Questions tagged [design-patterns]
A design pattern is a general reusable solution to a commonly occurring problem in software design.
4,518 questions
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Is there a name for this anti-pattern? (reference to a class member passed to another class method) [closed]
Is there a name for this anti-pattern?
A reference to a class member is being passed to another class method, rather than having the class method set the class member directly.
public class ...
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How to design extensible data aggregation code to avoid manual updates in multiple places?
I have a data aggregation function that collects statistics from multiple sources. The problem is that whenever I add a new metric, I need to manually update the code in three different places, which ...
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OO design - Process that relies on the current state of objects
We have a CAD software extension, where you can draw products like walls, doors, windows, etc., and you can export the drawing as an order, which contains the parts and costs.
As part of this export, ...
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I'm looking for a design principle referring to using a system for it's intended purpose
Recently a junior team member was asked to use a survey tool to act as a system by which fuel delivery drivers could submit their Bill of Lading to our dispatch team for record collection after ...
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Best practices for serving encrypted files in Laravel?
I'm building a Laravel-based web application that functions as a personal online photo archive. Each user uploads and manages their own private collection of images. These images are encrypted at rest ...
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Design pattern for exposing different parts of interface to different entities
In a certain program I would like to have three objects, say, a, b, and c, with c being a shared private member (sub-object) of a and b. The data between the three objects shall only go this way:
a &...
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Optimal way to avoid iterating through each row in a dictionary of data/arrays?
I have an excel macro that imports daily share price files, and finds the highest price for a share after a given date.
Each of these daily stock price files has ~1000 rows of data. Currently I have ...
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Optimal way to match prioritized list of tasks with available workers
Problem
Match prioritized tasks with suitable workers.
Details
Consider a task with following properties - type and size. Based on task type, tasks are prioritized.
While a worker has following ...
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Designing a Clean Separation for API Sorting Parameters and Database Columns
I'm working with a data mapper called UserMapper and a User model. Currently, UserMapper has a method called find_many. Now, a client makes requests like /api/users?sort_by=+last_name,-birthdate, so I'...
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Designing a Scalable Caching Layer for User and Tenant Metadata in a Messaging System
I'm developing a microservice-based application that processes a high volume of messages. Each message must be handled according to the user’s personal settings and some tenant-specific (customer) ...
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Is it better to pass a specific “context” object to handlers rather than the entire domain object?
I’m designing a system where various “handlers” apply business rules to an object. Initially I had each handler receive the full domain object:
// A large domain object with many properties and ...
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When DI goes too deep - what is another architecture/design pattern you should use? [duplicate]
I like using dependency injection but sometimes I find that I have to nest some dependencies so deep that I would almost rather use a global variable (despite this being bad practice). Here is an ...
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Is it good DDD practice to hide all the aggregate methods behind domain services?
I'm working on a DDD-based system and was researching the best way to handle domain services and keep business logic consistent.
During my research, I came across this insightful quote from Steve ...
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How should User behaviour depending on role be design as OOP
Imagine I got user which might be either author, administrator, reviewer
An author have relation on book that he wrote.
An administrator have relation on banned user (we track which administrator ...
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Pattern for a chain of unreliable steps
I would like to refactor some code of a process that must perform a processing. The processing involves several steps, each of which can fail or go well. If successful, it must proceed to the next ...
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