A design pattern is a general reusable solution to a commonly occurring problem in software design.

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Design for object with optional and modifiable attributtes?

I've been using the Builder pattern to create objects with a large number of attributes, where most of them are optional. But up until now, I've defined them as final, as recommended by Joshua Block ...
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53 views

Common phrases to know which resources are no longer available [closed]

I'm working on an script for tracking urls on a web page. This script runs daily to identify resources that are no longer available. If a page returns a status code like 404 I know the resource is ...
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442 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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176 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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352 views

How to layer if statements when order of logic is irrelevant?

Basically I have a series of logic in my website that can lead to 5 total outcomes. Basically two different if tests and then a catch all else statement. For example: if cond1: if mod1: ...
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1answer
138 views

Best Practices For Temporary Scripts (Python)

I am running two separate programs which are similar enough that they share a lot of code. I run these programs often and after I evaluate the output. This is a very fluid process and everytime is ...
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60 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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1answer
91 views

JS design pattern/algorithm for avoiding duplicate redraws in a fairly coupled system

Given: some sort of widget based web app lots of JS functionality high coupling (communication/callbacks between widgets) widgets draw themselves certain widgets need to do a complete and fairly ...
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2answers
124 views

Limitations of the Identity Map pattern

After asking about the implementation in Ruby of the Identity Map pattern because the potential memory leak in long running server apps, I am considering my initial concept of that pattern. Initially ...
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1answer
177 views

Poltergeist and factories [closed]

I've just come across the Poltergeist anti-pattern - and maybe it's because the morning coffee hasn't kicked in yet, but I read the description: a poltergeist (or gypsy wagon) is a short-lived, ...
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117 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; ...
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197 views

How do you guard against hidden overflows

consider the following: (i+j)/2 i and j are both 32 bit integers and the result should also be. But in the little equation, there's a hidden overflow, i+j could become larger then a 32 bit integer ...
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102 views

Which pattern is suitable to send multiple type of responses through REST web service?

I have bunch of REST style web services which support XML and JSON type responses. Now I have to modify existing web services such that they provide Protobuf type of responses. Developer who has ...
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159 views

Design Pattern: A single class with multiple purposes, or multiple extended classes each with their own purpose in PHP

I'm working on a PHP framework called Carbon CMS. This framework will be used as base to build larger web applications on top of it. This framework should provide all kinds of interfaces such as ...
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1answer
176 views

I'm always reimplementing observer/subject code in Java. Is there a better option?

I'm always writing observer/subject interfaces in a particular Java project, e.g.: /** * Registers the receiver to the dispatcher. * When data arrives that the receiver can process, * it will be ...
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3answers
148 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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1answer
50 views

Pattern or idea to communicate with async hardware

This is more like a theory question than a practical one. And although I am using Arduino and Labview, it should work independently of the platform. I have an Arduino board controlling a set of pumps ...
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3answers
167 views

Structural pattern for an unconventional use of a database

I'm writing a game client as a personal project and using using it as a vehicle to learn about Java database access, specifically Neo4j, and possibly Spring Data Neo4j if I decide it's appropriate. ...
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2answers
171 views

Proper Query Object Pattern - NHibernate

I was looking to an alternative to Repository Pattern and I've read about "Query object pattern" (http://lostechies.com/jimmybogard/2012/10/08/favor-query-objects-over-repositories/). However the ...
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3answers
175 views

How to use Option Type Pattern in a language that doesn't support generics?

I've been interested to start using the Null Object / Option Type approach for replacing my old habits of null-checking multiple parts of my code. But, from the many examples I saw out there, it seems ...
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1answer
68 views

Factory Design pattern in languages with class types

I was reading in Peter Norvig's Design Patterns presentation. From slide 13: Dynamic version needs only the Window classes. The classes themselves serve as factories This works because ...
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3answers
154 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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2answers
105 views

Confused about javascript module pattern implementation

I have a class written on a project I'm working on that I've been told is using the module pattern, but it's doing things a little differently than the examples I've seen. It basically takes this ...
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405 views

Eliminate duplicate code in nested IFs without creating a function [duplicate]

Let's say we have two ifs that depend on each other: if var exists { if var is array { //Do stuff with var } else { //Resolve the problem } } else { //Resolve the ...
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2answers
864 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 ...
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1answer
152 views

Is this a specific pattern and what is its purpose? [closed]

I recently stumbled over the following C++ Code which confused me a bit: class One {/*definition*/}; template<class Base > class Two : public Base {/*definition*/}; template<class Base > ...
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115 views

Menu building pattern

I'm having troubles getting my head around the active-state handling of a menu when the menu isn't used for routing. I come from Drupal where the menu system handles the routing as well. so setting ...
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Extending database model of ORM in subproject

I have a maven project which contains some entities which are stored in a database. The purpose of this project is to manage personal information, users, locations, etc. This project can work on its ...
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1answer
113 views

Clarification about MVC Design pattern

I've been reading up on MVC and I had a doubt. The example where the Model, View and Controller are all individual classes whose objects are created and used to deploy the application in another ...
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84 views

What is a good way to structure my UI classes?

