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xml-copy-editor-code
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Fixed multi-thread problems with LibXML and Xerces-C++

This commit is contained in:
Zane U. Ji 2012-08-15 20:45:24 +08:00
parent 3caf99e454
commit 47dbfafd71
9 changed files with 175 additions and 154 deletions
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76
src/validationthread.cpp
View File

@ -5,31 +5,28 @@
#include <stdexcept>
#include <memory>
wxDEFINE_EVENT(wxEVT_COMMAND_VALIDATION_COMPLETED, wxThreadEvent);
ValidationThread::ValidationThread (
wxEvtHandler *handler,
const char *buffer,
const char *system,
const char *catalogPath,
const char *catalogUtilityPath,
bool *finished,
bool *success,
bool *release,
std::pair<int, int> *position,
wxString *message ) : wxThread()
const char *catalogUtilityPath )
: wxThread ( wxTHREAD_JOINABLE )
{
if (!buffer || !success || !position || !message )
if ( buffer == NULL )
{
throw;
}
myEventHandler = handler;
myBuffer = buffer;
mySystem = system;
myCatalogPath = catalogPath;
myCatalogUtilityPath = catalogUtilityPath;
myFinishedPtr = finished;
mySuccessPtr = success;
myReleasePtr = release;
myPositionPtr = position;
myMessagePtr = message;
myIsSucceeded = false;
}
void *ValidationThread::Entry()
@ -40,47 +37,38 @@ void *ValidationThread::Entry()
{
//wxCriticalSectionLocker locker ( xmlcopyeditorCriticalSection );
if ( *myReleasePtr || TestDestroy() )
if ( TestDestroy() )
{
Exit();
return NULL;
}
}
bool res = validator->validateMemory (
myIsSucceeded = validator->validateMemory (
myBuffer.c_str(),
mySystem.c_str(),
myBuffer.size() );
{
//wxCriticalSectionLocker locker ( xmlcopyeditorCriticalSection );
if ( *myReleasePtr || TestDestroy() )
{
Exit();
return NULL;
}
if ( !res )
{
*mySuccessPtr = res;
*myPositionPtr = validator->getErrorPosition();
*myMessagePtr = validator->getLastError();
}
else
{
*mySuccessPtr = true;
*myPositionPtr = std::make_pair ( 0, 0 );
*myMessagePtr = wxEmptyString;
}
if ( TestDestroy() )
{
return NULL;
}
extern wxCriticalSection xmlcopyeditorCriticalSection;
wxCriticalSectionLocker locker ( xmlcopyeditorCriticalSection );
if ( myIsSucceeded )
{
myPosition = std::make_pair ( 0, 0 );
myMessage = wxEmptyString;
}
else
{
myPosition = validator->getErrorPosition();
myMessage = validator->getLastError();
}
wxEvent *event = new wxThreadEvent(wxEVT_THREAD, wxEVT_COMMAND_VALIDATION_COMPLETED);
wxQueueEvent ( myEventHandler, event );
return NULL;
}
void ValidationThread::OnExit()
{
{
//wxCriticalSectionLocker locker ( xmlcopyeditorCriticalSection );
if ( *myReleasePtr )
return;
*myFinishedPtr = true;
}
}

27
src/validationthread.h
View File

@ -6,25 +6,28 @@
#include <string>
#include <wx/thread.h>
wxDECLARE_EVENT(wxEVT_COMMAND_VALIDATION_COMPLETED, wxThreadEvent);
class ValidationThread : public wxThread
{
public:
ValidationThread (
const char *buffer,
const char *system,
const char *catalogPath,
const char *catalogUtilityPath,
bool *finished,
bool *success,
bool *release, std::pair<int, int> *position,
wxString *message );
wxEvtHandler *handler,
const char *buffer,
const char *system,
const char *catalogPath,
const char *catalogUtilityPath );
virtual void *Entry();
virtual void OnExit();
void setBuffer ( const char *buffer, const char *system );
bool isSucceeded () { return myIsSucceeded; }
const std::pair<int, int> &getPosition() { return myPosition; }
const wxString &getMessage() { return myMessage; }
private:
wxEvtHandler *myEventHandler;
std::string myBuffer, mySystem, myCatalogPath, myCatalogUtilityPath;
bool *myFinishedPtr, *mySuccessPtr, *myReleasePtr;
std::pair<int, int> *myPositionPtr;
wxString *myMessagePtr;
bool myIsSucceeded;
std::pair<int, int> myPosition;
wxString myMessage;
};
#endif

