Improve performance in XSLTMediator when temporary files are used
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Key: SYNAPSE-211
URL: https://issues.apache.org/jira/browse/SYNAPSE-211
Project: Synapse
Issue Type: Improvement
Components: Core
Affects Versions: 1.1, NIGHTLY
Reporter: Andreas Veithen
Priority: Minor
The XSLT mediator has a mechanism to stream the result of the transformation to
a temporary file when its size exceeds some threshold (defined by
BYTE_ARRAY_SIZE, which has a fixed value of 8192). However, when this happens,
the transformation is actually triggered twice. During the first run, the
result is sent to a FixedByteArrayOutputStream which will raise a
SynapseException after the first 8192 bytes have been written. The
transformation is then restarted using a FileOutputStream for the result. This
is very bad for two reasons:
* It introduced an overhead (the first attempt to execute the transformation)
for every large XML that is processed.
* It makes the choice of the threshold BYTE_ARRAY_SIZE difficult: a small value
is bad for smaller XML documents (because temporary files are used where this
is not necessary) but good for larger ones (because it reduces the overhead
caused by the first transformation attempt); a large value is good for smaller
XML documents (avoids temporary files) but bad for larger ones (increased
overhead for the first transformation).
A better approach would be to have an OutputStream implementation that will
first write to a byte array and once the threshold is exceeded transparently
switches to a temporary file, so that the transformation is always run only
once.
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