<br><font size=2 face="sans-serif">how can I find amount of memory Java
uses for JDOM tree?</font>
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<br><font size=2 face="sans-serif">and how can I serialize it?</font>
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<td width=40%><font size=1 face="sans-serif"><b>Tatu Saloranta <cowtowncoder@yahoo.com></b>
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<br><font size=1 face="sans-serif">Sent by: jdom-interest-bounces@jdom.org</font>
<p><font size=1 face="sans-serif">01/18/2008 12:51 PM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">jdom interest <jdom-interest@jdom.org></font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [jdom-interest] How to find document
size</font></table>
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<br><font size=2><tt><br>
--- Jasmin_Mehta@nexweb.org wrote:<br>
<br>
> I need to know the xml document size as it is when<br>
> it comes out from <br>
> Oracle's 'XMLTYPE' datatype. I am appending<br>
> resultset records one after <br>
> another in one xml document until it reaches certain<br>
> size. For this <br>
> purpose I need to know the size of <br>
<br>
There is no efficient way to get exact size; either<br>
for serialized or amount of memory Java uses for the<br>
JDOM tree. To know exact size, you have to serialize<br>
it: and even when using dummy OutputStream there's<br>
linear cost for doing that, and with incremental<br>
calls, it has N^2 complexity (essentially dog slow for<br>
sizable docs).<br>
<br>
But you can approximate size yourself; this would give<br>
rough idea of either serialized size or amount of<br>
memory used to store the JDOM tree in memory (latter<br>
which is usually 3x - 4x of the former, depending on<br>
kind of document).<br>
<br>
The main question is what is this to be used for?<br>
To avoid getting a DB exception from Oracle (there's a<br>
max size for column), to avoid Denial-of-service<br>
attack (memory used on server side for processing doc)<br>
or something else?<br>
As long as approximate size is enough (size that's<br>
within, say, 2x of the actual size) it should be<br>
doable quite efficiently.<br>
<br>
-+ Tatu +-<br>
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