Migrate away from using job system to trigger background task to reta…

…in cross-version compatibility (#333)

src/Unicorn/Pipelines/UnicornSyncEnd/SendSerializationCompleteEvent.cs

@@ -1,10 +1,11 @@
 using System.Linq;
+using System.Threading;
 using Sitecore.Configuration;
 using Sitecore.Data;
 using Sitecore.Data.Serialization;
 using Sitecore.Diagnostics;
 using Sitecore.Eventing;
-using Sitecore.Jobs;
+using Sitecore.Sites;
 using Unicorn.Predicates;
 
 // ReSharper disable UnusedMember.Global
@@ -31,16 +32,23 @@ protected virtual void DeserializationComplete(string databaseName)
 			Assert.ArgumentNotNullOrEmpty(databaseName, "databaseName");
 
 			// raising this event can take a long time. like 16 seconds. So we boot it as a job so it can go in the background.
-			Job asyncSerializationFinished = new Job(new JobOptions("Raise deserialization complete async", "serialization", "shell", this, "RaiseEvent", new object[] { databaseName }));
-			JobManager.Start(asyncSerializationFinished);
+
+			Log.Info($"Job started: Raise deserialization complete async ({typeof(SendSerializationCompleteEvent).FullName})", this);
+			ThreadPool.QueueUserWorkItem(RaiseEvent, databaseName);
 		}
 
-		public virtual void RaiseEvent(string databaseName)
+		public virtual void RaiseEvent(object state)
 		{
-			EventManager.RaiseEvent(new SerializationFinishedEvent());
-			Database database = Factory.GetDatabase(databaseName, false);
+			using (new SiteContextSwitcher(SiteContext.GetSite("shell")))
+			{
+				var databaseName = state.ToString();
+				EventManager.RaiseEvent(new SerializationFinishedEvent());
+				Database database = Factory.GetDatabase(databaseName, false);
+
+				database?.RemoteEvents.Queue.QueueEvent(new SerializationFinishedEvent());
+			}
 
-			database?.RemoteEvents.Queue.QueueEvent(new SerializationFinishedEvent());
+			Log.Info($"Job ended: Raise deserialization complete async ({typeof(SendSerializationCompleteEvent).FullName})", this);
 		}
 	}
 }