Make Sequence Diagram draw from Supermarket transaction with Type of Combined Fragments as follow: Operator Purpose alt Branches & loops loop alternative interaction repeated interaction
Make Sequence Diagram draw from Supermarket transaction with Type of Combined Fragments as follow: Operator Purpose alt Branches & loops loop alternative interaction repeated interaction
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
Related questions
Question
How to answer with correct, Sequence Diagram draw from Supermarket transaction with Type of Combined Fragments as per attached based on object oriented modeling?

Transcribed Image Text:Make Sequence Diagram draw from Supermarket
transaction with Type of Combined Fragments as follow:
Operator
Purpose
alt
loop
Branches &
loops
alternative interaction
repeated interaction
![BaL - Alternative (alt)
▪ To model alternative sequences
▪ Guards are used to select the one
path to be executed
■ Guards
alt [...]
[...]
I
▪ Modeled in square brackets
▪ default: true
▪ predefined: [else]
Multiple operands
▪ Guards had to be disjoint to
avoid indeterministic behavior
alt
:Student
opt
register(matNo, exam)
[status == ok]
register: "ok"
:StudentAdmin
System
[status == waiting list free]
register: "w"
[else]
[register on WL == true]
register(matNo, exam)
register: "ok"
register: "error"
Database
enter(matNo, exam)
statusenter: status.
enterWL(matNo, exam)
enterWL: "ok"
BaL- Repeated (loop)
■ To express that a sequence is to be executed repeatedly
Exactly one operand
Keyword loop followed by the minimal/maximal number of iterations (min..max) or (min, max)
default: (*).. no upper limit
I
I
▪ Guard
■ Evaluated as soon as the minimum number of iterations has taken place
▪ Checked for each iteration within the (min, max) limits
If the guard evaluates to false, the execution of the loop is terminated
Guard
loop is executed
at least once,
then as long as
a<1 is true
EXAMPLE DIAGRAM OF COMBINED FRAGMENTS AS REFERENCE TO ANSWER THE QUESTIONS!
Max
Min.
loop(...) [...]
loop(1,*)
[a<1]
K
1
Notation alternatives:
loop (3,8)= loop (3..8)
loop (8,8) loop (8)
loop loop (*) = loop (0,*)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F273770c6-75e4-47ab-8933-03e6ac16f901%2Fa3b0b7d5-f852-4fcc-aae4-c7254564226a%2Fngxqmvv_processed.jpeg&w=3840&q=75)
Transcribed Image Text:BaL - Alternative (alt)
▪ To model alternative sequences
▪ Guards are used to select the one
path to be executed
■ Guards
alt [...]
[...]
I
▪ Modeled in square brackets
▪ default: true
▪ predefined: [else]
Multiple operands
▪ Guards had to be disjoint to
avoid indeterministic behavior
alt
:Student
opt
register(matNo, exam)
[status == ok]
register: "ok"
:StudentAdmin
System
[status == waiting list free]
register: "w"
[else]
[register on WL == true]
register(matNo, exam)
register: "ok"
register: "error"
Database
enter(matNo, exam)
statusenter: status.
enterWL(matNo, exam)
enterWL: "ok"
BaL- Repeated (loop)
■ To express that a sequence is to be executed repeatedly
Exactly one operand
Keyword loop followed by the minimal/maximal number of iterations (min..max) or (min, max)
default: (*).. no upper limit
I
I
▪ Guard
■ Evaluated as soon as the minimum number of iterations has taken place
▪ Checked for each iteration within the (min, max) limits
If the guard evaluates to false, the execution of the loop is terminated
Guard
loop is executed
at least once,
then as long as
a<1 is true
EXAMPLE DIAGRAM OF COMBINED FRAGMENTS AS REFERENCE TO ANSWER THE QUESTIONS!
Max
Min.
loop(...) [...]
loop(1,*)
[a<1]
K
1
Notation alternatives:
loop (3,8)= loop (3..8)
loop (8,8) loop (8)
loop loop (*) = loop (0,*)
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