如何仅匹配一次类型或方法注释

Question

我想要一个 Guice 拦截器来拦截对带注释的 class 或带注释的方法的调用。我希望能够将两者结合起来，即。使用具有不同属性的方法注释覆盖 class 注释。

我是这样工作的：

// Intercept all METHODS annotated with @MyAnnotation
bindInterceptor(
    Matchers.any(),
    Matchers.annotatedWith(company.MyAnnotation),
    new TracingInterceptor());

// Intercept all methods in CLASSES annotated with @MyAnnotation
bindInterceptor(
    Matchers.annotatedWith(company.MyAnnotation),
    Matchers.any(),
    new TracingInterceptor());

然而，当我这样注释 class 时：

@MyAnnotation    
class MyClass {
    @MyAnnotation
    public void myMethod() {}
}

拦截器被调用了两次，这很糟糕！

有什么方法可以避免两次触发拦截器，但具有相同的行为？

Answer 1

您可以通过使活页夹互斥来实现此目的，如下所示：

// Intercept all METHODS annotated with @MyAnnotation in classes not annotated with @MyAnnotation
bindInterceptor(
    Matchers.not(Matchers.annotatedWith(company.MyAnnotation)),
    Matchers.annotatedWith(company.MyAnnotation),
    new TracingInterceptor());

// Intercept all methods not annotated with @MyAnnotation in CLASSES annotated with @MyAnnotation
bindInterceptor(
    Matchers.annotatedWith(company.MyAnnotation),
    Matchers.not(Matchers.annotatedWith(company.MyAnnotation)),
    new TracingInterceptor());

// Intercept all METHODS not annotated with @MyAnnotation in CLASSES annotated with @MyAnnotation
bindInterceptor(
    Matchers.annotatedWith(company.MyAnnotation),
    Matchers.annotatedWith(company.MyAnnotation),
    new TracingInterceptor());

如何仅匹配一次类型或方法注释

How to match on type OR method annotation only once

aop

guice

interceptor