Behavioral models describe the internal dynamic aspects of an information system that supports the business processes in an organization. In this chapter, we describe three UML diagrams that are used in behavioral modeling: sequence diagrams, communication diagrams, and behavioral state machines. | Chapter 7: Behavioral Modeling Objectives Understand the rules and style guidelines for sequence and communication diagrams and behavioral state machines. Understand the processes used to create sequence and communication diagrams and behavioral state machines. Be able to create sequence and communication diagrams and behavioral state machines. Understand the relationship between the behavioral models and the structural and functional models. Key Ideas Behavioral models describe the internal dynamic aspects of an information system that supports business processes in an organization Key UML behavioral models are: sequence diagrams, collaboration diagrams, and statechart diagrams BEHAVIORAL MODELS Behavioral Models Systems have static &dynamic characteristics Structural models describe the static aspects of the system Behavioral models describe the dynamics and interactions of the system and its components Behavioral models describe how the classes described in the structural models interact in support of the use cases. INTERACTION DIAGRAMS Interaction Diagram Components Objects an instantiation of a class Operations the behaviors of an instance of a class Messages information sent to objects to tell them to execute one of their behaviors Sequence Diagrams Illustrate the objects that participate in a use-case Show the messages that pass between objects for a particular use-case Sequence Diagram Syntax More Sequence Diagram Syntax Sample Sequence Diagram Steps to Build Sequence Diagrams Set the context Identify which objects will participate Set the lifeline for each object Lay out the messages from top to bottom of the diagram based on the order in which they are sent Add execution occurrence to each object‘s lifeline Validate the sequence diagram BEHAVIORAL STATE MACHINES Behavioral State Machines A dynamic model that shows the different states through which a single object passes during its life in response to events, along with its responses and actions Typically not used for all objects Just for complex ones Components of State Machines States values of an object’s attributes at a point in time Events change the values of the object’s attributes Transitions movement of an object from one state to another Actions atomic, non-decomposable processes Activities non-atomic, decomposable processes State Machine Syntax Sample State Machine Steps to Build a State Machine Set the context Identify the initial, final, and stable states of the object Determine the order in which the object will pass through the stable states Identify the events, actions, and guard conditions associated with the transitions Validate the behavioral state machine CRUD ANALYSIS CRUD Analysis Labels object interaction in 4 possible ways Create Read Update Delete Matrix representation of objects and interactions Most useful as a system-wide representation Sample CRUD Matrix Summary Behavioral Models Interaction Diagrams Behavioral State Machines CRUD Analysis
