docs: public long getDepth()
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.entry(tc, "getDepth");
      Iterator streams = null;
      try
      {
        streams = streamSet.iterator();
      }
      catch (SIResourceException e)
      {
        FFDCFilter.processException(
            e,
            "com.ibm.ws.sib.processor.runtime.TargetStreamSetControl.getDepth",
            "1:432:1.16",
            this);
        
          SIMPRuntimeOperationFailedException finalE =
            new SIMPRuntimeOperationFailedException(
              nls.getFormattedMessage(
                "INTERNAL_MESSAGING_ERROR_CWSIP0002",
                new Object[] {"TargetStreamSetControl.getDepth",
                    "1:440:1.16",
                              e},
                null), e);
              
          SibTr.exception(tc, finalE);
  //        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(tc, "getDepth", finalE);
  //        throw finalE;
      }
      long depth = 0;
      while(streams.hasNext())
      {
        TargetStream streamControl = (TargetStream)streams.next();
        depth += streamControl.getAllMessagesOnStream().size();  
      }
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.exit(tc, "getDepth", new Long(depth));
      return depth;
    }