Btukfyl

I want to have a Guice interceptor that intercepts calls either to a class that is annotated, or a method that is annotated. I'd like to be able to combine both, ie. override the class annotation with a method annotation with different properties.

I have this working like this:

// 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());

However when I annotate a class like this:

@MyAnnotation    

class MyClass {

    @MyAnnotation

    public void myMethod() {}

}

The interceptor gets called twice, which is bad!

Is there any way to avoid triggering the interceptor twice, but having the same behaviour?

You can achieve this by making your binders mutually exclusive, like this:

// 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());