Specially important is that the two components (User and Blog, in mid-blue colour) are decoupled. So I came up with an idea for a new documentation diagram, which I call an Application Map, that can replace the C4 Model Component diagram. One thing, that gets me a little bit confused that how I am going to aggregate all these APIs together (will there be a single controller or separate)? Yes, i do, but there must always be some way of detecting what types of code we have. I find it specially important that all the options under consideration be written down with their pros and cons, as to spark discussion and a clear decision. So, in the diagram below we can see, for example, that the Infrastructure layer, being one of the top outer layers, can depend on any other layer. Learn More. You can find the configuration used to generate them in the repository root. I use SharedCore to name my business Shared Kernel namespace, and Domain.Core to name my business domain core interactions (the most inner layer of the architecture, that has no dependencies except the SharedCore. The idea is to use 4 different granularity (or zoom) levels for documenting software architecture: This is the highest granularity diagram. I like to use event/event handler when I do things that are not strictly related to the original handler or that can be done asynchronously (like sending email/notification) or when different commands have the same consequences. Basic Idea is to keep business logic isolated from the Input/Output and external libraries However, it still doesn’t tell us how all these capabilities relate to each other, for example “what happens as a consequence of a user creating a blog post?”. But, when used in a big application, this diagram will still have problems common to the previously mentioned diagrams: To solve the first problem, we need to be able to generate the diagram from the code, on-demand. As i see it, you are going in the right direction by grouping them into packages, but i go even further. It will quickly lose value if it’s too detailed (comprehensive). The separation between events and listeners in two different namespaces is because a component might triger an event but not listen to it, and it might listen to an event that it does not trigger, so they are somewhat independent, although I think it would be fine to put them together as well. To know more about it, you can read Simon Brown’s own explanations about it here and here, or even watch him talk about it here. Level 3: Component diagram 4. It reminds me this post by simon brown http://www.codingthearchitecture.com/2015/03/08/package_by_component_and_architecturally_aligned_testing.html. The colours represent different layers in the application, in accordance with the layers I wrote about in previous blog posts: The intention of this diagram is to visualize and make sure that the code in each layer can only depend on the layers inner or below it. It is also concise and readable, and because it’s small, it’s also fast to create. ( Log Out /  An example of good usage of an UML class diagram is to document design patterns: This is fine, this is actually great! So, make your team more aware. They’re key to the architecture. Core.Component.Domain.Entity.AnEntity.class. SomeUseCase.SomeHandler.class Based on the authors' extensive experience, Documenting Software Architectures helps you decide what information to document, and then, with guidelines and examples (in various notations, including UML), shows you how to express an architecture in a form that everyone can understand. This can help us clarify our code, and our idea of the application behaviour. But like everything in software architecture, it have its tradeoff. The use of a consistent, color-coded taxonomy is also a very helpful take-away from Juval’s course. In the case of a simple blog application, we could have two components, the “User” and the “Blog” components: In each of those components, we define what are the commands that can be issued to them. On the other hand, a “Billing” module is a component because it deals with domain concerns. It’s important to note that the 4+1 architectural view-model does not mandate that we use all mentioned diagrams, and not even all the views. Highly recommend taking Juval Lowy’s Architect’s Master Class, it teaches how to correctly decompose a system based on volatility and how to document it. This content is no longer being updated or maintained. Noté /5. No human will understand such a map generated for a mid-to-large sized system. 6 Documenting a Software Architecture 6.1 Introduction Architecture documentation is often a thorny issue in IT projects. This report compares the Software Engineering Institute's Views and Beyond approach for documenting software architectures with the documentation philosophy embodied in agile software-development methods. development of complex real-time systems. The content is provided “as is.” Given the rapid evolution of technology, some content, steps, or illustrations may have changed. The command and handler files go together because they are work and change together so I apply the Package Cohesion Principles by Robert C. Martin: They don’t quite help us see what is wrong in our application codebase, in regards to promiscuous code relations and poor structure, which impacts modularity and encapsulation, essential to any engineering product; They don’t help us understand our codebase as a whole, what the application cog wheels can do and how they interact with each other. The full article is provided "as is" in a PDF file. They are specially important because they intend to tell others, and our future selves, why the architecture is what it is. 1, What software architecture is, and why it's important to document Crucially important here is that these diagrams be automatically generated directly from the code, otherwise the diagram will reflect only what we think the code looks like, and if that was accurate we wouldn’t really have much need this type documentation. Any technical or non-technical person can clearly visualise what happens when any of the use cases of the application is triggered. At this point, we have all the components and their capabilities in the map. The 4+1 Architectural view model was created by Philippe Kruchten and published, back in 1995, in his paper titled “Architectural Blueprints—The “4+1” View Model of Software Architecture“. In a way, architecture documents are third derivative from the code (design document being second derivative, and code documents being first). Great article. What you are calling domain, I call Core, and what you call subdomain I call Component, but this is how I do it: Core.Component.Application.Command. I’ll quickly explain the main idea in my own words, although using his own example diagrams. Yes, I feel exactly the same pain as you. So, while an ORM is a module of the application, it is not a component because it only deals with technical concerns. In this new series, learn why and how you should document software architecture. Ideally, the namespaces/folder structure should communicate that on its own. Core.Component.Application.Command. Level 1: System Context diagram 2. Yes I must admit that I could improve the packaging to a more feature/component based style. Do you think it can apply to any codebase written in different styles? Although they are pretty good for the other diagrams. Lisez « Documenting Software Architectures Views and Beyond » de Paul Clements disponible chez Rakuten Kobo. So this diagram shows us the main cog wheels of a container and the relations between those cog wheels. This article is very helpful to understand Hexagonal architecture as well, but still I am not able to make it link with my requirement. Retrouvez Documenting Software Architectures: Views and Beyond (2nd Edition) 2nd edition by Clements, Paul, Bachmann, Felix, Bass, Len, Garlan, David, I (2010) Hardcover et des millions de livres en stock sur Amazon.fr. Do you consider using Archimate as a graphic notation for your application map? Documenting architecture is an important part of software development. In this new series, learn why and Architecture documentation (also known as software architecture description) is a special type of design document. ( Log Out /  Now I’m thinking about allowing the event handlers to have access to services/repositories/entities like the command handler. It would try to be a pure function and leave details like saving the post somewhere to other modules. Some time ago I started creating it, and I got to the point where only the component internal flow is missing, but it lists all the commands, services, listeners, subscribers and events. static.content.url=http://www.ibm.com/developerworks/js/artrating/, ArticleTitle=Documenting software architecture, Part 1: What software architecture is, and why it's important to document it. Documenting software architecture, Part 3, Develop the architecture overview. Core.Component.Application.Listener.WhateverListener.class The Application Map is aimed at being truly a map of the application, defining its “cities” (Components), its “local roads” (use cases), “highways” (events), etc. Components can be mapped to DDD bounded contexts and/or Microservices, which means they must be completely decoupled, physically and temporally, from other components. Maybe we just need an application map per command. email, sms, …). Furthermore, maybe more important than the diagrams themselves is the ability to use these dependencies analysis to stop a build in the case of a break in our predefined dependency rules. IBM and Red Hat — the next chapter of open innovation. Software architecture has become a widely accepted conceptual basis for the development of nontrivial software in all application areas and by organizations of all sizes. Level 4: Code diagram
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