/// <summary>
/// Tries to start running the prepared RFileSystemWatcher.
/// If this fails, blacklists the drive and calls StopWatcher,
/// which cleans up everything related to this drive.
/// </summary>
/// <param name="w">RFileSystemWatcher to start.</param>
private static void StartWatcher(RemovableFileSystemWatcher w)
{
Exception e = null;
try
{
if (!w.WasDisposed)
{
w.EnableRaisingEvents = true;
}
}
catch (IOException ex) //drive unavailable
{
e = ex;
}
catch (ApplicationException ex) //drive is incompatible
{
e = ex;
}
if (e != null) //something bad happened
{
var dName = w.Path;
Debug.WriteLine("DriveManager: cannot inistantiate watcher for {0}, reason:\r\n{1}", dName, e.Message);
BlackList.Add(dName);
StopWatcher(dName);
}
}
/// <summary>
/// The background thread that watches the drives in the system, querying them every 5 seconds
/// </summary>
private static void Worker()
{
begin:
lock (DriveNames) //To ensure no InvalidOperationException occurs in GetDriveLabel()
{ //Also syncs handler above
_drives = DriveInfo.GetDrives();
//Have some drives been removed?
for (int i = DriveNames.Count - 1; i >= 0; i--)
{
var dName = DriveNames[i];
if (_drives.All(d => d.Name != dName)) //drive removed
{
StopWatcher(dName); //stop the COM watcher and remove drive from collection
}
}
//Has blacklisted drive been removed?
BlackList.RemoveAll(bl => _drives.All(d => d.Name != bl));
//Have some drives been addded?
foreach (var driveInfo in _drives)
{
var dName = driveInfo.Name;
if (DriveNames.All(d => d != dName)) //drive added
{
if (IsDriveValid(driveInfo))
{
RemovableFileSystemWatcher w;
try
{
w = new RemovableFileSystemWatcher(dName, _reportingHandle);
}
catch (ArgumentException ex)
{
Debug.WriteLine("DriveManager: cannot inistantiate watcher for {0}, reason:\r\n{1}",
dName, ex.Message);
BlackList.Add(dName);
continue;
}
DriveNames.Add(dName); //Add drive to collection
var fn = GetFormattedDriveLabel(dName); //override deadlock
Util.Send(() => //Add drive to UI
_drivesRoot.Items.Add(new PowerItem
{
Argument = dName,
AutoExpand = true,
IsFolder = true,
Parent = _drivesRoot,
NonCachedIcon = true,
FriendlyName = fn
}));
//Add drive watcher
w.Created += PushEvent;
w.Deleted += PushEvent;
w.Changed += PushEvent;
w.Renamed += PushEvent;
w.IncludeSubdirectories = true;
Watchers.Add(w);
if (BtnStck.IsInstantited)
{
StartWatcher(w);
}
else
{
BtnStck.Instanciated += (sender, args) => StartWatcher(w);
}
}
}
}
}
if (!Util.MainDisp.HasShutdownStarted)
{
Thread.Sleep(5000);
goto begin; //just don't want unneeded code nesting here, anyway IL will be same.
}
DriveNames.ForEach(StopWatcher);
}
