@Override
    public void registerLogoutPostProcessor(final LogoutPostProcessor handler) {
        if (BeanSupplier.isNotProxy(handler)) {
            LOGGER.debug("Registering logout handler [{}]", handler.getName());
            logoutPostProcessors.add(handler);
            AnnotationAwareOrderComparator.sort(this.logoutPostProcessors);
        }
    }
This is {@link DefaultLogoutExecutionPlan}.

@author Misagh Moayyed
@since 5.1.0
core/cas-server-core-logout-api/src/main/java/org/apereo/cas/logout/DefaultLogoutExecutionPlan.java