![]() See Figure 15.8.įigure 15.8 Two ways to show a return result from a message. Line is normally labelled with an arbitrary description of the returning value. I prefer the first approach when sketching, as it's less effort. Using a reply (or return) message line at the end of an activation bar.īoth are common in practice. Using the message syntax returnVar = message(parameter). There are two ways to show the return result from a message: The bar is optional.ĭrawing the bar is more common (and often automatic) when using a UML CASE tool, and less common when wall sketching. Stack) using an execution specification bar (previously called an activation bar or simply an activation in UML 1). Without the ball, intending by convention it is a found message.įocus of Control and Execution Specification BarsĪs illustrated in Figure 15.7, sequence diagrams may also show the focus of control (informally, in a regular blocking call, the operation is on the call However, by convention a team or tool may ignore showing this, and instead use a regular message line In the example of Figure 15.7 the starting message is called a found message in the UML, shown with an opening solid ball it implies the sender will not be specified, is not known, or that the message is comingįrom a random source. The time ordering is organized from top to bottom of lifelines.įigure 15.7 Messages and focus of control with execution specification bar. Solid line between the vertical lifelines (see Figure 15.7). Each (typical synchronous) message between objects is represented with a message expression on a filled-arrowed Place the condition for exiting the loop at the bottom left corner in square brackets. When that object's lifeline ends, you can place an X at the end of its lifeline to denote a destruction occurrence.Ī repetition or loop within a sequence diagram is depicted as a rectangle. ![]() Objects can be terminated early using an arrow labeled ">" that points to an X. Lifelines are vertical dashed lines that indicate the object's presence over time. Asynchronous messages are sent from an object that will not wait for a response from the receiver before continuing its tasks. Use half-arrowed lines to represent asynchronous messages. Messages are arrows that represent communication between objects. When an object is busy executing a process or waiting for a reply message, use a thin gray rectangle placed vertically on its lifeline. ![]() Use the UML object symbol to illustrate class roles, but don't list object attributes.Īctivation boxes represent the time an object needs to complete a task. Search through SmartDraw's knowledge base, view frequently asked questions, or contact our support team.Ĭlass roles describe the way an object will behave in context. Read articles about best practices, find tips on collaborating, learn to give better presentations and more. The SmartDraw API allows you to skip the drawing process and generate diagrams from data automatically.Īdd data to shapes, import data, export manifests, and create data rules to change dashboards that update.Ĭheck out useful features that will make your life easier. Learn how to generate visuals like org charts and class diagrams from data.īrowse built-in data visualizers and see how you can build your own custom visualization. Learn how to combine free-form brainstorming with diagram blueprints all while collaborating with your team. Learn about all the types of diagrams you can create with SmartDraw. Get inspired by browsing examples and templates available in SmartDraw. Familiarize yourself with the UI, choosing templates, managing documents, and more. Learn how to make any type of visual with SmartDraw.
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