Externalizing AliasUpdater to a feature

src/Orchard.Web/Modules/Orchard.Alias/Implementation/Updater/AliasHolderUpdater.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Linq;
+using Orchard.Alias.Implementation.Holder;
+using Orchard.Alias.Implementation.Storage;
+using Orchard.Environment;
+using Orchard.Tasks;
+using Orchard.Logging;
+using Orchard.Environment.Extensions;
+
+namespace Orchard.Alias.Implementation.Updater {
+    public interface IAliasHolderUpdater : IDependency {
+        void Refresh();
+    }
+
+    public class AliasHolderUpdater : IAliasHolderUpdater {
+        private readonly IAliasHolder _aliasHolder;
+        private readonly IAliasStorage _storage;
+        private readonly IAliasUpdateCursor _cursor;
+
+        public ILogger Logger { get; set; }
+
+        public AliasHolderUpdater(IAliasHolder aliasHolder, IAliasStorage storage, IAliasUpdateCursor cursor) {
+            _aliasHolder = aliasHolder;
+            _storage = storage;
+            _cursor = cursor;
+            Logger = NullLogger.Instance;
+        }
+
+        public void Refresh() {
+            try {
+                // only retreive aliases which have not been processed yet
+                var aliases = _storage.List(x => x.Id > _cursor.Cursor).ToArray();
+
+                // update the last processed id
+                if (aliases.Any()) {
+                    _cursor.Cursor = aliases.Last().Item5;
+                    _aliasHolder.SetAliases(aliases.Select(alias => new AliasInfo { Path = alias.Item1, Area = alias.Item2, RouteValues = alias.Item3 }));
+                }
+            }
+            catch (Exception ex) {
+                Logger.Error(ex, "Exception during Alias refresh");
+            }
+        }
+    }
+
+    public class AliasUpdaterEvent : IOrchardShellEvents {
+        
+        private readonly IAliasHolderUpdater _aliasHolderUpdater;
+
+        public AliasUpdaterEvent(IAliasHolderUpdater aliasHolderUpdater) {
+            _aliasHolderUpdater = aliasHolderUpdater;
+        }
+        
+        void IOrchardShellEvents.Activated() {
+            _aliasHolderUpdater.Refresh();
+        }
+
+        void IOrchardShellEvents.Terminating() {
+        }
+    }
+}