code: public void onServletInvocation (@Nonnull final Class <? extends GenericServlet> aServletClass)
    {
      m_aRWLock.writeLocked ( () -> _getOrCreateServletStatus (aServletClass).internalIncrementInvocationCount ());
    }
docs: Invoked at the beginning of a servlet invocation
  
  @param aServletClass
  Servlet class invoked. May not be <code>null</code>.