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 name of the design with this kind of implementation? [on hold]

I have DDD background, which Application Layer is business activity. It allows state to reflect business situation. And Domain Layer represents business information. It allow behavior to perform ...
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35 views

Where should commands be issued from a CQRS application?

Let's say I have a very simple CQRS application for communicating with some Suppliers. I'll upload some Orders to each Supplier's FTP account. I decided for 2 bounded contexts. One for managing ...
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21 views

MVC Application Extension reusing the service / dao layers

I am about to start my own project spun off a greater Opensource project. I am trying to get my head around best practice, both in terms of application portability and stability. To explain: ...
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50 views

Separation of concerns between repository and service in DDD with complex entities

This probably seems as an example of opinion-based question, but I'm actually looking for rationale on how to decide correctly, I believe there is a correct solution that can be backed by solid ...
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1answer
55 views

Is there any reason to override Equals for an Entity?

An entity has identity, which implies there should only be one object (e.g. a particular customer) in memory. As such, reference equality (which is what the base version of object.equals checks for) ...
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2answers
180 views

Is this a good Visual Studio solution structure for a domain driven design RESTful web service?

I am building a .NET 4.5 C# Web API RESTful solution and I would like someone to tell me if my project solution is correct and/or wise(-enough?) for a solution designed using Domain Driven Design, ...
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4answers
143 views

Domain model associations that do not required the behaviour of the associated object. How to model?

I've been struggling with this question for a while. I'm specifically thinking within the object orientated domain model. Let's say I have two entities. A supplier and a customer. There is a ...
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2answers
94 views

Is DDD not appropriate for my website or should I introduce a Query Layer?

I have inherited an ASP.NET website application and the previous developer has used what I believe are some DDD concepts. I am new to DDD and I have to admit I am struggling with the practical side of ...
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1answer
90 views

Fire domain events after transaction completes

I am trying to implement a domain event system that only fires its events when the associated unit-of-work commits successfully. The main reason why I want to do this is because I have other ...
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2answers
124 views

Limitations of the Identity Map pattern

After asking about the implementation in Ruby of the Identity Map pattern because the potential memory leak in long running server apps, I am considering my initial concept of that pattern. Initially ...
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3answers
121 views

Assigning responsibility for cancelling an Order

During a conversation with our Domain Expert we can across this feature: A Customer service agent can cancel an Order by decreasing its quantity. To cancel an Order we decrease its quantity by the ...
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36 views

Security in Transversal Layer in Domain Driven Design

I'm building a solution based on Domain Driven Design, I'm trying to implement the security system (authentication, authorization, roles, system configuration, connection strings, etc..) in a ...
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3answers
264 views

How do you make a service stateless?

When doing Domain Driven Design it is advised that services should be stateless. There are several kinds of services when doing DDD: Application services. Domain services. Infrastructure services. ...
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46 views

Extending database model of ORM in subproject

I have a maven project which contains some entities which are stored in a database. The purpose of this project is to manage personal information, users, locations, etc. This project can work on its ...
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2answers
100 views

How far can I drift from my original domain model and still have the benefits of an ORM?

I have the following domain models: public class User { public int Id { get; set; } public ICollection<Product> Products { get; set; } } public class Product { public int Id { ...
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2answers
79 views

Design of active or passive class domain [closed]

Sorry if my (simplified) example is too broad. Given this model (written in C#): class Ball { } Let's assume that a ball can be launched. To implement this feature, I can define something like: ...
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1answer
97 views

Domain-specific Interfaces

Are there any real benefits of using interfaces over abstract classes in a domain model? Does anyone have any experience using interfaces in a domain model in a real project? From a technical ...
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1answer
38 views

What are the boundaries of Domain Events?

As I get it, domain events imply loose coupling and separation of responsibilities. That's fine. But if domain events are allowed to cross aggregate's boundaries then it is a question how to guarantee ...
2
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2answers
89 views

Should I use the repository in the Domain Object or push the Domain Object back to the Service Layer?

I have come from a transaction script world and I am just starting to take a look at DDD. I am unsure of the correct way to integrate a DDD design with database persistence. This is what I have: A ...
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1answer
182 views

Onion Architecture Structure

I am looking to understand and implement the Onion Architecture and have a vague idea on how to structure everything but need help to clear up some of my confusion. Based on different examples and ...
2
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1answer
98 views

If the UI layer depends on the Application layer. Who starts the application/process?

This is related to DDD for a desktop application in c#...with 4 layers ui/application/domain/infrastructure. Actually 3 desktop applications sharing part of the domain and part of the infrastructure. ...
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2answers
110 views

How to work with large aggregate roots?

I'm learning DDD and yet I have more questions than answers. Let's consider a model of a directory containing enormous number of files. Here is how I see it: Directory is an Aggregate root. This ...
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2answers
154 views

Sanity check for design pattern used with an intricate calculation model

I am working on a project that generates technical brochures in batch. The 3rd party API that is being used expects POCOs with property names that match field names used in each of the brochure ...
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1answer
79 views

Should a domain object wrap/contain a DTO interface?

