dispose (#83)

Author: bitfaster

BitFaster.Caching/Lru/TemplateConcurrentLru.cs

@@ -148,6 +148,11 @@ public V GetOrAdd(K key, Func<K, V> valueFactory)
                 return newItem.Value;
             }
 
+            if (newItem.Value is IDisposable d)
+            {
+                d.Dispose();
+            }
+
             return this.GetOrAdd(key, valueFactory);
         }
 
@@ -171,6 +176,11 @@ public async Task<V> GetOrAddAsync(K key, Func<K, Task<V>> valueFactory)
                 return newItem.Value;
             }
 
+            if (newItem.Value is IDisposable d)
+            {
+                d.Dispose();
+            }
+
             return await this.GetOrAddAsync(key, valueFactory).ConfigureAwait(false);
         }