Add File Monitor

src/c#/GeneralUpdate.SystemService/PersistenceObjects/ProcessPersistence.cs

@@ -1,31 +1,11 @@
 namespace GeneralUpdate.SystemService.PersistenceObjects
 {
-    internal enum ProcessStatus 
-    {
-        /// <summary>
-        /// Processing has not yet begun.
-        /// </summary>
-        NotStarted,
-        /// <summary>
-        /// Processing completed.
-        /// </summary>
-        Completed,
-        /// <summary>
-        /// Processing failure.
-        /// </summary>
-        Failed
-    }
-
     internal class ProcessPersistence
     {
-        public required string Name { get; set; }
-
-        public required string Path { get; set; }
-
-        public required string BackupPath { get; set; }
+        public string Name { get; set; }
 
-        public ProcessStatus Status { get; set; }
+        public string Path { get; set; }
 
-        public DateTime CreateTime { get; set; }
+        public string BackupPath { get; set; }
     }
 }

src/c#/GeneralUpdate.SystemService/PersistenceObjects/WillMessagePersistence.cs

@@ -1,7 +1,27 @@
 namespace GeneralUpdate.SystemService.PersistenceObjects
 {
+    internal enum ProcessStatus
+    {
+        /// <summary>
+        /// Processing has not yet begun.
+        /// </summary>
+        NotStarted,
+        /// <summary>
+        /// Processing completed.
+        /// </summary>
+        Completed,
+        /// <summary>
+        /// Processing failure.
+        /// </summary>
+        Failed
+    }
+
     internal class WillMessagePersistence<T> where T : class
     {
-        public required List<T> Messages { get; set; }
+        public List<T> Messages { get; set; }
+
+        public DateTime CreateTime { get; set; }
+
+        public ProcessStatus Status { get; set; }
     }
 }

src/c#/GeneralUpdate.SystemService/Program.cs

@@ -7,7 +7,7 @@ public class Program
         public static void Main(string[] args)
         {
             var builder = Host.CreateApplicationBuilder(args);
-            builder.Services.AddHostedService<QuartzService>();
+            builder.Services.AddHostedService<WillMessageService>();
             var host = builder.Build();
             host.Run();
         }

src/c#/GeneralUpdate.SystemService/Services/WillMessageService.cs

@@ -0,0 +1,45 @@
+using GeneralUpdate.SystemService.PersistenceObjects;
+
+namespace GeneralUpdate.SystemService.Services
+{
+    internal class WillMessageService : BackgroundService
+    {
+        private readonly string? _path;
+        private FileSystemWatcher _fileWatcher;
+
+        public WillMessageService(IConfiguration configuration) => _path = configuration.GetValue<string>("WatcherPath");
+
+        protected override Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            stoppingToken.Register(() => OnStopping());
+            _fileWatcher = new FileSystemWatcher(_path);
+            // Watch for changes in LastAccess and LastWrite times, and the renaming of files or directories. 
+            _fileWatcher.NotifyFilter = NotifyFilters.LastWrite;
+            // Only watch text files.
+            _fileWatcher.Filter = "*.*";
+            _fileWatcher.Changed += OnChanged;
+            _fileWatcher.EnableRaisingEvents = true;
+            return Task.CompletedTask;
+        }
+
+        private void OnChanged(object sender, FileSystemEventArgs e)
+        {
+            var willMessage = new WillMessagePersistence<ProcessPersistence>();
+            switch (willMessage.Status)
+            {
+                case ProcessStatus.NotStarted:
+                    break;
+                case ProcessStatus.Failed:
+                    break;
+                case ProcessStatus.Completed: 
+                    break;
+            }
+        }
+
+        private void OnStopping()
+        {
+            _fileWatcher.EnableRaisingEvents = false;
+            _fileWatcher.Dispose();
+        }
+    }
+}

src/c#/GeneralUpdate.SystemService/appsettings.json

@@ -4,5 +4,6 @@
       "Default": "Information",
       "Microsoft.Hosting.Lifetime": "Information"
     }
-  }
+  },
+  "WatcherPath": "C:\\generalupdate_willmessage"
 }