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Consider a system that includes a database client and two redundant database servers. Both database servers are identical: the first acts as a main server, the second acts as a hot back-up in case the main server fails. The database client accesses the servers through a single component called a "gateway," hence hiding from the client which server is currently being used. A separate policy object called a "watchdog" monitors the requests and responses of the main server and, depending on the responses, tells the gateway whether to switch over to the back-up server. What do you call this design pattern? Draw a UML class diagram to justify your choice.
Using the class sphere given on pages 145-146, write a program that instantiates four sphere objects (assigning a radius to each instance) and adds them to a pointer-based linked list
The following output was obtained from a computer program that performed a two-factor ANOVA on a factorial experiment.
a) What functions would such an embedded system control? b) What functions of a normal desktop or laptop operating system would NOT be found in such an embedded system?
Implement a class IceCreamCone with methods getSurfaceArea() and getVolume(). In the constructor, supply the height and radius of the cone. Be careful when looking up the formula for the surface area-you should only include the outside area along ..
Task Background: Graphs and trees provide you with ways to visualize data sets, and the opportunity to do analysis on the data (e.g., shortest path). Knowing the structure of a database enables you to choose a proper algorithm for searching for..
Kennametal, a $2 billion maker of construction tools, has spent $10 million on ERP maintenance contracts during the past 13 years and not once could the company take advantage of upgrades, says CIO Steve Hanna. The company's implementation was too..
A 2-3-4 tree can be used as a sorting machine. Write a sort() method that's passed an array of key values from main() and writes them back to the array in sorted order.
This project provides a variety of facility to the users and saves our valuable time and energy. It aims at developing the computers internal code to user readable code and find out the exact ASCII value.
What features of HTML5 are changing the way Web sites are built? Is HTML5 a disruptive technology, and if so, for whom?
Based on your research, write a 6-8 page paper that researches the use, adoption, and implementations of two different Web server technologies. The paper should also discuss the costs and support considerations of the Web server applications.
You are using the RSA algorithm to encrypt and decrypt messages. Your public key is n = 119 and e = 37. (a) Determine the prime factorization of n; that is, find your prime numbers p and q. Note that this is the expensive step that Eve would have t..
Write a general set of instructions that will allow us to change any displayed value (from 0 to 9) to any desired value (from 0 to 9) in the least number of steps. For example, if the displayed value is 1 and the desired value is 0,
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