Now, when you talk about your work with engineers and also with the people who engaged you to design the building, the term “Residential Building” is more meaningful for everybody concerned. So, we may narrow down our domain to “Residential Building”. So, a general term “Building” can make us miss few details. The building you are going to design must have design for apartments where people will live. But note that, if you consider Building as your domain you may miss few granular details for your requirement. Let’s say you are engaged to design a building. But again, we will go through the technical terms of DDD too! This example may not be related with application development but as the goal is to tune our thinking top to bottom manner, it will be useful.
#Domain driven design quickly how to#
In this article I would like to go through a real world example to give you the feeling how to start analyzing your project driven by your domain. The subject area to which the user applies a program is the domain of the software.ĭo you get a feeling what is domain from this definition? Can you tell what is the domain of the project you are working on at this moment? Can you tell what is the domain of the famous website YouTube? Understanding the DomainA sphere of knowledge, influence, or activity. The toughest part is to tune your thinking process! Because I believe if you understand the concept and starts thinking in DDD way, implementation is easy. In this article I will try to avoid becoming too technical, rather I will try to go through different concepts of DDD being close to the real world.
#Domain driven design quickly software#
DDD provides a structure of practices and terminology for making design decisions that focus and accelerate software projects dealing with complicated domains. What is DDD?Domain-driven design is not a technology or a methodology. The solution is DDD (DOMAIN DRIVEN DESIGN). So, is traditional approach – “Designing the application starting from database” a throw away concept? Not really! But if you have a complex application to develop, this bottom-up design approach does not dictate you to come up with a proper object oriented design. And so, developers know only the portions they worked. Cause, the design of the application does not represent the domain of the system. Have you ever heard that a developer of your team is talking like he does not have the domain knowledge of the whole application? Perhaps yes! I think you can understand the reason. See, when you design a system you need to know what as a whole the application will do? What is the goal the client is trying to achieve? Then, from the top level goal you come up with different smaller functionalities that will eventually allow the users to achieve the top level goal.īut when you design in bottom-up approach, you first design for the granular functionalities, and you have little or no knowledge how this functionality will be used from the Top level and how the Top level functionalities will actually look like. Rather it tempted us to design the system in Bottom-Up fashion. But do you know why? The reason is, traditional approach do not guide us designing the system in Up to Bottom fashion. I am sure you have been facing these issues regularly. Looking at your objects it is not possible to understand what actually the whole application is all about.You have no or very poor relationship among related items.You have objects that have properties that are not actually attributes of that object.You have more than one object for the same item.Your project has the same functionality implemented in the same way or different in different places.Did you ever face any of the issues below? Think about all of the projects you have worked last few years in the traditional approach. But NO! We are not doing good in maintaining and extending our projects! The answer is YES and NO! Yes we are doing good in delivering our projects. So? What’s wrong with this approach? We have been doing good! Don’t we? We design the database schema - sometimes by the team leader or sometimes by the respective developer. We distribute the works among team members. In most of the cases the goal of the breakdown is to come up with an estimation and plan of works. What we traditionally do when we start a business application? We read the spec and find the functionalities.
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