private NodeList getNodeList(Application application) {
        if (serverGroupListFactory == null) {
            return NodeList.of();
        }
        Node query = new Node(application);
        ServerGroupList runningInstances = serverGroupListFactory.createWasNodeInstanceList(query, range.getTo());
        if (runningInstances.hasServerInstance()) {
            Node node = new Node(application);
            node.setServerGroupList(runningInstances);
            return NodeList.of(node);
        }
        return NodeList.of();
    }
@author emeroad
@author minwoo.jung
@author HyunGil Jeong
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/ApplicationMapBuilder.java