Allow expiration removal loop to be disabled (#5)

* Use a single thread loop to delete expired items

* Rollback minimum cache loop to 5 minutes

* Clean up code

* Not exposing class

* Using cancellation tokens

* Split responsibilities into each class

Clean up code

* Allow expiration removal loop to be disabled

* Formatting

Author: dariogriffo

Extensions.Caching.PostgreSql/DatabaseExpiredItemsRemoverLoop.cs

@@ -16,6 +16,7 @@ internal sealed class DatabaseExpiredItemsRemoverLoop : IDatabaseExpiredItemsRem
         private readonly IDatabaseOperations _databaseOperations;
         private readonly CancellationTokenSource _cancellationTokenSource;
         private readonly ISystemClock _systemClock;
+        private readonly bool _disabled;
 
         public DatabaseExpiredItemsRemoverLoop(
             IOptions<PostgreSqlCacheOptions> options,
@@ -24,6 +25,12 @@ public DatabaseExpiredItemsRemoverLoop(
         {
             var cacheOptions = options.Value;
 
+            if ((_disabled = cacheOptions.Disabled) == true)
+            {
+                //No need to configure anything
+                return;
+            }
+
             if (cacheOptions.ExpiredItemsDeletionInterval.HasValue &&
                 cacheOptions.ExpiredItemsDeletionInterval.Value < MinimumExpiredItemsDeletionInterval)
             {
@@ -41,6 +48,11 @@ public DatabaseExpiredItemsRemoverLoop(
 
         public void Start()
         {
+            if (_disabled)
+            {
+                return;
+            }
+
             Task.Run(DeleteExpiredCacheItems);
         }
 

Extensions.Caching.PostgreSql/PostGreSqlCacheOptions.cs

@@ -42,6 +42,11 @@ public class PostgreSqlCacheOptions : IOptions<PostgreSqlCacheOptions>
 		/// </summary>
 		public TimeSpan DefaultSlidingExpiration { get; set; } = TimeSpan.FromMinutes(20);
 
+        /// <summary>
+        /// If set to true this instance of the cache will not remove expired items.
+        /// </summary>
+        public bool Disabled { get; set; }
+
         PostgreSqlCacheOptions IOptions<PostgreSqlCacheOptions>.Value => this;
     }
 }