docs: public List getSubscriptionList()
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.entry(tc, "getSubscriptionList");
  
      List list;
      HashMap durableSubs = destinationManager.getDurableSubscriptionsTable();
  
      synchronized (durableSubs)
      {
        list = new ArrayList(durableSubs.keySet());
      }
  
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.exit(tc, "getSubscriptionList", list);
  
      return list;
    }