1. Many systems designed in the real world need to work in synchrony with each other. This is true for web servers and IOT devices synchronizing with each other for providing online services. Consider an online food ordering system that allows the customer to create an order on a smartphone, that is received by a web server on the cloud and then transmitted to a desktop at the restaurant. When the order has been received and when the order has been completed, the desktop app sends the update to the webserver for the smartphone app to be alerted at the customer end. a. Design transition system diagrams as channel systems for smartphone app, web server and the desktop app. b. Then perform the parallel composition of the three models. Now identify, are there any unsafe possibilities.

1. Many systems designed in the real world need to work in synchrony with each other. This is true for web servers and IOT devices synchronizing with each other for providing online services. Consider an online food ordering system that allows the customer to create an order on a smartphone, that is received by a web server on the cloud and then transmitted to a desktop at the restaurant. When the order has been received and when the order has been completed, the desktop app sends the update to the webserver for the smartphone app to be alerted at the customer end. a. Design transition system diagrams as channel systems for smartphone app, web server and the desktop app. b. Then perform the parallel composition of the three models. Now identify, are there any unsafe possibilities.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

1. Many systems designed in the real world need to work in
synchrony with each other. This is true for web servers and
IOT devices synchronizing with each other for providing
online services. Consider an online food ordering system
that allows the customer to create an order on a
smartphone, that is received by a web server on the cloud
and then transmitted to a desktop at the restaurant. When
the order has been received and when the order has been
completed, the desktop app sends the update to the
webserver for the smartphone app to be alerted at the
customer end.
a. Design transition system diagrams as channel systems
for smartphone app, web server and the desktop app.
b. Then perform the parallel composition of the three
models. Now identify, are there any unsafe
possibilities.
2. Consider the following two sequential hardware circuits:
(a) Give the transition systems of both hardware circuits.
(b) Determine the reachable part of the transition system of
the synchronous product of these transition systems.
Assume that the initial values of the registers are r1=0 and
r2=1.
X1
NOT
AND
r1
OR
yı
x2
AND
OR
property, or none of these
(a) A should never occur,
(b) A should occur exactly once,
r2
3. (Graduate students only) Consider the set AP = {A, B} of
atomic propositions. Formulate the following
Y2
properties as LT properties and characterize each of them as
being either an invariance, safety property, or liveness
(c) A and B alternate infinitely often,
(d) A should eventually be followed by B.

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