Implemented cache for QualityDefinitionService to reduce db calls.

src/NzbDrone.Core/Jobs/TaskManager.cs

@@ -100,6 +100,9 @@ namespace NzbDrone.Core.Jobs
 
         public void Handle(CommandExecutedEvent message)
         {
+            if (message.Command.GetType().Name == "BroadcastSignalRMessage")
+                return;
+
             var scheduledTask = _scheduledTaskRepository.All().SingleOrDefault(c => c.TypeName == message.Command.GetType().FullName);
 
             if (scheduledTask != null)

src/NzbDrone.Core/Qualities/QualityDefinitionService.cs

@@ -4,6 +4,7 @@ using NLog;
 using NzbDrone.Core.Lifecycle;
 using NzbDrone.Core.Messaging.Events;
 using System;
+using NzbDrone.Common.Cache;
 
 namespace NzbDrone.Core.Qualities
 {
@@ -17,22 +18,31 @@ namespace NzbDrone.Core.Qualities
     public class QualityDefinitionService : IQualityDefinitionService, IHandle<ApplicationStartedEvent>
     {
         private readonly IQualityDefinitionRepository _qualityDefinitionRepository;
+        private readonly ICached<Dictionary<Quality, QualityDefinition>> _cache;
         private readonly Logger _logger;
 
-        public QualityDefinitionService(IQualityDefinitionRepository qualityDefinitionRepository, Logger logger)
+        public QualityDefinitionService(IQualityDefinitionRepository qualityDefinitionRepository, ICacheManager cacheManager, Logger logger)
         {
             _qualityDefinitionRepository = qualityDefinitionRepository;
+            _cache = cacheManager.GetCache<Dictionary<Quality, QualityDefinition>>(this.GetType());
             _logger = logger;
         }
 
+        private Dictionary<Quality, QualityDefinition> GetAll()
+        {
+            return _cache.Get("all", () => _qualityDefinitionRepository.All().ToDictionary(v => v.Quality), TimeSpan.FromSeconds(5.0));
+        }
+
         public void Update(QualityDefinition qualityDefinition)
         {
             _qualityDefinitionRepository.Update(qualityDefinition);
+
+            _cache.Clear();
         }
 
         public List<QualityDefinition> All()
         {
-            return _qualityDefinitionRepository.All().ToList();
+            return GetAll().Values.ToList();
         }
         
         public QualityDefinition Get(Quality quality)
@@ -40,7 +50,7 @@ namespace NzbDrone.Core.Qualities
             if (quality == Quality.Unknown)
                 return new QualityDefinition(Quality.Unknown);
 
-            return _qualityDefinitionRepository.GetByQualityId((int)quality);
+            return GetAll()[quality];
         }
         
         public void InsertMissingDefinitions(List<QualityDefinition> allDefinitions)
@@ -89,6 +99,8 @@ namespace NzbDrone.Core.Qualities
                     _qualityDefinitionRepository.Update(existingDefinitions[i]);
                 }
             }
+
+            _cache.Clear();
         }
 
         public void Handle(ApplicationStartedEvent message)