Added DirectoryObserver

2024-09-29 13:10:39 +01:00
parent dc1afd5750
commit 760ce933bd
5 changed files with 96 additions and 49 deletions
@@ -0,0 +1,54 @@
+using System.Collections.Concurrent;
+
+namespace Toolkit.Foundation;
+
+public class DirectoryObserver
+{
+    public static async Task<string[]> EnumerateFiles(string path,
+        string[] filter,
+        int count,
+        CancellationToken cancellationToken = default)
+    {
+        string[] files = [];
+        HashSet<string> extensions = filter.Select(x => $".{x.ToLower()}").ToHashSet();
+
+        bool IsBatchComplete()
+        {
+            files = Directory.EnumerateFiles(path, "*.*", SearchOption.TopDirectoryOnly)
+                   .Where(x => extensions.Contains(Path.GetExtension(x).ToLower()))
+                   .ToArray();
+
+            if (files.Length != count)
+            {
+                return false;
+            }
+
+            ConcurrentBag<bool> fileAccessResults = [];
+            Parallel.ForEach(files, (file) =>
+            {
+                try
+                {
+                    using FileStream fileStream = new(file, FileMode.Open, FileAccess.Read, FileShare.None);
+                    fileAccessResults.Add(true);
+                }
+                catch (IOException)
+                {
+                    fileAccessResults.Add(false);
+                }
+            });
+
+            return fileAccessResults.All(result => result);
+        }
+
+        await Task.Run(async () =>
+        {
+            while (!IsBatchComplete())
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                await Task.Delay(5000, cancellationToken);
+            }
+        }, cancellationToken);
+
+        return files;
+    }
+}