add SingleEphemeral + breaking change: remove name from CleanupSelfAsync

src/Ephemerally.Azure.Cosmos/CosmosContainerEphemeral.cs

@@ -10,8 +10,8 @@ public CosmosContainerEphemeral(
         base(container, x => x.Id, options.OrDefault())
     { }
 
-    protected override Task CleanupSelfAsync(string fullName) =>
-        Value.Database.TryDeleteContainerAsync(fullName);
+    protected override Task CleanupSelfAsync() =>
+        Value.Database.TryDeleteContainerAsync(Metadata.FullName);
 
     protected override Task CleanupAllAsync() =>
         Value.Database.TryCleanupContainersAsync();

src/Ephemerally.Azure.Cosmos/CosmosDatabaseEphemeral.cs

@@ -10,8 +10,8 @@ public CosmosDatabaseEphemeral(
         : base(database, x => x.Id, options.OrDefault())
     { }
 
-    protected override Task CleanupSelfAsync(string fullName) =>
-        Value.Client.TryDeleteDatabaseAsync(fullName);
+    protected override Task CleanupSelfAsync() =>
+        Value.Client.TryDeleteDatabaseAsync(Metadata.FullName);
 
     protected override Task CleanupAllAsync() =>
         Value.Client.TryCleanupDatabasesAsync();

src/Ephemerally/Ephemeral.cs

@@ -25,7 +25,7 @@ protected Ephemeral(TValue value, Func<TValue,string> getFullName, EphemeralOpti
     /// In an overridden implementation, this method should delete the TObject.
     /// </summary>
     /// <returns></returns>
-    protected abstract Task CleanupSelfAsync(string fullName);
+    protected abstract Task CleanupSelfAsync();
 
     /// <summary>
     /// In an overridden implementation, this method should delete all expired TObject.
@@ -37,7 +37,7 @@ public async ValueTask DisposeAsync()
     {
         if (_options.CleanupBehavior == CleanupBehavior.NoCleanup) return;
 
-        await CleanupSelfAsync(FullName).ConfigureAwait(false);
+        await CleanupSelfAsync().ConfigureAwait(false);
         if (_options.CleanupBehavior == CleanupBehavior.SelfOnly) return;
 
         await CleanupAllAsync().ConfigureAwait(false);

src/Ephemerally/PublicExtensions.cs

@@ -13,4 +13,7 @@ public static bool IsExpiredAsOf(this IEphemeralMetadata metadata, DateTimeOffse
 
     public static IEphemeralMetadata GetContainerMetadata(this string fullName) =>
         EphemeralMetadata.New(fullName);
+
+    public static IEphemeral<T> ToEphemeral<T>(this T value,
+        Func<Task> cleanupSelfAsync) where T : class => new SingleEphemeral<T>(value, cleanupSelfAsync);
 }

src/Ephemerally/SingleEphemeral.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Ephemerally;
+
+public sealed class SingleEphemeral<T> : Ephemeral<T> where T : class
+{
+    private readonly Func<Task> _cleanupSelfAsync;
+
+    public SingleEphemeral(
+        T value,
+        Func<Task> cleanupSelfAsync) 
+        : base(value, x => string.Empty, new EphemeralOptions { CleanupBehavior = CleanupBehavior.SelfOnly })
+    {
+        _cleanupSelfAsync = cleanupSelfAsync;
+    }
+
+    protected override Task CleanupSelfAsync() => _cleanupSelfAsync();
+
+    protected override Task CleanupAllAsync() => Task.CompletedTask;
+}