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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37 views

Implementing a Dynamic Network Message Dispatcher/Handler

I have a current requirement of an application to handle messages of different types, subtypes, and possibly more subtypes, as deep as needed. These messages come off the network and should be shared ...
6
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3answers
208 views

Should instance of Employee contain a reference to instance of Office, or should Office contain an array of Employee?

Title is an abstraction of what I am actually doing, but in essence the same. The main entity I will be dealing with are the Employees themselves; "Send package to employee John Doe". In order to ...
1
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3answers
142 views

What is a good Design Pattern for a bundle of methods that comprises an algorithm?

This is a Design question relating to finding out a good OO design pattern or design structure or class combination that can house an algorithm that processes user selection to produce product ...
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2answers
455 views

Emulation of MMU accessing the contents of the registers

I'm having a play around with emulating a simple old CPU. I've set the structure up, so far anyway, as follows: The device is the main and creates an instance of the CPU. The CPU then creates ...
2
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1answer
254 views

What design patterns could be used here?

I'm trying to come up with a nice design (preferably pythonic) for the following use case. Say there's three services - A, B, C in multiple locations L1, L2, L3, etc. Each service provides ...
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2answers
71 views

Name for methods changing a object vs. creating a new one [closed]

I encountered a naming problem while writing a vector class. Basically I have two different versions of each method, one which returns a new object and one that changes the object, the method is ...
1
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2answers
111 views

User and role modeling

I'm working with a system in ASP.NET MVC, with Entity Framework for ORM. The application has a requirements to allow users to have different types of roles, and authorization rules will be different ...
-1
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3answers
258 views

Why List<E> interface is additionally introduced in collection hierarchy? [duplicate]

Below is the diagram, where, if we just consider the implementations of List, AbstractList maintains the core behavior of list. To introduce the new implementation class MyList(say) one can ...
-3
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2answers
137 views

Advantages of these recommendations in ooprogramming using Java

Below are the recommendation from section 5.1 of this essay. While Java is not a pure object-oriented language, it is possible to program in a pure object-oriented style by obeying the following ...
8
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3answers
508 views

Cleanest way to write logically procedural software in an OO language

I'm an electrical engineer and I don't know what the hell I'm doing. Please save the future maintainers of my code. Recently I've been working on a number of smaller programs (in C#) whose ...
9
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4answers
5k views

Is the Entity Component System architecture object oriented by definition?

Is the Entity Component System architecture object oriented, by definition? It seems more procedural or functional to me. My opinion is that it doesn't prevent you from implementing it in an OO ...
1
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3answers
82 views

Where should PDOExceptions be dealt with?

I wrote a database wrapper class to help with queries and I'm trying to figure the best way to implement try-catch blocks. In my database class, I have a helper function; public function ...
4
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2answers
166 views

Should serialization and deserialization be the responsibility of the class being serialized?

I'm currently in the (re)design phase of several model classes of a C# .NET application. (Model as in M of MVC). The model classes already have plenty of well-designed data, behaviors, and ...
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2answers
213 views

Big graph traversal with OOP

I'm trying to solve a algorithmic contest's problem. I have a matrix 2000x2000. I want to represent it as graph and traverse it with BFS/DFS. I have time limits on app running (2s). Simple vertices ...
0
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1answer
168 views

How much to encapsulate when objects being dealt with are pretty similar

As I have been answering questions related to object-oriented design and how to go about reducing the amount of classes to make sure that there is not a lot of "class clutter" and code repetition I ...
1
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1answer
116 views

How to avoid tying these two methods together with global mutable state?

I'm in the process of reading Code Complete 2 and learned that using global state is a no-no. What can I do to avoid using global state in this situation? Some background information: I have two ...
3
votes
1answer
48 views

Can I resolve an issue with SRP, SOC that prevents object initialization via constructor?

In OOP, I can populate (initialize) an object using constructor injection at object creation time, or setter injection, after creation time. I like the idea of populating object at creation time via ...
2
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1answer
76 views

Conceptual question whether to pass data between functions or use a Class

I have a hard time to find an ideal concept / design and would appreciate your thoughts on this. I have 16 "tissues" that I need to keep track on. Each tissue holds a pressure that need to be ...
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2answers
356 views

How does a search functionality fit in DDD with CQRS?

In Vaughn Vernon's book Implementing domain driven design and the accompanying sample application I found that he implemented a CQRS approach to the iddd_collaboration bounded context. He presents ...
2
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1answer
56 views

Why is SRP using the class construct to contain a responsibility opposed to using any other OOP entity?

SRP states ... There should never be more than one reason for a class to change. But why a class? Why not use granularity of a function/method? What instead of separating my functionality into ...
7
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5answers
1k views

Is method overriding always a violation of Liskov Substitution Principle? [duplicate]

Overriding a method originally defined in the super class, by definition means this method will do different things when invoked on an object of the base class or an object of the subclass. So does ...
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votes
3answers
118 views

What design pattern is this? [duplicate]

I'm struggling to come up with the name of a design pattern that I need to write about. I've been lead to think it was abstraction but apparently not. Let's say I had a driver class which has a Drive ...
1
vote
3answers
445 views

Bad Practice using Auto Generated Classes for Data Access

I've seen this before but haven't found concrete reasons. When you add Entities to your EF model, EF auto generates classes for these entities. In terms of DataAccess, why is it preferred to not ...
24
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6answers
3k views

Can you implement “object-oriented” programming without the class keyword?

Say we want to provide an abstraction of an "account" in a bank. Here's one approach, using a function object in Python: def account(): """Return a dispatch dictionary representing a bank ...
1
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1answer
123 views

Design Pattern - Adding features to a class

I'm finding myself unable to solve a design problem. For the sake of my simplicity, I'm going to use C# (Web API). Let's say I have an abstract class RestController: public abstract class ...
3
votes
1answer
154 views

Is Apple sample code the “correct” way to go?