74
src/wraplibxml.cpp
View File

@ -27,18 +27,67 @@
#include <wx/wx.h>
void WrapLibxml::Init() throw()
{
static class Initializer
{
public:
Initializer () throw ()
{
xmlSetGenericErrorFunc ( xmlGenericErrorContext, &Initializer::OnXmlGenericError );
LIBXML_TEST_VERSION
xmlInitializeCatalog();
initGenericErrorDefaultFunc ( NULL );
}
~Initializer ()
{
xsltCleanupGlobals();
xmlCatalogCleanup();
xmlCleanupParser();
}
static void XMLCDECL OnXmlGenericError (void *ctx, const char *msg, ...) throw()
{
va_list args;
size_t size = 128;
std::string buffer;
int chars;
for (;;)
{
buffer.resize ( size );
if ( buffer.size() < size )
throw std::runtime_error ( "Out of memory" );
va_start(args, msg);
chars = vsnprintf( (char *) buffer.c_str(), size, msg, args);
va_end(args);
if ( chars >= 0 && ( size_t ) chars < size )
{
buffer.resize ( chars );
throw std::runtime_error ( buffer );
}
if ( chars >= 0 )
size = chars + 1;
else
throw std::runtime_error (
std::string ( "Can't format message: " ) + msg );
}
}
} dummy;
}
WrapLibxml::WrapLibxml ( bool netAccessParameter, const std::string& catalogPathParameter )
: netAccess ( netAccessParameter ), catalogPath ( catalogPathParameter )
{
LIBXML_TEST_VERSION
xmlInitializeCatalog();
WrapLibxml::Init();
}
WrapLibxml::~WrapLibxml()
{
xsltCleanupGlobals();
xmlCleanupParser();
xmlCatalogCleanup();
}
bool WrapLibxml::validate ( const std::string& fileName )
@ -82,8 +131,6 @@ bool WrapLibxml::validateRelaxNG (
{
output = "";
xmlCleanupParser();
xmlRelaxNGValidCtxtPtr ctxtPtr;
xmlDocPtr docPtr;
xmlRelaxNGParserCtxtPtr schemaParserCtxtPtr;
@ -133,7 +180,6 @@ bool WrapLibxml::validateW3CSchema (
{
output = "";
xmlCleanupParser();
xmlSchemaValidCtxtPtr ctxtPtr;
xmlDocPtr docPtr;
xmlSchemaParserCtxtPtr schemaParserCtxtPtr;
@ -184,7 +230,6 @@ bool WrapLibxml::parse (
{
output = "";
xmlCleanupParser();
xmlParserCtxtPtr ctxt;
xmlDocPtr docPtr;
@ -245,8 +290,6 @@ bool WrapLibxml::xpath ( const std::string& path, const std::string& fileName )
{
output = "";
xmlCleanupParser();
xmlParserCtxtPtr ctxt;
xmlDocPtr docPtr;
@ -320,8 +363,6 @@ bool WrapLibxml::xpath ( const std::string& path, const std::string& fileName )
xmlFreeDoc ( docPtr );
xmlFreeParserCtxt ( ctxt );
xmlCleanupParser();
return xpathIsValid;
}
@ -330,7 +371,6 @@ bool WrapLibxml::xslt (
const std::string& fileName
)
{
xmlCleanupParser();
output = "";
xsltStylesheetPtr cur;
@ -388,8 +428,6 @@ bool WrapLibxml::xslt (
bool WrapLibxml::bufferWellFormed ( const std::string& buffer )
{
xmlCleanupParser();
xmlParserCtxtPtr ctxt = xmlNewParserCtxt();
if ( !ctxt )
return false;
@ -415,8 +453,6 @@ int WrapLibxml::saveEncoding (
const std::string& fileName,
const std::string& encoding )
{
xmlCleanupParser();
xmlParserCtxtPtr ctxt = xmlNewParserCtxt();
if ( !ctxt )
return -1;
@ -455,8 +491,6 @@ int WrapLibxml::saveEncodingFromFile (
const std::string& fileNameDestination,
const std::string& encoding )
{
xmlCleanupParser();
xmlParserCtxtPtr ctxt = xmlNewParserCtxt();
if ( !ctxt )
return -1;

1
src/wraplibxml.h
View File

@ -38,6 +38,7 @@
class WrapLibxml
{
public:
static void Init() throw();
WrapLibxml (
bool netAccessParameter = false,
const std::string& catalogPathParameter = "catalog" );

