Applying Domain-Driven Design and Patterns: With Examples in by Jimmy Nilsson

By Jimmy Nilsson

Making use of Domain-Driven layout and styles is the 1st entire, useful advisor to leveraging styles, domain-driven layout, and test-driven improvement in .NET environments. Drawing on seminal paintings by means of Martin Fowler and Eric Evans, Jimmy Nilsson exhibits the right way to customise real-world architectures for any .NET program. you are going to the best way to arrange area versions for program infrastructure; help enterprise principles; offer endurance aid; plan for the presentation layer and UI trying out; and layout for provider orientation or point orientation. Nilsson illuminates each one precept with transparent, well-annotated code examples in accordance with C# 2.0, .NET 2.0, and SQL Server 2005. His examples may be beneficial either to C# builders and people operating with different .NET languages and databases -- or maybe with different structures, reminiscent of J2EE.

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Extra info for Applying Domain-Driven Design and Patterns: With Examples in C# and .NET

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Each Order instance has a list of OrderLine instances. It looks something like Figure 1-2. Figure 1-2. UML diagram for Customer/Order example Moreover, let's assume that the model is very important to you and you don't care very much about how the data is fetched from and stored to the relational database that is being used. Here, a possible (yet naïve) schema would be to let each class ( Customer , Order and OrderLine) be responsible for persisting/depersisting itself. That could be done by adding a Layer Supertype [Fowler PoEAA] class (called PersistentObject in the example shown in Figure 1-3) which implements, for example, GetById() and from which the Domain Model classes inherit (see Figure 1-3).

Core business lasts. And when the core business changes, we want to change the model and the software. It's not rocket science so far, and I'm probably just kicking in open doors. I think, however, this lies at the very core of how to achieve efficient software development, and in my experience it is rarely used. By this I mean focusing on the model, having a model (with different presentations) that is used by both users and developers, and not getting distracted by unimportant details. Why Model Focus?

Why Model Focus? I'd like to exaggerate this a bit. Let's play a game: What kind of developer would be the best one for building a vertical system in a special field, let's say in finance? It goes without saying that developer should be technically savvy, very skilled and experienced, have a huge social network, and so on. It would also be very nice if he was extremely skilled in the business domain itself and it wouldn't hurt if he had worked as, say, a trader for ten years, if that's the kind of system to be built.

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