add activity log feature

MediaBrowser.Server.Implementations/Activity/ActivityManager.cs

@@ -0,0 +1,40 @@
+using MediaBrowser.Common.Events;
+using MediaBrowser.Controller.Activity;
+using MediaBrowser.Model.Activity;
+using MediaBrowser.Model.Events;
+using MediaBrowser.Model.Logging;
+using MediaBrowser.Model.Querying;
+using System;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Server.Implementations.Activity
+{
+    public class ActivityManager : IActivityManager
+    {
+        public event EventHandler<GenericEventArgs<ActivityLogEntry>> EntryCreated;
+        
+        private readonly IActivityRepository _repo;
+        private readonly ILogger _logger;
+
+        public ActivityManager(ILogger logger, IActivityRepository repo)
+        {
+            _logger = logger;
+            _repo = repo;
+        }
+
+        public async Task Create(ActivityLogEntry entry)
+        {
+            entry.Id = Guid.NewGuid().ToString("N");
+            entry.Date = DateTime.UtcNow;
+
+            await _repo.Create(entry).ConfigureAwait(false);
+
+            EventHelper.FireEventIfNotNull(EntryCreated, this, new GenericEventArgs<ActivityLogEntry>(entry), _logger);
+        }
+
+        public QueryResult<ActivityLogEntry> GetActivityLogEntries(int? startIndex, int? limit)
+        {
+            return _repo.GetActivityLogEntries(startIndex, limit);
+        }
+    }
+}