29
src/wrapxerces.cpp
View File

@ -30,8 +30,26 @@
using namespace xercesc;
void WrapXerces::Init() throw()
{
static class Initializer
{
public:
Initializer()
{
XMLPlatformUtils::Initialize();
}
~Initializer()
{
XMLPlatformUtils::Terminate();
}
} dummy;
}
WrapXerces::WrapXerces( std::string catalogPath, std::string catalogUtilityPath )
{
WrapXerces::Init();
errorPosition = std::make_pair ( 1, 1 );
catalogResolver = new XercesCatalogResolver( catalogPath, catalogUtilityPath );
}
@ -98,7 +116,7 @@ bool WrapXerces::validateMemory (
const char *system,
unsigned len )
{
SAX2XMLReader *parser = XMLReaderFactory::createXMLReader();
std::auto_ptr<SAX2XMLReader> parser ( XMLReaderFactory::createXMLReader() );
parser->setFeature ( XMLUni::fgSAX2CoreNameSpaces, true );
parser->setFeature ( XMLUni::fgSAX2CoreValidation, true );
@ -116,10 +134,7 @@ bool WrapXerces::validateMemory (
parser->setEntityResolver ( catalogResolver );
XMLByte* xmlBuffer = (XMLByte*) buffer;
MemBufInputSource source (
xmlBuffer,
len,
system );
MemBufInputSource source ( xmlBuffer, len, system );
try
{
@ -127,13 +142,11 @@ bool WrapXerces::validateMemory (
}
catch ( XMLException& e )
{
delete parser;
lastError = wxEmptyString;
return false;
}
catch ( SAXParseException& e )
{
delete parser;
lastError << _T ( "Ln " ) << e.getLineNumber() << _T ( " Col " )
<< e.getColumnNumber() << _T ( ": " ) << toString ( e.getMessage() );
errorPosition = std::make_pair ( e.getLineNumber(), e.getColumnNumber() );
@ -141,11 +154,9 @@ bool WrapXerces::validateMemory (
}
catch ( ... )
{
delete parser;
lastError = wxEmptyString;
return false;
}
delete parser;
return true;
}

1
src/wrapxerces.h
View File

@ -36,6 +36,7 @@ using namespace xercesc;
class WrapXerces
{
public:
static void Init() throw ();
WrapXerces( std::string catalogPath = "",
std::string catalogUtilityPath = "" );
~WrapXerces();

8
src/xmlcopyeditor.cpp
View File

@ -324,9 +324,6 @@ MyApp::~MyApp()
delete checker;
delete server;
delete connection;
// Terminate Xerces-C++
XMLPlatformUtils::Terminate();
}
bool MyApp::OnInit()
@ -387,8 +384,11 @@ bool MyApp::OnInit()
wxImage::AddHandler ( new wxPNGHandler );
wxSystemOptions::SetOption ( _T ( "msw.remap" ), 0 );
// Initialize libxml
WrapLibxml::Init();
// Initialize Xerces-C++
XMLPlatformUtils::Initialize();
WrapXerces::Init();
frame = new MyFrame (
_ ( "XML Copy Editor" ),

