/// <summary>
/// Performs an atomic clear and enqueue of the specified item
/// </summary>
/// <param name="item"></param>
public void ReplaceWith(CleanupWorkItem item)
{
lock (_sync) {
queue.Clear();
queue.AddLast(item);
}
}
private void PopulateFolder(CleanupWorkItem item, bool recursive)
{
//Do the local work.
if (!cache.Index.GetIsValid(item.RelativePath))
{
if (logger != null)
{
Stopwatch sw = new Stopwatch();
sw.Start();
cache.Index.populate(item.RelativePath, item.PhysicalPath);
sw.Stop();
logger.LogTrace("{0}ms: Querying file system about {1}", sw.ElapsedMilliseconds.ToString(NumberFormatInfo.InvariantInfo).PadLeft(4), item.RelativePath);
}
else
{
cache.Index.populate(item.RelativePath, item.PhysicalPath);
}
}
if (recursive)
{
//Queue the recursive work.
IList <string> names = cache.Index.getSubfolders(item.RelativePath);
List <CleanupWorkItem> childWorkItems = new List <CleanupWorkItem>(names.Count);
foreach (string n in names)
{
childWorkItems.Add(new CleanupWorkItem(CleanupWorkItem.Kind.PopulateFolderRecursive, addSlash(item.RelativePath, false) + n, addSlash(item.PhysicalPath, true) + n));
}
queue.InsertRange(childWorkItems);
}
}
private void DoTask(CleanupWorkItem item)
{
Stopwatch sw = null;
if (logger != null)
{
sw = new Stopwatch(); sw.Start();
}
if (item.Task == CleanupWorkItem.Kind.RemoveFile)
{
RemoveFile(item);
}
else if (item.Task == CleanupWorkItem.Kind.CleanFolderRecursive || item.Task == CleanupWorkItem.Kind.CleanFolder)
{
CleanFolder(item, item.Task == CleanupWorkItem.Kind.PopulateFolderRecursive);
}
else if (item.Task == CleanupWorkItem.Kind.PopulateFolderRecursive || item.Task == CleanupWorkItem.Kind.PopulateFolder)
{
PopulateFolder(item, item.Task == CleanupWorkItem.Kind.PopulateFolderRecursive);
}
else if (item.Task == CleanupWorkItem.Kind.FlushAccessedDate)
{
FlushAccessedDate(item);
}
if (logger != null)
{
sw.Stop();
}
logger?.LogTrace("{2}ms: Executing task {0} {1} ({3} tasks remaining)", item.Task.ToString(), item.RelativePath, sw.ElapsedMilliseconds.ToString(NumberFormatInfo.InvariantInfo).PadLeft(4), queue.Count.ToString(NumberFormatInfo.InvariantInfo));
}
public override bool Equals(object obj)
{
CleanupWorkItem other = obj as CleanupWorkItem;
if (other == null)
{
return(false);
}
return(other.Task == Task && other.RelativePath == RelativePath && other.PhysicalPath == PhysicalPath && other.LazyProvider == LazyProvider);
}
public CleanupWorkItem Pop()
{
lock (_sync) {
CleanupWorkItem i = queue.Count > 0 ? queue.First.Value : null;
if (i != null)
{
queue.RemoveFirst();
}
return(i);
}
}
/// <summary>
/// Queues the item if no other identical items exist in the queue. Returns true if the item was added.
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public bool QueueIfUnique(CleanupWorkItem item)
{
lock (_sync) {
bool unique = !queue.Contains(item);
if (unique)
{
queue.AddLast(item);
}
return(unique);
}
}
public void FlushAccessedDate(CleanupWorkItem item)
{
CachedFileInfo c = cache.Index.getCachedFileInfo(item.RelativePath);
if (c == null)
{
return; //File was already deleted, nothing to do.
}
try{
cache.Locks.TryExecute(item.RelativePath.ToUpperInvariant(), 1, delegate()
{
File.SetLastAccessTimeUtc(item.PhysicalPath, c.AccessedUtc);
});
//In both of these exception cases, we don't care.
}catch (FileNotFoundException) {
}catch (UnauthorizedAccessException) {
}
}
private void RemoveFile(CleanupWorkItem item)
{
//File names are never embedded into the first item, they are provided on-demand by a LazyProvider
LazyTaskProvider provider = item.LazyProvider;
item = provider();
if (item == null)
{
return; //The provider is out of possible items
}
item.LazyProvider = provider; //So if this item fails, we can queue 'item' again and the next task run will get the next alternative.
bool removedFile = false;
cache.Locks.TryExecute(item.RelativePath.ToUpperInvariant(), 10, delegate() {
//If the file is already gone, consider the mission a success.
if (!System.IO.File.Exists(item.PhysicalPath))
{
cache.Index.setCachedFileInfo(item.RelativePath, null);
removedFile = true;
return;
}
//Cool, we got a lock on the file.
