docs: synchronized void add(ConsumerSessionImpl consumer)
    {
      consumer.setId(_consumerCount);
      
      if (tc.isEntryEnabled())
        SibTr.entry(tc, "add", new Long(consumer.getIdInternal()) );
  
      _consumers.put(new Long(_consumerCount), consumer);
  
      _consumerCount++;
  
      if (tc.isEntryEnabled())
        SibTr.exit(tc, "add");
    }