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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1answer
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SOA vs Client-Server-Dispatcher vs Broker

I have a few questions regarding the three architecture patterns mentioned in the title. I'm having a little trouble trying to understand the advantages any one of them has over the others, especially ...
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1answer
99 views

Share models between several monoliths

I want to build an app that will have have several monoliths. My question (similar to this one) is, how do I centralize User model between these apps, i.e. how to deal with user management/...
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1answer
141 views

Event sourcing access by reference

In an event sourcing architecture, what is the typical pattern for passing information about related objects (aggregates)? For example, in a order processing system, should OrderCreated event (...
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1answer
36 views

where to put business constraints

We have a 3-tier architecture: Web, Business, Models using the MVC pattern. Models are Code-First using EF6. Currently we access the dbContext directly in our Controllers to query and save changes. We ...
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4answers
268 views

Passing Information to a method using primitives vs and object instance

I have trouble understanding if I should pass an argument to a method as a primitive value or as an already-obtained object. Consider this simple example interface Channel{ String getId(); ...
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0answers
43 views

Correct event managment architecture in web application

My team and I are working on a large web application, and I've noticed that we're working in a way which I believe is an incorrect usage of flux (probably from lack of understanding). We're using ...
0
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1answer
54 views

Should libraries be packaged together based on similar traits?

I just started a new job and one of my first tasks is to create local nuget packages from the existing libraries, to help with versioning, maintenance, etc. This task had already been started by ...
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2answers
829 views

DDD enforcing business rules

New to DDD I have a simple case a I would like to model using DDD approach 2 entities Student and Course Relevant property for Student are StudentId and Budget Relevant property for Course are ...
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3answers
2k views

Are there any well known alternatives to the SOLID principles for OO programming? [closed]

I´m looking for some kind of better compilation of principles which takes the old basic concepts (DRY, KISS, etc...) and applies them to OOP related concepts like abstract clasess, interfaces etc... ...
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2answers
1k views

Multiple processes in single microservice

We have a microservices architecture very similar to the architecture described here Obviously, it's a simplified diagram of a real system. In our case, we have a requirement to perform background ...
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2answers
447 views

Architecting a distributed file processing system with leadership election

I'm in the planning phases of trying to build a distributed file processing system in Java and I'm looking for feedback and advice: Problem : There are a large number of files continuously posted on ...
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0answers
35 views

What should be the code architecture to download and cache offline data (Images/Videos/3d Models)?

I'm developing an application which has a 3D room. Each room is a 3d model and can contain media boards. each media board contains image(s) as slides or video. I have created following Data Models : ...
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1answer
613 views

When should I use Reactive web framework

When building a standard web Apis in Java world there is two ways I could do nowadays Use SpringMVC (Not Reactive) Use SpringWebFlux (Reactive) There are few benefits of using Reactive that I can ...
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2answers
42 views

Logic to create/update values while maintaining their uniqueness (in a multi-threaded environment)

Assume I have a dumb repository which stores numbers (for sake of this example). It is dumb because it may only create new record, update specified record and list all the existing records - no other ...
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2answers
419 views

Loose project coupling causes problems in .NET Core solution

we started a new project in which back end consists of several layers (each in different project). For simplifaction I'll define a few: Project.Data -data layer with access to db Project.Repository -...
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1answer
1k views

What architecture design is used to create a virtual queue?

What architecture design is used to create a virtual queue? A virtual queue, virtual waiting room or a virtual line can be described as: An online queue system which redirects excess end-users to ...
2
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1answer
61 views

Is there some solutions that enable to perfrom sub transactions on business model?

My question is in the header. I would like to know is there architectural solution that enables to perform nested transactions on the business model. Let me to explain - the standard flow for web ...
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1answer
70 views

Publish / Subscribe Paradigm Implementation Problems

Reading the final chapter 6 of the paper "The Many Faces of Publish/Subscribe" I stumbled across: Decoupling is a desirable property because it enforces scalability at the abstraction level,...
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1answer
1k views

Where and how to handle user password hashing in Clean Architecture?

I'm currently building a new application and trying to apply some of the principles of Clean Architecture. One of my first roadblocks is implementing my own Identity system (to avoid being tightly ...
5
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1answer
316 views

If your company ships multiple products, does it make sense to use a mono repo for your integration tests?

Assumption: Each product codebase is in a separate repo. If the product codebase was a mono repo, it would be a no brainer to just put them together. Assumption: Integration tests in this context ...
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1answer
1k views

Cross-aggregate operations, use domain service or domain events?

I'm refactoring a settlements module in a large healthcare application. I'm trying to follow DDD. Let me give you a short and simplified description of the refactored code: A patient has an ...
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5answers
1k views

Design pattern for creating object hidden from client

I am having difficulty understanding which design pattern would be best for the following scenario. An application uses a database. That database can either be the production version (SQL) or a test ...
0
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1answer
137 views

Breaking a website into a bunch of micro services

Imagine we have a website happy-cooking-together.com. (I made it up so if becomes available all of a sudden don't take it for real.) It's getting quite a lot traffic and multiple teams are working on ...
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0answers
17 views

Batch Syncing between two system and one system reverted its state to older DB state. Syncing Problem

We have a system which generates db records and a ever increasing id named archive_id ( bigint in postgres). sample table: record_table ------ archive_id bigint,info varchar Another system ...
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1answer
71 views

Separation of Logic and UI - Does the orchestration belong in the model?

I wrote an app with the MVP Passive View pattern. My solution has four different projects. A MyApp.Core containing all kind of business logic, a MyApp.Forms containing stuff related to WinForms (UI), ...
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4answers
891 views

Replace Conditional with Polymorphism in a proper way?

