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https://issues.apache.org/jira/browse/XERCESC-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Boris Kolpackov updated XERCESC-1607:
-------------------------------------
Affects Version/s: (was: 2.7.0)
(was: 2.5.0)
3.0.1
Fix Version/s: 3.1.0
Assignee: Boris Kolpackov
I am interested in fixing this for 3.1.0. Not sure how yet.
> SAX events not fired when they could be
> ---------------------------------------
>
> Key: XERCESC-1607
> URL: https://issues.apache.org/jira/browse/XERCESC-1607
> Project: Xerces-C++
> Issue Type: Bug
> Components: SAX/SAX2
> Affects Versions: 3.0.1
> Environment: Solaris 2.8, 2.10 SPARC - Sun Studio 11
> Reporter: Gary Hughes
> Assignee: Boris Kolpackov
> Fix For: 3.1.0
>
>
> If a BinInputStream returns a valid fragment of XML that should generate SAX
> parse events it does not necessarily do so before called readBytes again, if
> the BinInputStream blocks on the subsequent read the XML already returned is
> not processed as soon as it could be. This is not a problem when reading a
> file as the XML is eventually processed when EOF is reached however if the
> XML is being streamed across a socket the BinInputStream never reaches EOF
> and the XML is not processed.
> Sample program follows, see the comments in BinInputStream::readBytes, error
> checking etc is largely ignored for brevity.
> #include <xercesc/sax2/SAX2XMLReader.hpp>
> #include <xercesc/sax2/DefaultHandler.hpp>
> #include <xercesc/framework/XMLPScanToken.hpp>
> #include <xercesc/sax2/XMLReaderFactory.hpp>
> #include <xercesc/framework/MemBufInputSource.hpp>
> #include <xercesc/util/XMLUni.hpp>
> #include <iostream>
> #include <algorithm>
> #include <unistd.h>
> class Handler: public XERCES_CPP_NAMESPACE::DefaultHandler
> {
> void warning(const XERCES_CPP_NAMESPACE::SAXParseException& exception)
> {
> std::cout << "WARNING: " <<
> XERCES_CPP_NAMESPACE::XMLString::transcode(exception.getMessage()) <<
> std::endl;
> }
>
> void error(const XERCES_CPP_NAMESPACE::SAXParseException& exception)
> {
> std::cout << "ERROR: " <<
> XERCES_CPP_NAMESPACE::XMLString::transcode(exception.getMessage()) <<
> std::endl;
> }
>
> void fatalError(const XERCES_CPP_NAMESPACE::SAXParseException& exception)
> {
> std::cout << "FATAL ERROR: " <<
> XERCES_CPP_NAMESPACE::XMLString::transcode(exception.getMessage()) <<
> std::endl;
> }
>
> void endElement(const XMLCh* const uri, const XMLCh* const localname,
> const XMLCh* const qname)
> {
> std::cout << "END ELEMENT" << std::endl;
> }
>
> void startDocument()
> {
> std::cout << "START DOCUMENT" << std::endl;
> }
>
> void startElement(const XMLCh* const uri, const XMLCh* const localname,
> const XMLCh* const qname, const XERCES_CPP_NAMESPACE::Attributes& attrs)
> {
> std::cout << "START ELEMENT" << std::endl;
> }
> };
> class BinInputStream : public XERCES_CPP_NAMESPACE::BinInputStream
> {
> public:
> bool getIsOpen() const
> {
> return true;
> }
> unsigned int curPos() const
> {
> return 0;
> }
>
> unsigned int readBytes(XMLByte* const toFill,
> const unsigned int maxToRead)
> {
> //
> // The first time this is called we return some valid XML which
> // should cause the parser to fire events. The second time it is
> // called we sleep to simulate a blocking read.
> //
> // Even though the parser has a valid chunk of XML it does not
> // fire any events other than start document.
> //
> // If the sleep is removed the parser gets EOF and fires the
> // events as expected.
> //
> static size_t callCount = 0;
>
> if(callCount > 0)
> {
> sleep(10000);
> return 0;
> }
>
> ++callCount;
>
> std::string xml
> (
> "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>"
> "<document>"
> " <element/>"
> "</document>"
> );
>
> std::copy(xml.begin(),
> xml.end(),
> toFill);
>
> return xml.size();
> }
> };
> class InputSource : public XERCES_CPP_NAMESPACE::InputSource
> {
> public:
> virtual XERCES_CPP_NAMESPACE::BinInputStream* makeStream() const
> {
> return new BinInputStream;
> }
> };
> int main(int argc, char** argv)
> {
> XERCES_CPP_NAMESPACE::XMLPlatformUtils::Initialize();
> XERCES_CPP_NAMESPACE::SAX2XMLReader* reader =
> XERCES_CPP_NAMESPACE::XMLReaderFactory::createXMLReader();
> Handler* handler = new Handler;
> reader->setContentHandler(handler);
> reader->setErrorHandler(handler);
>
> XERCES_CPP_NAMESPACE::XMLPScanToken scanToken;
> InputSource* inputSource = new InputSource;
>
> if(!reader->parseFirst(*inputSource, scanToken))
> return 1;
>
> while(reader->parseNext(scanToken));
>
> return 0;
> }
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