如何用MongoDB截取Grails中的连接事件

grails:
    mongodb:
        host: localhost
        port: 27017
        databaseName: your_database_name
        username: your_username
        password: your_password

dependencies {
    // 其他依赖...
    compile 'org.grails.plugins:mongodb:7.2.0'
}

import grails.events.ApplicationEventListener
import grails.events.Listener
import grails.mongodb.MongoDatastore

@Listener
class MongoDBConnectionListener implements ApplicationEventListener {

    MongoDatastore mongoDatastore

    void onApplicationEvent(ApplicationEvent event) {
        if (event instanceof ConnectionOpenedEvent) {
            ConnectionOpenedEvent openedEvent = (ConnectionOpenedEvent) event
            println "连接已打开：${openedEvent.uri}"
        } else if (event instanceof ConnectionClosedEvent) {
            ConnectionClosedEvent closedEvent = (ConnectionClosedEvent) event
            println "连接已关闭：${closedEvent.uri}"
        }
    }
}

beans = {
    mongoDBConnectionListener(MongoDBConnectionListener) {
        mongoDatastore = ref('mongoDatastore')
    }
}