Consider two classes Dog and Cat both conforming to Animal protocol (in terms of Swift programming language. That'd be interface in Java/C#). We have a screen displaying a mixed list of dogs and ...
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1answer
353 views

How an async response is usually getting back to the clent in typical reactive highload architecture?

A typical highload reactive architecture is: (Q means queue) And usually arrows are from client to DB at such sketches. My question is how the response is going back? The same queues and other stuff?...
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1answer
237 views

what is the real use of JS/Jquery in Asp.NET MVC application?

I am planning to design a new web application using ASP.NET MVC 5. I used to write a lot of JS/Jquery code on UI when I was a beginner with Web forms applications. After reading/learning a lot of ...
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3answers
4k views

Microservices communication: Avoiding single point of failure

As far as I know, there are two commonly used patterns when dealing with services communication in a microservices architecture: Direct-calling other services. For example: Service A handles some ...
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1answer
270 views

Data Integration Design Using Microsoft SSIS

I am working on a data integration project, where I need to extract data from oracle source and load it to XML file. The requirement is to get the list of customers and foreach customer create an xml ...
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1answer
122 views

Writing Event Process architecture for multiple event handler interfaces

I am working on Java program which will listen multiple kind of events from multiple sources and store information to multiple sinks. Each interface will have its own source to listen and own sink ...
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1answer
80 views

What is the best Architecture / System Design to launch same app in different flavor and a bit different logic?

There is a company let's say "X" which mainly deals in Real Estate / properties and has a website (online portal) to display those properties. Just like any other big company when they saw a ...
6
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1answer
7k views

DTO vs. read model

If I understand the concept of read models correctly, then it's just a simple query to return a use case specific data set. But a DTO seems to have the same purpose, but in a more complex way (...
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3answers
115 views

Stop a process for human control if some score is reached (Screening System)

Say I have a blogging system. Users can create posts that will get automatically published unless some score is reached. So when users save a post, we do some calculations and add up some numbers ...
3
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1answer
619 views

DDD Application Service Architecture Question

I often run into this decision making scenario of where to call a Domain (or Application Service) when building my Domain Models. Maybe the confusion is in identifying whether this is a Domain service ...
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2answers
169 views

Microservice boundaries definition and dependencies handling

I'm reading a lot about microservices but one thing remains a bit unclear to me. Let's say in my organization, I have 2 abilities: Extract street names from one or more blocks of text Given a ...
0
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1answer
608 views

Android Clean Architecture - Seperate Usecases, Single Usecase, or not a Usecase at all?

I'm working on refactoring an older project of mine to follow the Clean Architecture paradigm (and loving it so far) and one of my components is causing me a bit of confusion in relation to whether or ...
2
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1answer
1k views

Should I Microkernel or Microservice my legacy ERP?

I have been working on an n-tier monolith application for a couple of years, and want to build a plan to transform this big ball of mud to a more maintainable system. I came across Software ...
4
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2answers
6k views

Can CQRS pattern exist without mediator pattern?

Can CQRS pattern exist and/or work without mediator pattern? I mean there are always commands and these commands have to be dispatched somehow to the handlers that perform some logic on them. Does ...
3
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4answers
2k views

Best practices for database backward compatibility

I am working on an app which has multiple versions deployed in the market. Different versions have modified databases and databases are to be synced between local storage and server storage by signed ...
6
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4answers
433 views

What are some approaches used in financial applications to prevent deposit/withdrawal sync problems?

I am currently facing a problem with an application that has deposit/withdraw functionality. The underlying database (Cassandra) offers no read/write locks. Now suppose user A has deposited 100$...
3
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1answer
2k views

Unit Testing in VIPER Architecture: Possible?

TL;DR There are no methods in VIPER which are returning any value so how to test them? Reasoning: In VIPER, each layer is communicating with other layer by holding an abstract reference to it (...
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1answer
83 views

How to architect a comunication of objects between 2 softwares (B2B, so called, communication)?

There's a 1st sofwtare (s1) that generates data and then there's one or more software's (s2, s3) that will receive that data(objects), based on pre configured actions that define the type of data to ...
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2answers
728 views

Is "evolutionary software architecture" a contradiction?

In my understanding, evolutionary architecture boils down to making architecture easy to modify. Now architecture is often defined as the things that you should get right early because they will be ...
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2answers
3k views

Web API : Centralize business transaction logic : Good Idea?

We develop on a ASP.NET Web API where we use the "Unit Of Work / Repository" pattern : Our Controllers looks like that : public class MyController : Controller { private IUnitOfWork _unitOfWork; ...
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1answer
2k views

Android - Clean Architecture - best way to structure packages?

Can you all take a look at my package structure to understand how i implemented clean architecture in android: if we take a look at the clean architecture diagram it looks like frameworks is apart of ...
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11answers
13k views

What does Robert C. Martin mean by SQL being unnecessary? [closed]

I've been reading/watching a lot of Robert C. Martin content. I've come across him saying SQL is unnecessary because of solid state drives. When I search other sources to back this up I get a bunch of ...
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3answers
23k views

Ways to share DTO across microservices?

My scenario is as follows. I am designing a system designed to receive data from various types of sensors, and convert and then persist it to be used by various front-end and analytics services later....
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1answer
938 views

Web page accessing local system via localhost HTTP API

I have seen this pattern that allows web pages to interact with local system resources through a HTTP interface and I have a couple questions about it: What is this pattern called? What ...
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2answers
2k views

Uncle Bob's clean architecture - Composed entities

I'm building an Android application, and trying to follow the Clean Architecture pattern. I am a little confused on what my entities should look like regarding some of my use cases. Example I have a ...

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