[Exist-open] More XQuery functions, configuration, caching

[Wolfgang M. <me...@if...>]

Hi,

I just checked in my recent changes, which add support for some more 
XQuery/XPath functions, for example, fn:matches, fn:tokenize, fn:exists...

Due to the updated Cocoon, several new problems with xalan, xerces and Cocoon 
showed up and I tried to fix these.

Also, all dependencies on the fastutil library have been removed. fastutil 
provided hashtables and trees for native Java types. Unfortunately, fastutil 
was distributed in one, very large jar and used the C pre-processor to 
generate type specific code. Thanks to the help of my collegue, Stephan, we 
have been able to replace fastutil by our own simple hashtable package. The 
database may use some hashtables many thousand times a second, so having 
control over memory consumption, object removal and the like is quite 
important.

Finally, the database now automatically determines default buffer sizes for 
each of the internal caches, so specifying buffer sizes in conf.xml is no 
longer necessary. Instead, you just define the maximum (raw) amount of memory 
to be shared by all caches. A typical entry thus looks like this:

<db-connection database="native" files="webapp/WEB-INF/data"
	pageSize="4096" cacheSize="64M" free_mem_min="10">

cacheSize specifies the maximum raw amount of memory used if all caches are 
full (which is quite unlikely for most applications). However, the 
calculation assumes that each page consumes pageSize bytes. In reality, you 
have to add some bytes for Java object instance fields and things like that.

As before, it is still possible to specify larger buffer sizes for selected 
caches, for example, to enlarge the cache for the fulltext index.

There's also a new snapshot release, available at

http://prdownloads.sourceforge.net/exist/eXist-snapshot-031125.zip?download

Best regards,

Wolfgang

-- 
Wolfgang Meier
Darmstadt University of Technology
Tel.: +49 (0) 06151 16 4458
ICQ: #296595621
http://exist-db.org
http://www.sozionet.org