public Set<String> getCachedConnections() {
        synchronized (connectionContainers) {
            return connectionContainers.keySet();
        }
    }
@return set of connection-urls the CachedPlcConnectionManager is currently managing.
plc4j/tools/connection-cache/src/main/java/org/apache/plc4x/java/utils/cache/CachedPlcConnectionManager.java