/// <summary>
/// Removes the given outage from the outage log.
/// </summary>
/// <param name="outage">The outage to be removed from the outage log.</param>
/// <returns>True if the outage was removed; false otherwise.</returns>
public bool Remove(Outage outage)
{
bool removed;
bool modified;
using (FileStream stream = GetFileLock(File.OpenWrite))
using (StreamReader reader = new StreamReader(stream))
using (StreamWriter writer = new StreamWriter(stream))
{
List <Outage> outages = ReadLog(reader);
modified = !m_outages.SequenceEqual(outages);
outages.AddRange(m_outages);
outages = Outage.MergeOverlapping(outages).ToList();
removed = outages.Remove(outage);
modified |= !m_outages.SequenceEqual(outages);
if (modified)
{
m_outages.Clear();
m_outages.AddRange(outages);
stream.SetLength(0L);
WriteLog(writer);
}
}
if (modified)
{
LogModified?.Invoke(this, EventArgs.Empty);
}
return(removed);
}
// Watches for changes to the log and adds additional outages entered by external processes.
private void m_logFileWatcher_Changed(object sender, FileSystemEventArgs e)
{
long lastWriteTime = File.GetLastWriteTimeUtc(m_fileName).Ticks;
if (Interlocked.Exchange(ref m_lastReadTime, lastWriteTime) == lastWriteTime)
{
return;
}
if (Interlocked.CompareExchange(ref m_suppressFileWatcher, 0, 1) == 1)
{
return;
}
ThreadPool.QueueUserWorkItem(state =>
{
try
{
bool modified;
using (FileStream stream = GetFileLock(File.OpenWrite))
using (StreamReader reader = new StreamReader(stream))
using (StreamWriter writer = new StreamWriter(stream))
{
List <Outage> outages = ReadLog(reader);
modified = !m_outages.SequenceEqual(outages);
if (modified)
{
outages.AddRange(m_outages);
m_outages.Clear();
m_outages.AddRange(Outage.MergeOverlapping(outages));
stream.SetLength(0L);
WriteLog(writer);
}
}
if (modified)
{
LogModified?.Invoke(this, EventArgs.Empty);
}
}
catch (Exception ex)
{
OnProcessException(ex);
}
});
}