Update the custom processor project (#996)

* update the processor project

* simply code

Co-authored-by: Cijo Thomas <cithomas@microsoft.com>

docs/trace/building-your-own-processor/MyActivityProcessor.cs

@@ -22,29 +22,37 @@ using OpenTelemetry.Trace;
 
 internal class MyActivityProcessor : ActivityProcessor
 {
-    public MyActivityProcessor()
+    private readonly string name;
+
+    public MyActivityProcessor(string name)
     {
+        this.name = name;
+    }
+
+    public override string ToString()
+    {
+        return $"{this.GetType()}({this.name})";
     }
 
     public override void OnStart(Activity activity)
     {
-        Console.WriteLine($"{this.GetType()} OnStart");
+        Console.WriteLine($"{this}.OnStart");
     }
 
     public override void OnEnd(Activity activity)
     {
-        Console.WriteLine($"{this.GetType()} OnEnd");
+        Console.WriteLine($"{this}.OnEnd");
     }
 
     public override Task ForceFlushAsync(CancellationToken cancellationToken)
     {
-        Console.WriteLine($"{this.GetType()} ForceFlushAsync");
+        Console.WriteLine($"{this}.ForceFlushAsync");
         return Task.CompletedTask;
     }
 
     public override Task ShutdownAsync(CancellationToken cancellationToken)
     {
-        Console.WriteLine($"{this.GetType()} ShutdownAsync");
+        Console.WriteLine($"{this}.ShutdownAsync");
         return Task.CompletedTask;
     }
 }

docs/trace/building-your-own-processor/Program.cs

@@ -27,10 +27,12 @@ public class Program
     {
         using var otel = Sdk.CreateTracerProvider(b => b
             .AddActivitySource("MyCompany.MyProduct.MyLibrary")
-            .AddProcessorPipeline(pipeline =>
-            {
-                pipeline.AddProcessor(current => new MyActivityProcessor());
-            }));
+
+            // TODO: seems buggy if you remove A and B here, MyActivityProcessor(C).OnEnd is not called.
+            // TODO: should the dispose order be C, B, A or A, B C?
+            .AddProcessorPipeline(p => p.AddProcessor(current => new MyActivityProcessor("A")))
+            .AddProcessorPipeline(p => p.AddProcessor(current => new MyActivityProcessor("B")))
+            .AddProcessorPipeline(p => p.AddProcessor(current => new MyActivityProcessor("C"))));
 
         using (var activity = MyActivitySource.StartActivity("SayHello"))
         {