different things depending on the ...
0
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1answer
147 views

Should I limit my type name suffix vocabulary when using OOP?

My co-workers tend to think that it is better to limit non-domain type suffixes to a small fixed set of OOP-pattern inspired words, e.g.: *Service *Repository *Factory *Manager *Provider I believe ...
0
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1answer
94 views

One boilerplate class or many similar classes?

Lets say I'm trying to model a variety of objects that are virtually identical, the only difference being their class variables. Am I better off creating one boilerplate class and just calling the ...
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4answers
422 views

Are first-class functions a substitute for the Strategy pattern?

The Strategy design pattern is often regarded as a substitute for first-class functions in languages that lack them. So for example say you wanted to pass functionality into an object. In Java you'd ...
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1answer
82 views

What's a “Polymorphic method”?

Sometimes people use the phrase "Polymorphic method/function". Does it mean: A method that takes a Polymorphic type as a parameter, and performs some operation on it. By "Polymorphic type" I mean a ...
0
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1answer
81 views

Passing in config values to a method using SOLID principles

I have an email helper class that has a method that sends email: private static class EmailHelper { public static void SendEmail(string from, string to, string subject, string message) { ...
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3answers
166 views

Drawback of using static method [duplicate]

For methods that never access instance variable or static variable and they act just like a function (name-spaced) and they are deterministic base on only the input arguments , I want to ask, are ...
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0answers
58 views

Dealing with class optional dependencies

I am wondering how are you guys handling an optional class properties. Let's say I have a product that can bud doesn't have to have a color property. Is that really the best way of doing that? Should ...
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3answers
374 views

Self-Evaluation: How do I know if I actually have a “good grasp” of OOP? [duplicate]

If I skip the back story and any thoughts I have on this topic, there's really only one question left to ask: How can I find out if I have a "good grasp" on OOP? (I am specifically using PHP, but ...
5
votes
2answers
919 views

Why are inheritance, encapsulation and polymorphism not the pillars of OOP? [closed]

One day I went to a Stack Overflow chat and saw a phrase, that was stating that inheritance, incapsulation and polymorphism are the pillars of OOP (in the sense that they are fundamental, a ...
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3answers
142 views

Protected variable & protected method in the era of TDD [closed]

I understand protected method is good for unit testing since you can easily mock by the class by overriding the protected method for the sake of testing. However, protected variable is just a global ...
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8answers
5k views

Is splitting up a function into several inner functions an anti-pattern? [duplicate]

Imagine a long and complicated process, which is started by calling function foo(). There are several consecutive steps in this process, each of them depending on result of the previous step. The ...
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3answers
140 views

Extending a struct. Using helper classes rather than composition

I have a struct which I want to add static methods to. Yes, you guessed right I'm talking about Datetime. It's a pretty typical requirement to add MyCustomParse. It happens to return Datetime?, so ...
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0answers
17 views

How to set ICON image for java.jar executable jar file [migrated]

I have developed a game in Java made an executable jar file mygame.jar. I now want to set an ICON image to mygame.jar so that it shows my custom image instead of usual java tea cup image. Please ...
2
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0answers
85 views

Parent class loses coupling after I refactored identical code blocks from child classes to parent

I have a class called Parent, and classes called Child1, Child2, etc, I have noticed that child classes have a series of function calls that had same (duplicated) lines of code that could be ...
0
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3answers
248 views

How do you make a service stateless?

When doing Domain Driven Design it is advised that services should be stateless. There are several kinds of services when doing DDD: Application services. Domain services. Infrastructure services. ...
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2answers
855 views

How to replace inheritance with composition in this case?

I've recently read several articles about the advantages of the composition over inheritance. Their authors said that you can always replace inheritance with composition (to be precise, they say they ...
5
votes
1answer
329 views

Decoupling when constructors have non-contractual parameters

By non-contractual parameters, I mean parameters that are not interfaces or service dependencies, something like class Person(string name). I am writing a webpage scraping application, and so far ...
2
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3answers
150 views

Should an Animal be abstract or allow for instantiation to represent a “general” instance? [closed]

After a short discussion in the comments here I have come to wonder whether or not a baseclass like Animal in the traditional OOP example should be marked as abstract or not. Personally I believe it ...
17
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11answers
2k views

When would you want two references to the same object?

In Java specifically, but likely in other languages as well: when would it be useful to have two references to the same object? Example: Dog a = new Dog(); Dob b = a; Is there a situation where ...
0
votes
3answers
255 views

Does the pattern of passing in one object instead of many parameters to a constructor have a name?

If you have a constructor that takes a lot of parameters, like this: public OrgUnitsHalRepresentation(List<OrgUnitSummaryHalRepresentation> orgUnitSummaryHalRepresentationList, int count, ...
0
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3answers
69 views

Structuring an application that reads from a .properties file

I have a Java app with three classes: Foo, Bar and Baz. All three depend on a bunch of what are currently constants defined in each class in order to determine how to run. On top of that, Baz ...
2
votes
4answers
624 views

Why would the switch from C# to scala make sense in order to take advantage of scala's functional capabilities? [closed]

What is the benefit of using functional program for large scale software projects? I have heard it is pretty performance equivalent to regular OOP. I also have heard that it is more "mathematically ...
0
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1answer
133 views

Does lots of Instance Variables within my class suggest flawed Design?

Ok so I am setting out to consolidate some learning I have been doing. What I am going to do is create a small game relating to a game I enjoy called Persona. For reference a persona you can think of ...
7
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4answers
439 views

“Immutable” interfaces

I am confused about the notion of immutability. Consider the following structure of a simplistic calculator: Here are the interfaces: interface IOperationalInterface { int Sum(int a, int b); } ...
0
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1answer
72 views

Inheriting from Abstract class vs Enum Types for custom exceptions

I am creating an interface and would like the implementer(s) of this interface to throw exceptions in the case that something goes wrong. Let's call the implementer a plugin. I have a director which ...
9
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4answers
2k views

What is meant by “OOP hides the state”? [closed]

In one of many anti-OOP rants on cat-v.org I found a passage by Joe Armstrong raising several objections against the OOP model, one of which was the following: Objection 4 – Objects have private ...