1. 333 EA-1 CSE333 Distributed Component Systems Final Exam Advice and Hints Prof. Steven A. Demurjian, Sr. Computer Science & Engineering Department The University of Connecticut 191 Auditorium Road, Box U-155 Storrs, CT 06269-3155 steve@engr.uconn.edu http://www.engr.uconn.edu/~steve (860) 486 - 4818

2. 333 EA-2 CSE333 Core Material  OO Reuse Methodology and Framework  What are the Key Reuse Concepts?  Where Does OO Reuse Fit into DCS?  Interplay of Reuse and Other Course Concepts?  UML and Components:  Can UML be Utilized to Effectively Architect and Design a Distributed Application?  What is role of UML/Components in DCS?  Relationship of UML to other Course Topics?  Service-Based Computing  Is JINI/CORBA effective as Middleware?  How can JINI/CORBA work in DCS Setting?

3. 333 EA-3 CSE333 Core Material  Software Architecture  What are the Different Styles?  What Styles can be Leveraged for DCS?  Enterprise Computing and Interoperability  Motivation and Interoperability Strategies  Two, Three, Four Tier Architectures  Pulling Pieces Together for DCS  Optimal Object Deployment  Concepts: Motivation, Philosophy, Justification, Potential usage, Benefits, Goals, Approach  Can/Does Security and/or Reuse Impact on Deployment?

4. 333 EA-4 CSE333 Core Material  UML + Security  Security Issues and Security Models  RBAC vs. MAC vs. DAC  Unique Characteristics of DCP  Security Design with UML  Role Slice Diagram + AOP/Enforcement Code Generation  Model and Framework for Security in Distributed Setting  Incorporation of RBAC, MAC, Constraints  What is Role of Assurance in Security?  Relationship to Other Course Topics?

5. 333 EA-5 CSE333 Supplemental Material/Key Concepts  Supplemental Material: No Direct Questions  Java: Risks/Benefits: Lecture/Readings  SW Engr. and OO Design: Lecture/Readings  Some Key Readings and New Slides  Reading List as Identified on Course Web Page  Interoperability Strategies  Enterprise Computing/Interoperability Slides  See end of this talk for copies  New Two, Three, and Four Tier Architectures (see end of this talk)  Final Exam Handout on UConn-X-CHG (see Course Web Page)

6. 333 EA-6 CSE333 Role During Exam  Software Engineer/Designer/Architect  Conduct Design and Analysis  Solve Problems and Critique Approaches  Write/Outline Algorithm  Design, Analyze, Understand and Extrapolate  Show Knowledge by Demonstrating the Interplay and Interdependencies Among Topics  Shift Perspective from Designer to Builder to User Throughout Exam  Don’t Hesitate to Utilize  Material from Other Courses  Practical and On-the-Job Experience  Exam Open Book/Open Notes

7. 333 EA-7 CSE333 Hints for Taking Exam  Read the Questions Carefully!  Ask Questions if you are Confused!  Answer Questions in Any Order  Organized to fit on minimum number of pages  Answer “Easiest” questions for you!  Assess Points per Time Unit  120 minutes = 120 points  30 minutes = 30 points  10 minutes = 10 points  Length of Answer Matches Points  5 points = 1/4 page = 3 or 4 sentences  30 points - if 1/4 page - likely few points!  Exam Designed to be Longer than 120 Minutes!

8. 333 EA-8 CSE333 Hints for Taking Exam  Don't Define Concepts  E.G., Ask About Concept X, Don't Explain Concept X, Just Answer the Question and I'll Know If You Know Concept X  Don't Panic, Read and Review Course Materials Prior to Exam!  Don't Be Afraid to Not Answer a Question  60% Correct for 100 Points = 60 Points  90% Correct F0r 80 Points = 72 Points  Partial Credit Is the Norm  If I Ask You to Pick and Analyze a Concept - for a 5 Pt Problem You Get 1 for the Concept and 4 for the Analysis.

9. 333 EA-9 CSE333 Concentration of Exam  Concentration on Issues Related to  UML, Reuse, Reuse + UML  Software Architectures/Interoperability  Service-Based Computing + Security  Optimal Deployment  Security + UML - RBAC, MAC, DAC  Material Examined w.r.t.  Evaluative Questions  Constructive Questions - Including Algorithms  Relationship between Concepts  Critiquing Design Ideas/Alternatives  Extension of Project/Class Concepts  Predicting/Analyzing “Future”

10. 333 EA-10 CSE333 Possible Questions  4 to 6 Total Multi-Part Questions -- Possibilities…  Security  Designing Multi-Tier Applications  “Looking Ahead to Future”  Reusability  Demonstrating Knowledge by Explaining the Relationship of Topics  Well Developed, Thoughtful, Organized Answers  Bullet Lists and Other Organizations Encouraged  Enough Details to Clearly Indicate that you Understand the Concepts  Avoid Definitions and Run-on Explanations

11. 333 EA-11 CSE333 Extra Slides for Final Examination  Two Sets of Slides  From Interoperability/Enterprise Computing Material Reviewed in Class  Slides 12 through 16  New Material on 2, 3, and 4 Tier Architectures  Slides 17 through 30

