[msbuild] Move shared/duplicated code into base XamarinBuildTask clas…

…s from the FindILLink/FindAotCompiler tasks. (#19360)

msbuild/Xamarin.MacDev.Tasks/Tasks/FindAotCompilerTaskBase.cs

@@ -5,14 +5,14 @@
 using Xamarin.Localization.MSBuild;
 
 namespace Xamarin.MacDev.Tasks {
-	public abstract class FindAotCompilerTaskBase : XamarinBuildTask {
+	public class FindAotCompiler : XamarinBuildTask {
 		[Required]
 		public ITaskItem [] MonoAotCrossCompiler { get; set; }
 
 		[Output]
 		public string AotCompiler { get; set; }
 
-		public override bool Execute ()
+		protected override bool ExecuteLocally ()
 		{
 			// If we can't find the AOT compiler path in MonoAotCrossCompiler, evaluate a project file that does know how to find it.
 			// This happens when executing remotely from Windows, because the MonoAotCrossCompiler item group will be empty in that case.

msbuild/Xamarin.MacDev.Tasks/Tasks/FindILLink.cs

@@ -1,21 +1,15 @@
-using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using Microsoft.Build.Framework;
-using Microsoft.Build.Tasks;
 using Xamarin.Localization.MSBuild;
-using Xamarin.Messaging.Build.Client;
 
 namespace Xamarin.MacDev.Tasks {
-	public class FindILLink : XamarinBuildTask, ITaskCallback, ICancelableTask {
+	public class FindILLink : XamarinBuildTask {
 		[Output]
 		public string ILLinkPath { get; set; }
 
-		public override bool Execute ()
+		protected override bool ExecuteLocally ()
 		{
-			if (this.ShouldExecuteRemotely (SessionId))
-				return new TaskRunner (SessionId, BuildEngine4).RunAsync (this).Result;
-
 			var targetName = "ComputeILLinkTaskPath";
 			var target = $@"<Target Name=""{targetName}"">
 	<WriteLinesToFile File=""$(OutputFilePath)"" Lines=""$(ILLinkTasksAssembly)"" />
@@ -35,18 +29,6 @@ public override bool Execute ()
 
 			return !Log.HasLoggedErrors;
 		}
-
-		public IEnumerable<ITaskItem> GetAdditionalItemsToBeCopied () => Enumerable.Empty<ITaskItem> ();
-
-		public bool ShouldCopyToBuildServer (ITaskItem item) => false;
-
-		public bool ShouldCreateOutputFile (ITaskItem item) => false;
-
-		public void Cancel ()
-		{
-			if (ShouldExecuteRemotely ())
-				BuildConnection.CancelAsync (BuildEngine4).Wait ();
-		}
 	}
 }
 

msbuild/Xamarin.MacDev.Tasks/Tasks/XamarinBuildTask.cs

@@ -5,10 +5,11 @@
 using Microsoft.Build.Framework;
 using Microsoft.Build.Tasks;
 using Xamarin.Localization.MSBuild;
+using Xamarin.Messaging.Build.Client;
 using Threading = System.Threading.Tasks;
 
 namespace Xamarin.MacDev.Tasks {
-	public abstract class XamarinBuildTask : XamarinTask {
+	public abstract class XamarinBuildTask : XamarinTask, ITaskCallback, ICancelableTask {
 		public bool KeepTemporaryOutput { get; set; }
 
 		[Required]
@@ -110,6 +111,27 @@ async Threading.Task<string> ExecuteBuildAsync (string dotnetPath, string projec
 				return File.ReadAllText (outputFile).Trim ();
 			return string.Empty;
 		}
+
+		public override sealed bool Execute ()
+		{
+			if (this.ShouldExecuteRemotely (SessionId))
+				return new TaskRunner (SessionId, BuildEngine4).RunAsync (this).Result;
+			return ExecuteLocally ();
+		}
+
+		protected abstract bool ExecuteLocally ();
+
+		public virtual IEnumerable<ITaskItem> GetAdditionalItemsToBeCopied () => Enumerable.Empty<ITaskItem> ();
+
+		public virtual bool ShouldCopyToBuildServer (ITaskItem item) => false;
+
+		public virtual bool ShouldCreateOutputFile (ITaskItem item) => false;
+
+		public virtual void Cancel ()
+		{
+			if (ShouldExecuteRemotely ())
+				BuildConnection.CancelAsync (BuildEngine4).Wait ();
+		}
 	}
 }