2/26/2023 0 Comments Staruml sequence diagram loopIf you open this sequence diagram in Rational® Rose and then press the F5 key, Rose automatically generates the collaboration diagram shown in Figure 2. Figure 1: A sequence diagram is ideal for showing the time-ordering of messages during an object interaction. This particular sequence, shown in Figure 1, documents the interaction that occurs between business objects when determining how many items a borrower can check out of the library. This sequence diagram is one of the design documents created for a research and development library. To demonstrate this close relationship, this article will take a sequence diagram from the previous article in this series and show how it translates into a collaboration diagram. In fact, collaboration diagrams are so closely related to sequence diagrams, that some modeling tools, such as Rational Rose, can automatically create one type of diagram from the other. In reality, sequence diagrams and collaboration diagrams show the same information, but just present it differently. From Sequence Diagram to Collaboration Diagram Once you put your classes into action (or interaction), you can often see flaws in your static model that may not have been discovered otherwise. Some developers take the step of creating static models of their business objects, but don't "prove" their models by creating associated dynamic models. In addition, collaboration diagrams can also help you determine the accuracy of your static model (i.e., class diagrams). This is difficult to determine from a sequence diagram. So, why would you use collaboration diagrams?įirst of all, they are very useful for visualizing the relationship between objects collaborating to perform a particular task. Of the two types of interaction diagrams, sequence diagrams seem to be used far more than collaboration diagrams. In contrast, collaboration diagrams focus on the relationships between the collaborating objects. Collectively, both of these are known as interaction diagrams.Īlthough they both describe object interaction, sequence diagrams focus on showing the order in which messages are sent between objects. There are two diagrams in the Unified Modeling Language (UML) that help to document and describe this interaction?sequence diagrams and collaboration diagrams. Often, business objects need to call on the services of other business objects to accomplish a particular task. Collaboration diagrams allow you to see both the dynamic aspects and static relationships of business objects in a single diagram. As the user interacts with the software, business objects respond by carrying out requested actions such as performing calculations, retrieving, validating and manipulating data. UML collaboration diagrams are great tools for documenting the flow of messages between objects while providing a unique perspective?a view of the relationships between collaborating objects.Īt the very heart of any complex software application are business objects. This will remove the fill color from the note, revealing the drawing underneath.In well-designed software systems, powerful business objects work together to accomplish a variety of tasks. Make the note transparent by right clicking on it and selecting Format -> unchecking Use Fill Color.Draw a note over the message and add a description (for example, "Messages 2 through 4 are repeated.").Draw a message from one object to the other.Place two objects on the sequence diagram.It is desirable to arrange a diagram so that the arrows in the iteration can be enclosed together easily." ( OMG Unified Modeling Language Specification, 3.63.3 Presentation options)Īn arbitrary enclosure or bounding box can be created in a Rose diagram using a transparent Note element.īelow are the steps on how to represent a loop: If there is concurrency, then some arrows in the diagram may be part of the iteration and others may be single execution. For a procedure, the continuation condition for the iteration may be specified at the bottom of the iteration. For a generic sequence diagram, the iteration indicates that the dispatch of a set of stimuli can occur multiple times. "A connected set of arrows may be enclosed and marked as an iteration. For a set of messages which may be repeated multiple times, the UML 1.4 specification reports:
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