Draw UML Communication Diagram
Communication diagram is a kind of UML diagram shows interactions between objects, parts or sub-system. Communication diagram provides similar detail as sequence diagram without time information. This tutorial, we are going to model the money-transfer operation of an online banking system with Visual Paradigm for UML, to see how objects communicate with each others.
| March 24, 2010 | |
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- Create a new project. Name it as Online Banking.
- In the Diagram Navigator, expand the node UML Diagrams, then right click on node Communication Diagram and select New Communication Diagram from the popup menu.
- Immediately name the diagram as Transfer Money (in the name box at top left corner). Click on the background of diagram to confirm the naming.
- Add swimlanes to model the partitioning of system. Select Swimlane from diagram toolbar and click on the diagram to create it. Name it as Client.
- Repeat the previous step to create another swimlane Main frame below swimlane Client.
- Start the story from the actor. Select Actor from the diagram toolbar. Click within the swimlane Client to create an actor, and name it as User.
- User will operate the system via the account page. To present this, we need to add a lifeline for Account Page, and link it up with the actor User. Move the mouse pointer over actor User, press on the resource icon Message -> LifeLine and drag to the right. Release the mouse button and name the lifeline as Account Page.
- We want to model the message pass from user to account page. Double click on the arrow marked 1, enter visit, then click on the background of diagram to confirm the change. Note that the number next to the message, 1 in this case, represent the order of message flow within the interaction being modeled.
- The account page will direct user's request of transferring money to the main frame for validation and execution. Again, move the mouse pointer over lifeline Account Page and make use of the resource centric interface to create lifeline Transaction in swimlane Main frame.
- Name message 2 as transfer (targetAccount, amount).
- The money transferral process involve withdrawing money from user's account, and depositing money to target account. But before these, we need to make sure user's account has enough money to undergoing the transferral. Make use of the resource centric-interface to create a lifeline User Account from lifeline Transaction. Name message 3 as hasBalance (amount) : boolean.
- Once the account balance is checked, we can withdraw money from user's account. To add the 4th message between lifeline Transaction and User Account, move the mouse pointer over the link between Transaction and User Account, click on the resource icon Create Message and name the message as withdraw (amount).
- Before we continue, expand the swimlane Main frame first. Select the header of swimlane Main frame, press on the resize handler at the bottom of swimlane and drag downwards.
- Create a lifeline Target Account from lifeline Transaction, using the resource-centric interface. Name the 5th message as credit (amount).
- The transaction is complete. Let's make the lifeline Transaction dispose itself. This time, move the mouse pointer over the lifeline Transaction, then click on the resource Self Message -> LifeLine.
- Name the 6th message as dispose().
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Finally, we shall display a message on screen, telling user that transaction is complete. Move themouse pointer over the link between lifeline Account Page and Transaction. Click on the resource icon Create Reverse Message. Name the 7th message as displayResult().
- Save the project by selecting File > Save Project. This is the end of the tutorial.
Finally, the diagram should look like this:
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