code: public boolean isOutOfResources()
      {
          boolean out =
              getThreads()==getMaxThreads() &&
              getIdleThreads()==0;
          
          if (out && !_isOut)
          {
              log.warn("OUT OF THREADS: "+this);
              _warned=System.currentTimeMillis();
              _isLow=true;
              _isOut=true;
          }
          
          return out;
      }
docs: /*
  @see org.browsermob.proxy.jetty.http.HttpListener#isOutOfResources()