determine the routing key used for this message . this can be derived based on the incoming tuple or a fixed value . default implementation provides no routing key . concode_field_sep PlaceHolder placeHolder concode_field_sep void prepare concode_elem_sep String specifyContentEncoding concode_elem_sep boolean specifyMessagePersistence concode_elem_sep Message produceMessage concode_elem_sep String determineExchangeName concode_elem_sep Map<String,Object> specifyHeaders concode_elem_sep String specifyContentType concode_elem_sep byte[] extractBody
String function ( Tuple arg0 ) { return "srini_string" ; }