An Introduction to UMLObjectivesIn this lesson, you will learn about : Object-oriented modeling Origin and evolution of UM...
An Introduction to UMLThe Object Oriented Approach The object-oriented approach views a system as a  collection of real-wo...
An Introduction to UMLFeatures of Object-Orientation Abstraction - represents the essential characteristics  of an object ...
An Introduction to UMLSoftware Development Life Cycle Software Development Life Cycle consists of four  phases that any so...
An Introduction to UMLObject-Oriented Modeling Modeling is breaking the complex problem into small  elements and arriving ...
An Introduction to UMLObject-Oriented Modeling(Contd.) UML defines various models in the software  engineering domain. The...
An Introduction to UMLUnified Modeling Language (UML)Is a standard modeling language used for modeling software systems of...
An Introduction to UMLGoals of UML The goals of the UML are:     To provide a simple and ready-to-use expressive      visu...
An Introduction to UMLUML is used to: Visualize the software system with well-defined  symbols Specify the software system...
An Introduction to UMLWhere is UML Used? Some of the most common domains where UML is  being currently used are:     Banki...
An Introduction to UMLUML: The Big Picture        Structural View               Implementation View                       ...
An Introduction to UMLViews in UMLUser View – represents the goals and objectives of the systemStructural View – represent...
An Introduction to UMLContext and Environment of a SystemA system addresses a problem and provides solutions to the proble...
An Introduction to UMLThe User View of a SystemRepresents the goals and objectives of various users and their requirements...
An Introduction to UMLActorsAre divided into four main categories:     Principal actors – people who directly interact wit...
An Introduction to UML Problem Statement 1.D.1  One of the sources used by Tebisco for recruiting  personnel is the intern...
An Introduction to UMLSolution:The actors identified are:Regional HR head where a vacancy exists, denoted as RHR(V)Other R...
An Introduction to UMLProblem Statement 1.P.1Employee referrals are one of the best sources used forrecruiting external ca...
An Introduction to UMLUse Cases Consist of elements that lie inside the system Are responsible for functionality and behav...
An Introduction to UMLDiagrammatic Conventions for DrawingUse Case Diagrams The user view of a system consists of use case...
An Introduction to UMLDiagrammatic Conventions for DrawingUse Case Diagrams(Contd.) Following is the diagrammatic represen...
An Introduction to UMLDiagrammatic Conventions for DrawingUse Case Diagrams(Contd.) Consider the following examples of use...
An Introduction to UMLDiagrammatic Conventions for DrawingUse Case Diagrams(Contd.)                    Enter Bill Details ...
An Introduction to UMLProblem Statement 1.D.2In the internal job postings process, the HR head of theregion where a vacanc...
An Introduction to UMLProblem Statement 1.D.2 (Contd.)Based on the interview proceedings, interview details areupdated and...
An Introduction to UMLSolution:                     Distribute                                                     RHR (O)...
An Introduction to UMLSolution:(Contd.)                      Match Skills        RHR (V)                    Arrange Interv...
An Introduction to UMLSolution:(Contd.)                    Accept / Reject Offer                           Letter        E...
An Introduction to UMLSolution:(Contd.)                    Arrange for Transfer RHR (O)                                   ...
An Introduction to UMLProblem Statement 1.P.2Dual Infosys Inc is going in for workflow automation. Oneof the workflows tha...
An Introduction to UMLSummaryIn this lesson you learned that: A class is a set of objects that share common  attributes an...
An Introduction to UMLSummary (Contd.)     Reusability     Resilience to change The phases in Software Development Life Cy...
An Introduction to UMLSummary (Contd.) The goals of UML are:     To provide a simple and ready-to-use expressive      visu...
An Introduction to UMLSummary (Contd.) Different kind of views in UML are:     The user view     The structural view     T...
