![]() ![]() Mermaid.js is available in a variety of tools, but I most frequently use it in GitHub markdown files and in Polyglot Notebooks. It also means that the diagram source is easily version-controlled and anyone on your team can modify it without special tooling or licenses. This means your time is focused on actually writing the interaction logic instead of generating a visual. With Mermaid.js you can write a few lines of text and use its JavaScript library to generate a professional sequence diagram like the one below: Mermaid.js is the solution I needed 20 years ago. I distinctly remember working on sequence diagrams in my undergraduate computer science education and having so many issues trying to get the various boxes and arrows to look standard, rearrange shapes as I needed to expand the diagram, and generally focusing on anything but the logic the diagrams intended to create. Previously I've shown how Mermaid.js allows you to create entity relationship diagrams and class diagrams, but in this article we'll cover a far more complex diagram: the sequence diagram. You can use an Interaction element to insert an Interaction diagram as a child of a Class element.I've been really enjoying seeing how Mermaid.js lets you generate technical diagrams from simple markdown. The State/Continuation element serves two different purposes for Sequence diagrams, as State Invariants and Continuations. This example Sequence diagram demonstrates several different elements.Īn Actor is a user of the system user can mean a human user, a machine, or even another system or subsystem in the model.Ī Lifeline represents a distinct connectable element and is an individual participant in an interaction.īoundary elements are used in analysis to capture user interactions, screen flows and element interactions.Ī Control organizes and schedules other activities and elements.Īn Entity is a stereotyped Object that models a store or persistence mechanism that captures the information or knowledge in a system.Ī Fragment element can represents iterations or alternative processes in a Sequence diagram.Īn Endpoint is used in Interaction diagrams to reflect a lost or found Message in sequence.Ī Diagram Gate is a simple graphical way to indicate the point at which messages can be transmitted into and out of interaction fragments. ![]() You generate Sequence diagram elements and connectors from the 'Interaction' pages of the Toolbox. To toggle the numbering of messages on a Sequence diagram, select or deselect the 'Show Sequence Numbering' checkbox on the 'Preferences' dialog. Each element has a dashed stem called a Lifeline, where that element exists and potentially takes part in the interactions.Stereotyped elements, such as Boundary, Control and Entity, can be used to illustrate screens, controllers and database items, respectively.An Actor element can be used to represent the user initiating the flow of events.Messages on a Sequence diagram can be of several types the Messages can also be configured to reflect the operations and properties of the source and target elements (see the Notes in the Message Help topic).Sequence elements are arranged in a horizontal sequence, with Messages passing back and forward between elements. ![]()
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