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'.
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By creating an architecture, it is better to have many classes that handles different scenarios, or a single one that handles all? [duplicate]
During my limited professional experience, I have been involved in microservices projects with a common structure:
The Controller takes a request and validates it using the jakarta.validation....
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How to design fault-tolerant distributed "all-or-nothing" system?
I have a system where Client(C) sends request to Server(S0). S0 then sends the response back to Client that "request received" and closes the connection. C can regularly poll S0 to check on ...
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Best practices for team development with NuGet projects in .Net
TL;DR I want to change the way our current enterprise code base is constructed to utilize NuGet packages for the inter-project references, but that seems to present some challenges when considering ...
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How to reconcile the fact that dependency Injection break encapsulation? (Especially when others are allowed to wire up your dependencies for you)
I was reading Martin Fowlers take on Dependency Injection, and in general have been trying to discuss it a bit online to help get rid of my own misconceptions and to understand this principle better.
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Please explain the "swapable dependency" arguments for IOC containers
I get that IOC containers can be useful to help break dependencies and allow you to test a class in isolation. I don't wish to focus on that right now, instead, I'm trying to understand some of the ...
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4
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Design of API which is based on third-party implementations
I have 5 interfaces in an API component, which in its turn call an external 3d party solution provider (REST).
The goal is to make this component universal, and under the hood support multiple service ...
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UI or Application layer responsibility - retrieving additional data for display
I have an application service that retrieves Order data. The service is consumed in UI, where it can be edited by users.
Additionally, the users wants to see related data such as ordered products' ...
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Is it an anti-pattern to use interface for entity?
I read an article about that using an interface for an entity is an anti-pattern for these reasons:
Your interface signature is identical to your class.
There’s only one implementation of your ...
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Implementing MVC in C++ with minimal boilerplate despite lack of reflection
Powerful reflection capabilities make implementing nice architectural design patterns such as MVC and Dependency Injection very simple in languages like Java and Kotlin. In particular, reflective tags ...
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Centralize input validation across multiple Microservices
My company, which specializes in logistics and transportation, delegated the majority of the backend microservices to our team. All of the microservices (which our team inherited from "past ...
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Is RabbitMQ suitable for allowing SaaS customers to subscribe to events?
I work on a SaaS system which is generally a single-tenant environment. Customers (whom the SaaS instances are for) would like a way to subscribe to events, such as updates of certain data entities. ...
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What is the name of the approach (practice) when several unrelated entities are returned at once in the response to a request [closed]
For example, for a mobile frontend, you need to get all the data for rendering at once. The interface is divided into blocks, in which there can be both blocks with a catalog (categories) and other ...
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How to handle concurrently caching expensive request data in postgres?
I have a kubernetes deployment which is fielding expensive (but cache-able) requests, let's say a website scraping service (not really) which takes about 15 seconds to scrape a website. In my backend ...
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In the usual "3-layer" architecture pattern, where would one best create dynamic, user-readable strings?
I've been trying to build this (principally desktop, but could eventually be turned into a cloud app) document editor program for a while and have it laid out using the broad principles of the 3-Layer ...
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Pattern for Nuget Package (Abstractions, DepedencyInjections, etc.)
I've been interested in following what other successful libraries are doing with their nuget packages. Unfortunately, I can't seem to find any materials to read online and I don't even know what to ...
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Handling a single event as broadcast and round-robin depending on service
I have Service A that publishes an event to RabbitMQ. I have two instances of Service B that will use the event to write to its database. I have two instances of Service C that will send the event ...
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In the state pattern, what happens when the action doesn't depend only on the state?
I have some doubts about the state pattern, but I think it is better to ask one question at a time, so it is easier to focus on the answer.
The state pattern establishes which actions can be performed ...
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two diffrent database in unit of work
I will explain my problem in the form of an example.
Suppose we want to use both databases in a transaction.
Data is edited in database 1 (for example, Postgres) and then added to database 2. Finally, ...
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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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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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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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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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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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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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538
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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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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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292
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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 ...
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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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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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681
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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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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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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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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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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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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, ...
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4
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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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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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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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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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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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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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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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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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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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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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