Prevalence: Transparent, Fault-Tolerant Object Persistence


	Prevalence: Transparent, Fault-Tolerant Object Persistence

ccharlebois

7-10-2008 7:02 PM

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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/ba4fec97-ec4a-4502-af66-f46a024d7587/ECE4D796-69E5-4552-AF7D-40C21F36C7D0/" 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.onjava.com/pub/a/onjava/2005/06/08/prevayler.html" href="http://www.onjava.com/pub/a/onjava/2005/06/08/prevayler.html" style="font-size: 11px;">www.onjava.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.onjava.com/pub/a/onjava/2005/06/08/prevayler.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.onjava.com/img/ED358823-21AD-4EDC-B380-D69239944FFF" alt="ONJava.com -- The Independent Source for Enterprise Java" /></div></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.onjava.com/pub/a/onjava/2005/06/08/prevayler.html"><H2>
Prevalence: Transparent, Fault-Tolerant Object Persistence</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.onjava.com/pub/a/onjava/2005/06/08/prevayler.html"><P>In fact, Java already has a well-established, built-in
persistence mechanism in the form of 
<A href="http://java.sun.com/docs/books/tutorial/essential/io/serialization.html">serialization</A>.
However, serialization is limited in terms of ability to query specific
data, and, crucially, in its lack of fault tolerance. The first
problem is not an issue if the entire data set for an application
can be held in memory--and querying an in-memory data set will
usually be faster than a database query. However, this is not of much
use if the system experiences a failure while running--the state
of the data on restart will be the last serialized data set, and
any changes to the data since then will be lost.</P></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.onjava.com/pub/a/onjava/2005/06/08/prevayler.html"><H3>Tools for Creating a Prevalent System</H3></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.onjava.com/pub/a/onjava/2005/06/08/prevayler.html"><H3>The Component Parts of the System</H3></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.onjava.com/pub/a/onjava/2005/06/08/prevayler.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.onjava.com/img/06017E57-11A1-400A-AC12-674028B0D384" alt="Business classes" /></div></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/ECE4D796-69E5-4552-AF7D-40C21F36C7D0/blog/" title="blog or email this clip"><img src="http://content7.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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