WebSocket 使用方式，如何扩展比如统计消息数量

直接贴代码

package com.cf.mqtt.controller.socket;

import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import lombok.val;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;

@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}")  
// 前端接口路径 ws://localhost:8080/webSocket/userId; 
public class WebSocket {

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    /**
     * 用户ID
     */
    private String userId;

    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    //虽然@Component默认是单例模式的，但springboot还是会为每个websocket连接初始化一个bean，所以可以用一个静态set保存起来。
    //  注：底下WebSocket是当前类名
    private static CopyOnWriteArraySet<WebSocket> webSockets =new CopyOnWriteArraySet<>();
    // 用来存在线连接用户信息
    private static ConcurrentHashMap<String,Session> sessionPool = new ConcurrentHashMap<String,Session>();

    /**
     * 链接成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam(value="userId")String userId) {
        boolean flag  = true;
        try {
			//同一用户尝试重新连接，保证
            for (WebSocket webSocket:webSockets) {
                if(webSocket.userId.equals(userId)) {
                    log.info("【websocket消息】当前连接+" + userId +  "+已存在，总数为:"+webSockets.size());
                    this.session = sessionPool.get(userId);
                    this.userId = userId;
                    flag = false;
                    break;
                }
            }
            if(flag){
                this.session = session;
                this.userId = userId;
                webSockets.add(this);
                sessionPool.put(userId, session);
            }
            log.info("【websocket消息】有新的连接，总数为:"+webSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 链接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        try {
            webSockets.remove(this);
            sessionPool.remove(this.userId);
            log.info("【websocket消息】连接断开，总数为:"+webSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 用于服务端主动断开连接
     * @param userId
     */
    public void close(String userId) throws IOException {

        for (WebSocket webSocket:webSockets) {
           if(webSocket.userId.equals(userId)) {

               session = sessionPool.get(userId);
//               session.close();
               CloseReason.CloseCode closeCode = CloseReason.CloseCodes.getCloseCode(1000);
               CloseReason cr = new CloseReason(closeCode,"服务器主动剔除行为");
               session.close(cr);
               webSockets.remove(webSocket);
               sessionPool.remove(userId);
               log.info("【websocket消息】服务主动断开了UserId:"+userId);
               log.info("【websocket消息】连接断开，总数为:"+webSockets.size());
               break;
            }
        }
    }
    /**
     * 收到客户端消息后调用的方法
     *
     * @param message
     */
    private int cc = 0;
    @OnMessage
    public void onMessage(String message) {
        for (WebSocket webSocket:webSockets) {
            webSocket.cc ++;
        }

        log.info("【websocket消息】收到客户端消息:"+cc);
        log.info("【websocket消息】收到客户端消息:"+message);
    }

    /** 发送错误时的处理
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {

        log.error("用户错误,原因:"+error.getMessage());
        error.printStackTrace();
    }


    // 此为广播消息
    public void sendAllMessage(String message) {
        log.info("【websocket消息】广播消息:"+message);
        for(WebSocket webSocket : webSockets) {
            try {
                if(webSocket.session.isOpen()) {
                    webSocket.session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息
    public void sendOneMessage(String userId, String message) {
        Session session = sessionPool.get(userId);
        if (session != null&&session.isOpen()) {
            try {
                log.info("【websocket消息】 单点消息"+ userId +":"+message);
                session.getAsyncRemote().sendText(message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息(多人)
    public void sendMoreMessage(String[] userIds, String message) {
        for(String userId:userIds) {
            Session session = sessionPool.get(userId);
            if (session != null&&session.isOpen()) {
                try {
                    log.info("【websocket消息】 单点消息"+ userId +":"+message);
                    session.getAsyncRemote().sendText(message);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

    }

}