public void requestSent(final BOSHMessageEvent event) {
        if (requests == null) {
            requests = new CopyOnWriteArrayList<Node>();
        }
        outstandingRequests.add(event.getBody());
        Node node = new Node(
                System.currentTimeMillis(),
                event.getBody(),
                lastRequestResponded.get());
        requests.add(node);
    }