84
src/xmlctrl.cpp
View File

@ -25,6 +25,8 @@
#include "xmlcopyeditor.h" // needed to enable validation-as-you-type alerts
#include <utility>
#include <memory>
#include "validationthread.h"
// adapted from wxSTEdit (c) 2005 John Labenski, Otto Wyss
#define XMLCTRL_HASBIT(value, bit) (((value) & (bit)) != 0)
@ -38,6 +40,7 @@ BEGIN_EVENT_TABLE ( XmlCtrl, wxStyledTextCtrl )
EVT_LEFT_UP ( XmlCtrl::OnMouseLeftUp )
EVT_RIGHT_UP ( XmlCtrl::OnMouseRightUp )
EVT_MIDDLE_DOWN ( XmlCtrl::OnMiddleDown )
EVT_THREAD(wxEVT_COMMAND_VALIDATION_COMPLETED, XmlCtrl::OnValidationCompleted)
END_EVENT_TABLE()
// global protection for validation threads
@ -68,14 +71,10 @@ XmlCtrl::XmlCtrl (
auxPath ( auxPathParameter )
{
validationThread = NULL;
validationStarted = false;
validationFinished = false;
grammarFound = false;
validationRequired = (buffer) ? true : false; // NULL for plain XML template
validationReleasePtr = new bool;
*validationReleasePtr = false;
currentMaxLine = 1;
applyProperties ( propertiesParameter );
@ -123,7 +122,7 @@ XmlCtrl::XmlCtrl (
for ( int i = 0; i < wxSTC_INDIC_MAX; ++i )
IndicatorSetStyle ( i, wxSTC_INDIC_HIDDEN );
IndicatorSetStyle ( 2, wxSTC_INDIC_SQUIGGLE );
IndicatorSetForeground ( 0, *wxRED );
IndicatorSetForeground ( 2, *wxRED );
}
@ -133,17 +132,11 @@ XmlCtrl::~XmlCtrl()
elementMap.clear();
entitySet.clear();
if ( validationStarted && !validationFinished )
if ( validationThread != NULL )
{
*validationReleasePtr = true;
// don't delete validationReleasePtr because the thread will check the value before exiting
// this means that 1 variable of type bool will be leaked in this case
// the alternative is waiting for the validation thread to finish, which can take anything up to several minutes
return;
validationThread->Kill();
delete validationThread;
}
delete validationReleasePtr;
}
@ -169,28 +162,30 @@ void XmlCtrl::OnIdle ( wxIdleEvent& event )
{
if ( properties.number && type != FILE_TYPE_BINARY )
adjustNoColumnWidth(); // exits if unchanged
}
// poll validation thread output if any
void XmlCtrl::OnValidationCompleted ( wxThreadEvent &event )
{
wxCriticalSectionLocker locker ( xmlcopyeditorCriticalSection );
if ( validationThread == NULL )
return;
MyFrame *frame = (MyFrame *)GetGrandParent();
clearErrorIndicators ( GetLineCount() );
if ( validationThread->isSucceeded() )
{
wxCriticalSectionLocker locker ( xmlcopyeditorCriticalSection );
if (validationStarted && validationFinished)
{
validationStarted = false;
MyFrame *frame = (MyFrame *)GetGrandParent();
if ( validationSuccess )
{
clearErrorIndicators ( GetLineCount() );
frame->statusProgress ( wxEmptyString );
}
else
{
clearErrorIndicators ( GetLineCount() );
setErrorIndicator ( validationPosition.first - 1, 0 );
frame->statusProgress ( validationMessage );
}
}
frame->statusProgress ( wxEmptyString );
}
else
{
setErrorIndicator ( validationThread->getPosition().first - 1, 0 );
frame->statusProgress ( validationThread->getMessage() );
}
validationThread->Wait();
delete validationThread;
validationThread = NULL;
}
void XmlCtrl::OnChar ( wxKeyEvent& event )
@ -1976,36 +1971,29 @@ bool XmlCtrl::backgroundValidate (
return true;
wxCriticalSectionLocker locker ( xmlcopyeditorCriticalSection );
if ( validationStarted && !validationFinished )
if ( validationThread != NULL )
{
*validationReleasePtr = true;
return true; // wait for next idle cycle call from main app frame
}
validationRequired = false;
*validationReleasePtr = false;
validationThread = new ValidationThread(
GetEventHandler(),
buffer,
system,
catalogPath.c_str(),
catalogUtilityPath.c_str(),
&validationFinished,
&validationSuccess,
validationReleasePtr,
&validationPosition,
&validationMessage
catalogUtilityPath.c_str()
);
if ( validationThread->Create() != wxTHREAD_NO_ERROR )
if ( validationThread->Create() != wxTHREAD_NO_ERROR
|| validationThread->Run() != wxTHREAD_NO_ERROR )
{
validationStarted = false;
validationFinished = true;
delete validationThread;
validationThread = NULL;
return false;
}
validationStarted = true;
validationFinished = false;
validationThread->Run();
return true;
}

13
src/xmlctrl.h
View File

@ -27,7 +27,8 @@
#include <string>
#include <set>
#include <map>
#include "validationthread.h"
class ValidationThread;
struct XmlCtrlProperties
{
@ -146,14 +147,7 @@ class XmlCtrl: public wxStyledTextCtrl
bool getValidationRequired();
void setValidationRequired ( bool b );
private:
// the following are used for background validation
ValidationThread *validationThread;
bool validationStarted,
validationFinished,
validationSuccess;
bool *validationReleasePtr;
std::pair<int, int> validationPosition;
wxString validationMessage;
ValidationThread *validationThread; // used for background validation
int type;
bool *protectTags;
@ -191,6 +185,7 @@ class XmlCtrl: public wxStyledTextCtrl
void OnMarginClick ( wxStyledTextEvent& event );
void OnChar ( wxKeyEvent& event );
void OnIdle ( wxIdleEvent& event );
void OnValidationCompleted (wxThreadEvent &event);
void OnKeyPressed ( wxKeyEvent& event );
void OnMouseLeftDown ( wxMouseEvent& event );
void OnMouseLeftUp ( wxMouseEvent& event );