/**
* Atomically save \a doc to specified name. Prior to saving, back up
* of old config data is created, and only then data is saved.
*/
bool AtomicXmlFile::saveDocument(const QDomDocument& doc) const
{
if (!saveDocument(doc, tempFileName())) {
qWarning("AtomicXmlFile::saveDocument(): Unable to save '%s'. Possibly drive is full.",
qPrintable(tempFileName()));
return false;
}
if (QFile::exists(backupFileName()))
QFile::remove(backupFileName());
if (QFile::exists(fileName_)) {
if (!QFile::rename(fileName_, backupFileName())) {
qWarning("AtomicXmlFile::saveDocument(): Unable to rename '%s' to '%s'.",
qPrintable(fileName_), qPrintable(backupFileName()));
return false;
}
}
if (!QFile::rename(tempFileName(), fileName_)) {
qWarning("AtomicXmlFile::saveDocument(): Unable to rename '%s' to '%s'.",
qPrintable(tempFileName()), qPrintable(fileName_));
return false;
}
return true;
}
/**
* Tries to load \a doc from config file, or if that fails, from a back up.
*/
bool AtomicXmlFile::loadDocument(QDomDocument* doc) const
{
Q_ASSERT(doc);
QStringList fileNames;
fileNames << tempFileName()
<< fileName_
<< backupFileName();
foreach(QString fileName, fileNames)
if (loadDocument(doc, fileName))
return true;
return false;
}
bool LIB_EDIT_FRAME::backupFile( const wxFileName& aOriginalFile, const wxString& aBackupExt )
{
if( aOriginalFile.FileExists() )
{
wxFileName backupFileName( aOriginalFile );
backupFileName.SetExt( "bck" );
if( backupFileName.FileExists() )
wxRemoveFile( backupFileName.GetFullPath() );
if( !wxCopyFile( aOriginalFile.GetFullPath(), backupFileName.GetFullPath() ) )
{
DisplayError( this, wxString::Format( _( "Failed to save backup to \"%s\"" ),
backupFileName.GetFullPath() ) );
return false;
}
}
return true;
}
//------------------------------------------------------------------------------
// Replace the currently specified db file with it's corresponding backup file.
// The backup file is a complete backup, not just a backup of a single chunk.
//------------------------------------------------------------------------------
void BulkRollbackFileCompressedHdfs::restoreFromBackup(const char* colType,
OID columnOID,
u_int32_t dbRoot,
u_int32_t partNum,
u_int32_t segNum)
{
// Construct file name for db file to be restored
char dbFileName[FILE_NAME_SIZE];
int rc = fDbFile.getFileName( columnOID, dbFileName,
dbRoot, partNum, segNum );
if (rc != NO_ERROR)
{
std::ostringstream oss;
oss << "Error restoring " << colType <<
" HDFS file for OID " << columnOID <<
"; Can't construct file name for DBRoot" << dbRoot <<
"; partition-" << partNum <<
"; segment-" << segNum;
throw WeException( oss.str(), rc );
}
// Construct file name for backup copy of db file
std::ostringstream ossFile;
ossFile << "/" << columnOID << ".p" << partNum << ".s" << segNum;
std::string backupFileName( fMgr->getMetaFileName() );
backupFileName += DATA_DIR_SUFFIX;
backupFileName += ossFile.str();
std::string dbFileNameTmp = dbFileName;
dbFileNameTmp += OLD_FILE_SUFFIX;
// Log msg but don't abort if backup file does not exist
if ( !IDBPolicy::exists(backupFileName.c_str()) )
{
std::ostringstream msgText;
msgText << "No restore needed for " << colType << " HDFS file" <<
": dbRoot-" << dbRoot <<
"; part#-" << partNum <<
"; seg#-" << segNum <<
" (no backup exists)";
fMgr->logAMessage( logging::LOG_TYPE_INFO,
logging::M0075, columnOID, msgText.str() );
return;
}
// Rename current db file to make room for restored file
rc = IDBPolicy::rename( dbFileName, dbFileNameTmp.c_str() );
if (rc != 0)
{
std::ostringstream oss;
oss << "Error restoring " << colType <<
" HDFS file for OID " << columnOID <<
"; Can't move old file for DBRoot" << dbRoot <<
"; partition-" << partNum <<
"; segment-" << segNum;
throw WeException( oss.str(), ERR_COMP_RENAME_FILE );
}
// Rename backup file to replace current db file
rc = IDBPolicy::rename( backupFileName.c_str(), dbFileName );
if (rc != 0)
{
std::ostringstream oss;
oss << "Error restoring " << colType <<
" HDFS file for OID " << columnOID <<
"; Can't rename backup file for DBRoot" << dbRoot <<
"; partition-" << partNum <<
"; segment-" << segNum;
throw WeException( oss.str(), ERR_METADATABKUP_COMP_RENAME );
}
// Delete db file we just replaced with backup
IDBPolicy::remove( dbFileNameTmp.c_str() );
}
