DefaultMBeanServerInterceptor.java 文件源码

private static <T extends NotificationBroadcaster>
        T getNotificationBroadcaster(ObjectName name, Object instance,
                                     Class<T> reqClass) {
    if (reqClass.isInstance(instance))
        return reqClass.cast(instance);
    if (instance instanceof DynamicMBean2)
        instance = ((DynamicMBean2) instance).getResource();
    if (reqClass.isInstance(instance))
        return reqClass.cast(instance);
    final RuntimeException exc =
        new IllegalArgumentException(name.getCanonicalName());
    final String msg =
        "MBean " + name.getCanonicalName() + " does not " +
        "implement " + reqClass.getName();
    throw new RuntimeOperationsException(exc, msg);
}