Domain-driven design (DDD) is an approach to develop software for complex needs by connecting the implementation to an evolving model.

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What is business logic code and what is data access code, and what's the difference?

I ask this because it seems people usually consider the code that goes into a DAO or Repository implementation as "data access code", while the code that directly uses these DAOs/Repositories as ...
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2answers
198 views

Is this too much work for a Gateway to do?

I'm writing a Gateway class that wraps access to a web service which provides information about a player's item inventory in a video game. This web service returns a variety of information, however I ...
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1answer
156 views

Single source of truth within an enterprise distributed system

Within an enterprise distributed system I have many services - an ecommerce service, a CRM, support desk, finance, billing. Many of these services share common data, such as Customer data. These ...
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48 views

A layer of abstraction too far?

Using an enterprise service bus, a message translator pulls a message off the queue ready to be consumed by a service. The translator picks up the message in a canonical data model (CDM) form and ...
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25 views

DDD Request Validation Handling

I stuck somewhere that I can't find a solution! There are plenty of validation questions here, but as far as I see, most of them were asking about entity validation. But what about request validation? ...
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34 views

DDD: Put logic in service or aggregate root?

Let's say we are building a document management system. One project has many documents. I decide to make projects as aggregate root. If the logic to add one document into project is complicated, I ...
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1answer
62 views

DDD – duplicity between Aggregates – should I use one table?

I understand that there exists duplicity of data between Bounded Contexts. The thing is that I'm not really sure about duplicity of data between Aggregate roots. Example: I have product in Product ...
5
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1answer
125 views

DDD Architecture in a MVC web application

I am putting together a web application using DDD however am strugleing to put the text book DDD model into a real world MVC application. I currently have these layers: Controllers > ...
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2answers
142 views

Domain driven design, can two aggregates have the same root?

For the purpose of separating different functionality into different classes, I have two following Aggregates: ActiveEmployee AssignTask () ReassignManager () Deactivate (string reason) ...
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22 views

Controlled access to list of entities vs get/set access in domain model

When designing a domain, either way of following approaches can be used to access list of child entities inside a parent entity. 1. Get/Set Following approach is straight forward and simple to ...
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1answer
58 views

DDD - map or object

What is correct by DDD - should I create map of two objects eg Map or should i use more meaningfull object that will contain this pair MoreMeaningfullName{Obj1, Obj2} ? If using first approach, I ...
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2answers
369 views

Conceptual mismatch between DDD Application Services and REST API

I'm trying to design an application that has a complex business domain and a requirement to support a REST API (not strictly REST, but resource-oriented). I have some trouble coming up with a way to ...
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2answers
100 views

DDD using an ORM and a Active Directory Server for Persistence

With Domain Driven Design one would model out the domain. One would then use an ORM of some sort to take care of the persistence. Say you have a Product entity which has a Name, SKU and an Owner. This ...
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2answers
345 views

What is the best way to create DTOs from entities and update entities from DTOs in a layered architecture?

Option 1: At first I would make a call to my service layer, which served as an API for my core domain, to get a domain object or a list of domain objects and then pass them into the assembler which ...
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1answer
255 views

Doubts about architectural pattern for customizable standard enterprise application [duplicate]

My company needs to build an application to be rolled out for a lot of clients. This software will have many modules and functionalities, but some of these will need specific adjustments for some ...
0
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0answers
21 views

What is the best way to create DTOs from entities and update entities from DTOs in a layered architecture? [duplicate]

Option 1: At first I would make a call to my service layer, which served as an API for my core domain, to get a domain object or a list of domain objects and then pass them into the assembler which ...
3
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1answer
242 views

Domain Driven Design - designing Aggregate Roots

Imagine you're designing an application for organizing Workshops. Workshop itself is quite complicated - it acts as a state machine with multiple possible states and transitions between them. We're ...
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3answers
127 views

Approach to designing a workflow web app that contains some automation

I have been tasked with creating a web application which will provide end-users with a self help workflow, asking them questions and skipping to another part of the workflow depending upon the ...
11
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2answers
394 views

How do you handle shared concepts in a microservice architecture?

I am researching architectural patterns for an application I'm developing and a microservice approach seems like it would be a good choice but I am not sure how to handle interactions between the ...
2
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3answers
106 views

Design ideas - validation based on conditions outside of the domain

I am facing a very interesting problem here, and I'd like to see some design ideas from domain driven design perspective. To make it easier to express what I need I have following hypothetical ...
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2answers
175 views

Implementing an anti-corruption layer with domain logic

I'm building an application that compiles a single PDF document from multiple source PDF documents as follows: it takes the first page of each source document, stamps certain information on top of ...
2
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4answers
140 views

Design: How to handle user permissions across a system

My team is currently working on a massive refactor of a medium-sized application in PHP. We are doing our best to refactor our code on a module (Orders, Users, Products) basis. The issue that I am ...
2
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2answers
58 views

Domain Modeling - Offerings vs. Usages

I have a question about an issue I always seem to run into when building a domain model. The issue comes up whenever a domain object is used in what I am calling an "offering" scenario and in a ...
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2answers
53 views

What layer generates commands for dependent services?

Our business works with truck drivers making pickups/deliveries of containers. The location of containers needs to be tracked. The drivers use mobile devices to generate a "DriverReport" (a log of ...
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2answers
207 views

DDD - Aggregate root with large number of children

I'll preface this question by saying I am relatively new to DDD so I may be making some fundamental mistakes here! I working on a project which involves the concepts of Accounts and Transactions (in ...
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2answers
121 views

How to use DDD to solve a common address situation?

