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这里是我的用例:我有一个类有多个方法,我想拦截,但我不想拦截这个类的所有方法。我想使用同一个拦截器类的不同实例来实现这一点。当我尝试这样做时,我看到了Byte Buddy无法理解的行为。我很确定这是我不明白的事情和/或我做错了什么,但我很难过。我使用的是Byte Buddy 1.6.9。多重方法拦截和拦截器重用
I类要拦截其方法:
public class MyClass
{
private Logger logger = LoggerFactory.getLogger(this.getClass().getName());
public void firstInterceptedMethod()
{
logger.info("firstInterceptedMethod");
}
public void secondInterceptedMethod()
{
logger.info("secondInterceptedMethod");
}
public void notInterceptedMethod()
{
logger.info("notInterceptedMethod");
}
}
拦截类:
public class MyInterceptor
{
private Logger logger = LoggerFactory.getLogger(this.getClass().getName());
private final UUID identifier = UUID.randomUUID();
@RuntimeType
public Object methodCalled(@SuperCall Callable<?> superCall, @Origin Method method) throws Exception
{
logger.info("methodCalled: identifier: " + identifier);
logger.info("methodCalled: method name: " + method.getName());
return superCall.call();
}
}
字节好友测试/仪器:
public class MyTest
{
@Test
public void test() throws Exception
{
MyInterceptor firstMethodInterceptor = new MyInterceptor();
MyInterceptor secondMethodInterceptor = new MyInterceptor();
MyClass myClass = new ByteBuddy().subclass(MyClass.class)
.method(ElementMatchers.named("firstInterceptedMethod"))
.intercept(MethodDelegation.to(firstMethodInterceptor))
.method(ElementMatchers.named("secondInterceptedMethod"))
.intercept(MethodDelegation.to(secondMethodInterceptor))
.make()
.load(MyClass.class.getClassLoader())
.getLoaded()
.newInstance();
myClass.firstInterceptedMethod();
myClass.secondInterceptedMethod();
}
}
输出:
04/20/2017 08:27:26:600 AM [main] bytebuddy.test.MyInterceptor methodCalled : INFO methodCalled: identifier: 04124951-f865-4815-8bd4-0b10c0c816a2
04/20/2017 08:27:26:600 AM [main] bytebuddy.test.MyInterceptor methodCalled : INFO methodCalled: identifier: 04124951-f865-4815-8bd4-0b10c0c816a2
04/20/2017 08:27:26:613 AM [main] bytebuddy.test.MyInterceptor methodCalled : INFO methodCalled: method name: firstInterceptedMethod
04/20/2017 08:27:26:613 AM [main] bytebuddy.test.MyInterceptor methodCalled : INFO methodCalled: method name: firstInterceptedMethod
04/20/2017 08:27:26:614 AM [main] bytebuddy.test.MyClass firstInterceptedMethod : INFO firstInterceptedMethod
04/20/2017 08:27:26:614 AM [main] bytebuddy.test.MyInterceptor methodCalled : INFO methodCalled: identifier: 79590462-b87d-4125-9e87-5481e1062b05
04/20/2017 08:27:26:614 AM [main] bytebuddy.test.MyInterceptor methodCalled : INFO methodCalled: identifier: 79590462-b87d-4125-9e87-5481e1062b05
04/20/2017 08:27:26:614 AM [main] bytebuddy.test.MyInterceptor methodCalled : INFO methodCalled: method name: secondInterceptedMethod
04/20/2017 08:27:26:614 AM [main] bytebuddy.test.MyInterceptor methodCalled : INFO methodCalled: method name: secondInterceptedMethod
04/20/2017 08:27:26:614 AM [main] bytebuddy.test.MyClass secondInterceptedMethod : INFO secondInterceptedMethod
我的问题是:为什么我看到每个拦截器被调用两次?当调用第一个方法时,第一个拦截器实例似乎被调用两次,我不明白为什么会这样。与第二种方法类似的行为,只有第二个拦截器实例似乎被调用两次。我希望拦截器只能在拦截方法调用时调用一次。
如果我做这样的事情:
FirstMethodInterceptor firstMethodInterceptor = new FirstMethodInterceptor();
SecondMethodInterceptor secondMethodInterceptor = new SecondMethodInterceptor();
然后我看到了我所期望的行为;即每个拦截器仅在每个拦截的方法中被调用一次。我希望避免这种情况,因为我希望能够在不看到这种行为的情况下重用“通用”拦截器。 Insight将非常感谢,谢谢。