I've put together a demo based on one of the sample programs shipped with Xerces. The demo creates a Xerces GrammarPoolImpl then conducts a number of validating XML parses using that grammar pool when caching is enabled for the parser. The test documents include an XML file referring to a DTD and an XML file referring to an XML schema. Each type of parse is done twice in succession to observe the caching behaviour of Xerces, with a new parser instance created for each parse. The parses done include:
DGXMLScanner without caching involving DTD validation
DGXMLScanner with caching involving DTD validation
IGXMLScanner without caching involving DTD validation
IGXMLScanner with caching involving DTD validation
SGXMLScanner without caching involving XML schema validation
SGXMLScanner with caching involving XML schema validation
I ran with on an Fedora Core 1 linux x86 platform using Xerces 2.6.0.
I see a number of surprising things (refer to output below):
- parsing fails when caching is enabled whilst using the DGXMLScanner
- when using DGXMLScanner or IGXMLScanner for DTD validation, the DTD
appears to be re-resolved for each parse. I haven't checked whether
the DTD is actually being re-parsed after being resolved each time, but
I wonder why it is being resolved each time if it is supposedly being
cached
- the DTD is being resolved twice on the first parse when parsing with a
DTD and caching enabled. This seems questionable.
I've attached a tarball containing the files for the demo, which should
work after being unpacked into the samples directory.
Regards,
Daniel
doParse dtdDGXML
parse #1
resolveEntity("", "example.dtd")
parse #2
resolveEntity("", "example.dtd")
----------------------------
doParse dtdDGXMLCaching
parse #1
resolveEntity(null, "example.dtd")
resolveEntity("", "example.dtd")
Fatal Error at (file
/home/daniel/xerces/xerces-c-src_2_6_0/samples/GrammarCache/example-dtd.xml,
line 2, char 40): An exception occurred! Type:NoSuchElementException,
Message:The key '{0}' could not be found in the hash table
parse #2
resolveEntity(null, "example.dtd")
resolveEntity("", "example.dtd")
Fatal Error at (file
/home/daniel/xerces/xerces-c-src_2_6_0/samples/GrammarCache/example-dtd.xml,
line 2, char 40): An exception occurred! Type:NoSuchElementException,
Message:The key '{0}' could not be found in the hash table
----------------------------
doParse dtdIGXML
parse #1
resolveEntity("", "example.dtd")
parse #2
resolveEntity("", "example.dtd")
----------------------------
doParse dtdIGXMLCaching
parse #1
resolveEntity("", "example.dtd")
resolveEntity("", "example.dtd")
parse #2
resolveEntity("", "example.dtd")
----------------------------
doParse xsd
parse #1
resolveEntity("", "example.xsd")
parse #2
resolveEntity("", "example.xsd")
----------------------------
doParse xsdCaching
parse #1
resolveEntity("", "example.xsd")
parse #2
----------------------------
GrammarCache.tar.gz
Description: application/tar-gz
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