question: add a message header . message headers can be sent with any message and will be accessible with io.vertx.core.eventbus.message #headers at the recipient . concode_field_sep MultiMap headers concode_elem_sep long DEFAULT_TIMEOUT concode_elem_sep long timeout concode_elem_sep String codecName concode_field_sep DeliveryOptions setSendTimeout concode_elem_sep DeliveryOptions setHeaders concode_elem_sep long getSendTimeout concode_elem_sep DeliveryOptions setCodecName concode_elem_sep MultiMap getHeaders concode_elem_sep void checkHeaders concode_elem_sep String getCodecName
target: DeliveryOptions function ( String arg0 , String arg1 ) { checkHeaders ( ) ; Objects . requireNonNull ( arg0 , "srini_string" ) ; Objects . requireNonNull ( arg1 , "srini_string" ) ; headers . add ( arg0 , arg1 ) ; return this ; }