@Override
    public SystemInfoResult getSystemInfo(final Map<String, String> params) {
        // Let the caller specify the feed to inspect. Too much info for each feed store
        // to show it all
        return Optional.ofNullable(params.get(PARAM_NAME_FEED))
                .map(feedName ->
                        Optional.ofNullable(feedNameToStoreMap.get(feedName))
                                .map(RefDataOffHeapStore::getSystemInfo)
                                .orElseGet(() -> SystemInfoResult.builder(this)
                                        .build()))
                .orElseGet(this::getSystemInfo);
    }
Get all ref stores keyed by feed name

@return Map of feedName => {@link RefDataOffHeapStore}
stroom-pipeline/src/main/java/stroom/pipeline/refdata/store/offheapstore/DelegatingRefDataOffHeapStore.java