AbstractAspectJAdvice.java 文件源码

/**
 * Lazily instantiate joinpoint for the current invocation.
 * Requires MethodInvocation to be bound with ExposeInvocationInterceptor.
 * <p>Do not use if access is available to the current ReflectiveMethodInvocation
 * (in an around advice).
 * @return current AspectJ joinpoint, or through an exception if we're not in a
 * Spring AOP invocation.
 */
public static JoinPoint currentJoinPoint() {
    MethodInvocation mi = ExposeInvocationInterceptor.currentInvocation();
    if (!(mi instanceof ProxyMethodInvocation)) {
        throw new IllegalStateException("MethodInvocation is not a Spring ProxyMethodInvocation: " + mi);
    }
    ProxyMethodInvocation pmi = (ProxyMethodInvocation) mi;
    JoinPoint jp = (JoinPoint) pmi.getUserAttribute(JOIN_POINT_KEY);
    if (jp == null) {
        jp = new MethodInvocationProceedingJoinPoint(pmi);
        pmi.setUserAttribute(JOIN_POINT_KEY, jp);
    }
    return jp;
}