I'm in a place were I know how to build apps and have submitted at least 5 for different clients to the app store and wanted to step up my game. So of course I went to Apple resources and analyse the ...
18
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5answers
2k views

Create new object or reset every property?

public class MyClass { public object Prop1 { get; set; } public object Prop2 { get; set; } public object Prop3 { get; set; } } Suppose I have an object myObject of ...
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0answers
33 views

DDD Request Validation Handling

I stuck somewhere that I can't find a solution! There are plenty of validation questions here, but as far as I see, most of them were asking about entity validation. But what about request validation? ...
3
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3answers
507 views

How should my web application handle common errors such as incorrect password, session timeout, etc.?

How should my web application handle common errors such as incorrect password, session timeout, etc.? I have a class called Hotmail that contains various method such as login, logout etc. To ...
4
votes
1answer
123 views

Where to initialize objects

I have an BallEntity class that is part of a game that uses a Entity Component System architecture. This class have 'components' that are like the attributes of that class. I create and initialize ...
0
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2answers
130 views

Best practice relationship variable naming: Should I use the description of the relationship or variable. Example personId or owner?

When I'm creating domain models and adding variables to a class. I'm havng to trouble which naming I should use. For example If I have a Person and a Car. When I have: Class Person { var int ...
3
votes
1answer
153 views

Providing views to an std::container

I want to maintain a buffer of 5 seconds of sensor data. The sensor data consists, among other things, of accelerometer readings in x,y,z dimensions, gyroscope readings in x,y,z dimension and ...
30
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9answers
10k views

Should the methods of a class call its own getters and setters?

Where I work I see lots of classes that do things like this: public class ClassThatCallsItsOwnGettersAndSetters { private String field; public String getField() { return field; ...
5
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1answer
125 views

PHP: Injecting the same database connection into multiple objects

Suppose that there are two classes that define objects of vastly different function such that in the datastore, the information they require is divided into two separate databases. For example, the ...
4
votes
1answer
262 views

Do serialization functions belong in a model or a controller?

I'm developing an application where: Models keep data as a multi-dimensional array, which are saved as-is to a MongoDB database. The model is used to provide methods to manipulate the data, and ...
0
votes
4answers
270 views

How can I avoid the use of strings?

I'm implementing a program where the user can 'create a musical scale' from a variety of notes (identified by their names), and the program will generate music from this scale. I want to implement a ...
2
votes
1answer
115 views

Beginners C# question about Array.Reverse

I am sitting through a very well-explained and thorough video tutorial series, using Visual Studio 2012 as my developing environment. Anyway, one thing that is hard to figure out is this. Say you ...
17
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3answers
1k views

“Too object-oriented”

I come from a strong OO background, and I have recently started working in an organization which, although the code is written in Java, has a lot less emphasis on good OO design than what I am used ...
3
votes
4answers
10k views

What exactly are SDLC and OOP?

I have been asked "What are SDLC and OOP?" many times in job interviews but I am still not sure how to answer this question. I am a web developer for quite some time but I still have problem with ...
10
votes
5answers
452 views

Should I prefer composition or inheritance in this scenario?

Consider an interface: interface IWaveGenerator { SoundWave GenerateWave(double frequency, double lengthInSeconds); } This interface is implemented by a number of classes which generate waves ...
1
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2answers
42 views

Instantiating a set of Objects from information in File

Let’s say I have four classes A,B,C,D. Each of those classes contains a Tree object. This tree object needs to be built according to information stored in files f_A, f_B, f_C, f_D, for classes ...
1
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1answer
85 views

OO Design: Algorithm changing State (Information Flow Question)

I have a class Context, which contains an instance of an abstract class State, which has multiple concrete subclasses (this is an implementation of the State Pattern). Each State subclass executes a ...
3
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0answers
64 views

is this use case well structure?

I'm trying to create a use case that make sense, and i am a little bit confused with the alternate path i think i am doing it in the wrong way, the system should tell the admin when a shared playlist ...
40
votes
10answers
15k views

Can't I just use all static methods?

What's the difference between the two UpdateSubject methods below? I felt using static methods is better if you just want to operate on the entities. In which situations should I go with non-static ...
14
votes
5answers
925 views

Is the semantic contract of an interface (OOP) more informative than a function signature (FP)?

It is said by some that if you take SOLID principles to their extremes, you end up at functional programming. I agree with this article but I think that some semantics are lost in the transition from ...
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votes
1answer
95 views

What might be a good way to get hands on experience with Object Oriented PHP [closed]

I am a Computer Science student. I took a course on OOP, and I understand the concepts (classes, extending, encapsulation, etc). I'm also a web developer, have been doing it for about three years; ...
2
votes
0answers
55 views

What's the best pattern to validate a conditional entity? [duplicate]

I'm developing an ASP.NET MVC 5 website and I have a view with a grid. In this grid I have a column which represents an URL property. This url is a link to download some files, but this url should be ...
1
vote
1answer
92 views

If the representation part of type abstraction is declared private, then how does sub-classing violate encapsulation?

Here, I learned that sub-classing violates encapsulation: it violates encapsulation, since the implementations of the superclass and subclass become tightly coupled For instance, If we consider ...
4
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3answers
454 views

When is an object of real world a (computational) object in OOP world?

In an OOP design phase strategy, Any physical/conceptual object of a system can be modeled(considered) as computational object in your OOP designed program based on below two conditions: First ...
13
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4answers
41k views

What is the use of Association, Aggregation and Composition (Encapsulation) in Classes

I have gone through lots of theories about what is encapsulation and the three techniques of implementing it, which are Association, Aggregation and Composition. What i found is, Encapsulation ...