July 2003
Beginner
256 pages
6h 28m
English
Content preview from Learning UMLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Nodes
A node is a resource that is available during execution time. (Nodes were mentioned in Chapter 2.) Traditionally, nodes refer to computers on a network, but in the UML a node may be a computer, printer, server, Internet, or any other kind of resource available to components. For example, the project management system may be deployed on the following nodes:
- A desktop client
On which the user interface component executes
- A printer
Which the project management system uses to print reports
- A business-processing server
On which the business-processing component executes
- A database server
On which the data component executes and where project-related information is stored
Nodes follow the type-instance dichotomy first discussed in Chapter 2 and applied to classes and objects in Chapter 3. You can use the UML to talk about classes of nodes, as well as specific nodes of a class. When speaking of a class of nodes, it’s customary to use the terms node or node class. Thus, while you might think of a node as a specific thing, in the UML, a node really represents a class of nodes. When speaking of a specific component of a class, use the term node instance.
A node is available during execution time and is a resource on which components may execute. In the UML, a node is shown as a three-dimensional rectangle labeled with the node’s name.
Figure 5-3 shows various nodes associated with the project management system, including a desktop client, business-processing server, database server, and ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.