Questions tagged [design-patterns]
For questions requesting extra attention to be paid to the usage of design patterns in the code.
1,420 questions
9votes
2answers
332views
Simple LRU cache implementations in C++20
LRU cache is a classical design pattern frequently questioned in programming technical interviews. It is best illustrated with pictures. Here are two examples. The following are two alternative ...
- 190
4votes
3answers
329views
numpy array/item handling functions
Recently I have been using numpy arrays, which have great utility via their broadcasting methods. I am attempting to write a useful public facing library, and this ...
- 237
4votes
2answers
520views
Simple Java program to aggregate lines of a text file
I have just written a small application to aggregate the lines of a text file, for example to group the lines according to the frequency of IP addresses in a log file. Would the code be sufficiently ...
0votes
1answer
62views
Bulk conditions evaluation throwing a single RuntimeException exception
Bulk conditions evaluation throwing a single exception of a configurable type for all unfulfilled conditions. It is developed around several design patterns: (1) fluent interface to configure the ...
user289021
1vote
1answer
110views
Database design using Closure Table for tagging system
I created these database tables with the inspiration in NjDevPro github repository. The design uses Closure Table for implementation of hierarchical tagging system in ...
- 37
4votes
2answers
111views
Managing file paths in a python Data Science project
When doing Data Science projects, I often have to load data and metadata, and output results, plots, logs, etc. Therefore I have to handle all the file paths from where to load the input and write the ...
3votes
0answers
53views
Structure of nested Divs with a table
I'm a new frontend programmer. I'm making a web site with flask, and to be honest, I don't know much about front-end so I don't know if what I'm doing is best practices. In one section, I have a div ...
- 31
5votes
2answers
124views
Argument Order To Determine Order Of Output (Python; `attrs`)
Feedback Request Is the manner in which I use attrs adequate (i.e. designed well)? Should I not expect to be able to use argument ordering to order the joining of ...
- 262
1vote
1answer
88views
[Spring Boot][REST] Design Pattern Best Practice (Single Entity, multiple business logic implementations)
I have some problems regarding best-practice design between data source layer(Entity), domain layer(Service) and presentation layer (controller): I have one entity with a type field in the database to ...
0votes
1answer
111views
Refactoring Agreement Status Logic: Applying SOLID Principles and Separating Logging/Auditing with Decorators
I have some production code that contains a lot of repetition and mixes business logic with auditing and logging. I've made two attempts at refactoring it, primarily using decorators. I'd like to get ...
- 131
4votes
1answer
104views
Sequentially bidirectional find the indexes of an element into a collection (after second thought)
The util class to find all the indexes on an element into a Collection supports forward and reverse lookup starting from a given index along with changing the ...
user285812
3votes
2answers
196views
Data pipeline that handles errors and cancellations
I have code that concurrently reads data from a stream, processes elements, and writes the data to another stream. Each of these individual operations may fail, in which case I want processing to halt ...
- 133
6votes
0answers
150views
Replacing tags in email
I have multiple tables and multiple email templates which will need tags replacing. The data for the tags depends on the recipient id as the data will need to be fetched from different tables. I have ...
- 61
3votes
1answer
157views
Mail Client - Displaying email details for selected JTable Row
I'm trying to write a very simple IMAP email client in Java. There is one table per account with multiple multiline rows. The last selected row of one of the tables should be displayed in an extra ...
6votes
1answer
109views
Service Locator C#
I made this service locator to be used on my game projects, but it uses pure c#. Basically, new services needs to inherit from the common IService interface to be registered. I also added events to ...
- 97
