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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3
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2answers
406 views

How to use SOLID principles in this example

I have reading about SOLID principles last week and decided to try to solve real world problem by using them. So I got the problem of real world ecommerce site managing totals. Problem Statement: ...
2
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2answers
64 views

How to handle multiple models that relate to a single model

First of, sorry for the vague title. In our website framework, we have modal classes to represent our database tables, that hold a rows data. I'm currently working on a stat style page, and I'm ...
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2answers
139 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 ...
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2answers
269 views

Cleanly using PHP Iterator class in Loops - calling first element

I have implemented the Iterator class in PHP and built the follow mandatory methods as follows class I implements Iterator { private $a = []; function __construct(array $a) { ...
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2answers
472 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 ...
-1
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2answers
514 views

Object inheritance and method parameters/return types - Please check my logic

I'm preparing for a test and doing practice questions, this one in particular I am unsure I did correctly: We are given a very simple UML diagram to demonstrate inheritance: I hope this is clear, it ...
5
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1answer
99 views

When applying the interface segregation, should you separate interfaces for regular setters and mathematical operations?

When applying the interface segregation, should you have separate interfaces for a straightforward setters and interfaces that perform an operation before setting? For example, say you have a class: ...
4
votes
1answer
52 views

Best practice for defining and keeping related stateless methods together in Objective-C

I have a few methods which are stateless: loginWithEmail: password: completion: signUpWithEmail: password: completion: resetPasswordForUsername: completion: Currently what I do is I create a class ...
4
votes
1answer
250 views

Advantages and drawbacks of different ways using Either-types

I am writing software for compiling programs. Therefore have a Compiler that compiles a given sourcecode. It then returns a CompileResult that is similiar to an Either type (it is actually internally ...
2
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1answer
53 views

SRP and Getters/Encapsulation

I recently watched this presentation of Robert C. Martin about the Single Responsibility Principle: https://www.youtube.com/watch?v=Gt0M_OHKhQE He presents an Employee class with multiple ...
2
votes
1answer
363 views

Change routing to comply with Law of Demeter

I have a Task, Owner and Plan. Charge values are kept in a plan, owner is on a particular plan and task knows its owner. A task needs to setup its charges based on the knowledge the owner has. Owner ...
2
votes
1answer
387 views

DataMapper for a MMO game plugin to send packets

I am working on an plugin for some game-server. The information about the plugin is not really necessary. Few points you might find helpful to answer to this question: The server The server is ...
1
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1answer
134 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 ...
5
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0answers
215 views

ActiveX, OLE, COM explanation or informative links

I've been programming a lot with C# on Visual Studio and many minor/other languages, but I'm having a really hard time to get the grasp of ActiveX, OLE, COM interfaces. All I got is that they're like ...
4
votes
0answers
77 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 ...
2
votes
0answers
62 views

What design pattern is used in this delegating scenario?

I am currently having to bend some framework API to fit my usecase. The framework provides generic interfaces such as public interface Processor<T> { T process(T t); } with various ...
2
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0answers
72 views

Injecting data processing logic into class

I want find more elegant and appreciate way to inject processors into CommandProcessorDispatcher class. Or it can be another one solution (the goal is separate each command processing logic to ...
2
votes
0answers
225 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 ...
2
votes
0answers
171 views

The inheritance argument of zope.interface (providedby vs isinstance)

What limitations does inheritance of an interface through an abstract base class present that are addressed by zope.interface? In the following talk given in 2010 by Jeff Rush about interfaces, at ...
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0answers
120 views

How and where to make global function file in jsp sevlet web application

I am making a website in Servlet&JSP. I am looking for good way to make a specific function file from where I can call and declare my common functions. If I made a java file function. Java, so is ...
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0answers
156 views

How to separate out below tightly coupled classes

I have two classes which are somewhat tightly coupled to one another. Lets call them A and B. A derives from C and B derives from D. B is the class whose instance is created by the system and then B ...
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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>. ...
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0answers
123 views

The finer points of HMVC

I'm new to HMVC and whilst tutorials are great about dealing with the overall details of keeping modules separate and only letting controllers communicate, they aren't so great at explaining the ...
1
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0answers
64 views

Modelling network and persistent entity representations

I have an app where I need to synchronize some entities (simply download latest versions of entities from server to client). Entity has bunch of text properties and bunch of resource links (referenced ...
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0answers
38 views

Class/Object with different sets of configurations, singletons etc (PHP)

I want to produce maintainable code for configuring one or multiple classes differently depending whether in a production or development environment. For example, making a Paypal class/object that ...
0
votes
0answers
36 views

Is there a good pattern for building nested form objects with validations?

I'm using the form object pattern to handle data normalization and validation in my app. It's working well for simple cases, but some of my form objects are composites (or roll-ups) of multiple other ...
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0answers
78 views

C++ object design

I am programming a database similar to Cassandra. I use C++. Simplified database store its data in one or two "memory table" and several "disk tables", all stored in single directory. I have class ...
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0answers
41 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? ...
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0answers
30 views

Graph curve and actual curve plotted on screen implementation patterns

I'm implementing a graph plotter. There are Curve objects, that contains points of actual XY data. When I plot to screen, I need to calculate the XY points on screen, resulting a PlottedCurve. This ...
0
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0answers
60 views

Should URL params and request params be stored in the Request object

Is it acceptable if GET parameters don't reside in the Request object, but in the URL? I am writing a small library in PHP, which is to represent the Request/Response as different entities and ...
0
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0answers
473 views

Evaluating local storage for data persistence for small, stand-alone applications

TL;DR - I have a standalone application that will remain relatively small. I'm trying to evaluate between using XML files or a lightweight database for local storage of data that needs to be ...
0
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0answers
66 views

Why use subtyped functions?

Say you have arguments A1 >: A2 (contra-variant), and return types B1 <: B2 (covariant). The corresponding functions are such that: A1 => B1 <: A2 => B2 Sometimes, this makes sense to me - ...
0
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0answers
75 views

using internal or external iterators over graph edges

I've written some code to manipulate sparse graphs for school work I'm doing, and I have an operation which requires me to loop over all the edges of a graph. The interface I need to implement is some ...