So, I have a program which has a swing GUI. (Java - duh!) I really, really don't think the way I'm structuring my classes now is good, so I am reorganizing from the ground up to follow best practices. ...
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48 views

How to validate information on server without using database or session

Each user has multiple sites they can access reporting data for in an application I am working on. To prevent having to go to the database on every single request, I validate that they have access to ...
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1answer
263 views

Best practices for implementing MVVM and MVC in delphi Pascal

I'm a Delphi pascal programmer, I use the latest Embarcadero delphi XE, and I would like to take advantage of design patterns such as Model view controller and model view view-model. However, there ...
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239 views

Implementation of strategy design pattern

Here is my code: public class StrategyDemo { public static void main(String[] args) { Phone ipPhone = new IPPhone("1234", "ProviderA"); Phone tdmPhone = new ...
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3answers
144 views

Avoiding polling with components

Once you create separate components that need to communicate with each other you enter the realm of systems programming where you have to assume that errors could originate at any step in the process. ...
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257 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, ...
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Passing configuration to a handler

I'm building my own JET Parser and one of the things I am trying to do as per the JET specifications is to allow changing of the start and end tags from the default <% and %>. Right now I have ...
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239 views

Effective Repository in C# - Where to put methods?

I'm trying to build a new application using the Repository pattern for the first time and I'm a little confused about using a Repository. Suppose I have the following classes: public class Ticket { ...
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101 views

Which patterns/architecture to apply for “Import Data, Process Data, Export Result”

I was wondering which architecture/patterns to choose for the following problem divided into three steps: Import TestScript Description from File (e.g. .xls, .txt) Process Described TestScript ...
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I recently read about unit of work and repository design patterns; working with EF wondering if this is a good design pattern

I found myself creating child records that require a master record to exist, first, so that they can reference it by the master record's primary key (if that's the right term). To accomplish this ...
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1answer
49 views

Modeling Associations

I am working on the design phase of a paper folding project. I have a few queries in this. Part of the problem statement says " A web can contain one or more ribbons in it. It can also contain a ...
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1answer
261 views

Good practice for returns in Python

I was recently working on some prototype code in Python. The code worked great, then I realized that I needed a little more feedback from one of my functions so I changed the return statement from ...
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87 views

Pattern that prevents events to trigger themselves

I am working at the client-side part of a web application, that is responsible for getting answers from users for specific questions and storing and restoring them from the database (or cookies) and I ...
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2answers
241 views

Is this a candidate for Singleton?

I have an external thermometer connected via USB that is controlled by my SW. Different parts of my system will use it but never at the same time (all in one thread). However, it is a single device ...
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1answer
192 views

When to use the whiteboard pattern versus direct calling

I'm creating the architecture for a new embedded project. The system has some inputs that go to wildly different outputs. The whiteboard pattern is very useful for this (see Listeners Considered ...
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1answer
65 views

Queue of jobs in a different states and with different services around

I need to design a 'queue' of jobs (in a a very much UI oriented application) that can be run by a user and I need some other thoughts to pick optimal approach from ground up. My jobs can be in a ...
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2answers
109 views

API - How to handle scope based functionality?

TLDR; Where and possibly how should I implement scope based logic in the example code? I have got a ASP.NET Web Api. The Api uses OData (on top off REST) for data endpoints and OAuth 2.0 ...
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120 views

When to use packages or Repositories in Laravel?

I'm a Laravel (PHP) developer, and new with DI, Packages (workbench) and Repositories (Pattern). I want to know about the best concept/methodology for a more flexible design; ie. the project can grow ...
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63 views

Pattern for data types that are related yet fundamentally different in utility

Background I'm currently working on a codebase for what is to become a forthcoming website's content "engine", where it will take in different types of standardized data (implemented with XML), parse ...
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62 views

Encapsulate multiple properties into a single class to use as a custom DependencyProperty

My application is a WPF project implemented in C# .NET (4.5) using an MVVM architecture with no code-behind in the View. In order to eliminate the coupling between the View and the ViewModel I'm ...
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129 views

What is design pattern/paradigm for ASP.NET web-apps? [closed]

I don't actually know if my question is correct, but working on a webapp porting from ASP.NET world to Java + Spring platform I came up with this question in mind. Using Spring MVC, the new version ...