java - 当应用程序集群时在两个 JVM 之间共享数据

Question

我正在开发一个 spring-boot 应用程序，它可以集群到许多实例中。

session 数据由 Spring Session + Hazelcast 存储和处理，但问题出在像这样的情况下。我有一个包含一组对象的类:

@ServerEndpoint(value="/chat/{username}")
public class ChatEndpoint {

    private Session session;
    private static Set<ChatEndpoint> chatEndpoints 
      = new CopyOnWriteArraySet<>();
    private static HashMap<String, String> users = new HashMap<>();

    @OnOpen
    public void onOpen(
      ....
    }

    @OnMessage
    public void onMessage(Session session, Message message) 
      throws IOException {
      ....
    }
   ....
}

在这种情况下，数据在 JVM 的每个实例上本地可用。如何使这些数据在所有 JVM 之间共享？

Answer 1

由于您的技术堆栈中已提供 Hazelcast，因此请使用 caching facility of Hazelcast :

Hazelcast is the leading in-memory data grid solution. Its java caching solution enables organizations to predictably scale mission-critical enterprise applications by providing in-memory access to frequently used data. Hazelcast stores frequently accessed data in-memory and across an elastically scalable data grid. This enables any network of machines to dynamically cluster and pool both memory and processors to accelerate application performance.

您可以将这组数据放入使用 Hazelcast 创建的缓存中，并访问集群中其他节点上的数据。