Ted Leung on the air
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Wed, 04 Feb 2004
Chandler happenings
Here's a few items from the Chandler repository that might be of interest. (There's lots happening in the CPIA and applications area as well, but I don't want to spoil their fun...)
  • BerkeleyDB store for Lucene
  • It looks like we are going to use a native compiled (gcj) version of Lucene to do free text searching in Chandler. In order to do this, we needed to adapt Lucene to use a BerkeleyDB database as a store. Andi wrote this code and it's been contributed back to the Lucene project, which has taken the code into the Lucene sandbox. There's also the Python layer that exposes the Lucene functionality to Python. People have wondered why we didn't just use Lupy. The problem with Lupy is that it doesn't perform as well as Lucene, and it's basically a port.
  • Busy Developer's Guide to the Chandler Repository
  • This document is supposed to help people get started using the repository. If you read it and it doesn't help you, let us know.
  • Proposal for Chandler Query System
  • This proposal is the start of our query facility, which will probably be consuming my working life for the next few months. If your interested in this sort of thing, now is the time to drop in and make your opinions known. We got some really good feedback in today's IRC, so don't be shy. I'm not only looking for feedback, but I'm also interested in finding people who'd like to work on building this. So please stop by dev@osafoundation.org or irc://irc.osafoundation.org:6667/chandler and say hi.
[17:13] | [computers/open_source/osaf/chandler] | # | TB | F | G | 14 Comments | Other blogs commenting on this post

wbem (web based enterprisemanagement) http://www.dmtf.org/home implemented in windows as wmi, there are a couple of open source wbem implementations out there: I prefer the following

among the various things that wbem gives you is a unified way of querying what services a program provides, as well as registering for events from that program
Note: under wmi one has WQL, an sql syntax, which is how your busy developer's guide brought it to mind:


All Microsoft Office tools currently have a wmi provider as far as I'm aware, eases the life of administrators no end. Exchange has all sorts of nifty wmi stuff going for it.

The path syntax:

the path //userdata/roots/email/inbox looks like an xpath, I suppose it probably is, but a simplified one. Then you move to the sql-like syntax: FOR i IN inbox WHERE "Foo" in i.Projects

I'll have to wait till the weekend to read the spec though, but I was wondering if the SQL-Like syntax could be combined into the path syntax. If indeed it were a full xpath then it would be possible to do as complex queries.
Posted by bryan at Thu Feb 5 11:16:29 2004

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