private void FindNearestBeginEventPosition(ref bool isCorrectBeginEvent, string currentFilePath, ref long newStreamPosition, int stepSize = 1)
{
int attemptToFoundBeginEventLine = 0;
while (!isCorrectBeginEvent && attemptToFoundBeginEventLine < 10)
{
string beginEventLine;
using (FileStream fileStreamCheckPosition =
new FileStream(currentFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
fileStreamCheckPosition.Seek(newStreamPosition, SeekOrigin.Begin);
using (StreamReader fileStreamCheckReader = new StreamReader(fileStreamCheckPosition))
beginEventLine = fileStreamCheckReader.ReadLineWithoutNull();
}
if (beginEventLine == null)
{
isCorrectBeginEvent = false;
break;
}
isCorrectBeginEvent = LogParserTechJournal.ItsBeginOfEvent(beginEventLine);
if (!isCorrectBeginEvent)
{
newStreamPosition -= stepSize;
attemptToFoundBeginEventLine += 1;
}
}
}
public bool GoToEvent(long eventNumber)
{
Reset();
int fileIndex = -1;
long currentLineNumber = -1;
long currentEventNumber = 0;
bool moved = false;
foreach (string logFile in _logFilesWithData)
{
fileIndex += 1;
currentLineNumber = -1;
IEnumerable <string> allLines = File.ReadLines(logFile);
foreach (string line in allLines)
{
currentLineNumber += 1;
if (LogParserTechJournal.ItsBeginOfEvent(line))
{
currentEventNumber += 1;
}
if (currentEventNumber == eventNumber)
{
moved = true;
break;
}
}
if (currentEventNumber == eventNumber)
{
moved = true;
break;
}
}
if (moved && fileIndex >= 0 && currentLineNumber >= 0)
{
InitializeStream(currentLineNumber, fileIndex);
_eventCount = eventNumber - 1;
_currentFileEventNumber = eventNumber;
return(true);
}
else
{
return(false);
}
}
private long GetEventCount()
{
long eventCount = 0;
foreach (var logFile in _logFilesWithData)
{
using (StreamReader logFileStream = new StreamReader(File.Open(logFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
{
do
{
string logFileCurrentString = logFileStream.ReadLineWithoutNull();
if (LogParserTechJournal.ItsBeginOfEvent(logFileCurrentString))
{
eventCount++;
}
} while (!logFileStream.EndOfStream);
}
}
return(eventCount);
}
public bool Read()
{
bool output;
try
{
if (!InitializeReadFileStream())
{
return(false);
}
RaiseBeforeReadFileEvent(out bool cancelBeforeReadFile);
if (cancelBeforeReadFile)
{
NextFile();
return(Read());
}
while (true)
{
string sourceData = ReadSourceDataFromStream();
if (sourceData != null)
{
AddNewLineToSource(sourceData, true);
}
if (LogParserTechJournal.ItsEndOfEvent(_stream, sourceData) || sourceData == null)
{
_currentFileEventNumber += 1;
string preparedSourceData = _eventSource.ToString();
_eventSource.Clear();
RaiseBeforeRead(new BeforeReadEventArgs(preparedSourceData, _currentFileEventNumber));
if (sourceData == null && preparedSourceData.Length == 0)
{
NextFile();
output = Read();
break;
}
try
{
RowData eventData = ReadRowData(preparedSourceData);
_currentRow = eventData;
RaiseAfterRead(new AfterReadEventArgs(_currentRow, _currentFileEventNumber));
output = true;
break;
}
catch (Exception ex)
{
RaiseOnError(new OnErrorEventArgs(ex, preparedSourceData, false));
_currentRow = null;
output = true;
break;
}
}
}
}
catch (Exception ex)
{
RaiseOnError(new OnErrorEventArgs(ex, null, true));
_currentRow = null;
output = false;
}
return(output);
}
private RowData ReadRowData(string sourceData)
{
RowData eventData = LogParserTechJournal.Parse(sourceData, CurrentFile);
return(eventData);
}
public bool Read()
{
bool output;
try
{
if (!InitializeReadFileStream())
{
return(false);
}
RaiseBeforeReadFileEvent(out bool cancelBeforeReadFile);
if (cancelBeforeReadFile)
{
NextFile();
return(Read());
}
bool newLine = true;
DateTime maxLogPeriod = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, _logTimeZoneInfo).AddMilliseconds((-1) * _readDelayMs);
_currentStreamPosition = _stream?.GetPosition() ?? 0;
while (true)
{
if (_firstReadForFile)
{
_sourceData = _stream.ReadLineWithoutNull();
_firstReadForFile = false;
}
if (_sourceData == null)
{
NextFile();
output = Read();
break;
}
AddNewLineToSource(_sourceData, newLine);
long currentStreamPositionBeforeGoAheadRead = _stream?.GetPosition() ?? 0;
if (LogParserTechJournal.ItsEndOfEvent(_stream, CurrentFile, out _sourceData))
{
_currentFileEventNumber += 1;
_currentStreamPosition = currentStreamPositionBeforeGoAheadRead;
string preparedSourceData = _eventSource.ToString();
_eventSource.Clear();
if (_sourceData == null)
{
_firstReadForFile = true;
}
RaiseBeforeRead(new BeforeReadEventArgs(preparedSourceData, _currentFileEventNumber));
try
{
EventData eventData = ReadRowData(preparedSourceData);
if (eventData.Period >= maxLogPeriod)
{
_currentRow = null;
output = false;
break;
}
else
{
_currentRow = eventData;
RaiseAfterRead(new AfterReadEventArgs(_currentRow, _currentFileEventNumber));
output = true;
break;
}
}
catch (Exception ex)
{
RaiseOnError(new OnErrorEventArgs(ex, preparedSourceData, false));
_currentRow = null;
output = true;
break;
}
}
newLine = false;
}
}
catch (FileNotFoundException)
{
_currentRow = null;
output = false;
}
catch (Exception ex)
{
RaiseOnError(new OnErrorEventArgs(ex, null, true));
_currentRow = null;
output = false;
}
return(output);
}
private EventData ReadRowData(string sourceData)
{
EventData eventData = LogParserTechJournal.Parse(sourceData, CurrentFile, _currentFileEventNumber, _logTimeZoneInfo);
return(eventData);
}