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Kreta.BusinessLogic/Caching/ElearningCache.cs

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+using System.Collections.Generic;
+using System.Linq;
+using Kreta.BusinessLogic.HelperClasses;
+using Kreta.Core.Elearning.Nexius;
+using Kreta.Framework.Caching;
+using Nexius.IdentityProvider.Model.External.V1;
+
+namespace Kreta.KretaServer.Caching
+{
+    public class ElearningCache : GenericCache<IDictionary<string, KretaCourseCo>>
+    {
+        private static readonly string ElearningCacheKey = $"{nameof(Kreta)}_{nameof(ElearningCache)}";
+
+        public ElearningCache(Framework.Caching.CacheManager cacheManager) : base(cacheManager, nameof(ElearningCache))
+        {
+        }
+
+        public IDictionary<string, Course> GetCourses(IEnumerable<string> idList, INexiusCourseService nexiusCourseService)
+        {
+            var allCourses = GetAllCourses(nexiusCourseService);
+            var result = new Dictionary<string, Course>();
+            foreach (var id in idList)
+            {
+                if (allCourses.TryGetValue(id.ToLower(), out KretaCourseCo co))
+                {
+                    result.Add(id.ToLower(), co.ToCourse());
+                }
+            }
+
+            return result;
+        }
+
+        private IDictionary<string, KretaCourseCo> GetAllCourses(INexiusCourseService nexiusCourseService)
+        {
+            return Get(ElearningCacheKey) ?? LoadAllCourses(nexiusCourseService);
+        }
+
+        private IDictionary<string, KretaCourseCo> LoadAllCourses(INexiusCourseService nexiusCourseService)
+        {
+            var courseDictionary = nexiusCourseService.GetAllCourses().ToDictionary(c => c.Id.ToString().ToLower(), c => new KretaCourseCo(c));
+            AddOrUpdate(ElearningCacheKey, courseDictionary, x => courseDictionary);
+
+            return courseDictionary;
+        }
+    }
+}