!241 使用MethodHandles.reflectAs代替原本的缓存反射

Merge pull request !241 from 阿超/3.0

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/toolkit/support/IdeaProxyLambdaMeta.java

@@ -18,7 +18,9 @@ package com.baomidou.mybatisplus.core.toolkit.support;
 import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
 import com.baomidou.mybatisplus.core.toolkit.ReflectionKit;
 
-import java.lang.reflect.Field;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Executable;
 import java.lang.reflect.InvocationHandler;
 import java.lang.reflect.Proxy;
 
@@ -28,21 +30,6 @@ import java.lang.reflect.Proxy;
  * Create by hcl at 2021/5/17
  */
 public class IdeaProxyLambdaMeta implements LambdaMeta {
-    private static final Field FIELD_MEMBER_NAME;
-    private static final Field FIELD_MEMBER_NAME_CLAZZ;
-    private static final Field FIELD_MEMBER_NAME_NAME;
-
-    static {
-        try {
-            Class<?> classDirectMethodHandle = Class.forName("java.lang.invoke.DirectMethodHandle");
-            FIELD_MEMBER_NAME = ReflectionKit.setAccessible(classDirectMethodHandle.getDeclaredField("member"));
-            Class<?> classMemberName = Class.forName("java.lang.invoke.MemberName");
-            FIELD_MEMBER_NAME_CLAZZ = ReflectionKit.setAccessible(classMemberName.getDeclaredField("clazz"));
-            FIELD_MEMBER_NAME_NAME = ReflectionKit.setAccessible(classMemberName.getDeclaredField("name"));
-        } catch (ClassNotFoundException | NoSuchFieldException e) {
-            throw new MybatisPlusException(e);
-        }
-    }
 
     private final Class<?> clazz;
     private final String name;
@@ -50,10 +37,10 @@ public class IdeaProxyLambdaMeta implements LambdaMeta {
     public IdeaProxyLambdaMeta(Proxy func) {
         InvocationHandler handler = Proxy.getInvocationHandler(func);
         try {
-            Object dmh = ReflectionKit.setAccessible(handler.getClass().getDeclaredField("val$target")).get(handler);
-            Object member = FIELD_MEMBER_NAME.get(dmh);
-            clazz = (Class<?>) FIELD_MEMBER_NAME_CLAZZ.get(member);
-            name = (String) FIELD_MEMBER_NAME_NAME.get(member);
+            MethodHandle dmh = (MethodHandle) ReflectionKit.setAccessible(handler.getClass().getDeclaredField("val$target")).get(handler);
+            Executable executable = MethodHandles.reflectAs(Executable.class, dmh);
+            clazz = executable.getDeclaringClass();
+            name = executable.getName();
         } catch (IllegalAccessException | NoSuchFieldException e) {
             throw new MybatisPlusException(e);
         }