CSC/ECE 517 Summer 2008/wiki3 6 esb: Difference between revisions
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==Protected Variation== | ==Protected Variation== | ||
Description of protected variation | Description of protected variation | ||
Chapter 25 pp 427-433 -- Protected variation and Polymorphism | |||
Protected Variation and Polymorphism seem related. What is the difference | |||
between the two? Where would you apply one pattern over the other? | |||
Polymorphism is a powerful technology that is very useful for | |||
handling Protected Variation. Protected Variation gives one reason "why" | |||
for a particular use of Polymorphism. | |||
See next... | |||
. Chapter 25.4 pp 434 -- OCP | |||
An example of an | |||
.Key Open-Closed Principle | |||
is... X can be opened to Y and always Z. And it's only open to Y if it Y | |||
needs to access something and has permission to. While Z can always access | |||
it because it has permission to. | |||
That look right? | |||
I'd express it like this: if X uses Y in some way or other you don't want | |||
changes to Y to effect X, but you also want to be able to change Y in ways | |||
that don't change X. | |||
== Introduction == | == Introduction == | ||
Revision as of 18:29, 24 July 2008
Protected Variation
Description of protected variation
Chapter 25 pp 427-433 -- Protected variation and Polymorphism Protected Variation and Polymorphism seem related. What is the difference between the two? Where would you apply one pattern over the other?
Polymorphism is a powerful technology that is very useful for handling Protected Variation. Protected Variation gives one reason "why" for a particular use of Polymorphism.
See next... . Chapter 25.4 pp 434 -- OCP An example of an .Key Open-Closed Principle is... X can be opened to Y and always Z. And it's only open to Y if it Y needs to access something and has permission to. While Z can always access it because it has permission to. That look right?
I'd express it like this: if X uses Y in some way or other you don't want changes to Y to effect X, but you also want to be able to change Y in ways that don't change X.
Introduction
Keep information out of the grasp of components that could damage integrity. Introduce reader to protected variation -Open/Closed Principle and Information Hiding
Why use Protected Variation?
General overview
- Example 1
- Example 2
How would you classify it
Coding Examples
Conclusion
See Also
External links
http://codecourse.sourceforge.net/materials/The-Importance-of-Being-Closed.pdf
http://www.rgoarchitects.com/Files/ooprimer.ppt#288,9,OCP Example