@Override
    protected void doRemoveListener(final String removeKey) {
        final ConfigFileChangeListener configFileChangeListener = watchCache.get(removeKey);
        if (Objects.nonNull(configFileChangeListener)) {
            final ConfigFile configFile = configFileService.getConfigFile(polarisConfig.getNamespace(), polarisConfig.getFileGroup(), removeKey);
            configFile.removeChangeListener(configFileChangeListener);
        }
    }
The type Polaris sync data service.
shenyu-sync-data-center/shenyu-sync-data-polaris/src/main/java/org/apache/shenyu/sync/data/polaris/PolarisSyncDataService.java