Upcoming SlideShare
Loading in...5
×

Crj 3 1-a

281

Published on

Published in: Technology, Education
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
281
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
0
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Transcript of "Crj 3 1-a"

  1. 1. An Introduction to UMLObjectivesIn this lesson, you will learn about : Object-oriented modeling Origin and evolution of UML Architecture of UML User View Actor Use Cases©NIIT UML /Lesson 1/Slide 1 of 34
  2. 2. An Introduction to UMLThe Object Oriented Approach The object-oriented approach views a system as a collection of real-world objects Object-oriented systems are based on classes A class categorizes a set of objects that share common Attributes - represent the properties of the class Behaviors - represent the operations that can be performed by the class An object is an instance of a class and demonstrates the attributes and behaviors of the class©NIIT UML /Lesson 1/Slide 2 of 34
  3. 3. An Introduction to UMLFeatures of Object-Orientation Abstraction - represents the essential characteristics of an object or a class that differentiates it from other objects or classes with respect to the viewer’s perspective Inheritance - helps you generalize common attributes and behaviors in separate classes from which various subclasses can be derived Encapsulation - helps you hide unnecessary behaviors or attributes from the user Polymorphism - is the ability of an object to behave differently under different circumstances©NIIT UML /Lesson 1/Slide 3 of 34
  4. 4. An Introduction to UMLSoftware Development Life Cycle Software Development Life Cycle consists of four phases that any software-intensive system undergoes Inception - This is the first phase of the SDLC process. The idea of a new system is envisaged at this stage Elaboration - This is the second phase of the SDLC process. The system vision and architecture are defined at this stage Construction - This is the third phase of the SDLC process. The software is coded to form an executable base, which is ready to be deployed Transition - This is the last phase of the SDLC process. The software is handed over to the end user and is tested for defects©NIIT UML /Lesson 1/Slide 4 of 34
  5. 5. An Introduction to UMLObject-Oriented Modeling Modeling is breaking the complex problem into small elements and arriving at the solution of the problem Models help you visualize and specify different parts of a system Models also show how different parts are related to one another and help in visualizing their working©NIIT UML /Lesson 1/Slide 5 of 34
  6. 6. An Introduction to UMLObject-Oriented Modeling(Contd.) UML defines various models in the software engineering domain. The models and their description are given below: The class model describes the static structure The state model represents the dynamic behavior of objects The use case model explains the requirements of the user The interaction model describes the messages flows The implementation model contains the work units The deployment model contains details that pertain to process allocation©NIIT UML /Lesson 1/Slide 6 of 34
  7. 7. An Introduction to UMLUnified Modeling Language (UML)Is a standard modeling language used for modeling software systems of varying complexitiesProvides a set of notations and rules for using any kind of systemFocus is on creating simple, well-documented and easy-to-understand software models©NIIT UML /Lesson 1/Slide 7 of 34
  8. 8. An Introduction to UMLGoals of UML The goals of the UML are: To provide a simple and ready-to-use expressive visual modeling language To be process-independent To be language-independent©NIIT UML /Lesson 1/Slide 8 of 34
  9. 9. An Introduction to UMLUML is used to: Visualize the software system with well-defined symbols Specify the software system and help in building precise, unambiguous, and complete models Construct models of the software system that can directly communicate with a variety of programming languages Document models of the software system by expressing requirements of the system during its development and deployment stages©NIIT UML /Lesson 1/Slide 9 of 34
  10. 10. An Introduction to UMLWhere is UML Used? Some of the most common domains where UML is being currently used are: Banking services Defense systems Distributed Web-based services Enterprise Information systems Medical systems Aerospace systems.©NIIT UML /Lesson 1/Slide 10 of 34
