Winner: Drawįor ER diagrams, again syntax is similar, but Mermaid renders the images slightly better. Winner: Mermaid.įor Sequence diagrams, both syntax is similar, and the rendered image is also similar. In terms of setup, Mermaid is the simplest as you don't need to set up any external applications or servers. Overall, both tools do an excellent job, although in some cases one will shine over the other. There are a few out there, but this is the best one: Note: This article assumes VS Code is your editor of choiceįirst up, you'll need the PlantUML extension. So, which one is best? Let's take a look! Setup Mermaid is a JavaScript based engine and is the new kid on the block. PlantUML is a Java based engine has been around for a long time and is battle tested. Two popular choices for this are PlantUML and Mermaid. The added advantage is you can source control your diagrams and audit changes overtime. In this way you describe the diagram with code and the tooling takes care of the visual rendering. These generic tools do allow a lot of flexibility but end up costing you more time than you intended to align all boxes and arrows and to get the colour schemes just right.Īn approach gaining in popularity is to use tooling that allows 'diagrams-as-code'. There are many generic diagramming tools that can be used to design software such as (formerly draw.io), Miro, or Lucid Charts. A software implementation on the other hand, is not. Note: All generator outputs will be generated into the src-gen folder.Before jumping into any complex software development, it's often a good idea to spend some time designing the system or feature you will be working on. For instance, they can be integrated into Markdown and pandoc nicely. puml files, you can of course not only view them in Eclipse or VS Code but also process them further. A documentation how to call the generators can also be found here. The generators can be called from the context menus of the CML editors in VS Code or Eclipse. In case your CML model contains such user requirements, the PlantUML generator will also automatically generate a use case diagram for you. You can find the documentation about how to write such user requirements here. ![]() Note: If you you use the end state markers (*) as documented here, we also generate the corresponding end state transitions in PlantUML:ĬML also allows you to write Use Cases and User Stories. An example from one of our models ( Lakeside Mutual) If your model contains such state transitions, the generator will also create state diagrams for your aggregates or flows. ![]() Your CML models can define the lifecycle of Aggregates either in the Aggregate itself or inside application flow definitions. An example from the insurance scenario is: The generator also creates class diagrams for every bounded context and subdomain. For example, the component diagram for our insurance scenario (example model) looks like this: The generator creates a component diagram for your Context Map, showing the Bounded Contexts and its relationships. ![]() In addition to that, it generates state diagrams to visualize your Aggregate’s lifecycles (in case you modelled the state transitions). The component diagram illustrates all Bounded Contexts and their relationships, while the class diagrams show the domain models of the Bounded Contexts and Subdomains (if you used the Tactic DDD Syntax to specify them). We offer a transformation from our DSL into a graphical representation of the system this way. If the implemented Subdomains contain Entities, the generator produces class diagrams for these Subdomains as well. You can generate UML component diagrams representing entire Context Maps, UML class diagrams for each Bounded Context in your model, and UML state diagrams to visualize an Aggregates lifecycle. The PlantUML tool lets you create UML diagrams quickly.
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