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COMP 6231

Note: The assignments must be done individually and submitted electronically.
Distributed Flight Reservation System (DFRS) using Java IDL
In this assignment, you are going to implement the Distributed Flight Reservation System
(DFRS) from Assignment 1 in CORBA using Java IDL. In addition to the 3 operations in
Assignment 1 (namely, bookFlight, getBookedFlightCount, and editFlightRecord) the
following operation also needs to be implemented.
• transferReservation (PassengerID, CurrentCity, OtherCity)
This function is used by a manager (ManagerID) to transfer a previously made
flight reservation i.e. passenger record (PassengerID) from the CurrentCity to the
OtherCity. When a manager invokes this method through a MangerClient program,
the server associated with the CurrentCity checks whether the passenger
(PassengerID) has the specified flight reservation on it and then transfers the
reservation with same details to the OtherCity, using UDP/IP messages (instead of
invoking the bookFlight function at the other server). Note that creating the
required reservation at the OtherCity and cancelling the existing reservation at the
CurrentCity should be done atomically (that is, both should be done or none should
be done) using UDP/IP messages.
In this assignment you are going to develop this modified DFRS application in CORBA
using Java IDL. Specifically, do the following:
• Write the Java IDL interface definition for the modified DFRS with all the 4 specified
• Implement the modified DFRS in CORBA. You should design a server that maximizes
concurrency. In other words, use proper synchronization that allows multiple officers to
perform operations for the same or different records at the same time.
• Test your application by running multiple clients (Passengers and Managers) with the
3 servers. Your test cases should check correct concurrent access of shared data, and
the atomicity of transferReservation operation.
Your submission will be graded for correct and efficient implementation of the
transferReservation operation in addition to correct use and implementation of mutual
exclusion in accessing shared data and proper exploitation of concurrency to achieve high
COMP 6231 (Distributed System Design), Fall 2016 — Assignment 2 Page 2
Marking Scheme
[30%] Design Documentation: Describe the techniques you use and your architecture,
including the data structures. Design proper and sufficient test scenarios and
explain what you want to test. Describe the most important/difficult part in this
assignment. You can use UML and text description, but limit the document to 10
pages. Submit the documentation and code by the due date; print the
documentation and bring it to your demo.
[70%] Demo in the Lab: You have to register for a 5-minute demo. Please come to the lab
session and choose your preferred demo time in advance. You cannot demo without
registering, so if you did not register before the demo week, you will lose 40% of the
marks. Your demo should focus on the following.
[50%] Correctness of code: Demo your designed test scenarios to illustrate the
correctness of your design. If your test scenarios do not cover all possible
issues, you’ll lose part of mark up to 40%. You will also be evaluated on
the implementation of your design.
[20%] Questions: You need to answer some simple questions (like what we’ve
discussed during lab tutorials) during the demo. They can be theoretical
related directly to your implementation of the assignment.
If you are having difficulties understanding sections of this assignment, feel free to email
the Teaching Assistant Mr. Harpreet Narula at [email protected] It is
strongly recommended that you attend the tutorial sessions which will cover various
aspects of the assignment.

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