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Unified Modeling Language (UML)

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Unified Modeling Language (UML) Unified Modeling Language (UML) Troy Mockenhaupt Chi-Hang ( Alex) Lin Pejman ( PJ ) Yedidsion Overview Definition History Behavior Diagrams Interaction Diagrams Structural Diagrams Tools Effect on Software Engineering Definition A standard language for specifying, visualizing, and constructing software artifacts Non-restrictive Expressive and visual modeling language Independent of language and process History First modeling languages emerge 1970s “method wars” of the 1990s Methods began merging techniques 1994 – Booch and Rumbaugh unify Booch and Object Modeling Technique 1995-1996 Jacobson incorporates OOSE methods – term UML is coined 1997 – Object Management Group (OMG) accepted UML as standard History (cont.) UML 2.0 adopted in 2005 2.1.1 and 2.1.2 in 2007 ( never formally released ) UML 2.2 in 2009 UML 2.3 in 2010 UML 2.4.1 2011 UML 1.x vs 2.x 1.x vs 2.x Significant changes 1.x 2.x Activity Diagram Specialized form of Increasing the scope State Diagrams of usage Package Diagram Insufficient for large Added models Component Diagram No port and Added connectors Timing Diagram No syntax for timing Added purposes Behavior Diagrams ● Activity Diagram (basic program flow & capture decision points) ● Use Case Diagram (model user/system interactions) ● State Machine Diagram (“run state” of a model when it executes) Activity Diagram ● Shows the overall flow of control ● Comprises: choice, iteration, and concurrency ● Business and operational step-by-step workflows of components in a system ● A form of flowchart that has capability to express concurrency ● Graphical representations of workflows of stepwise activities and actions Activity Diagram (cont.) ● Similar to state machine diagrams ● Business process modeling ● Object-oriented equivalent of flow charts and data flow diagrams from structured development Activity Diagram (cont.) Use Case Diagram ● Interaction of users with the system ● Contains different types of users and the various ways they interact with the system ● Depicts Actors and their goals represented as use cases, as well as any dependencies among those use cases o Actors - entities external to the system Use Case Diagram (cont.) ● A use case typically includes: o Name and Description o Requirements (formal functional requirements) o Constraints (condition or restriction) o Scenarios (formal description of the flow of events) o Scenario diagrams (specific sequence of events between the system and the external actors) o Additional information (case specific) Use Case Diagram (cont.) ● Not a standalone model, but one that can be used in conjunction with other models ● Outline general behavior, therefore use case diagram should “focus on business goals rather than system goals” ● Not a technical outline of functionality, but provides the business reasoning and outcomes of the system Use Case Diagram (cont.) State Machine Diagram ● Nodes denote states ● Connectors denote state transitions ● Behavioral state machines o used to model the behavior of individual entities ● Protocol state machines o used to express usage protocols State Machine Diagram (cont.) ● Organize the way a device, computer program, or other (often technical) process works--always in exactly one of a number of possible states ● Overcome some of the limitations of traditional finite-state machines ● Support actions that depend on both the state of the system and the triggering event State Machine Diagram (cont.) ● Initial &Final States ● Transitions ● State Actions State Machine Diagram (cont.) Interaction Diagrams Communication Diagram Interaction Overview Diagram Sequence Diagram Timing Diagram Communication Diagram Interactions between objects in terms of sequenced messages Combination of info from Class, Sequence, and Use Case Diagrams Free-form arrangement of objects Chronological numbered labeling Similar to Sequence diagrams with focus on element interaction Communication Diagram (cont.) Interaction Overview Diagram Visualize control flow with nodes Frames of interaction diagrams Interaction diagrams are building blocks Deconstruct complex scenarios Activity diagram – initial, join, fork, decision, merge, and final Interaction occurrences and elements Interaction Overview Diagram(cont.) Sequence Diagram Detailed flow for use case realization Two-Dimensional Object instances and interactions Interaction order Sequence of object interactions Object lifelines Sequence Diagram (cont.) Timing Diagram Explore behavior of one or more objects during a given time period Similar to sequence diagram with axes reversed Concise and Robust notation Timing Diagram (cont.) Concise Notation Timing Diagram (cont.) Structural Diagram ● Class Diagram ● Object Diagram ● Composite Structure Diagram ● Component Diagram ● Package Diagram ● Deployment Diagram ● Profile Diagram Class Diagram ● Define Classes Diagram ● Introduce Class Diagram 1. Notations ● Relationships between classes Class Diagram (cont.) ● Class Diagram describes set of classes, interfaces and their relationships ● Class Diagram Notations: 1. Class Name 2. Properties of the classes with data types 3. Method names with data types 4. Visibility: +, #, ~, - (in the order of visibility) 5. Static members Class Diagram (cont.) Class Diagram (cont.) ● Dependency – A class needs to know about another class ● Association – A class contains the reference of an object to another class ● Aggregation – A class owns another class ● Composition – A class is made of other classes ● Inheritance – A class is a type of another class ● Constraints – 1. Invariants – must always be true 2. Pre conditions – check before execution 3. Post conditions – checked after execution ● Abstract Classes – Generic class, leaves implementation for sub classes ● Interfaces – Defines methods which must be implemented Class Diagram (cont.) Relationships between classes Class Diagram (cont.) Object Diagram ● Define Object Diagram: 1. Bringing classes to life 2. Demonstrates an instance of a class at a particular point of time ● Introduce Object Diagram Properties / Syntax: 1. Object, Object:Class, :Class 2. Links (Association) 3. Notes, Note connector 4. Use Object Constraint Language (OCL) Object Diagram (cont.) Composite Structure Diagram ● Define Composite Diagram 1. How objects create a big picture 2. How objects work together to achieve goals ● Deficiency of Class Diagram ● Introduce Composite Diagram ● Class Diagram V.S. Composite Diagram Composite Structure Diagram (cont.) Composite Structure Diagram (cont.) Component Diagram ● Define Component Diagram 1. Shows key components of a system 2. High-level picture of a system 3. Manage complexity and dependencies 4. Manageable, reusable and swappable 5. Good candidates are frequently used functionality: logger, XML parser, and shopping carts Component Diagram (cont.) ● Introduce Component Diagram 1. Components 2. Interfaces a. Provider interfaces (ball) on the left b. Required interfaces (socket) on the right 3. Dependencies and Inheritance a. Model dependencies from left to right b. Place child components below parent component c. Components should only depend on interfaces Component Diagram (cont.) A simple e-commerce system Package Diagram ● Define Package Diagram: 1. Organize most UML elements 2. Manage dependencies among packages 3. Package related elements into groups Package Diagram (cont.) ● Manage dependencies among packages 1. Avoid too many dependencies 2. Avoid cycles Package Diagram (cont.) Package related elements into groups: Package Diagram with Use Cases Deployment Diagram ● Define Deployment Diagram: Demonstrates the physical deployment of artifacts on nodes ● Introduce Deployment Diagram 1. Artifact – physical files that execute or used by software, e.g. .exe, .jar, .dlls, .java, .cpp, .xml, .txt 2. Node – hardware or software resources that can host software or related files, e.g. server, disk drives, OS, web server, application server 3. Device Node – physical resource (hardware) with processing capability 4. Execution environment– web server, application server, OS ● When to use Deployment Diagrams? Deployment Diagram (cont.) Early stage Deployment Diagram (cont.) Late stage Profile Diagram ● Define Profile Diagram: Customizes UML for a specific platform ● Introduce Profile Diagram: 1. Stereotypes – indicates a special usage 2. Tagged Values – additional information about the stereotype 3. Constraints ● Why Profile Diagram? Plug-ins, OMG profiles UML Tools ● Software applications that support some or all of the notations and semantics ● Types of Functionality supported: ● Diagramming - creating and editing ● Round-trip engineering: Code generation- derives from the diagrams part or all of the source code for the software system Reverse engineering- reads program source code as input and derives model data and corresponding graphical UML diagrams UML Tools (cont.) ● Limitations: o UML diagrams lack the detail that is needed to contain the same information as is covered with the program source o Source code often has more detailed information than in design diagrams ● Future use and development of tools UML Tools (cont.) ● Examples of current UML modeling tools: IBM Rational Rose, ArgoUML, BOUML, Dia, Enterprise Architect, MagicDraw UML, Modelio, PowerDesigner, Rational Rhapsody, Rational Software Architect, StarUML, and Umbrello ● Examples of development environments offering UML modeling tools: Eclipse (also includes reverse engineering architecture), NetBeans, and Visual Studio UML Tools (cont.) Effect on
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