This lecture was an Introduction to Patterns
How I have understood Patterns
Patterns can be seen as a templates that can be used to solve a specific problem that occurs over and over again in a given context or set of circumstances.
The use of patterns offers tested and proven development paradigms good quality results. In other words and a tested and proven solution to that problem is applied, the resulting solution of good quality since the solution has successfully been used over and over again to solve a specific problem.
Below are the components that make up a pattern.
- Problem
- Context
- Motivation (force)
- Solution
- Examples
- Related patterns
- Known uses
- Pattern name
Benefit of using Patterns
The use of pattern speeds up the development process by providing tested and proven development paradigms. Developer therefore spend less time on developing test cases as they are sure that the product will work as expected, since it has been built following a well tested and proved method. However, this is no justification of not developing thorough a test case.
Patterns also reduce the need to redesign a solution to a specific problem. Whenever a problem arises, the already tested and proven solution (pattern) can a apply to it without wasting much time rethinking of a solution
Since patterns provide reusable solutions, they help to reduce costs involved in developing a product or getting solutions to a problem. Few consultants on a project for example may be reduced as provide expertise in solving a specific problem.
Where patterns are well documented/ catalogued, they are useful in passing knowledge from experts to novice.
I have discovered my own pattern!!!!
After the lesson I was able to develop my own pattern to solve. I am currently doing a project in Flash lite 2.0; for the time I have working with Flash Lite 2.0 I have discovered the pattern below.
Pattern name: Flash lite 2.0 tween pattern
Problems:
How do I develop movie player (with play, stop, forward and backward functions) in Flash lite 2.0 without having to study Actionscript 2.0?
Context:
Am developing a movie player in Flash lite 2.0, Among other modules in the application, the User interface module has the following functionalities: Play functions, Stop, Forward, and Backward. ActionScription 2.0 is used to develop these functionalities. I am not a good Actionscript 2.0 programmer and have limited time to ActionScript 2.0.
Solution:
Place each function (play, stop, forward and backward) in a separate frame on stage and tween all the frame.
References:
http://members.cox.net/risingl1/articles/expertise.htm
Linda Rising
Patterns: A way to reuse expertise
Accessed: 6th February 2007
http://www.tech.port.ac.uk/staffweb/chandlej/patterns/patterns.htm#Using%20a%20Design
Jane Chandler and Steve Hand (20th March 1998)
Introduction to Patterns
Accessed: 6 February 2007
Design Patterns
http://www.dofactory.com/Patterns/Patterns.aspx
Accessed: 6th February 2007
Design Pattern (Computer Science)
http://en.wikipedia.org/wiki/Design_pattern_(computer_science)#Uses
Accessed:6th February 2007
4 comments:
Hi
Good job on explaining what a paatern is. with regards to your pattern you created, i think your solution to the problem in the context is not clear, i dont see the convincing element there to accept it as a pattern or even use it.
cheers
Hi Marville, thanks for the highlight. To be honest its a "pattern" I was trying to discover. But as you may know it has not been tested and proven just the for example the GOFs pattern. In future I think I will refine it into a standard pattern. Actually we could do a project on this. What do you think?
Thanks
your work gives a challenge especially with the way you organize it. i hope you keep it up
HI
You did a good job trying to discover a pattern but in my opinion a pattern must provide a good solution that can be used over and over again but your solution to problem doesnot seem to be good so that others can use it.
Navaraj
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