Questions tagged [architectural-patterns]
An architectural pattern is a general reusable solution related to the high level structure of software systems. For reusable solutions having a more specific scope (e.g. individual classes/components and their interactions), prefer the tag 'design-patterns'.
388
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Layout of python source code structure for a project that both exposes an API as well as applications [closed]
I have just inherited ownership for a smaller Python project. The project currently implements a set of command-line (CLI) applications related to data management at an organization. It also ...
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2
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89
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Using multiple databases in a bounded context
Sometimes we have to use multiple databases in one project
with the intentions of:
Denormalizing data or read models
Using the advantages of that database (technology)
There has been a lot of talk ...
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2
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83
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Workers and orchestrator
I’m working on a system where we have several scheduled long running operations.
In our case this is website crawls that we perform for customers. The current setup is pragmatic where we have one ...
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2
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82
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JavaScript: Change prototype chain to morph objects from a deserialized JSON to business objects
This post assumes, that dtos on the UI side (SPA) could be viewed as business objects in almost all cases - except that the business logic is missing. I'm fully aware that a dtos first responsibility ...
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3
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218
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What is the difference between these two MVC diagrams?
I want to understand what is the main difference in these two diagrams when it comes to the Model-View-Controller pattern. If there is a difference, how should I choose to construct my program? What ...
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Most relevant objectively-quantifiable reason to choose to use an object method vs. a function that just accepts the object as a parameter? [closed]
When writing code in a programming language that has the option of creating standalone functions vs. methods of a class or struct, what is the most relevant objectively-quantifiable reason to choose ...
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How can I prevent an object from being re-sanitized everytime it is passed as input to a function?
Suppose that I have a class named CharStream
Additionally, there are a large number of functions which convert their function input into a CharStream
def funky_the_function(_input):
input = ...
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1
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118
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How to decomposing a single bounded context into multiple microservices for organisational purposes?
I have a monolith implementing what is basically an ETL process, receive data from external system, orchestrate the processing of it, and then pass the results back to an external system. (The ...
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1
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1
answer
55
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How to deal with mixing models between services?
I am working on an API that has a User resource to represent the current user and a User service that handles business logic for representations of this user.
I need to introduce an Organization ...
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3
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212
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Using Repository Pattern with .NET Entity Framework with a single Get method with optional parameters for each table include
We have a very messy data repository component, with dozens of methods to interface a DbContext (entire database) in Entity Framework.
It was (and is) coded in a way that adds a new repo method for ...
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1
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104
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Architecture review for desktop application with distributed components
We are planning on building a desktop application with a few web components. I want to know how resilient is this architecture.
Essentially the design looks like
Mixing web components with desktop ...
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1
answer
167
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Microservices Pattern - Downstream Services Registering Themselves with an Upstream Orchestrator?
I'm looking for some guidance on a design proposition I have to accomplish the following use case:
We have several small microservices that each generate a unique set of "analytics" or ...
2
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1
answer
131
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Design for the future or make it tightly coupled to the implementation
My question is regarding how would the developer know when you add interfaces/protocols to their code and inject them as dependency.
Consider an example of BudgetService.
protocol ...
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2
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399
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Implement message queue in API Gateway
Recently we have this client who asks for a API Gateway solution, in this case it’s Kong. Currently, they have 10 services (200 APIs) that are running on really legacy stuff (built with C++ and ...
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1
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330
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Server-side Long Running Tasks
I am trying to decide on which approach to follow for long running tasks.
Web Client (user) story
Web client connects to the server (REST API + WebSocket for real-time notifications)
Web client POSTs ...
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0
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1
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556
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Three layer architecture and using DTOs to transfer data between layers
I have a 3 layer architecture application with presentation layer, business layer and data access layer. UI -> BLL -> DAL UI Layer has reference to only BLL and BLL refer only to DAL.
My BLL has ...
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How to have only one consumer handle a long running task at a given point?
I need to design an application which makes requests to an external API. External API has a hierarchy of entities: User which contains ListOfItemss which contain Items. I need to get data on all Items ...
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Microservice Architecture For Blog Posts With Media Content
I was reading the guide about microservices from https://microservices.io/ (still very new to this architecture) and had a question about a design approach.
Let's say i have a blog applications with ...
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2
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206
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DDD rich domain model - dynamic dependencies - EAA
class Product...
public static Product newWordProcessor(String name) {
return new Product(name, new CompleteRecognitionStrategy());
}
Martin Fowler presents this code in his book "Patterns of ...
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1
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92
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How to automatically calculate the norm for users in our time registration application?
I'm creating a time registration application for employees where they can register their hours.
I want to show the users their "norm" (not sure if this is an actual word or just made up by ...
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2
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118
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Applying Domain Driven Design to applications with both reading and writing heavy logics
We are planning a complete rewrite of a very complex project (10+ years, ~15 different application modules) and we would like to adhere to DDD and CQRS as much as possible but we are struggling to fit ...
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3
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88
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Separating network logic from business logic
I am creating a simple P2P file sharing system, where one peer can send some Objects (e.g., String, custom objects, etc...) to another peer.
The peer, that receives the Object, can then manipulate it, ...
0
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4
answers
367
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Avoiding Synchronous Communication Between Microservices
Something that annoys me when reading about decoupling microservices is that the problem is often stated, with either poorly explained, bad, or no solutions provided, which seems to especially be the ...
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41
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Design pattern for scheduling method calls (open-loop control) [duplicate]
I have an ERP-style system that needs to allow users to orchestrate an Entity.action() on a variety of objects that implement the Entity interface, at different datetimes. Calling action() would ...
