Thruway\Call::getInvocationRequestId PHP Method

    public function getInvocationRequestId()
    {
        return $this->invocationRequestId;
    }

 /**
  * Process call
  *
  * @param \Thruway\Session $session
  * @param \Thruway\Message\CallMessage $msg
  * @return boolean
  */
 private function processCall(Session $session, CallMessage $msg)
 {
     if (!Utils::uriIsValid($msg->getProcedureName())) {
         $session->sendMessage(ErrorMessage::createErrorMessageFromMessage($msg, 'wamp.error.invalid_uri'));
         return;
     }
     if (!isset($this->procedures[$msg->getProcedureName()])) {
         $session->sendMessage(ErrorMessage::createErrorMessageFromMessage($msg, 'wamp.error.no_such_procedure'));
         return;
     }
     /* @var $procedure \Thruway\Procedure */
     $procedure = $this->procedures[$msg->getProcedureName()];
     $call = new Call($session, $msg, $procedure);
     $this->callInvocationIndex[$call->getInvocationRequestId()] = $call;
     $this->callRequestIndex[$msg->getRequestId()] = $call;
     $keepIndex = $procedure->processCall($session, $call);
     if (!$keepIndex) {
         $this->removeCall($call);
     }
 }