<pedrocorreia.net ⁄>
 

<Creating custom sorting types for Apache Cassandra ⁄ >




clicks: 3264 3264 2010-04-06 2010-04-06 goto programacao myNews programacao  Bookmark This Bookmark This


In part three of Installing and using Apache Cassandra With Java we already talked about sorting and the various sorting types that are available by default. this time we are going to have a look as to what is needed to create your very own sorting type. In this example we will create a sorting type which will sort the data as if they are dates. Now to clarify already, i use the european notation style (dd-MM-yyyy) so don't get confused by that.

Also what is very important to know, the sorting types are used when you are storing data (i mentioned this in part three), however, the sorting types are also used when you are using the get_slice method of the Cassandra Client.

As i mentioned in part three Cassandra provides us with an abstract class org.apache.cassandra.db.marshal.AbstractType which we must extend to define our sorting behavior. When we extend this class we need to provide two methods, first is the getString(byte[] bytes) method, this method is actually not that important, it is used by Cassandra so that it can display logging information with the actual data at hand. Another method that needs to be implemented is the compare(byte[] value1, byte[] value2) method of the Comparator interface.



este é só um excerto do artigo, para aceder ao artigo completo, clique no link em baixo:
this is just a small excerpt from the article, to access the full article please click in the link below:

http://www.sodeso.nl/?p=421




Subscribe News RSS  Subscribe News Updates by E-mail





myNews <myNews show="rand" cat="programacao" ⁄>

RouterJs: easy routing for your ajax Web applications new ...

RouterJs is a simple router for your ajax web apps. It's build upon History.js which means that Rout (...)

clicks: 17311 17311 2012-05-14 2012-05-14 goto url (new window) haithembelhaj.g... goto myNews programacao


Backbone computed properties new ...

This gist shows one way to implement read- and write-enabled computed properties on a Backbone Model (...)

clicks: 17094 17094 2012-05-13 2012-05-13 goto url (new window) https://gist.gi... goto myNews programacao


Android Query new ...

Android-Query (AQuery) is a light-weight library for doing asynchronous tasks and manipulating UI el (...)

clicks: 17215 17215 2012-05-12 2012-05-12 goto url (new window) code.google.com... goto myNews programacao


Create Instagram Filters With PHP new ...

In this tutorial, I'll demonstrate how to create vintage (just like Instagram does) photos with PHP (...)

clicks: 16979 16979 2012-05-12 2012-05-12 goto url (new window) net.tutsplus.co... goto myNews programacao


HTML5 jQuery Paint Plugin new ...

Websanova Paint is a HTML5 canvas based jQuery plugin. It allows you to free paint on a canvas area (...)

clicks: 28064 28064 2012-05-12 2012-05-12 goto url (new window) websanova.com/t... goto myNews programacao


Real-time Applications With Node.js and Socket.IO new ...

Hey everyone! Sorry about the long pause since the last blog post, life has been quite hectic for th (...)

clicks: 17348 17348 2012-05-11 2012-05-11 goto url (new window) codingcookies.c... goto myNews programacao


Sass vs. LESS vs. Stylus: Preprocessor Shootout new ...

CSS3 preprocessors are languages written for the sole purpose of adding cool, inventive features to (...)

clicks: 16688 16688 2012-05-11 2012-05-11 goto url (new window) net.tutsplus.co... goto myNews programacao


15 Handpicked jQuery Drop Down Menus Tutorials new ...

Here we are presenting another brilliant collection of 15 jQuery navigation menu that you can downlo (...)

clicks: 16118 16118 2012-05-10 2012-05-10 goto url (new window) smashingapps.co... goto myNews programacao