Figure 7-5 Transfer funds sequence diagram in Java

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Figure 7-5 Transfer funds sequence diagram
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The interactions between the actor and the system are shown as arrows, with the direction of the arrow indicating the direction of interaction Specifi cally, a request from the actor to the system is shown as an arrow from the lifeline of the actor to the lifeline of the system, with the arrow pointing to the system life line A response from the system to the actor is shown with an arrow drawn from the system lifeline to the actor lifeline and points to the actor
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The first arrow labeled "select accounts" routes back to the customer lifeline, indicating that the customer performs account selection at the start of the scenario This is followed by a funds transfer request from the customer to the system, and so on
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Sequence diagrams simply show the dynamic interaction among participants in the scenario and do not show the s tructural relationship between them If a use case has several flows, several sequence diagrams may be required to capture all aspects of the use case
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The question often comes up as to how complete the sequence diagrams should be In this early phase of requirements' capture and analysis, the sequence diagrams, by necessity, are relatively simple and may be incomplete This changes as you progress through use case analysis and refine these sequence diagrams with further details It is useful to have the main flow of each use case captured as a sequence diagram; however, capturing each and every
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alternate flow, especially when there may be a large number of them, is not necessary The main idea is to capture enough of them to have confidence that you have sufficient information for the next phase of the project
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Activity Diagrams
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An alternate, and some would argue a more powerful, tool in the UML arsenal for such use case analysis is the UML activity diagram For instance, activity diagrams can more easily show multiple paths taken as a result of actor decision and system exceptions This is difficult to show in a sequence diagram as sequence diagrams are intended to show interaction among objects in the context of a single scenario
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An activity diagram is similar in concept to a flowchart and is useful for modeling workflow as well as illustrating dynamic behavior of a use case and the detailed design of an operation
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An activity diagram shows the flow of control for the use case from one activity to the next An activity represents some action that takes place during the execution of the use case This typically maps to some work that has to be done as part of the workflow or execution of an operation in the context of a class
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Activities are represented by a round-ended rectangle An activity may be decomposed further into other activities, represented on another activity diagram
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Once an activity has completed, execution moves to the next state as determined by the available transitions on the activity Activity diagrams also support decision points In addition, it is possible to show parallel work required as part of an activity diagram by using the concept of synchronization bars
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A simple activity diagram representing the act of placing a phone call is shown in Figure 7 - 6
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Figure 7-6 A simple activity diagram
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Swim lanes can be used to show multiple objects on an activity diagram and how they work together to fulfill the overall use case
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Figure 7-7
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shows an activity diagram for the Transfer funds scenario The vertical lines indicate
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the boundary for the actors within the system This is an initial activity diagram and does not show all the details, such as conditional activity, and so on
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Figure 7-7 Activity diagram for the transfer funds scenario
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Summary
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Properly capturing requirements is essential to a system's success and its long-term viability In the UML, use case modeling offers a simple yet powerful means of capturing your requirements
In the use case model, actors are the primary instigators of use cases and represent entities outside the system Use cases can be thought of as a sequence of steps required to achieve something useful to an actor That is, a use case must yield something useful to the end user of the use case Sequence diagrams and activity diagrams are useful for precisely identifying and understanding the behavior of a use case