private void Execute(SandboxLoader loader, PendingAction action)
{
try
{
switch (action.Type)
{
case PendingActionType.CreateOrUpdate:
loader.CreateOrUpdate(action.Path);
break;
case PendingActionType.Remove:
loader.Delete(action.Path);
break;
case PendingActionType.Reload:
foreach (string file in Directory.EnumerateFiles(action.Path, "*.csproj", SearchOption.AllDirectories))
{
_pendingActions.Enqueue(PendingAction.CreateOrUpdate(file));
}
break;
}
}
catch (Exception e)
{
// We should retry operations for certain failures because
// changes are the operation will succeed the next time.
// Reasons are:
// - The file is currently owned by another process
// - The file is being modified and not yet ready to be consumed
// - Some other related race condition occured that will likely be remedied in the future
// Algorithm:
// Exponential backoff with a fixed upper limit of tries.
// TODO: Implement!
Log.ErrorFormat("Caught unexpected exception while executing '{0}': {1}",
action,
e);
}
}
public SandboxWatchdog(string rootFolder)
{
if (rootFolder == null)
{
throw new ArgumentNullException("rootFolder");
}
_filesystem = new FileSystem();
_rootFolder = rootFolder;
_pendingActions = new ConcurrentQueue <PendingAction>();
_currentSandbox = new Sandbox(Enumerable.Empty <Solution>(), Enumerable.Empty <Project>());
_thread = new Thread(ExecutePendingActions)
{
IsBackground = true
};
_fileSystemWatcher = new FileSystemWatcher(_rootFolder)
{
IncludeSubdirectories = true,
NotifyFilter = NotifyFilters.LastWrite |
NotifyFilters.FileName |
NotifyFilters.CreationTime |
NotifyFilters.Size,
Filter = "*.csproj"
};
_fileSystemWatcher.Created += OnCreated;
_fileSystemWatcher.Deleted += OnDeleted;
_fileSystemWatcher.Changed += OnChanged;
_fileSystemWatcher.Renamed += OnRenamed;
_fileSystemWatcher.Error += OnError;
_fileSystemWatcher.EnableRaisingEvents = true;
_pendingActions.Enqueue(PendingAction.Reload(_rootFolder));
_thread.Start();
}
private void OnRenamed(object sender, RenamedEventArgs e)
{
_pendingActions.Enqueue(PendingAction.CreateOrUpdate(e.Name));
}
private void OnChanged(object sender, FileSystemEventArgs e)
{
_pendingActions.Enqueue(PendingAction.CreateOrUpdate(e.Name));
}
private void OnDeleted(object sender, FileSystemEventArgs e)
{
_pendingActions.Enqueue(PendingAction.Delete(e.Name));
}