Excessive number of ams.gen queues created

Is any one know why there is so many ams.gen*!
my code is below:

```
const Config = require('../config');

const jackrabbit = require('jackrabbit');
const url = Config.get('mq.' + moduleName + '.url');
const queueName = Config.get('mq.' + moduleName + '.queue');
const routeKey = Config.get('mq.' + moduleName + '.key');
const exchangeName = Config.get('mq.' + moduleName + '.exchange');
const module_rabbit = jackrabbit(url);

const moduleExchange = module_rabbit.direct(exchangeName);

console.log("module:", moduleName, ", url:", url, ", queue:", queueName);

moduleExchange.queue({
name: queueName,
key: routeKey,
persistent: true
});

function publish(message) {
return moduleExchange.publish(message, {
name: queueName,
key: routeKey,
persistent: true
})
}
```