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Uni ed Modeling Language
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Sequence diagram
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sequence of behavior. This diagram is simple and logical, so as to make the sequence and flow of control obvious (see Figure 3-6).
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A collaboration diagram models interactions among objects; objects interact by invoking messages on each other. A collaboration diagram groups together the interactions among different objects. The interactions are listed as numbered interactions that help to trace the sequence of the interactions. The collaboration diagram helps to identify all the possible interactions that each object has with other objects. See Figure 3-7, where the interactions required to make a trade in our 11 case study are illustrated. New in UML 2.0 is the communication diagram. It is a simplified version of the UML 1.x collaboration diagram, which models the interactions between objects using sequenced messages. Communication diagrams represent a combination of information taken from class, sequence, and use case diagrams describing both the static and dynamic parts of a system. Communication and sequence diagrams describe similar information and can typically be transformed into one another easily. However, communication diagrams use the free-form arrangement of objects and links as used in object diagrams. In order to maintain the ordering of messages in such a free-form diagram, messages are labeled with a chronological number and placed near the link the message is sent over. Reading a communication diagram involves starting at message 1.0, and following the messages from object to object.
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3: Object-Oriented Analysis and Design
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The component diagram represents the high-level parts that make up the modeled application. This diagram is a high-level depiction of the components and their relationships. A component diagram depicts the components refined post-development or construction phase. See Figure 3-8, which depicts a trading application, the JEE application server it executes on, and the session beans used in the application.
Deployment Diagram
A deployment diagram puts it all together and captures the configuration of the runtime elements of the application. This diagram is obviously most useful when an application is complete and ready to be deployed. See Figure 3-9, which depicts the nodes in our trading application, i.e., a JEE server, a database server it accesses, and the user workstation used to access the JEE application. Each of these nodes hosts components whose interaction is also illustrated.
FIGURE 3-8
Component diagram
Uni ed Modeling Language
FIGURE 3-9
Deployment diagram
Stereotypes
A stereotype is a new class of modeling element that is introduced during modeling time. Certain restrictions are in place: stereotypes must be based on certain existing classes in the Meta model, and they may extend those classes only in certain predefined ways. They provide an extensibility mechanism for UML.
Practical Use of UML Diagrams
The scope of a typical software system is one of the barriers preventing the thorough understanding necessary for effective maintenance of systems. Even standard visualization approaches such as graphs and flow charts are overwhelming when attempting to depict a system. As you start to analyze such a system, you often want to begin with a high-level understanding of the overall structure and design of the system. You then delve into lower-level details once you have bounded the problem at hand. And at other times, the scope of the problem requires that you continue to work from the higher-level view.
3: Object-Oriented Analysis and Design
UML provides a number of abstraction mechanisms to help you study the highlevel architecture of your software. Within the Unified Modeling Language notation, diagrams are the primary representation of a system. UML will help you understand the objects, interactions, and relationships of your system software and hardware.
Use Case Diagram
The use case lends itself to a problem-centric approach to analysis and design, providing an understanding and a model of your system from a high-level business perspective that is, how a system or business works or how you wish it to work. The use case diagram represents the functionality of a system as displayed to external interactions as actors of the system. A use case view represents the interface or interfaces that a system makes visible to the outside world, the external entities that interact with it, and their interrelationships. Each use case step is either automated or manual. The objective of each step is to make a business decision or carry out an action. We typically assign responsibility for each business decision and action either to the system in the case of an automated action or to the actor in the manual case. This responsibility impacts the system delivered because the automated steps manifest themselves as system operations to make these decisions or execute these actions. The diagram represents the processes within the system, which are visible to the outside world that is, the actors of the system being modeled and the relationships among them. Use cases are the functions or services of the system those that are visible to its actors. They constitute a complete unit of functionality provided by a system as manifested by sequences of messages exchanged among the system and one or more actors together with actions performed by the system. Actors are representative of the role of an object outside of a system that interacts directly with it as part of a complete work unit. An actor element characterizes the role played by an outside object, where one physical object may play multiple positions. For example, one entity may actually play different positions and assume different identities. You can think of use case as a model that describes the processes of a business order processing, for example and its interactions with external parties such as clients and vendors. It is helpful in identifying the fundamental components of a system, namely the following:
n The business processes of the system n External entities of the system n The relationships among them
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