/// <inheritdoc/>
public async Task GetChildrenAsync(string pattern, IOperationContext operationContext, IFolderListingResultContext resultContext)
{
// This method has a 60 sec timeout.
// To process longer requests and reset the timout timer call one of the following:
// - resultContext.ReturnChildren() method.
// - resultContext.ReportProgress() method.
Logger.LogMessage($"IFolder.GetChildrenAsync({pattern})", UserFileSystemPath);
IVirtualFolder userFolder = await VirtualDrive.GetItemAsync <IVirtualFolder>(UserFileSystemPath, Logger);
IEnumerable <FileSystemItemMetadataExt> children = await userFolder.EnumerateChildrenAsync(pattern);
// Filtering existing files/folders. This is only required to avoid extra errors in the log.
List <IFileSystemItemMetadata> newChildren = new List <IFileSystemItemMetadata>();
foreach (FileSystemItemMetadataExt child in children)
{
string userFileSystemItemPath = Path.Combine(UserFileSystemPath, child.Name);
if (!FsPath.Exists(userFileSystemItemPath))
{
Logger.LogMessage("Creating", child.Name);
// If the file is moved/renamed and the app is not running this will help us
// to sync the file/folder to remote storage after app starts.
child.CustomData = new CustomData
{
OriginalPath = userFileSystemItemPath
}.Serialize();
newChildren.Add(child);
}
}
// To signal that the children enumeration is completed
// always call ReturnChildren(), even if the folder is empty.
resultContext.ReturnChildren(newChildren.ToArray(), newChildren.Count());
// Save ETags, the read-only attribute and all custom columns data.
foreach (FileSystemItemMetadataExt child in children)
{
string userFileSystemItemPath = Path.Combine(UserFileSystemPath, child.Name);
// Create ETags.
// ETags must correspond with a server file/folder, NOT with a client placeholder.
// It should NOT be moved/deleted/updated when a placeholder in the user file system is moved/deleted/updated.
// It should be moved/deleted when a file/folder in the remote storage is moved/deleted.
await VirtualDrive.GetETagManager(userFileSystemItemPath, Logger).SetETagAsync(child.ETag);
// Set the read-only attribute and all custom columns data.
UserFileSystemRawItem userFileSystemRawItem = VirtualDrive.GetUserFileSystemRawItem(userFileSystemItemPath, Logger);
await userFileSystemRawItem.SetLockedByAnotherUserAsync(child.LockedByAnotherUser);
await userFileSystemRawItem.SetCustomColumnsDataAsync(child.CustomProperties);
}
}