Using .NET - I have an interface IPerson. This interface is implemented by classes in multiple, separate repositories, e.g. EF6 (EfPerson), custom SQL (SqlPerson), or even custom assembly connecting ...
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6answers
370 views

Object Design & Cohesion - Issue & potential refactoring

Abstract I have been trying to get my head around the cohesiveness of some functionality in our code base. I’ve approached this design in different ways, and lately I’m convinced that I took the ...
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3answers
148 views

“Cross-cutting” domain in DDD

I've recently started studying Domain Driven Design and so far it looks like it will help tremendously with my team's current project. I'm running into a bit of a problem though actually determining ...
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2answers
276 views

Repository pattern implementation that knows nothing about the database table and column names

I've seen around the Internet and Github, implementations for the design pattern Repository that knows about database table and column names. I was think, if I want to work with the database as a ...
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45 views

Reporting Logic vs Domain Logic

Should the reporting logic to extract domain data in a certain format reside in domain objects or separate reporting objects? The reporting logic needs to: select entities/data which match selection ...
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1answer
168 views

What is a good practice to push notifications in a “near real-time” delay in this case?

I want to enable some real-time notifications about friend's activities (social network). Technical context is: Webapp calling backend (REST API's). Scenario is: Kevin follows Bob. When Bob ...
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1answer
70 views

DDD with entities with no relations

Disclaimer: I'm not 100% sure I understand some of the practices and concepts in DDD, so this question may actually be answered by clarification of the ideas I'm working in a legacy system (written ...
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2answers
172 views

Where to put format validation in a CQRS “stylish” domain model?

It feels right to put format validation inside the domain objects (VOs or entities) because it is the natural place for high cohesion and the domain knows best what every domain ...
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1answer
111 views

PHP - Repository matrix pattern?

I'm trying really hard to refactor some of my legacy code in the project using best practices and design patterns + DDD so I'd love some feedback on an issue I'm currently having. Let's assume that I ...
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1answer
155 views

Technical example of modeling a domain with OOD?

Considering favoring composition over inheritance and looking at various design patterns there are multiple approaches to modeling a domain. Say you have some Entities which are very similar in some ...
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45 views

What should a domain object's validation cover?

I'm trying to figure out how to do validation of domain objects that need external resources, such as data mappers/dao Firstly here's my code class User { const INVALID_ID = 1; const ...
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4answers
268 views

Circular dependency and object creation when attempting DDD

I have a domain where an Organization has People. Organization Entity public class Organization { private readonly List<Person> _people = new List<Person>(); public Person ...
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1answer
94 views

Do cross reference database tables have a place in domain driven design?

First some background. Let's say we have a system where a customer is placing an order in a web interface. The items that customer is ordering can priced in various ways. Sometimes including the cost ...
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94 views

Entities (DDD) when using CQRS on Akka

When using Akka, CQRS style, is still there a place for Entities? Or does everything now go to Aggregates, implemented as Actors + Value Objects. I notice that most entities are written as mutable ...
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1answer
183 views

How does a search functionality fit in DDD with CQRS?

In Vaughn Vernon's book Implementing domain driven design and the accompanying sample application I found that he implemented a CQRS approach to the iddd_collaboration bounded context. He presents ...
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1answer
177 views

Applying DDD to a simple app with a configuration twist

I’m using the light-weight PHP Fat-Free Framework as a base to form a simple MVC based app with DDD philosophy for the Model layer. I’m aware that DDD is most suitable or enterprise solutions and that ...
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1answer
133 views

Use a custom value object or a Guid as an entity identifier in a distributed system?

tl;dr I've been told that in domain-driven design, an identifier for an entity could be a custom value object, i.e. something other than Guid, string, int, etc. Can this really be advisable in a ...
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3answers
119 views

Do we tell the object to do something or do we do something (on/with/to/etc.) the object?

Take the (unprecedented and groundbreaking) example of the calculator: public class Calculator { public double Add(double augend, double addend) { return augend + addend; } } ...
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2answers
216 views

I'm not sure how to add common functionality to my business objects using DTOs/DDD? [closed]

I have created a couple of projects to create a better division of my code: I have a Portable Class Library targeting all frameworks that contains just basic DTOs (auto-generated against a database). ...
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1answer
165 views

From a DDD perspective is a report generating service a domain service or an infrastructure service?

Let assume we have the following service whose responsibility is to generate Excel reports: class ExcelReportService{ public String generateReport(String fileFormatFilePath, ResultSet data){ ...
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62 views

DDD: How to reconcile a BoundedContext with REST/WebService DTO's?

I'm just starting to learn about DDD, and I'm trying to understand how Bounded Contexts can be reconciled with client facing API's like REST/WebServices that use DTO's. For example: your system ...
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1answer
319 views

Domain Services vs. Factories vs. Aggregate Roots

After dealing with DDD for months now, I'm still confused about the general purposes of domain services, factories and aggregate roots in relation to each other, e.g. where they overlap in their ...
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2answers
622 views

What, in reference to DDD, is a bounded context?

When working through the book "Implementing Domain Driven Design" by Vaughn Vernon, I have been unable to gain a good grasp on what a bounded context actually is. The book defines a bounded context ...
5
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1answer
436 views

To Repository Or Not To Repository

When I first learnt about Domain Driven Design, I was also introduced to the repository and unit of work patterns that once seemed to be top notch for the cool kids that threw SQL queries like ...
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0answers
27 views

Domain security involving domain logic

Together with my application's domain logic I am trying to outline the security model. I am stuck with a requirement that prevents me from considering security just a cross-cutting concern over my ...
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1answer
116 views

Cascading deletes from an aggregate root through out the entire aggregate doesn't make sense

Based on the same example for this question. Within the Pro ASP.Net MVC 4 by Adam Freeman, there is a discussion on aggregates and aggregate roots with a simple auction system. There are members who ...
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1answer
65 views

DDD / Optimizing a specific service belonging to a specific bounded context regarding hardware

Well known is the split of a whole application into several bounded contexts to emerge an Ubiquitous language. while practicing Domain-Driven Design. In general, 1 bounded context = 1 archive file ...