New: All setting values are cached for better responsiveness.

NzbDrone.Core.Test/Framework/CoreTest.cs

@@ -1,7 +1,9 @@
 using System;
 using System.IO;
+using NUnit.Framework;
 using NzbDrone.Common;
 using NzbDrone.Core.Model.Notification;
+using NzbDrone.Core.Providers.Core;
 using NzbDrone.Test.Common;
 using PetaPoco;
 
@@ -60,5 +62,11 @@ namespace NzbDrone.Core.Test.Framework
                 return new ProgressNotification("Mock notification");
             }
         }
+
+        [TearDown]
+        public void CoreTestTearDown()
+        {
+            ConfigProvider.ClearCache();
+        }
     }
 }

NzbDrone.Core.Test/NzbDrone.Core.Test.csproj

@@ -113,6 +113,7 @@
     <Compile Include="JobTests\BannerDownloadJobTest.cs" />
     <Compile Include="JobTests\RecentBacklogSearchJobTest.cs" />
     <Compile Include="ProviderTests\AnalyticsProviderTests\AnalyticsProviderFixture.cs" />
+    <Compile Include="ProviderTests\ConfigProviderTests\ConfigCachingFixture.cs" />
     <Compile Include="ProviderTests\DecisionEngineTests\QualityAllowedByProfileSpecificationFixtrue.cs" />
     <Compile Include="ProviderTests\DecisionEngineTests\UpgradeHistorySpecificationFixtrue.cs" />
     <Compile Include="ProviderTests\DecisionEngineTests\UpgradeDiskSpecificationFixtrue.cs" />
@@ -172,7 +173,7 @@
     <Compile Include="ProviderTests\IndexerProviderTest.cs" />
     <Compile Include="ProviderTests\HistoryProviderTest.cs" />
     <Compile Include="ProviderTests\MediaFileProviderTest.cs" />
-    <Compile Include="ProviderTests\ConfigProviderTest.cs" />
+    <Compile Include="ProviderTests\ConfigProviderTests\ConfigProviderFixture.cs" />
     <Compile Include="ProviderTests\EpisodeProviderTest.cs" />
     <Compile Include="Framework\TestDbHelper.cs" />
     <Compile Include="ParserTest.cs" />

NzbDrone.Core.Test/ProviderTests/ConfigProviderTests/ConfigCachingFixture.cs

@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+using System.Linq;
+using FluentAssertions;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Core.Providers.Core;
+using NzbDrone.Core.Repository;
+using NzbDrone.Core.Test.Framework;
+using PetaPoco;
+
+namespace NzbDrone.Core.Test.ProviderTests.ConfigProviderTests
+{
+    [TestFixture]
+    public class ConfigCachingFixture : CoreTest
+    {
+        [SetUp]
+        public void Setup()
+        {
+            Mocker.GetMock<IDatabase>().Setup(c => c.Fetch<Config>())
+                    .Returns(new List<Config> { new Config { Key = "Key1", Value = "Value1" } });
+
+        }
+
+        [Test]
+        public void getting_value_more_than_once_should_hit_db_once()
+        {
+            Mocker.Resolve<ConfigProvider>().GetValue("Key1", null).Should().Be("Value1");
+            Mocker.Resolve<ConfigProvider>().GetValue("Key1", null).Should().Be("Value1");
+            Mocker.Resolve<ConfigProvider>().GetValue("Key1", null).Should().Be("Value1");
+
+            Mocker.GetMock<IDatabase>().Verify(c => c.Fetch<Config>(), Times.Once());
+        }
+
+    }
+}

NzbDrone.Core.Test/ProviderTests/ConfigProviderTests/ConfigProviderFixture.cs

@@ -6,11 +6,11 @@ using NzbDrone.Core.Providers.Core;
 using NzbDrone.Core.Repository;
 using NzbDrone.Core.Test.Framework;
 
-namespace NzbDrone.Core.Test.ProviderTests
+namespace NzbDrone.Core.Test.ProviderTests.ConfigProviderTests
 {
     [TestFixture]
     // ReSharper disable InconsistentNaming
-    public class ConfigProviderTest : CoreTest
+    public class ConfigProviderFixture : CoreTest
     {
         [SetUp]
         public void SetUp()
@@ -134,6 +134,15 @@ namespace NzbDrone.Core.Test.ProviderTests
             guid.Should().NotBeEmpty();
         }
 