12. 333 EA-12 CSE333 Architectural Alternatives & Framework  Reviewing Architectural Variants  Java Client to Legacy Appl. via RDBS  ORB Integration of Java Client and Legacy Application  Java Client with Wrapper to Legacy Appl.  One COTS and One Legacy Appl. to Java Clients  Quick Review of Select Material from Summer 1997 White Paper:  “The Java Programming Language: Impact upon the Army Technical Architecture (ATA) and Joint Technical Architecture (JTC)” Demurjian/Shin

13. 333 EA-13 CSE333 Java Client to Legacy App via RDBS Java Client to Legacy App via RDBS Java Client LegacyApplication RelationalDatabaseSystem(RDS) Transformed Legacy Data Updated Data Extract and Generate Data Transform and Store Data

14. 333 EA-14 CSE333 ORB Integration of Java Client and Legacy Application Java Client LegacyApplication JavaWrapper Object Request Broker (ORB) CORBA is the Medium of Info. Exchange Requires Java/CORBA Capabilities

15. 333 EA-15 CSE333 Java Client with Wrapper to Legacy Application LegacyApplication Network Java Client Java Application Code WRAPPER Mapping Classes JAVA LAYER NATIVE LAYER Native Functions (C++) RPC Client Stubs (C) Interactions Between Java Client and Legacy Appl. via C and RPC C is the Medium of Info. Exchange Java Client with C++/C Wrapper

16. 333 EA-16 CSE333 One COTS and One Legacy Application to Java Clients Network Java Application Code JAVA NETWORK WRAPPER Mapping Classes NATIVE LAYER JAVA LAYER Native Functions that Map to COTS Appl Java Client Java Application Code JAVA NETWORK WRAPPER Mapping Classes NATIVE LAYER JAVA LAYER Native Functions that Map to Legacy Appl COTS Application Legacy Application Java is Medium of Info. Exchange - C/C++ Appls with Java Wrappers

17. 333 EA-17 CSE333 Two-Tier, Three-Tier, Four-Tier Example Architectures From: http://java.sun.com/javaone/javaone98/sessions/T400/index.html

18. 333 EA-18 CSE333 Wombat Securities  Web Access to Brokerage Accounts  Only HTML Browser Required on Front End  "Brokerbean" EJB Provides Business Logic  Login, Query, Trade Servlets Call Brokerbean  Use JNDI to Find EJBs, RMI to Invoke Them  Order and History Records from Java Blend Product  Records Mapped to Oracle Tables, JDBC Calls

19. 333 EA-19 CSE333 Four-Tier Architecture Example

20. 333 EA-20 CSE333 Nocturnal Aviation, Inc.  Passenger Check-in for Regional Airline  Local Database for Seating on Today's Flights  Clients Invoke EJBs at Local Site Through RMI  EJBs Update Database and Queue Updates  JMS Queues Updates to Legacy System  DBC API Used to Access Local Database  JTS Synchs Remote Queue With Local Updates

21. 333 EA-21 CSE333 Three-Tier Example

22. 333 EA-22 CSE333 Santa Cruz Widgets  Small Manufacturer Previously on C++  New Order Entry, Inventory, and Invoicing Applications in Java Programming Language  Existing Customer and Order Database  Most of Business Logic in Stored Procedures  Tool-generated GUI Forms for Java Objects  Located Company on Web Using Widgets and Tcl, but Not Widgets and Java

23. 333 EA-23 CSE333 Santa Cruz Widgets (2-tier)

24. 333 EA-24 CSE333 Two-Tier, Three-Tier, Four-Tier Example Architectures From: http://java.sun.com/javaone/javaone98/sessions/T400/index.html

25. 333 EA-25 CSE333 Wombat Securities  Web Access to Brokerage Accounts  Only HTML Browser Required on Front End  "Brokerbean" EJB Provides Business Logic  Login, Query, Trade Servlets Call Brokerbean  Use JNDI to Find EJBs, RMI to Invoke Them  Order and History Records from Java Blend Product  Records Mapped to Oracle Tables, JDBC Calls

26. 333 EA-26 CSE333 Four-Tier Architecture Example

27. 333 EA-27 CSE333 Nocturnal Aviation, Inc.  Passenger Check-in for Regional Airline  Local Database for Seating on Today's Flights  Clients Invoke EJBs at Local Site Through RMI  EJBs Update Database and Queue Updates  JMS Queues Updates to Legacy System  DBC API Used to Access Local Database  JTS Synchs Remote Queue With Local Updates

28. 333 EA-28 CSE333 Three-Tier Example

29. 333 EA-29 CSE333 Santa Cruz Widgets  Small Manufacturer Previously on C++  New Order Entry, Inventory, and Invoicing Applications in Java Programming Language  Existing Customer and Order Database  Most of Business Logic in Stored Procedures  Tool-generated GUI Forms for Java Objects  Located Company on Web Using Widgets and Tcl, but Not Widgets and Java

30. 333 EA-30 CSE333 Santa Cruz Widgets (2-tier)