Clean/CleanAsync in cache implementations

Caches/FileDbCache/FileDbCache.cs

@@ -70,17 +70,6 @@ namespace MapControl.Caching
             fileDb.Dispose();
         }
 
-        public void Clean()
-        {
-            var deleted = fileDb.DeleteRecords(new FilterExpression(expiresField, DateTime.UtcNow, ComparisonOperatorEnum.LessThanOrEqual));
-
-            if (deleted > 0)
-            {
-                Debug.WriteLine($"FileDbCache: Deleted {deleted} expired items");
-                fileDb.Clean();
-            }
-        }
-
         public byte[] Get(string key)
         {
             CheckArgument(key);
@@ -177,6 +166,17 @@ namespace MapControl.Caching
             }
         }
 
+        public void Clean()
+        {
+            var deleted = fileDb.DeleteRecords(new FilterExpression(expiresField, DateTime.UtcNow, ComparisonOperatorEnum.LessThanOrEqual));
+
+            if (deleted > 0)
+            {
+                Debug.WriteLine($"FileDbCache: Deleted {deleted} expired items");
+                fileDb.Clean();
+            }
+        }
+
         public Task<byte[]> GetAsync(string key, CancellationToken token = default)
         {
             return Task.FromResult(Get(key));
@@ -200,6 +200,12 @@ namespace MapControl.Caching
             return Task.CompletedTask;
         }
 
+        public Task CleanAsync()
+        {
+            Clean();
+            return Task.CompletedTask;
+        }
+
         private static void CheckArgument(string key)
         {
             if (string.IsNullOrEmpty(key))

Caches/SQLiteCache/SQLiteCache.cs

@@ -50,25 +50,6 @@ namespace MapControl.Caching
             connection.Dispose();
         }
 
-        public void Clean()
-        {
-            using (var command = new SQLiteCommand("delete from items where expiration < @exp", connection))
-            {
-                command.Parameters.AddWithValue("@exp", DateTimeOffset.UtcNow.Ticks);
-                command.ExecuteNonQuery();
-            }
-#if DEBUG
-            using (var command = new SQLiteCommand("select changes()", connection))
-            {
-                var deleted = (long)command.ExecuteScalar();
-                if (deleted > 0)
-                {
-                    Debug.WriteLine($"SQLiteCache: Deleted {deleted} expired items");
-                }
-            }
-#endif
-        }
-
         public byte[] Get(string key)
         {
             CheckArgument(key);
@@ -201,6 +182,44 @@ namespace MapControl.Caching
             }
         }
 
+        public void Clean()
+        {
+            using (var command = new SQLiteCommand("delete from items where expiration < @exp", connection))
+            {
+                command.Parameters.AddWithValue("@exp", DateTimeOffset.UtcNow.Ticks);
+                command.ExecuteNonQuery();
+            }
+#if DEBUG
+            using (var command = new SQLiteCommand("select changes()", connection))
+            {
+                var deleted = (long)command.ExecuteScalar();
+                if (deleted > 0)
+                {
+                    Debug.WriteLine($"SQLiteCache: Deleted {deleted} expired items");
+                }
+            }
+#endif
+        }
+
+        public async Task CleanAsync()
+        {
+            using (var command = new SQLiteCommand("delete from items where expiration < @exp", connection))
+            {
+                command.Parameters.AddWithValue("@exp", DateTimeOffset.UtcNow.Ticks);
+                await command.ExecuteNonQueryAsync();
+            }
+#if DEBUG
+            using (var command = new SQLiteCommand("select changes()", connection))
+            {
+                var deleted = (long)await command.ExecuteScalarAsync();
+                if (deleted > 0)
+                {
+                    Debug.WriteLine($"SQLiteCache: Deleted {deleted} expired items");
+                }
+            }
+#endif
+        }
+
         private SQLiteCommand GetItemCommand(string key)
         {
             var command = new SQLiteCommand("select expiration, buffer from items where key = @key", connection);

MapControl/Shared/ImageFileCache.cs

@@ -38,11 +38,8 @@ namespace MapControl.Caching
             rootDirectory = directory;
 
             Debug.WriteLine($"Created ImageFileCache in {rootDirectory}");
-        }
 
-        public Task CleanAsync()
+            ThreadPool.QueueUserWorkItem(o => Clean());
-        {
-            return Task.Factory.StartNew(CleanRootDirectory, TaskCreationOptions.LongRunning);
         }
 
         public byte[] Get(string key)
@@ -253,21 +250,7 @@ namespace MapControl.Caching
             }
         }
 
-        private string GetPath(string key)
+        public void Clean()
-        {
-            try
-            {
-                return Path.Combine(rootDirectory, Path.Combine(key.Split('/')));
-            }
-            catch (Exception ex)
-            {
-                Debug.WriteLine($"ImageFileCache: Invalid key {rootDirectory}/{key}: {ex.Message}");
-            }
-
-            return null;
-        }
-
-        private void CleanRootDirectory()
         {
             try
             {
@@ -287,6 +270,25 @@ namespace MapControl.Caching
             }
         }
 
+        public Task CleanAsync()
+        {
+            return Task.Factory.StartNew(Clean, TaskCreationOptions.LongRunning);
+        }
+
+        private string GetPath(string key)
+        {
+            try
+            {
+                return Path.Combine(rootDirectory, Path.Combine(key.Split('/')));
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine($"ImageFileCache: Invalid key {rootDirectory}/{key}: {ex.Message}");
+            }
+
+            return null;
+        }
+
         private static int CleanDirectory(DirectoryInfo directory)
         {
             var deletedFileCount = 0;