Design Principles | Clipmarks


	Design Principles

travislaborde

3-28-2008 7:25 AM

228 views

tags:

programming

travislaborde says:

I "get it" with most of these, but... I've never been able to really wrap my head around the "Open/Closed Principle."

Anyone care to give their explanation of this one?

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/c4636c29-0020-4ac0-8251-b8af30ba1640/3AD5F5FD-C09F-4372-9903-C0534A7CA3E8/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.oodesign.com/design-principles.html" href="http://www.oodesign.com/design-principles.html" style="font-size: 11px;">www.oodesign.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.oodesign.com/design-principles.html"><H1>Design Principles</H1></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.oodesign.com/design-principles.html"><H2>What are Software Design Principles?</H2>
<P>Software design principles represent a set of guidelines that helps us to avoid having a bad design. The design principles are associated to Robert Martin who gathered them in "Agile Software Development: Principles, Patterns, and Practices". According to Robert Martin there are 3 important characteristics of a bad design that should be avoided:</P><P>
</P><UL>
<li style="margin-left:16px;padding-left: 0px;">Rigidity - It is hard to change because every change affects too many other parts of the system.</LI>
<li style="margin-left:16px;padding-left: 0px;">Fragility - When you make a change, unexpected parts of the system break.</LI>
<li style="margin-left:16px;padding-left: 0px;">Immobility - It is hard to reuse in another application because it cannot be disentangled from the current application.</LI></UL></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.oodesign.com/design-principles.html"><H2><A href="http://www.oodesign.com/open-close-principle.html">Open Close Principle</A></H2></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.oodesign.com/design-principles.html"><H2><A href="http://www.oodesign.com/dependency-inversion-principle.html">Dependency Inversion Principle</A></H2></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.oodesign.com/design-principles.html"><H2><A href="http://www.oodesign.com/interface-segregation-principle.html">Interface Segregation Principle</A></H2></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.oodesign.com/design-principles.html"><H2><A href="http://www.oodesign.com/single-responsibility-principle.html">Single Responsibility Principle</A></H2></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.oodesign.com/design-principles.html"><H2><A href="http://www.oodesign.com/liskov-s-substitution-principle.html">Liskov's Substitution Principle</A></H2></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/3AD5F5FD-C09F-4372-9903-C0534A7CA3E8/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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