#19 DOM->XSLT-String translators could be made more efficient

[Evan Bottcher]

I did a little investigation because I was concerned
about the performance of the XML translators that are
generated by metaboss - the method of building an
in-memory DOM graph and then transforming with XSLT is
not terribly efficient to my mind and would not scale
to large documents.

I suggest looking at using the SAX API instead - the
transformers could trivially be changed to write to the
SAX ContentHandler interface and then you can
substitute different ContentHandler implementations to
perform different tasks - to generate a DOM graph, or
serialize to a Writer. JAXP also provides a
TransformHandler that allows XSLT implementations to
perform XSL transformation from a SAX event stream.
This is much more efficient even for XSL where the
whole document must be in memory - SAXON XSLT for
example will build a 'tinytree' DOM graph for
transformation which is vastly more efficient for
transforms than a standard Xerces DOM.

Attached is a scratch project consisting of a class
OrderSAXSerializer which shows how to write an STOrder
to a ContentHandler interface. The class also provides
a static toXMLString() method which performs the same
task as TRSTOrder. For comparison I compared 10,000
cycles of serializing to text using the current
generated transformer vs. this class. The results on
my PC are pretty clear:

Run with TRSTOrder

10000 cycles in 42578ms.

Run with OrderSAXSerializer

10000 cycles in 2110ms.

Thought this was worth passing on anyway...

cheers,

Evan.

[Evan Bottcher]

[Rost Vashevnik]

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