static void UpdateWatchers(CancellationToken token)
{
if (token.IsCancellationRequested)
{
return;
}
lock (watchers) {
if (token.IsCancellationRequested)
{
return;
}
newWatchers.Clear();
foreach (var node in tree.Normalize(maxWatchers))
{
if (token.IsCancellationRequested)
{
return;
}
var dir = node.GetPath().ToString();
if (Directory.Exists(dir))
{
newWatchers.Add(dir);
}
}
if (newWatchers.Count == 0 && watchers.Count == 0)
{
// Unchanged.
return;
}
toRemove.Clear();
foreach (var kvp in watchers)
{
var directory = kvp.Key;
if (!newWatchers.Contains(directory))
{
toRemove.Add(directory);
}
}
// After this point, the watcher update is real and a destructive operation, so do not use the token.
if (token.IsCancellationRequested)
{
return;
}
// First remove the watchers, so we don't spin too many threads.
foreach (var directory in toRemove)
{
RemoveWatcher_NoLock(directory);
}
// Add the new ones.
foreach (var path in newWatchers)
{
// Don't modify a watcher that already exists.
if (watchers.ContainsKey(path))
{
continue;
}
var watcher = new FileWatcherWrapper(path);
watchers.Add(path, watcher);
try {
watcher.EnableRaisingEvents = true;
} catch (UnauthorizedAccessException e) {
LoggingService.LogWarning("Access to " + path + " denied. Stopping file watcher.", e);
watcher.Dispose();
watchers.Remove(path);
}
}
}
}
static void UpdateWatchers(CancellationToken token)
{
if (token.IsCancellationRequested)
{
return;
}
lock (watchers) {
if (token.IsCancellationRequested)
{
return;
}
var newPathsToWatch = tree.Normalize(maxWatchers).Select(node => (FilePath)node.FullPath);
var newWatchers = new HashSet <FilePath> (newPathsToWatch.Where(dir => Directory.Exists(dir)));
if (newWatchers.Count == 0 && watchers.Count == 0)
{
// Unchanged.
return;
}
List <FilePath> toRemove;
if (newWatchers.Count == 0)
{
toRemove = watchers.Keys.ToList();
}
else
{
toRemove = new List <FilePath> ();
foreach (var kvp in watchers)
{
var directory = kvp.Key;
if (!newWatchers.Contains(directory))
{
toRemove.Add(directory);
}
}
}
// After this point, the watcher update is real and a destructive operation, so do not use the token.
if (token.IsCancellationRequested)
{
return;
}
// First remove the watchers, so we don't spin too many threads.
foreach (var directory in toRemove)
{
RemoveWatcher_NoLock(directory);
}
// Add the new ones.
if (newWatchers.Count == 0)
{
return;
}
foreach (var path in newWatchers)
{
// Don't modify a watcher that already exists.
if (watchers.ContainsKey(path))
{
continue;
}
var watcher = new FileWatcherWrapper(path);
watchers.Add(path, watcher);
watcher.EnableRaisingEvents = true;
}
}
}