Re: Logging Question

From:
Tom Anderson <twic@urchin.earth.li>
Newsgroups:
comp.lang.java.programmer
Date:
Wed, 4 Jan 2012 14:42:17 +0000
Message-ID:
<alpine.DEB.2.00.1201041440320.2163@urchin.earth.li>
On Tue, 3 Jan 2012, Jeff Higgins wrote:

On 01/03/2012 10:33 AM, Tom Anderson wrote:

On Sun, 1 Jan 2012, Arved Sandstrom wrote:

On 01/01/2012 06:33 AM, Stefan Ram wrote:

But an XML file needs to have one single root element that has an
end tag at its end. A process that is being terminated abnormally
might not write such an end tag.


And let's face it, the <log> document element in this case is useless.
It conveys zero information. It would better to regard each record as
a separate well-formed XML document, and the file is merely physical
storage for a bunch of log records.


What happens if you throw such a file into a normal XML parser?

I would imagine that if you're using StAX, you can stop parsing when
you hit the end of a root element, and then either carry on to the next
one, or perhaps wrap a fresh parser round the underlying input stream.

I have no idea what a SAX parser would do; i don't know how much
well-formedness checking they do.

What would a DOM parser do?

You might need to interpolate a layer between the parser and the
FileInputStream to notionally split the file into substreams, one per
document. That would require some sort of framing format for the file,
i think.


The java.util.logging.XMLFormatter follows the DTD described in the
Appendix.* You are free to write a formatter that follows your own DTD.


No, i was talking about Arved's idea of putting multiple XML documents in
a single file. Did you read and understand Arved's post?

tom

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