13
votes
What's the purpose of multiplying by 1024x1024?
It's difficult to be (at all) certain without looking at the code, but it kind of sounds like it's implementing fixed-point arithmetic, with 12 bits before the decimal point, and 20 bits after.
When/...
- 44.8k
7
votes
Accepted
How do you correctly turn this text into an activity diagram (problem with timer)?
Problem
Your diagram has several flaws. For instance, you'd need a join to synchronize the camera recording and the timer. But then, the semantic would mean that both activities must be finished ...
- 82.2k
7
votes
Accepted
Why is CMYK more suitable than RGB for printing?
If you are working on image editing or graphic software, you probably wonder why you'd need to provide some more thoughts about color models:
Colors you see on a screen are sent from a light source. ...
- 82.2k
7
votes
Should I model constraints which are valid, but which have no current function in the domain?
In the past, I have experienced both kinds of situations:
cases where a system contained things like constraints which were surely added in good faith, but were never really needed - and later turned ...
- 220k
6
votes
Accepted
Models: two very different concepts
One issue with these discussions is the all-to-frequent mixing of different architectural viewpoints in the same discussion or diagram.
Some architectural viewpoints are meant to show depth: deep ...
- 34.8k
6
votes
Should the Model be able to persist itself? When?
No, it should not.
Especially these days, a model will have multiple persistence locations (DB, cache, backup) and a few other forms that are useful to be decoupled from the store (human readable, ...
- 110k
6
votes
Accepted
How to model classes that can be extendable?
How to model classes that can be extendable?
In the field of software development, extensibility specifically refers to inheritance, and inheritance is not the correct approach here.
The above class ...
- 59.5k
5
votes
Should a Controller have a Model object as an attribute?
Yes, this is quite common (python example, simple java example, java example using a list of models, and C++ example)
Why ? The controller must send commands to the model. So either it knows the ...
- 82.2k
5
votes
Should you pass an instance of service to a model class?
Give your InfoItem a generic onClicked event. At the place (maybe a factory) where the specific InfoItem objects are created (and hence their type is known), assign each of them an appropriate event ...
- 220k
4
votes
Models: two very different concepts
In MVC, the Model is anything that is not part of the View or the Controller. In MVVM, the Model is anything that is not part of the View or the ViewModel. That should be easy enough to remember.
If ...
- 201k
4
votes
Mapping between 4+1 architectural view model & UML
Although I agree with Thomas Owens answers approach to cater for your end-users needs, one thing that is failed to be mentioned is that the reason why the original definition of the "4+1 View Model ...
- 41
4
votes
What's the purpose of multiplying by 1024x1024?
The fact that this shift is done one way and then in reverse later suggests that this is perhaps a hack to provide use extra bandwidth in these values. That is, the 20 low-order bits are being used ...
- 30.9k
4
votes
Accepted
UML - Design Class Model diagrams
There are many UML diagrams. You are obviously referring to an UML class diagram:
Yes: you choose the level of details that you want to show in your diagram. So you can very well decide to show ...
- 82.2k
4
votes
Accepted
Should the Model be able to persist itself? When?
It depends. There can be scenarios where this is suitable:
When you don't implement a larger "enterprise system" or real business software, but something smaller, maybe something like a ...
- 220k
4
votes
Placing business logic on a not so small/big project
We’ve learned over the years that most small projects grow over time. What starts as simple CRUD applications evolve into business critical systems and complexity increases exponentially. Sooner or ...
- 4,984
3
votes
Accepted
What domain objects might I need to represent a user and users profile in a forum web application
I’ve been trying to get a firm understanding of the MVC design pattern
Model View Controller is an impossibly simple pattern. As long as you have something that focuses on the model, the view, and the ...
- 120k
3
votes
Accepted
Is it okay to pass my model into my view model via its constructor through MVVM practices?
Personally I would not have an issue with the view model constructor taking an LDLTrack and using it to populate itself. That's a fairly tidy, well-encapsulated way of doing things.
What I wouldn't ...
- 843
3
votes
Models: two very different concepts
The model is not "everything else". The model is the number behind 3.14159... It is not "3.14159265". It is not the button you push to get pi. It is not the paper you write π on. It is not the ...
- 120k
3
votes
Accepted
Model "Clones" Adding Complexity to N-Tier MVC Project?
It sounds like your friend is suggesting a more ADM (Anaemic Domain Model) approach.
Essentially you just have your Method-less DTO model and use it through all the layers. Your Data layer is not ...
- 84.4k
3
votes
Design suggestions needed to create a MathBuilder framework
You sound like someone who has minimal experience with software design. And for you I have one golden advice : DO NOT CREATE A FRAMEWORK! (all caps for emphasis).
If you try building abstractions now,...
- 38.2k
3
votes
Accepted
Meaning of Using BitVectors to Model Integers to account for Overflow
The thing that many programming languages call "integers" are not actually integers, they are fixed-size bitvectors interpreted as integers … but because they are fixed-size, they can "overflow", ...
- 105k
3
votes
Accepted
Why is there no UML or other model added to the DOM specifications?
W3C technical reports such as the DOM specification are authored with the ReSpec tool. Interfaces are described with the language-agnostic WebIDL interface description language. It would in theory be ...
- 136k
3
votes
Django Fat Models: Where should I put model creation logic?
I would recommend create classmethod on ReceiptItem. In large code bases, you want model instance creation logic to be not spread all around your code base.
Think what happens when in future you ...
- 131
3
votes
Placing business logic on a not so small/big project
Not sure if it will help with the question, but I have a few qualms about your design:
When I see "Service" I expect something more or less stateless. With or without a domain-driven ...
- 8,694
3
votes
Should I model constraints which are valid, but which have no current function in the domain?
The first constraint may be violated in the case of a legal guardian, who is not otherwise a relative. Also, it relies on having multiple age fields filled out, which may pose certain practical data ...
- 7,891
2
votes
Accepted
How can we make Use Case Model in UML for given Statement?
Regarding point 1 (News mobile application is accessible in urban and remote areas using internet services): This is not the description of a use case. but it is a constraint on the architecture of ...
2
votes
Can a model have itself as a foreign key?
For those who are still looking for the how-to in Rails.
2
votes
Models: two very different concepts
In clarifying the term Model, let us start with the definitions in Trygve Reenskaug's original notes on the MVC concept written in 1979.
A Model is an active representation of an abstraction in the ...
- 21
2
votes
What is "serverless mesh"?
I'm wondering if this was someone's mash up of "service mesh," and "serverless." As mentioned in the comments, both of these terms are used more than understood.
To clarify though, you run a service ...
- 131
2
votes
Architecting a predictive modeling software
Management has a wish to bring down the run-time within 15 mins.
Start measuring your code to find out where the "hot spots" are. Hot spots are the places where your code spends the most time ...
- 201k
Only top scored, non community-wiki answers of a minimum length are eligible