![]() ![]() the fragment can have only one thread executing it at once. ![]() Equivalent to an alt with only one trace.ĭefines that the calls within the fragment run in parallel.ĭefines that the calls within the fragment run in a loop.ĭefines that the calls within the fragment reside in a critical section, i.e. ĭefines condition to a single call - the call will execute only if the supplied condition is true. altĭivides fragment into groups and defines condition for each group - only the one whose condition is true will execute. The following table provides guidance on the most useful operators, and their corresponding descriptions. For instance, in order to define that a call will execute only if a certain condition is true – we delimit the call with a fragment and use the operator ‘Opt’ to specify the condition. Interaction Operators (shown below) are used to characterize the fragment. The latter calls can be partitioned to groups (combined fragment) to show according to which condition each group will execute. With fragments we can delimit set of calls to show that they 1) execute only if a given condition is true 2) execute in a loop 3) run in parallel 4) reside within a critical section 5)etc. It is a problem when the associated conditions or actions are big, the diagram becomes very large. For now, I use the if/elseif/else plantUML structure to draw them but the different cases are placed horizontally. Using Interaction Frames (Combined Fragment)Īnother way of presenting control logic is using fragments (a.k.a interaction frames) together with Interaction Operators. I'm working on some code with switch case structures on big enumerate type or if/elsif/else structures with big conditions. The sequence bellow shows CarsManager that iterate though collection of Cars and execute a wash on each Car, which in turn delegate to the appropriate strategy according to the requested technique. Indeed, the activity diagram is more appropriate to model control logic that involves conditions, loop etc, but in practice, most developers prefer to stick with the sequence diagram to show how objects interact together with the control logic involved.Ī simple way of presenting conditions and loops is using simple notes. ![]() And a brief history in tweets reminisces about the days of old.A common issue with sequence diagrams is how to show conditions and iterations. UMLet supports a variety of UML diagram types: class diagrams, use case diagrams, sequence diagrams, state diagrams, deployment diagrams, activity diagrams - see some examples.įinally, porting UMLet to a JavaScript web app, and later to a VS Code extension, is described These custom elements are outlined here or in this paper. Without leaving UMLet, users can thus create and add new element types to their diagrams. An element's look can be modified at run-time by changing a few lines of Java code UMLet then compiles the new element's code on the fly. The frame is labeled in the top-left corner. These frames are known as combined fragments in the UML specification and the container is known as the interaction operand. They represent conditional structures that affect the flow of messages. UMLet also allows users to create their own custom UML elements. A fragment in a sequence diagram is a rectangular frame drawn over part of the diagram. Elements can also be modified inside their palettes and immediately used as new templates this way, users can easily tailor UMLet to their modeling needs. Learning about the various element features is supported by prototypically using them from sample palettes. UML elements are modified using text input and a small markdown dialect instead of pop-up dialogs. UMLet is a UML tool aimed at providing a fast way of creating UML sketches. ![]()
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