Birla Institute of
Technology & Science, Pilani
Work-Integrated
Learning Programmes Division
First Semester
2016-2017
Comprehensive
Examination
(EC-3 Regular)
Course No. : SS ZG653
Course Title : Software Architecture
Nature of Exam :
Open Book
Weightage :
50%
Duration :
3 Hours
Date of Exam : 05/11/2016 (FN)
No. of pages: 1
No. of questions: 4
Note:
1. Please follow all the Instructions
to Candidates given on the cover page of the answer book.
2. All parts of a question
should be answered consecutively. Each answer should start from a fresh
page.
3. Assumptions made if any,
should be stated clearly at the beginning of your answer.
Q.1.
In cloud computing
paradigm, what do you mean by Eventual Consistency? Explain with a scenario or
context where it is useful. Justify with suitable example. [5]
Q.2.
Enterprises are still
afraid of migrating the application to the cloud. Write down the five important
factors which can be the reason behind this fear. Justify each factor being the
reason for the ‘No cloud migration’. What approaches can be taken into
consideration to resolve such fear.
[10]
Q.3.
In a system, a single
event triggers a sequence of processing steps, each performing a specific
function. For example, in an online shopping website where a new order arrives
in the system in the form of a message. One requirement may be that the message
is encrypted to prevent eavesdroppers from spying on a customer's order. A
second requirement is that the messages contain authentication information in
the form of a digital certificate to ensure that orders are placed only by
trusted customers. In addition, duplicate messages could be sent from external
parties. To avoid duplicate shipments and unhappy customers, we need to
eliminate duplicate messages before subsequent order processing steps are
initiated. To meet these requirements, we need to transform a stream of
possibly duplicated, encrypted messages containing extra authentication data
into a stream of unique, simple plain-text order messages without the
extraneous data fields.
How
can we perform complex processing on a message while maintaining independence
and flexibility? Explain your approach using an appropriate design pattern.
Justify your answer. [10]
Q.4.
Assume,
‘Mars’ is online shopping application where various types of customers buy and
sell the products of different categories. In order to buy the product, user
has to register with this application. After registration process, the basic
operations of a buyer are searching for a product, viewing, managing shopping
cart and placing order.
Each user is directed to his/her
associated bank (where he/she has an account) to make payment. On the other
hand, an admin team who manages user’s profile, logs and sessions for smooth
purchase experience.
(a)
How will you
decompose the entire Mars application into modules as per given description
above. [3]
(b)
Identify and
list out the actors involved in the Mars application. [2]
(c)
Identify
various use cases involved and represent them via suitable use case
diagrams. [5+15]
***********
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