public String extensionTransformletDoTransform(@NonNull final ClassInfo classInfo) throws NotFoundException, CannotCompileException, IOException {
        final Map<String, TtlTransformlet> transformlets = classLoader2ExtensionTransformletsIncludeParentCL.get(classInfo.getClassLoader());
        if (transformlets == null) return null;

        for (Map.Entry<String, TtlTransformlet> entry : transformlets.entrySet()) {
            final String className = entry.getKey();
            final TtlTransformlet transformlet = entry.getValue();

            transformlet.doTransform(classInfo);
            if (classInfo.isModified()) {
                return className;
            }
        }

        return null;
    }
@author Jerry Lee (oldratlee at gmail dot com)
@since 3.0.0
ttl2-compatible/src/main/java/com/alibaba/ttl/threadpool/agent/TtlExtensionTransformletManager.java