docs: public long getAvailableMessageCount()
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.entry(tc, "getAvailableMessageCount");
        
      long returnValue = -1;
      try
      {
        returnValue = getStatistics().getAvailableItemCount();
      }
      catch(MessageStoreException e)
      {
        // FFDC
        FFDCFilter.processException(
            e,
            "com.ibm.ws.sib.processor.impl.store.itemstreams.PtoPMessageItemStream.getAvailableMessageCount",
            "1:863:1.93.1.14",
            this);  
        
        SibTr.exception(tc, e);
      } 
        
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.exit(tc, "getAvailableMessageCount", new Long(returnValue));  
      return returnValue;    
    }