task: fix absolute expiration when set using timespans

Credit to @Meberem and @Sinhk
- fixes #84
- fixes #100
- closes #117
- closes #85

Author: alastairtree

LazyCache/CachingService.cs

@@ -93,6 +93,7 @@ object CacheFactory(ICacheEntry entry) =>
                 new Lazy<T>(() =>
                 {
                     var result = addItemFactory(entry);
+                    SetAbsoluteExpirationFromRelative(entry);
                     EnsureEvictionCallbackDoesNotReturnTheAsyncOrLazy<T>(entry.PostEvictionCallbacks);
                     return result;
                 });
@@ -136,6 +137,15 @@ object CacheFactory(ICacheEntry entry) =>
             }
         }
 
+        private static void SetAbsoluteExpirationFromRelative(ICacheEntry entry)
+        {
+            if (!entry.AbsoluteExpirationRelativeToNow.HasValue) return;
+
+            var absoluteExpiration = DateTimeOffset.UtcNow + entry.AbsoluteExpirationRelativeToNow.Value;
+            if (!entry.AbsoluteExpiration.HasValue || absoluteExpiration < entry.AbsoluteExpiration)
+                entry.AbsoluteExpiration = absoluteExpiration;
+        }
+
         public virtual void Remove(string key)
         {
             ValidateKey(key);
@@ -163,6 +173,7 @@ object CacheFactory(ICacheEntry entry) =>
                 new AsyncLazy<T>(() =>
                 {
                     var result = addItemFactory(entry);
+                    SetAbsoluteExpirationFromRelative(entry);
                     EnsureEvictionCallbackDoesNotReturnTheAsyncOrLazy<T>(entry.PostEvictionCallbacks);
                     return result;
                 });

ReleaseNotes.md

@@ -1,5 +1,9 @@
 # Release notes for LazyCache #
 
+## Version 2.0.5
+- Fix #85 and #100 Absolute expiration not working with TimeSpan. Thank you to @Meberem and @Sinhk.
+- Fix #124 casing for PackageReference - by @jnyrup 
+
 ## Version 2.0.4
 - Fix #82 Make constructor resolution  specific when using aspnet core dependency injection