Reworked configuration monitoring

Hyperbar/Configuration/ConfigurationMonitor.cs

@@ -1,24 +1,33 @@
 namespace Hyperbar;
 
-public class ConfigurationMonitor<TConfiguration> : IInitializer
+public class ConfigurationMonitor<TConfiguration>(IConfigurationSource<TConfiguration> source,
+    IConfigurationReader<TConfiguration> reader,
+    IMediator mediator) : IInitializer
     where TConfiguration :
     class, new()
 {
-    private readonly FileSystemWatcher watcher;
+    private FileSystemWatcher? watcher;
-
-    public ConfigurationMonitor(IConfigurationReader<TConfiguration> reader)
-    {
-        this.watcher = new FileSystemWatcher();
-    }
 
     public Task InitializeAsync()
     {
-        void ChangedHandler(object sender,
+        async void ChangedHandler(object sender,
             FileSystemEventArgs args)
         {
-
+            if (reader.Read() is { } configuration)
+            {
+                await mediator.PublishAsync(new ConfigurationChanged<TConfiguration>(configuration));
+            }
         }
 
+        string fileName = Path.GetFileName(source.Path);
+
+        watcher = new FileSystemWatcher
+        {
+            NotifyFilter = NotifyFilters.LastWrite,
+            Path = source.Path.Replace(fileName, ""),
+            Filter = fileName,
+            EnableRaisingEvents = true
+        };
         watcher.Changed += ChangedHandler;
         return Task.CompletedTask;
     }

Hyperbar/Extensions/IServiceCollectionExtensions.cs

@@ -48,7 +48,7 @@ public static class IServiceCollectionExtensions
             return new ConfigurationSource<TConfiguration>(jsonFilePath, section);
         });
 
-        services.AddTransient<IConfigurationReader<TConfiguration>>(provider =>
+        services.AddSingleton<IConfigurationReader<TConfiguration>>(provider =>
         {
             JsonSerializerOptions? defaultSerializer = null;
             if (serializerDelegate is not null)
@@ -61,7 +61,7 @@ public static class IServiceCollectionExtensions
                 defaultSerializer);
         });
 
-        services.AddTransient<IConfigurationWriter<TConfiguration>>(provider =>
+        services.AddSingleton<IConfigurationWriter<TConfiguration>>(provider =>
         { 
             JsonSerializerOptions? defaultSerializer = null;
             if (serializerDelegate is not null)
@@ -74,6 +74,8 @@ public static class IServiceCollectionExtensions
                 defaultSerializer);
         });
 
+        services.AddSingleton<IInitializer, ConfigurationMonitor<TConfiguration>>();
+
         services.AddTransient(provider => new DefaultConfiguration<TConfiguration>(defaults));
         services.AddTransient<IInitializer, ConfigurationInitializer<TConfiguration>>();
 

Hyperbar/Lifecycles/IInitializer.cs

@@ -4,7 +4,3 @@ public interface IInitializer
 {
     Task InitializeAsync();
 }
-
-public interface IDataTemplateSelector
-{
-}