wallezhang commented on a change in pull request #6918:
URL: https://github.com/apache/skywalking/pull/6918#discussion_r628873597



##########
File path: 
apm-sniffer/apm-sdk-plugin/pulsar-plugin/src/main/java/org/apache/skywalking/apm/plugin/pulsar/MessageConstructorInterceptor.java
##########
@@ -34,6 +35,12 @@
 
     @Override
     public void onConstruct(EnhancedInstance objInst, Object[] allArguments) {
-        objInst.setSkyWalkingDynamicField(new MessageEnhanceRequiredInfo());
+        final Object msgArgument = allArguments[2];
+        if (objInst instanceof TopicMessageImpl && msgArgument instanceof 
EnhancedInstance) {

Review comment:
       The enhanced class is an interface, I want to enhance all the 
implementation classes, but some of them are used for wrapping other 
implementation, so they are only distinguished by the parameters of the 
constructor instead of using another instrumentation definitions.




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