private void SendEventsFromJournal(bool checkOtherFiles)
{
lock (@lock)
try
{
// We are not checking file size to make decision about whether
// we should read the file. Reason being - the log write operations
// are often buffered, so we need to open the file to flush buffers
filePosition = ReadJournalFromPosition(CurrentFile, filePosition);
if (checkOtherFiles)
{
var latestFile = LogEnumerator.GetLogFiles(LogDirectory).First();
if (latestFile != CurrentFile)
{
CurrentFile = latestFile;
filePosition = ReadJournalFromPosition(CurrentFile, 0);
}
}
}
catch (Exception e)
{
logger.Error(e, "Error while reading journal file {0}", CurrentFile);
filePosition = new FileInfo(CurrentFile).Length; // Skipping the 'poisoned' data
}
}
/// <summary>
///
/// </summary>
/// <param name="logDirectoryProvider">Log directory name provider</param>
/// <param name="checkInterval">Check interval in milliseconds</param>
public JournalMonitor(ILogDirectoryNameProvider logDirectoryProvider, int checkInterval = 5000)
{
LogDirectory = logDirectoryProvider.Directory;
fileWatcher = new FileSystemWatcher(LogDirectory);
fileWatcher.Changed += FileWatcher_Event;
fileWatcher.Created += FileWatcher_Event;
fileWatcher.NotifyFilter = NotifyFilters.CreationTime |
NotifyFilters.FileName |
NotifyFilters.LastWrite |
NotifyFilters.Size;
logFlushTimer.AutoReset = true;
logFlushTimer.Interval = checkInterval; // sometimes the filesystem event does not trigger
logFlushTimer.Elapsed += (o, e) => Task.Factory.StartNew(() => SendEventsFromJournal(false));
logFlushTimer.Enabled = true;
CurrentFile = LogEnumerator.GetLogFiles(LogDirectory).First();
filePosition = new FileInfo(CurrentFile).Length;
SendEventsFromJournal(false);
fileWatcher.EnableRaisingEvents = true;
logger.Info("Started monitoring on folder {0}", LogDirectory);
}