Domain-Driven Design: Tacking Complexity In the Heart of Software Guide books ACM Digital Library
Table Of Content
Lifting this ceiling on complexity calls for a more serious approach to the design of domain logic. Early in my career, I was fortunate to end up on a project that did emphasize domain design. This project, in a domain at least as complex as the one above, also started with a modest initial success, delivering a simple application for institutional traders.
Building Blocks
One project I joined started with lofty aspirations to build a global enterprise system based on a domain model, but finally had a disappointing result. The team had good tools, a good understanding of the business and gave serious attention to modeling. But a separation of developer roles led to a disconnect between the model and implementation, so the design did not reflect the deep analysis that was going on. In any case, the design of detailed business objects was not rigorous enough to support combining them in elaborate applications.
References to this book
The team members will share a language that enriches their communication and keeps it connected to the software. They will produce an implementation in step with the model, giving leverage to application development. They will share a map of how design work of different teams relates, and will systematically focus attention on the most features most distinctive and valuable to the organization. The XP process assumes that you can improve a design by refactoring, and that you will do this often and rapidly. What is needed is an approach to domain modeling and design that pulls its weight. In addition to this core readership, the book will be of interest to analysts and to relatively technical project managers.
Common terms and phrases
To make the discussion concrete, I will use XP throughout the book as the basis for discussion of the interaction of design and process. “His book is very compatible with XP.It is not about drawing pictures of a domain; it is about how youthink of it, the language you use to talk about it, and how youorganize your software to reflect your improving understanding ofit. Eric thinks that learning about your problem domain is aslikely to happen at the end of your project as at the beginning,and so refactoring is a big part of his technique. "The book is a fun read. Eric has lots of interesting stories, and he has a way with words. I see this book as essential reading for software developers--it is a future classic."
When I took a close look, I saw that they lacked a domain model, or even a common language on the project, and were saddled with an unstructured design. So when the project leaders did not agree with my assessment, I declined the job. A year later, they found themselves bogged down and unable to deliver a second version. Although their use of technology was not exemplary, it was the business logic that overcame them. Their first release had ossified prematurely into a high-maintenance legacy. As aresult of this initial success, expectations for future development were sky-high.
Skill level: Intermediate
They have suffered "analysis paralysis", so afraid of an imperfect design that they made no progress at all. Readers of various backgrounds may wish to take different paths through the book, shifting emphasis to different points. I recommend all readers to start with the introduction to Part I, and Chapter 1. This book is a narrative, and can be read beginning to end, or from the beginning of any chapter.
Analysts can draw on the connection between model and design to make more effective contributions in the context of an 'Agile' project. Analysts may also use some of the principles of strategic design to better focus and organize their work. Analysts can draw on the connection between model and design to make more effective contributions in the context of an "Agile" project. I watched one project get out of the gate fast with a useful, simple web-based trading system. Developers were flying by the seat of their pants, but simple software can be written with little attention to design. As a result of this initial success, expectations for future development were sky-high.
Chris Richardson on Domain-Driven Microservices Design - InfoQ.com
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Most members of a software project team can benefit from some parts of it. It will make most sense to people who are on a project, trying to do some of these things as they go through, or who have deep experience already to relate it to.Some knowledge of object-oriented modeling is necessary to benefit from this book. The examples include UML diagrams and Java code, so the ability to read those languages at a basic level is important, but it is unnecessary to have mastered the details of either UML or Java. Knowledge of Extreme Programming will add perspective to the discussions of development process, but the discussion should be understandable without background knowledge. I have spent the past decade focused on developing complex systems in several business and technical domains.
Although it has never been clearly formulated, a philosophy has developed as an undercurrent in the object community, which I call "domain-driven design". Should you use Domain-Driven Design within your software development life cycle? If you have a domain expert on the team and want a design that promotes communication and flexibility on a project that isn't overly technical, Domain-Driven Design would be a great option for you!
But this delivery was followed up with successive accelerations of development. Each successive iteration opened exciting new options for integration and elaboration of functionality. The team way able to respond to the needs of the traders with flexibility and expanding capability. This upward trajectory was directly attributable to an incisive domain model, repeatedly refined and expressed in code. The quality of communication improved among developers and between developers and domain experts, and the design, far from imposing an ever-heavier maintenance burden, became easier to modify and extend.
In recent years there has been a rebellion against elaborate development methodologies that burden projects with useless, static documents and obsessive upfront planning and design. Instead, the Agile Processes, such as XP, emphasize the ability to cope with change and uncertainty. This has been a much-needed antidote to some of the excesses of design enthusiasts. Projects have bogged down in cumbersome documents that provided little value. They have suffered 'analysis paralysis', so afraid of an imperfect design that they made no progress at all.
The Greatest Computer Books of All Time - Technologizer
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This book is not specific to a particular methodology, but it is oriented toward the new family of "Agile Development Processes". In other words, during application development, the domain is the "sphere of knowledge and activity around which the application logic revolves." Some of these design factors are technological, and a great deal of effort has gone into the design of networks, databases, and other technical dimension of software. “Eric Evans has written a fantasticbook on how you can make the design of your software match yourmental model of the problem domain you are addressing. Domain-driven design also heavily emphasizes the ever-more-popular practice of continuous integration, which asks the entire development team to use one shared code repository and push commits to it daily (if not multiple times a day). Part III delves into modeling principles that can guide choices along the way, and techniques that help direct the search.
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