![]() the fragment can have only one thread executing it at once. It seems that I cannot represent anything of what is happening. I thought first Sequence Diagrams since it includes loops and can represent-I think- threads of execution, but I am not sure what goes along the lifelines. 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. However I am unsure which (if any) UML diagram could be adequate to represent it. 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. Figure 2 depicts a sequence diagram for the detailed logic of a service to determine if an applicant is already a student at the university. 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. (2) When using 'alt', you have to mention. (1) Remember, that a class / object may send messages to itself ( 'DoSomething' ), this makes 'alternatives' more diificult to appreaciate. 2.How often is a conditional sequence used in UML sequence diagrams Every time there is the need to explain the choice between two or more message sequences. You can manually add activations at the start of each alt fragment and at the end of the activation send the return message. You can use the If else condition, also called alternatives in UML terms. Using Interaction Frames (Combined Fragment)Īnother way of presenting control logic is using fragments (a.k.a interaction frames) together with Interaction Operators. 1 Answer Sorted by: 2 1.Is there a standard way to show a conditional sequence Yes. 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. In the user authentication process we describe, the messages show how a user enters information into the browser to gain access to the webpage and how the web browser will then cross-check credential to the designated application.A common issue with sequence diagrams is how to show conditions and iterations. What information is passed from one object to another? ![]() The other set of components you must identify are the messages the objects will send. The objects, sometimes called actors, are the principal players that perform tasks and send messages.įor example, in a login sequence, two of the objects would be the potential visitor or user and the login page a visitor uses to interact with the platform they’re attempting to log into. The first necessary set of components are the objects. To accomplish these goals, you must first identify the components of your system that should be diagrammed. Map out a real or hypothetical scenario that has many different components. See how objects and components interact with each other in sequence to complete a process. Model how a complex procedure or system operates. From Wikipedia: The releases prior to version 4.23 are free software licensed under GPL. BOUML runs under Unix/Linux/Solaris, MacOS X (Power PC and Intel) and Windows. Otherwise you could model it via an Activity Diagram with send and receive actions describing the interactions between user and system. BOUML is a free UML 2 tool box (under development) allowing you to specify and generate code in C++, Java, Idl, Php and Python. You can accomplish several critical tasks with a sequence diagram. If you write the behavior of your use case as text, yes.
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