6.1: Outline the different types of messaging and define a scenario where each would be useful.

6.2: Extend the extension framework such that when a calculation is executed a message "Come back later" is returned. Also add to the extension a message "More data later." Neither message needs to be text based; both could be numerical. The objective is to be able to call an extension, get a message, and then come back to that session. Note the use of the word "session," which is a hint on how to solve the problem.

6.3: Implement the asynchronous messages using the Publish and Subscribe framework. Add an operation of your choosing that would ideally illustrate an asynchronous calculation.

6.4: Modify the calculator and associated extensions to use the stack principle of the HP calculator called HP Reverse Polish Notation (RPN). Hint: use the Command best practice and remember to clean up the entire calculator component (e.g., history, etc.).

Applied Software Engineering Using Apache Jakarta Commons
Applied Software Engineering Using Apache Jakarta Commons (Charles River Media Computer Engineering)
ISBN: 1584502460
EAN: 2147483647
Year: 2002
Pages: 109 © 2008-2017.
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