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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A small project but I want to use design patterns to do it right

I've got a project coming up, a very a small system, but one that needs to be extended in the future. Here's how I've designed it so far. It's 3-tier: presentation, business and data. For the ...
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74 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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47 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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71 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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50 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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109 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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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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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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How to implement DDD in a distributed application with NHibernate?

I have an ASP.NET MVC web site working in this way: (In the controller) var user = _applicationService.GetUserById(1); user.ChangeEmail("mynemail@somewhere.com"); user.ChangeAddress("my new street", ...
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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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36 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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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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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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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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25 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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52 views

Event Sourcing for Enterprise Applications

Is it viable to store information a la event sourcing when dealing with large enterprise applications ? I know lokad has been using it for a long time, but they are not in the ERP business I have ...
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161 views

How Add/Create* commands should be handled in CQRS + Event Sourcing architecture

I want to implement my first application using CQRS pattern along with Event Sourcing. I am wondering how creation of aggregate roots should be handled properly. Let's say someone sends CreateItem ...
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72 views

Model Driven Design with Bean Validation

If I have a rich domain library that gets included into a Java web application, but I want to achieve a level of dependency isolation with that domain library such that it is possible to build and ...
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DDD (with MS's Silk Project) Where would a Parsing Class go?

I am working on a large scale project that involves a Web Application (done in ASP.NET MVC 4) and several Windows services (C#.NET 4.0). We followed the solution and project layout guidelines from the ...