In the preceding example we used a field, `callStartNanos`, to track the elapsed time of each event. This is handy, but it won’t work if multiple calls are executing concurrently. To accommodate this, use a `Factory` to create a new `EventListener` instance for each `Call`. This allows each listener to keep call-specific state.

        this.context = context;
        this.baseLeaseManager = leaseManager;
        this.directoryCache = new ConcurrentHashMap<>();
        this.leaseToPath = new ConcurrentHashMap<>();
        this.scheduler = Executors.newScheduledThreadPool(1);
        this.changeNotifier = new DirectoryChangeNotifier(this);

        // Schedule periodic cache cleanup

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