![]() ![]() 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. Besides, Visual Paradigm can generate sequence diagram from the. With the advanced visual modeling capability, you can create complex sequence diagram in few clicks. It shows how the objects interact with others in a particular scenario of a use case. 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. The Sequence Diagram models the collaboration of objects based on a time sequence. Move the mouse pointer over the Customer actor. The system will let users make a reservation, which is a use case of the system. Drag it onto the diagram to create an actor and name it Customer. Using Interaction Frames (Combined Fragment)Īnother way of presenting control logic is using fragments (a.k.a interaction frames) together with Interaction Operators. Enter System Use Cases as diagram name and click OK. For each of the line item in the order - if the item value > 10,000 then dispatch through careful Distributor, else dispatch through regular distributor. if/else -> (alt) condition, separated by horizontal dashed line. 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. This is a sequence diagram that shows the representation of selection and loop. 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. A common issue with sequence diagrams is how to show conditions and iterations.
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