#Staruml use case diagram arrow how to
#Staruml use case diagram arrow software
#Staruml use case diagram arrow code

For conditional logic, you can use an alt operator and put a condition on each fragment. (Table 4.1 lists common operators for interaction frames.) To show a loop, you use the loop operand with a single fragment and put the basis of the iteration in the guard. Each frame hasĪn operator and each fragment may have a guard. In general, frames consist of some region of a sequence diagram that is divided into one or more fragments. Figure 4.4 shows a simple algorithm based on the following pseudocode: Both loops and conditionals use interaction frames, which are ways of marking off a piece of a sequence diagram. Treat sequence diagrams as a visualization of how objects interact rather than

#Staruml use case diagram arrow code

If you want to show control structures like this, you are better off with anĪctivity diagram or indeed with code itself. This isn’t what sequence diagrams are good at.

#Staruml use case diagram arrow how to

However, in most scenarios, a single figure is not sufficient in describing the behavior of a system and both figures are required.UML Distilled: A Brief Guide to the Standard Object Modeling Language, 3rd EditionĪ common issue with sequence diagrams is how to show looping and conditional behavior. Sequence diagrams, on the other hand, focus on the order of messages that flow between objects. Collaboration diagrams are used to visualize the structural organization of objects and their interactions. While both types use similar information, they display them in separate ways. In UML, the two types of interaction diagrams are collaboration and sequence diagrams. Additionally, collaboration diagrams typically exclude descriptive information, such as timing. As the number of objects and messages grows, a collaboration diagram can become difficult to read and use efficiently. However, collaboration diagrams are best suited to the portrayal of simple interactions among relatively small numbers of objects. Visualizing the complex logic behind an operation.Capturing the passage of information between objects.Demonstrating forward and reverse engineering.Exhibiting many alternative scenarios for the same use case.Providing an overview of collaborating objects within an object-oriented system.Modeling collaborations, mechanisms or the structural organization within a system design.A few examples of instances where collaboration diagrams might be helpful include:

Components of a collaboration diagramĬollaboration diagrams should be used when the relationships among objects are crucial to display.

After all objects are placed, links and messages should be added in between. The most important objects are placed in the center of the diagram, with all other participating objects branching off. These messages are communications between objects that convey information about the activity and can include the sequence number. messages- Messages between objects are shown as a labeled arrow placed near a link.Each link is an instance where messages can be sent. Links- Links connect objects with actors and are depicted using a solid line between two elements.Each actor has a name and a role, with one actor initiating the entire use case. Actors- Actors are instances that invoke the interaction in the diagram.If an object has a property or state that specifically influences the collaboration, this should also be noted. The naming label follows the convention of object name: class name. Objects- Objects are shown as rectangles with naming labels inside.The four major components of a collaboration diagram are: Notations of a collaboration diagramĪ collaboration diagram resembles a flowchart that portrays the roles, functionality and behavior of individual objects as well as the overall operation of the system in real time.

#Staruml use case diagram arrow software

Several vendors offer software for creating and editing collaboration diagrams. A model is then built using the relationships between those elements. These diagrams can be used to portray the dynamic behavior of a particular use case and define the role of each object.Ĭollaboration diagrams are created by first identifying the structural elements required to carry out the functionality of an interaction. A collaboration diagram, also known as a communication diagram, is an illustration of the relationships and interactions among software objects in the Unified Modeling Language ( UML).