  11. 11. An Introduction to UMLUML: The Big Picture Structural View Implementation View User View Behavioral View Environment View©NIIT UML /Lesson 1/Slide 11 of 34
  12. 12. An Introduction to UMLViews in UMLUser View – represents the goals and objectives of the systemStructural View – represents the static or idle state of the systemBehavioral View – represents the dynamic or changing state of the systemImplementation View – represents the distribution of the logical elements of the systemEnvironment View – represents the distribution of the physical elements of the system©NIIT UML /Lesson 1/Slide 12 of 34
  13. 13. An Introduction to UMLContext and Environment of a SystemA system addresses a problem and provides solutions to the problem within a framework. This framework is referred to as the context of a systemThe environment of a system specifies the functionality of the system from the user’s point of view©NIIT UML /Lesson 1/Slide 13 of 34
  14. 14. An Introduction to UMLThe User View of a SystemRepresents the goals and objectives of various users and their requirements from the systemRepresents that part of the system with which the user interactsConsist of: System Users - System users can be human users or other systems that interact directly with the system Actors - Actors are the elements that lie outside the system, and therefore are called the external entities of a system. They are used to model system users©NIIT UML /Lesson 1/Slide 14 of 34
  15. 15. An Introduction to UMLActorsAre divided into four main categories: Principal actors – people who directly interact with the system. Secondary actors – people who are involved in maintenance of the system External hardware – The hardware that is a part of system other than the computer that runs an application Other systems –The external systems with which your system needs to interact for its working©NIIT UML /Lesson 1/Slide 15 of 34
  16. 16. An Introduction to UML Problem Statement 1.D.1 One of the sources used by Tebisco for recruiting personnel is the internal job postings process. Whenever a vacancy arises, the Human Resource (HR) head of the region informs all the employees of that region and also sends the information to other regional HR heads inviting applications. The other regional HR heads then place the vacancy information on the notice board. All interested employees send their applications to the HR head of the region where the vacancy exists. Identify the various actors interacting with the system.©NIIT UML /Lesson 1/Slide 16 of 34
  17. 17. An Introduction to UMLSolution:The actors identified are:Regional HR head where a vacancy exists, denoted as RHR(V)Other Regional HR head, denoted as RHR(O)All employees of Tebisco, denoted as EMP©NIIT UML /Lesson 1/Slide 17 of 34
  18. 18. An Introduction to UMLProblem Statement 1.P.1Employee referrals are one of the best sources used forrecruiting external candidates at Tebisco. In this processan employee recommends a candidate. Whenever avacancy arises, the HR head of the region informs all theemployees of that region and also sends the informationto other regional HR heads inviting applications. Theregional HR head then places the vacancy informationon the notice board. Employees send the details ofcandidates being recommended by them to the HR headof the region where the vacancy exists. After anemployee sends in the recommendation, the regional HRhead sends an acknowledgement of the receipt of theapplication to the candidate.Identify the various actors interacting with the system.©NIIT UML /Lesson 1/Slide 18 of 34
  19. 19. An Introduction to UMLUse Cases Consist of elements that lie inside the system Are responsible for functionality and behavior of the system Are set of transactions performed by the system when an actor initiates an event or an action Represent all the possible events that can occur in all possible scenarios©NIIT UML /Lesson 1/Slide 19 of 34
  20. 20. An Introduction to UMLDiagrammatic Conventions for DrawingUse Case Diagrams The user view of a system consists of use case diagrams A use case diagram contains actors, use cases, and their relationships A use case diagram represents the functionality provided by the system to external entities Use case diagrams consist of actors and use cases©NIIT UML /Lesson 1/Slide 20 of 34
  21. 21. An Introduction to UMLDiagrammatic Conventions for DrawingUse Case Diagrams(Contd.) Following is the diagrammatic representation of use case diagrams Use Case Name Actor Name©NIIT UML /Lesson 1/Slide 21 of 34
