org.noear.wood.utils.InvocationHandlerUtils Maven / Gradle / Ivy
package org.noear.wood.utils;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
/**
* @author noear 2022/10/15 created
*/
public class InvocationHandlerUtils {
/**
* java16+ 支持调用default method的方法
*/
private static Method invokeDefaultMethod = null;
static {
//
//JDK16+ 新增InvocationHandler.invokeDefault()
//
if (JavaUtils.JAVA_MAJOR_VERSION >= 16) {
// https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8253870
Method[] ms = InvocationHandler.class.getMethods();
for (Method call : ms) {
if ("invokeDefault".equals(call.getName())) {
invokeDefaultMethod = call;
break;
}
}
if (invokeDefaultMethod == null) {
//不可能发生
throw new UnsupportedOperationException("The current java " + JavaUtils.JAVA_MAJOR_VERSION + " is not found: invokeDefault");
}
}
}
/**
* 在代理模式下调用接口的默认的函数
*/
public static Object invokeDefault(Object proxy, Method method, Object[] args) throws Throwable {
// https://dzone.com/articles/correct-reflective-access-to-interface-default-methods
// https://gist.github.com/lukaseder/f47f5a0d156bf7b80b67da9d14422d4a
if (JavaUtils.JAVA_MAJOR_VERSION <= 15) {
final Constructor constructor = MethodHandles.Lookup.class
.getDeclaredConstructor(Class.class);
constructor.setAccessible(true);
final Class clazz = method.getDeclaringClass();
return constructor.newInstance(clazz)
.in(clazz)
.unreflectSpecial(method, clazz)
.bindTo(proxy)
.invokeWithArguments(args);
} else {
Method invoke = invokeDefaultMethod;
return invoke.invoke(null, proxy, method, args);
}
}
/**
* 在代理模式下调用 Object 的默认的函数
*/
public static Object invokeObject(Class interfaceClz, Object proxy, Method method, Object[] args) {
String name = method.getName();
switch (name) {
case "toString":
return interfaceClz.getName() + ".$Proxy";
case "hashCode":
return System.identityHashCode(proxy);
case "equals":
return proxy == args[0];
default:
throw new UnsupportedOperationException("Unsupported operation: " + interfaceClz.getName() + "::" + method.getName());
}
}
}