[jira] Commented: (XERCESC-1589) XML DOM parser does not release memory on parser:release and resetDocumentPool()

["Rinil Baxi (JIRA)" <xe...@xml.apache.org>]

    [ http://issues.apache.org/jira/browse/XERCESC-1589?page=comments#action_12414055 ] 

Rinil Baxi commented on XERCESC-1589:
-------------------------------------

Hi,

I am using Xercesc Parser 2.4.0.
The problem (XERCESC-1260 : Memory not released with DOMBuilder::parse() method) persists with the version I am using.
Please guide me,  How I can resolve this problem in 2.4.0.

I am not able to use the latest versions due to some production problems.

Kindly reply as soon as possible.

Thanks and Best Regards,
Rinil

> XML DOM parser does not release memory on parser:release and resetDocumentPool()
> --------------------------------------------------------------------------------
>
>          Key: XERCESC-1589
>          URL: http://issues.apache.org/jira/browse/XERCESC-1589
>      Project: Xerces-C++
>         Type: Bug

>   Components: DOM
>     Versions: 2.4.0
>  Environment: HP-Tandem-NonStop Kernel
>     Reporter: Rinil Baxi

>
> 1) Use the following code:
> /home/Rinil/Xml/dom [2441]: more mleak.cpp
> #include < string.h>
> #include < cextdecs.h>
> #include < iostream>
> #include < xercesc/util/PlatformUtils.hpp>
> #include < xercesc/parsers/AbstractDOMParser.hpp>
> #include < xercesc/dom/DOMImplementation.hpp>
> #include < xercesc/dom/DOMImplementationLS.hpp>
> #include < xercesc/dom/DOMImplementationRegistry.hpp>
> #include < xercesc/dom/DOMBuilder.hpp>
> #include < xercesc/dom/DOMException.hpp>
> #include < xercesc/dom/DOMDocument.hpp>
> #include < xercesc/dom/DOMNodeList.hpp>
> #include < xercesc/dom/DOMError.hpp>
> #include < xercesc/dom/DOMLocator.hpp>
> #include < xercesc/dom/DOMWriter.hpp>
> #include < xercesc/framework/StdOutFormatTarget.hpp>
> #include < xercesc/framework/LocalFileFormatTarget.hpp>
> #include < xercesc/framework/MemBufInputSource.hpp>
> #include < xercesc/framework/Wrapper4InputSource.hpp>
> #include < xercesc/parsers/XercesDOMParser.hpp>
> #include < xercesc/util/XMLUni.hpp>
> #include < xercesc/util/XMLException.hpp>
> unsigned long getMemUsage ()
> {
>  short gError = 0;
>  short myHandle[10];
>  short attrList[10];
>  short valList[10];
>  short valMaxLen = 10;
>  short valLen = 0;
>  short attrs = 0;
>  unsigned long *memUsage;
>  gError = PROCESSHANDLE_GETMINE_ (&myHandle[0]);
>  if (gError)
>   return 0;35%)
>  memset (&attrList[0], '\0', 10);
>  memset (&valList[0], '\0', 10);
>  attrList[attrs] = 111;
>  attrs++;
>  gError = PROCESS_GETINFOLIST_
>   (,,,,&myHandle[0]
>   ,&attrList[0]
>   ,attrs
>   ,&valList[0]
>   ,valMaxLen
>   ,&valLen
>   );
>  if (gError)
>   return 0;
>  memUsage = (unsigned long *) (&valList[0]);
>  return *memUsage;
> }
> int main()
> {
>  DOMImplementation *impl;
>  DOMBuilder *parser;
>  DOMDocument *doc;
>  const XMLCh gLS[] = { chLatin_L, chLatin_S, chNull };
>  std::cout < < "\nMEMUSAGE at Start : "< < getMemUsage();
>  // Initialize the XML system
>  try {
>         XMLPlatformUtils::Initialize();
>         XMLPlatformUtils::recognizeNEL(false);
>   }
>  catch (const XMLException& toCatch) {
>           return 1;
>  }
>  impl = DOMImplementationRegistry::getDOMImplementation(gLS);
>  parser = ((DOMImplementationLS*)impl)->createDOMBuilder(DOMImplementationLS::MODE_SYNCHRONOUS, 0);
>  if (parser == NULL) {
>   //Its known that XML system must be terminated before returning
>   return 1;
>  }
>  parser->setFeature(XMLUni::fgDOMNamespaces,true);
>  parser->setFeature(XMLUni::fgXercesSchema, false);
>  parser->setFeature(XMLUni::fgXercesSchemaFullChecking, false);
>  parser->setFeature(XMLUni::fgDOMValidateIfSchema, false);
>  parser->setFeature(XMLUni::fgDOMDatatypeNormalization, true);
>  //Reset Document Pool
>  parser->resetDocumentPool();
>  std::cout< < "\nMEMUSAGE before parsing: "< < getMemUsage();
>  //Parse XML and get document
>  try{
>   doc = parser->parseURI("personal.xml");
>  }
>  catch(DOMException dome){
>   //Its known that XML system must be terminated before returning
>   return 1;
>  }
>  std::cout< < "\nMEMUSAGE after parsing: "< < getMemUsage();
>  //Reset Document Pool
>  parser->resetDocumentPool();
>  std::cout< < "\nMEMUSAGE after resetDocumentpool(): "< < getMemUsage();
>  //Release Parser
>  //This should also release DOMDOcument associated i.e. doc
>  parser->release();
>  std::cout< < "\nMEMUSAGE after parser release(): "< < getMemUsage();
>  XMLPlatformUtils::Terminate();
>  std::cout< < "\nMEMUSAGE after Terminate(): "< < getMemUsage()< < std::endl;
>  return 0;
> }
> /home/Rinil/xml/dom [2442]:
> 2) Compile using Makefiles provided with XML samples.
> 3) Place a xml file to be parsed in the CWD. ie personal.xml which comes with
> the samples.
> 4) run mleak:
> /home/RinilXml/dom [2452]: ./mleak
> MEMUSAGE at Start : 16384
> MEMUSAGE before parsing: 57344
> MEMUSAGE after parsing: 245888
> MEMUSAGE after resetDocumentpool(): 245888
> MEMUSAGE after parser release(): 245888
> MEMUSAGE after Terminate(): 245888

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