  22. 22. An Introduction to UMLDiagrammatic Conventions for DrawingUse Case Diagrams(Contd.) Consider the following examples of use cases in the billing system of the department store: Enter Bill Details Calculate Total Amount Print Bill©NIIT UML /Lesson 1/Slide 22 of 34
  23. 23. An Introduction to UMLDiagrammatic Conventions for DrawingUse Case Diagrams(Contd.) Enter Bill Details Clerk Calculate Total Amount Print Bill Clerk©NIIT UML /Lesson 1/Slide 23 of 34
  24. 24. An Introduction to UMLProblem Statement 1.D.2In the internal job postings process, the HR head of theregion where a vacancy exists informs the employees ofthat region and other regional HR heads. The otherregional HR heads inform employees by putting up anotice with the vacancy information.In response to this information, employees from variousregions send their applications to the HR head of theregion where the vacancy exists.The skills of the applicants are then matched with theskills required for the vacancy. Applicants who possessthe required skills are short-listed and an interviewschedule is drawn. The short-listed applicants areinformed about the interview schedule.©NIIT UML /Lesson 1/Slide 24 of 34
  25. 25. An Introduction to UMLProblem Statement 1.D.2 (Contd.)Based on the interview proceedings, interview details areupdated and all the selected applicants are given a newoffer letter. The applicant informs the HR head of theregion where the vacancy exists, either by accepting ordeclining the offer letter. After the employee accepts theoffer letter, a transfer request is sent to the HR head ofthe current region of the employee. The respectiveregion processes the transfer details and sends it to thenew region where the employee has been transferred.The new region then updates the employee details andsends the transfer documents to the employee.Identify the various use cases involved in the internal jobpostings process and represent the user view of thesystem.©NIIT UML /Lesson 1/Slide 25 of 34
  26. 26. An Introduction to UMLSolution: Distribute RHR (O) Information RHR (V) EMP Send Application EMP RHR (V)©NIIT UML /Lesson 1/Slide 26 of 34
  27. 27. An Introduction to UMLSolution:(Contd.) Match Skills RHR (V) Arrange Interview EMP Update Interview Details RHR (V) Generate Offer Letter EMP©NIIT UML /Lesson 1/Slide 27 of 34
  28. 28. An Introduction to UMLSolution:(Contd.) Accept / Reject Offer Letter EMP RHR (V) Transfer Request RHR (V) RHR (O)©NIIT UML /Lesson 1/Slide 28 of 34
  29. 29. An Introduction to UMLSolution:(Contd.) Arrange for Transfer RHR (O) RHR (V) Update Transfer Details RHR (V) EMP©NIIT UML /Lesson 1/Slide 29 of 34
  30. 30. An Introduction to UMLProblem Statement 1.P.2Dual Infosys Inc is going in for workflow automation. Oneof the workflows that they want to automate is leaveprocessing. The process followed by Dual Infosys Inc isdiscussed below.The employee sends an application for a leave to thesupervisor. Supervisor sanctions or rejects the leaveapplication and sends it to the HR Operations (HR(O)).HR(O) verifies the leave balance and processes theleave by updating the leave details and sends theapproval to the employee.Identify the various use cases involved in the employeereferral process of leave application and represent theuser view of this system.©NIIT UML /Lesson 1/Slide 30 of 34
  31. 31. An Introduction to UMLSummaryIn this lesson you learned that: A class is a set of objects that share common attributes and behaviors. Features of object-orientation are: Abstraction Inheritance Encapsulation Polymorphism Advantages of object-oriented approach are: Realistic modeling©NIIT UML /Lesson 1/Slide 31 of 34
  32. 32. An Introduction to UMLSummary (Contd.) Reusability Resilience to change The phases in Software Development Life Cycle are: Inception Elaboration Construction Transition UML provides a set of notations and rules for using different kind of systems©NIIT UML /Lesson 1/Slide 32 of 34
  33. 33. An Introduction to UMLSummary (Contd.) The goals of UML are: To provide a simple and ready-to-use expressive visual modeling language To be process independent To be language independent©NIIT UML /Lesson 1/Slide 33 of 34
  34. 34. An Introduction to UMLSummary (Contd.) Different kind of views in UML are: The user view The structural view The behavioral view The implementation view The environment view©NIIT UML /Lesson 1/Slide 34 of 34

×