// Monitors for roll-over notifications
private void m_rolloverWatcher_Elapsed(object sender, ElapsedEventArgs e)
{
// Don't start another rollover activity if one is already in progress...
if (Monitor.TryEnter(m_watcherLock))
{
try
{
// Read the inter-process communications file for changes in roll-over state
if ((object)m_archiveFile != null && (object)m_archiveFile.IntercomFile != null && m_archiveFile.IntercomFile.IsOpen)
{
m_archiveFile.IntercomFile.Load();
IntercomRecord record = m_archiveFile.IntercomFile.Read(1);
if ((object)record != null)
{
// Pause processing
if (record.RolloverInProgress && m_archiveFile.IsOpen)
{
// Notify internal archive file components about the pending rollover
m_archiveFile.RolloverWaitHandle.Reset();
// Raise roll-over start event (sets m_rolloverInProgress flag)
m_archiveFile.OnRolloverStart();
// Wait for pending to reads to yield
m_archiveFile.WaitForReadersRelease();
// Close the active archive file stream so it can be rolled-over
m_archiveFile.CloseStream();
}
// Resume processing
if (!record.RolloverInProgress && !m_archiveFile.IsOpen)
{
// Open new active archive file stream
m_archiveFile.OpenStream();
// Raise roll-over complete event (resets m_rolloverInProgress flag)
m_archiveFile.OnRolloverComplete();
// Notify waiting internal archive components that rollover is complete
m_archiveFile.RolloverWaitHandle.Set();
}
}
}
}
catch (ThreadAbortException)
{
throw;
}
catch (Exception ex)
{
OnDataReadException(new InvalidOperationException("Exception encountered during roll-over processing: " + ex.Message, ex));
}
finally
{
Monitor.Exit(m_watcherLock);
}
}
}
