class OnsProducer {
    static Logger log = LoggerFactory.getLogger(OnsProducer.class);

    OnsConfig config;
    Producer producer;

    public OnsProducer(OnsConfig config) {
        this.config = config;
    }

    private void init() {<FILL_FUNCTION_BODY>}

    public boolean publish(Event event, String topic) {
        init();
        //普通消息发送。
        Message message = MessageUtil.buildNewMessage(event, topic);
        //发送消息，需要关注发送结果，并捕获失败等异常。
        SendResult sendReceipt = producer.send(message);
        if (sendReceipt != null) {
            return true;
        } else {
            return false;
        }
    }
}

        if (producer != null) {
            return;
        }

        Utils.locker().lock();

        try {
            if (producer != null) {
                return;
            }
            producer = ONSFactory.createProducer(config.getProducerProperties());
            producer.start();

            log.debug("Ons producer started: " + producer.isStarted());

        } finally {
            Utils.locker().unlock();
        }
    
<no_super_class>