From adf7725618fcd5962cce2be93d8c16bd0a98ba2b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=B4=A2=E6=82=9F?=
 <32218468+ljh19971113@users.noreply.github.com>
Date: Fri, 30 Apr 2021 14:48:38 +0800
Subject: [PATCH] Remove the useless resetClassFileTransformer in Enhancer
 (#1786)

---
 .../taobao/arthas/core/advisor/Enhancer.java  | 27 +++++--------------
 1 file changed, 7 insertions(+), 20 deletions(-)

diff --git a/core/src/main/java/com/taobao/arthas/core/advisor/Enhancer.java b/core/src/main/java/com/taobao/arthas/core/advisor/Enhancer.java
index 4076f44f2..4cd05774d 100644
--- a/core/src/main/java/com/taobao/arthas/core/advisor/Enhancer.java
+++ b/core/src/main/java/com/taobao/arthas/core/advisor/Enhancer.java
@@ -442,16 +442,8 @@ public class Enhancer implements ClassFileTransformer {
             }
         }
 
-        final ClassFileTransformer resetClassFileTransformer = new ClassFileTransformer() {
-            @Override
-            public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
-                    ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
-                return null;
-            }
-        };
-
         try {
-            enhance(inst, resetClassFileTransformer, enhanceClassSet);
+            enhance(inst, enhanceClassSet);
             logger.info("Success to reset classes: " + enhanceClassSet);
         } finally {
             for (Class<?> resetClass : enhanceClassSet) {
@@ -464,18 +456,13 @@ public class Enhancer implements ClassFileTransformer {
     }
 
     // 批量增强
-    private static void enhance(Instrumentation inst, ClassFileTransformer transformer, Set<Class<?>> classes)
+    private static void enhance(Instrumentation inst, Set<Class<?>> classes)
             throws UnmodifiableClassException {
-        try {
-            inst.addTransformer(transformer, true);
-            int size = classes.size();
-            Class<?>[] classArray = new Class<?>[size];
-            arraycopy(classes.toArray(), 0, classArray, 0, size);
-            if (classArray.length > 0) {
-                inst.retransformClasses(classArray);
-            }
-        } finally {
-            inst.removeTransformer(transformer);
+        int size = classes.size();
+        Class<?>[] classArray = new Class<?>[size];
+        arraycopy(classes.toArray(), 0, classArray, 0, size);
+        if (classArray.length > 0) {
+            inst.retransformClasses(classArray);
         }
     }
 }