gistfile1.java

List pendingVisits = new LinkedList<>();
    Long pendingVisitsRefreshTime = 0L;

    public List getPendingVisits() throws QmaticClientException {
        Long currentTime = new Date().getTime();
        if (!this.pendingVisits.isEmpty() && (currentTime - pendingVisitsRefreshTime <= 10000))
            return this.pendingVisits;
        this.pendingVisits.clear();

        List<VisitInfo> pendingVisitsForCurrentWS = new ArrayList<>();
        List<VisitInfo> pendingVisitsForOthersWS = new ArrayList<>();

        try {
            List<Queue> activeQueues = this.qmaticClient.getCurrentStats(this.getCurrentWorkstationInfo().getBranchId());
            for (Queue activeQueue : activeQueues) {
                List<VisitInfo> queuePendingVisits = activeQueue.getPendingVisits();
                if (queuePendingVisits != null) {
                    for (VisitInfo pendingVisit : queuePendingVisits)
                        if (this.getCurrentWorkstationInfo().getWorkstationId().equals(pendingVisit.getDesignatedWorkstationId()))
                            pendingVisitsForCurrentWS.add(pendingVisit);
                        else
                            pendingVisitsForOthersWS.add(pendingVisit);
                }
            }
        } catch (NullPointerException ignored) {
        }

        Collections.sort(pendingVisitsForCurrentWS, new VisitInfoEnqueuedTimeComparator()); // sort by waiting time
        Collections.sort(pendingVisitsForOthersWS, new VisitInfoEnqueuedTimeComparator()); // sort by waiting time

        if (8 <= pendingVisitsForCurrentWS.size() + pendingVisitsForCurrentWS.size())
            this.pendingVisits = ListUtils.union(pendingVisitsForCurrentWS, pendingVisitsForOthersWS).subList(0, 8);
        else
            this.pendingVisits = ListUtils.union(pendingVisitsForCurrentWS, pendingVisitsForOthersWS);
        pendingVisitsRefreshTime = currentTime;

        return this.pendingVisits;
    }