@Override
    public void registerSingleLogoutServiceMessageHandler(final SingleLogoutServiceMessageHandler handler) {
        if (BeanSupplier.isNotProxy(handler)) {
            LOGGER.trace("Registering single logout service message handler [{}]", handler.getName());
            singleLogoutServiceMessageHandlers.add(handler);
            AnnotationAwareOrderComparator.sort(this.singleLogoutServiceMessageHandlers);
        }
    }
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