base for discussion

runtime/bundles/org.eclipse.e4.core.di/src/org/eclipse/e4/core/internal/di/JfrDiEvent.java

@@ -0,0 +1,28 @@
+package org.eclipse.e4.core.internal.di;
+
+import jdk.jfr.Category;
+import jdk.jfr.Event;
+import jdk.jfr.Label;
+import jdk.jfr.Name;
+import jdk.jfr.StackTrace;
+
+@Name("DIEvent")
+@Label("Inject")
+@Category({ "Eclipse", "Platform", "DI" })
+@StackTrace(false)
+public class JfrDiEvent extends Event {
+
+	@Label("target")
+	String target;
+
+	@Label("arguments")
+	String arguments;
+
+	public static final ThreadLocal<JfrDiEvent> EVENT = new ThreadLocal<>() {
+		@Override
+		protected JfrDiEvent initialValue() {
+			return new JfrDiEvent();
+		}
+	};
+
+}

runtime/bundles/org.eclipse.e4.core.di/src/org/eclipse/e4/core/internal/di/MethodRequestor.java

@@ -17,6 +17,7 @@
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.lang.reflect.Type;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Map;
 import java.util.WeakHashMap;
@@ -54,6 +55,12 @@ public Object execute() throws InjectionException {
 			primarySupplier.pauseRecording();
 			pausedRecording = true;
 		}
+		ThreadLocal<JfrDiEvent> jfrDIEvent = JfrDiEvent.EVENT;
+		if (jfrDIEvent.get().isEnabled()) {
+			jfrDIEvent.get().target = this.toString();
+			jfrDIEvent.get().arguments = Arrays.toString(actualArgs);
+			jfrDIEvent.get().begin();
+		}
 		try {
 			result = location.invoke(userObject, actualArgs);
 		} catch (IllegalArgumentException | IllegalAccessException e) {
@@ -70,6 +77,10 @@ public Object execute() throws InjectionException {
 			if (pausedRecording)
 				primarySupplier.resumeRecording();
 			clearResolvedArgs();
+			if (jfrDIEvent.get().isEnabled()) {
+				jfrDIEvent.get().end();
+				jfrDIEvent.get().commit();
+			}
 		}
 		return result;
 	}