Suppose you need to ensure that no more than 2 instances of a certain class C exist at any time. Illustrate briefly how this design requirements can be addressed with a variant of the Singleton pattern, giving a specification in pseudo-code of the public operation getInstance(Int) that needs to be in C; assume that such operation receives as input an integer with value 1 or 2, meaning that the respectively first or the second instance of C is to be returned by said operation.
Suppose you need to ensure that no more than 2 instances of a certain class C exist at any time. Illustrate briefly how this design requirements can be addressed with a variant of the Singleton pattern, giving a specification in pseudo-code of the public operation getInstance(Int) that needs to be in C; assume that such operation receives as input an integer with value 1 or 2, meaning that the respectively first or the second instance of C is to be returned by said operation.
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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Suppose you need to ensure that no more than 2 instances of a certain class C exist at any time. Illustrate briefly how this design requirements can be addressed with a variant of the Singleton pattern, giving a specification in pseudo-code of the public operation getInstance(Int) that needs to be in C; assume that such operation receives as input an integer with value 1 or 2, meaning that the respectively first or the second instance of C is to be returned by said operation.
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