This is a simple example to show a situation that I find hard to solve with DDD. Consider this: - A property (e.g. a house) has an Address. - An address can be complete or partial (country only; ...
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1answer
52 views

domain driven design value object behavior

I recently finished Steve Smith and Julie Lerman's excellent Pluralsight course on Domain Driven Design, and I'm applying the training to a project. I have what I think is a good candidate for a value ...
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131 views

Object Oriented Analysis and Design and DDD together

I fear this question seems to broad, so I'll try to explain what I mean with some detail. I couldn't, however, find a way to divide it into other questions. If that's really the case, I gladly accept ...
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1answer
147 views

DDD friendly N-Tier alternatives

In Eric Evans book on DDD in the Modules section he says, [tiered design] is attempting to address two legitimate issues. One is the logical division of concerns: One object has responsibility ...
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1answer
86 views

How does this kind of application and DDD relate?

In Domain-Driven Design the application is divided, as I understand, into four layers: Presentation Layer Application Layer Domain Layer Infrastructure Layer I understand this well, for instance, ...
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1answer
131 views

DDD - Effective Aggregate Design Questions

I just read Effective Aggregate Design, by Vaughn Vernon. Summarizing the takeaway: Model true invariants Design small aggregates Reference other aggregates by identity Use eventual consistency ...
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4answers
102 views

Handling DomainExceptions using REST endpoint

Suppose I'm doing some DDD. Now, I have a microservice reflecting a bounded context/a part of a bounded context. Now, suppose there is a REST endpoint: '/somedomainmodel/someaction' My API user is ...
2
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1answer
41 views

When there's no 1-1 mapping between subdomains and bounded contexts?

Reading this question and the accepted answer we see that although we would expect subdomains and bounded contexts to match that's not always the case. The person who wrote the accepted answer states ...
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3answers
126 views

Enterprise application object oriented modeling for user and role

Generally in the Enterprise Applications like ERP or ERM, CRM, BP etc. we see two things a lot, one of them is Role and the other one is User. What happens is that in the real world we have some ...
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1answer
147 views

What are subdomains, really?

In studying domain-driven design (DDD), I've come across the concept of subdomain, but I think I don't get it yet. My first understanding of this was that a subdomain is a subset of the domain of the ...
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1answer
193 views

DDD Validation best practice: entity containing data dosen't have the context to validate before data is set. Where should set function be?

I am pretty new to DDD, so bear with me. I have a Chat room and people in the Chat room. The people in the chat room need to propose a date they would like a webinar to be on. we have a bussiness ...
4
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1answer
262 views

Should I be using separate 'domain' layer?

I have been reading a lot about domain layer and DDD. However I am still confused about it. To me they seem to be a fancy name for business classes however more modelled towards your application ...
2
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2answers
208 views

Repository Pattern and custom queries/REST API. Is it the right approach?

I'm in the early stages of working on an application that is using the Repository Pattern to provide a data access abstraction. This application will have some form of a simple REST API but I'm not ...
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1answer
188 views

Does snapshot change tracking break DDD principles?

I'm building a website with MVC 5 and Entity Framework 6, implementing the Unit of Work & Repository patterns, and - for flexibility and performance - would like to utilize Entity Framework's ...
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1answer
37 views

How to model parallel processes (in a Bounded Context) with the same data store?

The situation. Let's say a background process puts stuff into data containers. It runs all the time, observes system events, and populates the data accordingly. The user may launch a control panel ...
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1answer
36 views

Domain Analysis vs System Analysis

I am trying to determine the differences between systems analysis and domain analysis. It seems that any systems analysis occurs within a domain--so are there techniques, concepts, tools, etc. that a ...
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1answer
296 views

Is DDD any good nowadays? [closed]

This is not a rant about DDD but rather some experiences and observations I've made through the past 2 years since I first learned about it. With this post, I'd like to hear what other programmers ...
2
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2answers
104 views

Should ids be mapped to the implementation type

This is a question of model design, and hopefully some architecture nerds have strong opinions on this. I've been developing one that I will post in an answer. Typically, in every codebase I've ever ...
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2answers
52 views

Is it normal for service methods to correlate to your views?

I've been working on learning how to implement domain services and view models in my project and have noticed a suspicious trend: When obtaining data for views from my controllers, if my domain ...
2
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1answer
65 views

Integration between services in a SOA

Assume we have a Bounded Context for Inventory (InventoryBC) and another one for Shipments (ShipmentsBC). These 2 BCs need to communicate together. They are hosted on 2 different services on different ...
0
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2answers
181 views

How to add new child entity to a repository in DDD?

I'm new to Domain-Driven Design and I'm using it in an application I am developing. I'm getting stuck on how to put new entities into a repository. My repository is just a big collection of entities ...
0
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1answer
90 views

Event Storming: How to phrase a command initiated by an actor, and where to put it software-wise [closed]

In Event Storming, there are "Commands" (blue sticky notes) which are, in most cases, triggered by an Actor. How should these commands be named, prosa-wise, especially in relation to the actor? ...
0
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1answer
135 views

What is eventual consistency?

I've heard people talking about "eventual consistency" (for example in this question and this answer). What is "eventual consistency"? How does it compare to "transactional consistency"? When does it ...
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1answer
90 views

Starting a big application with unit testing [closed]

I am learning test driven develeopment and read some books about TDD. I learned rules of unit testing. How can I write unit test, how can I select test method names, Act, Assert, Action and like this. ...
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2answers
235 views

When is it appropriate to map a DTO back to its Entity counterpart

From what I've read and implemented, DTO is the object that hold a subset of value from a Data model, in most cases these are immutable objects. What about the case where I need to pass either new ...