[ http://issues.apache.org/jira/browse/TUSCANY-990?page=all ]
Yang ZHONG updated TUSCANY-990:
-------------------------------
Attachment: AvoidInfiniteLoading.990
The attached prototype has adopted
3-3. Currently ParserErrorSetter is explicitly passed into each parser, which
can host the LoadingContext/ResourceSet
to minimize source changes.
> Avoid duplicated/infinite loading
> ---------------------------------
>
> Key: TUSCANY-990
> URL: http://issues.apache.org/jira/browse/TUSCANY-990
> Project: Tuscany
> Issue Type: Improvement
> Components: C++ SDO
> Affects Versions: Cpp-current
> Reporter: Yang ZHONG
> Attachments: AvoidInfiniteLoading.990
>
>
> While working on http://issues.apache.org/jira/browse/TUSCANY-907
> I've observed duplicated XSD loading. It could be infinite loading. I might
> have a way to avoid that.
> http://pecl.php.net/bugs/bug.php?id=9243
> has the Test Case:
> 1. http://ping.chip.org/phr/xml/insurance.xsd imports
> http://ping.chip.org/phr/xml/types.xsd
> 2. http://ping.chip.org/phr/xml/insurance.xsd imports
> http://ping.chip.org/phr/xml/contact.xsd which also imports
> http://ping.chip.org/phr/xml/types.xsd
> I've observed http://ping.chip.org/phr/xml/types.xsd is loaded/parsed
> multiple times during loading http://ping.chip.org/phr/xml/insurance.xsd
> That impacts performance, especially types.xsd is remote.
> More deadly, that may cause infinite loading or stack overflow.
> Imagine A imports B which imports A, or X imports Y which imports Z which
> imports X.
> We can have a LoadingContext/ResourceSet to cache loaded/parsed resources,
> and reuse parsing results if a location/URI has been loaded/parsed already.
> 3-1. The LoadingContext/ResourceSet can be a Thread Local
> 3-2. The LoadingContext/ResourceSet can be explicitly passed into each parser
> 3-3. Currently ParserErrorSetter is explicitly passed into each parser, which
> can host the LoadingContext/ResourceSet
> Above has been discussed on thread
> http://www.mail-archive.com/tuscany-dev%40ws.apache.org/msg11793.html
> and Caroline has also requested this improvement
> (http://www.mail-archive.com/tuscany-dev%40ws.apache.org/msg11839.html)
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