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151
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Is it OK to use a Command Sourcing instead of Event Sourcing? Replay events in Commands-Repositories
I have a system that uses a graph database without any ORM, mapper or tool that tracks entity changes, like EntityFramework. I'm not using domain entities, instead I have an Event that calls changes ...
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1
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48
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Intraservice Communication Using Kafka
recently i came across an architectural diagram in my organization, where a backend service sends messages to itself using Kafka, so basically it queues the messages and reads from the queue and ...
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2
answers
92
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Coding style for a micro-service across organisation [closed]
Background/Context:
A big organisation has several departments, those departments have several business units and those business units are divided into domain teams. Assuming domain teams are atomic ...
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2
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134
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Appropriate design pattern for coupled Objects
I code an Object-Oriented simulation where you can have a Unit move on a Terrain. The cost of such move depends both on both Unit capabilities and Terrain features: a boat can move on water, a plane ...
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How big should database adapters/gateways be?
Outline
When you build an Adapter that connects your application and the database,
How big should you make this adapter? Should it contain all possible queries that could be made to the DB?
Do you ...
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2
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190
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Microservices that needs to change row in shared DB
I have an application that can be reduced/simplify to this flow:
user sends request to app A
app A inserts info about the request and user into DB ( marked as "B in progress" and "C in ...
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2
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135
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In an "Always On" architecture, how are duplicate concurrent transactions handled?
Imagine a scenario where a gift card has been purchased with cash, the gift card is duplicated, and each card is used to purchase an iPad at a self-service counter at exactly the same time.
What are ...
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1
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111
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Are Microservices Architecture and a Single Customer View able to co-exist?
Given the microservices pattern is the decomposition of software by business capability with ownership of state, and a single customer view is an aggregated, central, "single" data store of ...
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3
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Synchronous vs Asynchronous Event Driven Architecture
I have been searching extensively about the difference between synchronous and asynchronous patterns and how this relates to event driven architecture. On its face it is quite obvious, I simply ...
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How do Singletons differ from Static variables?
Although I do find some (apparently old) posts on the topic on the web, I could not find one here at SE. Thought of raising this here to see if what I read is accurate/is all there is to it.
So ...
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94
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How to handle functional differences in an app in different locales?
I'm working on an app that needs to be localised for two different countries, let's call them Atlantis and Buranda. As well as translating the site into the relevant languages and displaying dates, ...
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144
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How to model an event-driven system for replays
Let's say I have a system to which I can upload documents via an API. There are three services:
the UploadService - responsible for providing a HTTP endpoint
the StorageService - responsible for ...
0
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2
answers
203
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Accessing Hardware-based resources from multiple worker threads
I have a technical application that interacts with different hardware components: measurement devices, sensors, custom hardware. These use dedicated interfaces like USB, serial ports, TCP/IP ...
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1
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101
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Designing a model for a small business which provides multiple services which generate documents [closed]
I am designing a system for a company which provides multiple services to users, all of which generate a document. The documents all have a validity period. Some of the services can be grouped, and ...
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100
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Should we test private data (static objects in this case) to make sure it maintains its structure?
I had a discussion at work about whether to unit test a private static object we're using as data for a public component.
const data = {
45: { name: 'John' },
2: { name: 'Patricia' },
27: { name: '...
2
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1
answer
242
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Wrapping a legacy C++ codebase with a C API
I have inherited a large C++ codebase implementing various Windows desktop applications, services and libraries using Windows MFC. There are no automated tests. We need to decouple the UI and retain a ...
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1
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27
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Modularized authentication providers for Spring application
At our company, we have multiple products which share authentication settings. In particular, we use Spring LDAP, but since our use case and configuration is more complex, we would like to use ...
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130
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How to show only most recent items in most efficient way?
Consider application where users rates products (e.g. 1-5 stars).
Through passage of time, there might be millions of records. One can create desired indexes and/or keep sum and count of all ratings ...
5
votes
3
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530
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Better to store references to an object, or to store its ID and retrieve it with a hashMap
Given the classes:
public class SocialNetwork
{
private final Map<String, User> users;
...
}
public class User
{
private final String user;
private final LinkedList<String>...
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Streaming Market Data Over The Public Internet
I'm currently working on a design for a system that can service market data to external clients over the internet. The current solution involves consuming market data from a feed (Feed Handler), this ...
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534
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MVC vs Layered vs Client-Server
On this book (Software Architecture, 10th Edition by Ian Sommerville, ISBN: 9781292096131), the following architectural patterns are presented (Chapter 6, 6.3, p175):
MVC
Layered
Client-server
...
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How should you structure the front-end/client to interact with a web app microservice?
I've been grappling with this for a while and figured I would post here to get input.
I am a full stack engineer. I work on both front end and back end apps, where sometimes I have to create new ...
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1
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600
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Application settings in relational database
There is an application of ours which has some experimental features. We want to enable it when user wants to enable. So they will change it in the UI and we are saving those to DB.
So we added those ...
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2
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326
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DDD and bounded contexts: can a context be mapped in multiple microservices?
Let's suppose that I have two bounded contexts: A and B.
In books I'm reading authors will only write "Context A maps into Microservice A".
Now I'm working on a project (university ...
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1
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158
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How to deal with master data in a microservice environment
Hey Software Engineers
Currently we basically have a what I would call "modular monolith".
A diagram would likely look something like this:
What we want to do in the future is being able to ...
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2
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How widespread is the use of hexagonal architecture (ports and adapters architecture)? [closed]
We are discussing the adoption of hexagonal architecture (ports and adapters architecture) in our team.
Sometimes I use the rate of adoption as one rough metric about how beneficial a certain practice ...
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