+        [Test]
+        public void updating_a_vakye_should_update_its_value()
+        {
+            Mocker.Resolve<ConfigProvider>().SabHost = "Test";
+            Mocker.Resolve<ConfigProvider>().SabHost.Should().Be("Test");
+
+            Mocker.Resolve<ConfigProvider>().SabHost = "Test2";
+            Mocker.Resolve<ConfigProvider>().SabHost.Should().Be("Test2");
+        }
 
         [Test]
         [Description("This test will use reflection to ensure each config property read/writes to a unique key")]

NzbDrone.Core/Providers/Core/ConfigProvider.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Ninject;
 using NLog;
 using NzbDrone.Core.Model;
@@ -11,7 +12,10 @@ namespace NzbDrone.Core.Providers.Core
 {
     public class ConfigProvider
     {
-        private static readonly Logger Logger = LogManager.GetCurrentClassLogger();
+        private static readonly Logger logger = LogManager.GetCurrentClassLogger();
+
+        private static Dictionary<string, string> cache = new Dictionary<string, string>();
+
         private readonly IDatabase _database;
 
         [Inject]
@@ -24,7 +28,7 @@ namespace NzbDrone.Core.Providers.Core
         {
         }
 
-        public IList<Config> All()
+        public IEnumerable<Config> All()
         {
             return _database.Fetch<Config>();
         }
@@ -449,12 +453,15 @@ namespace NzbDrone.Core.Providers.Core
 
         public virtual string GetValue(string key, object defaultValue, bool persist = false)
         {
-            var dbValue = _database.SingleOrDefault<Config>("WHERE [Key] =@0", key);
+            EnsureCache();
+
 
-            if (dbValue != null && !String.IsNullOrEmpty(dbValue.Value))
-                return dbValue.Value;
+            string dbValue;
 
-            Logger.Trace("Unable to find config key '{0}' defaultValue:'{1}'", key, defaultValue);
+            if (cache.TryGetValue(key, out dbValue) && dbValue != null && !String.IsNullOrEmpty(dbValue))
+                return dbValue;
+
+            logger.Trace("Unable to find config key '{0}' defaultValue:'{1}'", key, defaultValue);
 
             if (persist)
                 SetValue(key, defaultValue.ToString());
@@ -479,7 +486,7 @@ namespace NzbDrone.Core.Providers.Core
             if (value == null)
                 throw new ArgumentNullException("key");
 
-            Logger.Trace("Writing Setting to file. Key:'{0}' Value:'{1}'", key, value);
+            logger.Trace("Writing Setting to file. Key:'{0}' Value:'{1}'", key, value);
 
             var dbValue = _database.SingleOrDefault<Config>("WHERE [KEY]=@0", key);
 
@@ -490,11 +497,28 @@ namespace NzbDrone.Core.Providers.Core
             else
             {
                 dbValue.Value = value;
-                using (var tran = _database.GetTransaction())
-                {
                 _database.Update(dbValue);
-                    tran.Complete();
             }
+
+            ClearCache();
+        }
+
+        private void EnsureCache()
+        {
+            lock (cache)
+            {
+                if (!cache.Any())
+                {
+                    cache = _database.Fetch<Config>().ToDictionary(c => c.Key, c => c.Value);
+                }
+            }
+        }
+
+        public static void ClearCache()
+        {
+            lock (cache)
+            {
+                cache = new Dictionary<string, string>();
             }
         }
     }

NzbDrone.Web/Controllers/SystemController.cs

@@ -84,8 +84,8 @@ namespace NzbDrone.Web.Controllers
 
             return Json(new
                             {
-                                    iTotalRecords = config.Count,
-                                    iTotalDisplayRecords = config.Count,
+                                iTotalRecords = config.Count(),
+                                iTotalDisplayRecords = config.Count(),
                                 aaData = config
                             }, JsonRequestBehavior.AllowGet);
         }