我已经为kafka客户机和生产者创建了singleton类，以便只创建一个对象。我需要多次发布相同的主题，而不创建新的客户端和生产者示例。我发现producer.on（'ready'，fn（）{}）不是使用同一个客户机和producer示例触发的，只是在我有新的客户机和producer对象时第一次触发。
下面是示例代码：
单例类：

const kafka = require('kafka-node');
const logger = require('./../../../../applogger');
const kafkaConfig = require('./../../../../config/config');

function ConnectionProvider() {
    let kafkaConnection = undefined;
    let client = undefined;

    this.getConnection = () => {

        if (!this.kafkaConnection) {
            logger.info("Creating new kafka connection ------------------------------------- ");
            this.client = new kafka.Client(kafkaConfig.ZOOKPER_HOST);
            this.kafkaConnection = new kafka.Producer(this.client);
        }
        return this.kafkaConnection;
    };
    this.getClient = () => {
        if (!this.client) {
            logger.info("Creating new kafka Client ------------------------------------- ");
            this.client = new kafka.Client(kafkaConfig.ZOOKPER_HOST);
        }
        return this.client;

    }
    process.on('SIGINT', function() {
        logger.info("Going to terminate kafka connection...!");
        process.exit(0);
    });
}
module.exports = exports = new ConnectionProvider;

主题发布方法：

const kafkaClient = require('./../core/kafkaConnection');

    const publishToKafka = function(dataPayload, callback) {
        logger.debug('Publishing to topic ', topicName, ' with data: ', dataPayload);
        let producer = kafkaClient.getConnection();

        producer.on('ready', function() {
            let payloads = dataPayload;
            producer.send(payloads, function(err, data) {
                if (err) {
                    logger.error(
                        'Error in publishing message to messaging pipeline ', err
                    );
                    callback(err, null);
                    return;
                }

                logger.debug('Published message to messaging pipeline topic ', topicName, ' with result: ', data);

                callback(null, data);
                return;
            });
        });

        producer.on('error', function(err) {
            logger.error(
                'Error in publishing message to messaging pipeline ', err
            );
            producer.close();
        });

    };

datapayload为：let datapayload=[{topic:sometopic,message:somemessage}]
我需要多次调用publishtokafka方法，但只想创建一个kafka客户机和生产者示例。但是producer没有发布主题，因为producer.on（'ready'，function（）{}）在使用客户机和producer的同一对象时没有触发。
提前谢谢。