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import java.lang.reflect.Method;

/*

A simple aspect-oriented mechanism that supports

the basic AOP feature of applying before/after/around

advice on selected methods of objects that implement

specific interfaces.

The mechanism employs runtime aspect weaving

implemented through the dynamic proxy API.

*/

public interface Aspect {

/*

Returns the array of Interfaces

that this aspect should be applied upon

*/

Class<?>[] getTargets();

/*

Returns the Runnable, if any,

that should be run as before advice for the given method

*/

Runnable beforeAdviceFor(Method method);

/*

Returns the Runnable, if any,

that should be run as after advice for the given method

*/

Runnable afterAdviceFor(Method method);

/*

Returns the Runnable, if any,

that should be run as before advice for the given method

*/

Runnable aroundAdviceFor(Method method);

/* The Aspect builder */

interface Builder {

Builder withTargets(Class<?>[] targets);

Builder withBeforeAdviceFor(Runnable beforeAdvice, Method... methods);

Builder withAfterAdviceFor(Runnable afterAdvice, Method... methods);

Builder withAroundAdviceFor(Runnable aroundAdvice, Method... methods);

Aspect build();

}

/* The Aspect weaver */

interface Weaver {

Object weave(Object target);

}

/* Helper Factory */

interface Factory {

Builder newBuilder();

Weaver newWeaver();

}

}