java - mongodb连接线程安全

Question

我正在根据一些教程使用以下代码连接到 mongo 数据库。

我对设计有一些疑问:

1. 可以同时从多个线程调用 MongoConnection.getDB() 函数吗？
2. 如果不是，我应该同步吗？
3. 如果设计有问题，它会产生什么样的不良影响？

我是 mongodb 的新手，所以我的问题听起来有点幼稚。

public class MongoConnection {

    private static MongoClient mongoClient = null;

    private static String IP = "mongodb://user:pwd@localhost:27017/?authSource=demodb&authMechanism=SCRAM-SHA-1";
    private static String DATABASE = "demodb";

    static {
        mongoClient = new MongoClient(new MongoClientURI(IP));
    }

    private MongoConnection() {

    }

    public static DB getDB() {
        return mongoClient.getDB(DATABASE);
    }
}

Answer 1

来自docs :

The MongoClient instance represents a pool of connections to the database; you will only need one instance of class MongoClient even with multiple threads.

并且来自 previous versions' quick start guides :

The MongoClient class is designed to be thread safe and shared among threads. Typically you create only 1 instance for a given database cluster and use it across your application.`

所以，MongoClient.getDb(..) 在线程之间应该没有任何问题