@Bean
    @ConditionalOnMissingBean(HttpLongPollingDataChangedListener.class)
    public HttpLongPollingDataChangedListener httpLongPollingDataChangedListener(final HttpSyncProperties httpSyncProperties) {
        LOG.info("you use http long polling sync");
        return new HttpLongPollingDataChangedListener(httpSyncProperties);
    }
httpLongPollingDataChangedListener.

@param httpSyncProperties httpSyncProperties
@return {@link HttpLongPollingDataChangedListener}
shenyu-admin/src/main/java/org/apache/shenyu/admin/config/HttpLongPollingSyncConfiguration.java