0
votes
1answer
34 views

How to save entities relations using unit of work pattern

I use Unit of work pattern to commit all new, dirty, deleted entities to the DB (using a db_mapper). Example of entities are: Student and Class So Student->registerDirty() will add this entity to ...
0
votes
2answers
73 views

When should you create/destroy underlying object in a class that wraps it

(note: I used Java to make it easer to explain my question, but the actual language is irrelevant for this dilemma) TL; DR: I have a wrapper around some underlying class. At which point should I ...
0
votes
1answer
72 views

Strategy vs Publiser-subscriber pattern

Let's say I have a channel endpoint where I receive messages. Because I want to process messages in a different way depending on its Header property, rather than create a massive switch I create ...
-2
votes
1answer
59 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 ...
1
vote
0answers
116 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 ...
0
votes
0answers
30 views

update methods in simple factories

I have simple factory class with differently named methods which create the same object but differently. These created objects are persisted to db. These are then retrieved from the db elsewhere and ...
35
votes
11answers
4k views

Are error variables an anti-pattern or good design?

In order to handle several possible errors that shouldn't halt execution, I have an error variable that clients can check and use to throw exceptions. Is this an Anti-Pattern? Is there a better way to ...
0
votes
0answers
60 views

How to cleanly write a multi step process with user feedback and multiple callback

When you have some process that has several steps and you multiple entry points the code gets ugly pretty fast. I encountered this with Facebook integration in my mobile app: User wants to share ...
0
votes
3answers
217 views

“Property Container” design-pattern in-depth definition

Could anybody, please, explain what is a Property Container or at least where can I get information about that pattern on the Internet? I've found that it exists as one of the Fundamental patterns in ...
0
votes
0answers
30 views

DSL enabling users to reference forms and records to display?

There are three main "unique" components to my system: Visual form builder (AngularJS backed); generates an id CRUD automatically available for it at /form_type/id "Aggregate page"; with a form ...
0
votes
2answers
112 views

How does one design his various architecture/business models?

I'm currently learning about various application design approaches and there's one thing I can't really get my head around. Let's say I have a physical device in my network, an IP surveillance ...
5
votes
3answers
7k views

Should angularjs directive directly interact with services or is it considered an anti-pattern?

Which one is considered better: having a directive that interacts with services directly or having a directive that exposes certain hooks to which controller may bind behaviour (involving ...
3
votes
2answers
177 views

How to abstract transition between Views?

Our team is developing an application using WPF with MVVM. We want to make ViewModels reusable. With this intention we want to abstract the transition logic between Views (ViewModels, we use ...
0
votes
1answer
129 views

Datastructure for a factory pattern in practice

I'm implementing what's basically an event log system for a larger system. I used Single-table inheritance to build out the table. The problem I'm having is figuring out how to build out the classes ...
3
votes
1answer
171 views

Naming a sending/receiving module. Does the pattern have a name? [closed]

I'm working on a simple piece of functionality (actually a ruby gem, but that is beside the point) which can be used to receive and persist incoming messages send and persist outgoing messages ...
3
votes
1answer
298 views

What is the pattern called when getters take responsibility for the setting?

I've been heavily using a pattern for years now, but I don't know what it's called. It looks like this.... class xzy { public function getFoo() { if ( undefined(this.foo) ) { ...
0
votes
0answers
157 views

Pattern or solution for using classes with different interface the same way

What I would like to achieve is to use classes (now two, later more) with different interface the same way, so I would like avoid using decisions based on the interface on upper levels for instance, I ...
3
votes
3answers
823 views

What is the middleware pattern?

Here's a Ruby poject that implements the middleware pattern. From the description, I have no idea what the pattern is, what it's useful for, and why other solutions wouldn't work as well. What is ...
0
votes
1answer
125 views

Architecture for writing add-ins for closed-source software

currently I'm designing an add-in for the modelling tool Enterprise Architect. The general architecture is shown in the picture below. Basically every action where the add-in can react to is ...
0
votes
1answer
67 views

How to record/store edits?

In many programs and web apps (stack exchange included) the program is able to backtrack what edits where made to the piece. My issue is similar: I want to be able to store a "timeline" of edits, ...
5
votes
2answers
1k views

When is Efferent / Afferent coupling good or bad

I have a software patterns exam this week and one of the topics we are to study is Efferent and Afferent coupling. I understand a package has a high Ce (efferent coupling) if it depends on a number ...
51
votes
2answers
5k views

Are there any OO-principles that are practically applicable for Javascript?

Javascript is a prototype-based object oriented language but can become class-based in a variety of ways, either by: Writing the functions to be used as classes by yourself Use a nifty class system ...
-2
votes
2answers
129 views

Software patterns for frameworks [closed]

I am currently doing some research about software patterns and about architectural patterns for frameworks specifically. Google is not really showing off for this topic, so I am curious which ...
5
votes
2answers
684 views

Returning an IQueryable from an IRepository

Using the Repository pattern, is it proper to return an IQueryable of a data set (table), for generic usage? It is very handy in many cases, especially when using external libraries that leverage ...
1
vote
2answers
273 views

Pattern(s) about hierarchical settings overwriting

Assume that you have a hierarchy of organizational units: - Company -- Branches --- Departments ---- Teams Lets say I have some settings (for simplicity assume that they have the same properties) ...
8
votes
2answers
259 views

Low coupling processing big quantities of data

Usually I achieve low coupling by creating classes that exchange lists, sets, and maps between them. Now I am developing a Java batch application and I can't put all the data inside a data structure ...
6
votes
4answers
632 views

Should injecting dependencies be done in the ctor or per method?

Consider: public class CtorInjectionExample { public CtorInjectionExample(ISomeRepository SomeRepositoryIn, IOtherRepository OtherRepositoryIn) { this._someRepository = ...
1
vote
1answer
293 views

What is the “Find-Fix-Verify” pattern?

What is the "Find-Fix-Verify" pattern, as related to the process of doing editing/spellchecking/debugging, etc.? Where is this pattern best described? What are some advantages and disadvantages of ...
10
votes
3answers
1k views

What is the pattern name for using method chaining to build an object?

I frequently use a pattern where I using method chaining to setup an object, similar to a Builder or Prototype pattern, but not creating new objects with each method call, instead modifying the ...
10
votes
9answers
1k views

Is this an anti-pattern?

I've seen this a lot in our legacy system at work - functions that go something like this: bool todo = false; if(cond1) { ... // lots of code here if(cond2) todo = true; ... // some other ...
5
votes
1answer
124 views

Checking members and instantiating in properties

Consider this: public MyClass { private Resource _myResource; public Resource MyResource { get { if(_myResource == null) { ...
3
votes
3answers
817 views

New Silverlight app. MVVM. RIA Services vs CSLA

Another 2 days of reading and watching demos and here we go. For my enterprise LoB Silverlight app I'm going to use: Prism for UI aspects and modularity. MVVM pattern (using Prism) ??? to bring ...
4
votes
3answers
539 views

Architectural Patterns for a Game

So I've got a solution that contains a few big projects, which I'm trying to break down into smaller projects with more isolated responsibilities. This is a game I'm tinkering with -- I'm mainly a LOB ...
20
votes
12answers
3k views

What design patterns are the worst or most narrowly defined? [closed]

For every programming project, Managers with past programming experience try to shine when they recommend some design patterns for your project. I like design patterns when they make sense or if you ...
2
votes
6answers
855 views

Is “call and return” a pattern or an antipattern?

Imagine to have this code: class Foo: def __init__(self, active): self.active = active def doAction(self): if not self.active: return # do something f=Foo(false) f.doAction() ...