//Remove it from the cache. Better a miss than an invalidation.
cache.Index.setCachedFileInfo(item.RelativePath, null);
try {
System.IO.File.Delete(item.PhysicalPath);
} catch (IOException) {
return; //The file is in use, or has an open handle. - try the next file.
} catch (UnauthorizedAccessException) {
return; //Invalid NTFS permissions or readonly file. - try the next file
}
cache.Index.setCachedFileInfo(item.RelativePath, null); //In case it crossed paths.
removedFile = true;
});
//If we didn't remove a file, insert the task back in the queue for the next iteration.
if (!removedFile)
{
queue.Insert(item);
}
}
public void Insert(CleanupWorkItem item)
{
lock (_sync) {
queue.AddFirst(item);
}
}
public bool Exists(CleanupWorkItem item)
{
lock (_sync) {
return(queue.Contains(item));
}
}
public void Queue(CleanupWorkItem item)
{
lock (_sync) {
queue.AddLast(item);
}
}
private void CleanFolder(CleanupWorkItem item, bool recursive)
{
//If we don't have an up-to-date folder level, we can't work..
if (!cache.Index.GetIsValid(item.RelativePath))
{
//Put this task back where it was, but with a 'populate/populaterecursive' right before it.
//We could actually make this Populate non-recursive, since the recursive Clean would just insert Populates beforehand anyway.
queue.InsertRange(new CleanupWorkItem[] {
new CleanupWorkItem(recursive ? CleanupWorkItem.Kind.PopulateFolderRecursive : CleanupWorkItem.Kind.PopulateFolder, item.RelativePath, item.PhysicalPath),
item
});
return;
}
string baseRelative = addSlash(item.RelativePath, false);
string basePhysical = addSlash(item.PhysicalPath, true);
//Ok, it's valid.
//Queue the recursive work.
if (item.Task == CleanupWorkItem.Kind.CleanFolderRecursive)
{
IList <string> names = cache.Index.getSubfolders(item.RelativePath);
List <CleanupWorkItem> childWorkItems = new List <CleanupWorkItem>(names.Count);
foreach (string n in names)
{
childWorkItems.Add(new CleanupWorkItem(CleanupWorkItem.Kind.CleanFolderRecursive, baseRelative + n, basePhysical + n));
}
queue.InsertRange(childWorkItems);
}
//Now do the local work
int files = cache.Index.getFileCount(item.RelativePath);
//How much are we over?
int overMax = Math.Max(0, files - cs.MaximumItemsPerFolder);
int overOptimal = Math.Max(0, (files - overMax) - cs.TargetItemsPerFolder);
if (overMax + overOptimal < 1)
{
return; //nothing to do
}
if (overMax > 0)
{
lock (_timesLock) lastFoundItemsOverMax = DateTime.UtcNow.Ticks;
}
//Make a linked list, like a queue of files.
LinkedList <KeyValuePair <string, CachedFileInfo> > sortedList = new LinkedList <KeyValuePair <string, CachedFileInfo> >(
cache.Index.getSortedSubfiles(item.RelativePath));
//This callback will execute (overMax) number of times
CleanupWorkItem obsessive = new CleanupWorkItem(CleanupWorkItem.Kind.RemoveFile, delegate() {
//Pop the next item
KeyValuePair <string, CachedFileInfo> file;
while (sortedList.Count > 0)
{
file = sortedList.First.Value; sortedList.RemoveFirst();
if (cs.ShouldRemove(baseRelative + file.Key, file.Value, true))
{
return(new CleanupWorkItem(CleanupWorkItem.Kind.RemoveFile, baseRelative + file.Key, basePhysical + file.Key));
}
}
return(null); //No matching items left.
});
CleanupWorkItem relaxed = new CleanupWorkItem(CleanupWorkItem.Kind.RemoveFile, delegate() {
//Pop the next item
KeyValuePair <string, CachedFileInfo> file;
while (sortedList.Count > 0)
{
file = sortedList.First.Value; sortedList.RemoveFirst();
if (cs.ShouldRemove(baseRelative + file.Key, file.Value, false))
{
return(new CleanupWorkItem(CleanupWorkItem.Kind.RemoveFile, baseRelative + file.Key, basePhysical + file.Key));
}
}
return(null); //No matching items left.
});
//The 'obsessive' ones must be processed first, thus added last.
for (int i = 0; i < overOptimal; i++)
{
queue.Insert(relaxed);
}
for (int i = 0; i < overMax; i++)
{
queue.Insert(obsessive);
}
}
