Modeling with PlantUML
Instead of using drag-and-drop tools that can be tedious to update, we use PlantUML. PlantUML is an open-source tool that allows users to create UML diagrams from a plain text language.
Why Text-Based Modeling?
- Version Control: Since it’s text, you can track changes using Git.
- Speed: Quickly iterate on designs without fighting with mouse alignments.
- Consistency: The tool handles the layout automatically.
Basic Syntax Structure
Most diagrams start with a keyword defining the type (though often omitted in the specific component syntax we use here) and use simple arrows to define relationships.
Common Symbols
| Symbol | Meaning |
|---|---|
-> | Solid line/arrow |
--> | Dashed line/arrow |
: | Adds text to a line/relationship |
as | Alias for a long name |
[ ] | Represents a component or node |
( ) | Represents a use case |
Tips for Efficient Modeling
- Focus on Semantics: Let PlantUML handle the layout. Don’t spend too much time trying to force specific positioning unless necessary.
- Use Aliases: For long component names, use
asto keep your code clean.participant "Very Long Service Name" as Service User -> Service: Request - Colors and Styling: You can add skinparams or inline colors, but keep it simple for technical documentation.
node "Server" #LightBlue
Live Preview
In most modern IDEs (like VS Code), you can install the PlantUML extension to see a live preview of your diagrams as you type.