channelManager.findOrCreateProducer = function (topic, options, unusedChannelTimeoutMs) {
let channel = producersByTopic[topic];
if (channel) return channel;
options = options ? options : {};
channel = producersByTopic[topic] = channelManager.createRawProducer(topic, options);
let unusedChannelTimeout;
channelManager.emit(channelManager.PRODUCER_NEW_TOPIC_EVENT, topic);
channel.publish_ = channel.publish;
channel.publish = function (message, cb) {
clearTimeout(unusedChannelTimeout);
if (unusedChannelTimeoutMs) {
unusedChannelTimeout = setTimeout(onUnusedChannelTimeout, unusedChannelTimeoutMs);
}
channel.publish_(message, function (err) {
if (err) return cb(err);
channelManager.emit(channelManager.PRODUCER_NEW_MESSAGE_EVENT, topic);
cb();
});
};
function onUnusedChannelTimeout() {
removeProducer(channel, topic);
}
return channel;
};