AOP：在一个切入点中支持@Annotation和@Indit

Question

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
public @interface TestAspectAnnotation {
    String[] tags() default {};
}

@Around(value = "@annotation(annotation) || @within(annotation)", argNames = "pjp,annotation")
public Object testAdvice(ProceedingJoinPoint pjp,
                         TestAspectAnnotation annotation) throws Throwable {

        String[] tags = annotation.tags();

        Stopwatch stopwatch = Stopwatch.createStarted();
        Object proceed = pjp.proceed();
        stopwatch.stop();
        long executionTime = stopwatch.elapsed(TimeUnit.MILLISECONDS);

        sendMetrics(tags, executionTime);

        return proceed;

    }

是否有一种方法可以在类级和方法级同时提供单一的切入点和建议来支持注释？

Answer 1

有没有办法有一个单一的切入点和建议

我最近也遇到了类似的问题，尝试了各种选择，但都无济于事。最后，我将“or”切入点拆分为两个独立的切入点，并从两个建议中调用相同的方法。

我已经建立了一个小的演示项目来说明我已经建立的工作解决方案。我希望这会对你有所帮助：

@Component
@Aspect
public class SomeAspect {
    @Around(value = "@within(annotation)", argNames = "pjp,annotation")
    public Object methodAdvice(ProceedingJoinPoint pjp, SomeAnnotation annotation) throws Throwable {
        return logTags(pjp, annotation);
    }

    @Around(value = "@annotation(annotation)", argNames = "pjp,annotation")
    public Object classAdvice(ProceedingJoinPoint pjp, SomeAnnotation annotation) throws Throwable {
        return logTags(pjp, annotation);
    }

    private Object logTags(ProceedingJoinPoint pjp, SomeAnnotation annotation) throws Throwable {
        Stream.of(annotation.tags()).forEach(System.out::println);
        return pjp.proceed();
    }
}

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
public @interface SomeAnnotation {
    String[] tags() default {};
}

@Service
@SomeAnnotation(tags = {"c", "d"})
public class SomeService {
    @SomeAnnotation(tags = {"a", "b"})
    public void test() {
    }
}

@SpringBootApplication
public class Application implements ApplicationRunner {
    @Autowired private SomeService someService;

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        someService.test();
    }
}