Using Duration Constraint in Sequence Diagram
In a sequence diagram, a duration message is used to indicate the passage of time of message. It's especially useful when you want to model a real-time system. With Visual Paradigm for UML (VP-UML) 8.0, you can add duration constraint to messages in one click. This tutorial will demonstrate this how to define duration constraint in sequence diagram.
| August 16, 2010 | |
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- Download Online Book Store.vpp from this tutorial in advance.
- Open the project with VP-UML.
- Let's take the following sequence diagram as an example:
- Assume you need to specify the time limit between Browse message and Book List message, you therefore, have to add duration constraint between them. Move the mouse over Browse message and press Duration Constraint button.
- Drag it from Browse message to Book List message and then release the mouse.
- Enter the constraint detail inside the caption. For example, it should take more than 3 seconds but less than 5 minutes. You can enter > 3s & < 5mins.
- The duration constraint between Browse message and Book List message is shown below:
- On the other hand, you can add duration constraint not only between two message, but also on the message itself. Let's try to add duration constraint on Query message. Move the mouse over Query message and click Duration Constraint button.
- Assume it should take less than 10 seconds. Enter < 10s inside the caption.
- The duration constraint for Query message is shown below:
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Comments (2)
written by John Finbraaten on October 1, 2010
You have minutes abbreviated as "ms", but this is usually the abbreviation for milli-seconds. Probably better to abbreviate minutes as "min".
written by Jick Yeung on October 7, 2010
Hi John,
Thank you for sharing your finding with us. The page has been updated. If you have any other comments, feel free to post again.
Best regards,
Jick