Steve Lawrence created DAFFODIL-2575:
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Summary: dfdlx:trace function should not write directly to stderr
Key: DAFFODIL-2575
URL: https://issues.apache.org/jira/browse/DAFFODIL-2575
Project: Daffodil
Issue Type: Bug
Components: Back End
Reporter: Steve Lawrence
There's little restrictions about what the {{dfdlx:trace}} function should do.
The fn:trace function, which this is based on, says:
bq. In addition, the values of $value, converted to an xs:string, and $label
(if supplied) may be directed to a trace data set. The destination of the trace
output is ·implementation-defined·. The format of the trace output is
·implementation-dependent·. The ordering of output from calls of the fn:trace
function is ·implementation-dependent·.
bq.
So we have output trace data however we think makes the most sense.
We currently output to stderr, but that could be difficult for some users of
Daffodil (e.g. debugger, API users, etc.) to capture. Instead, we should just
log the data using our logger. Since our logging uses the Log4J API, it should
be relatively easy for tools to capture and display trace information.
Note that CLI logging goes to stderr by default, so this is functionally no
change for the CLI, except maybe with an added [info] or [debug] tag depending
on what level we decide trace should be log to.
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