WebSocket和端点

Question

我的IDE：NetBeans，GlassFish。 我试图了解GlassFish如何执行和运行端点！ 我理解Glassfish作为Web服务器为每个连接创建新的Endpoint实例，代码中的Set：peers作为每个端点实例的一个全局变量。 我的问题是：如何添加另一个全局变量，以便每个端点实例都可以访问它？

 enter code here

import java.io.IOException;

import java.util.Collections; 
import java.util.HashSet; 
import java.util.Set; 
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;



@ServerEndpoint("/echo") 
public class EchoServer {
    /**
     * @OnOpen allows us to intercept the creation of a new session.
     * The session class allows us to send data to the user.
     * In the method onOpen, we'll let the user know that the handshake was 
     * successful.
     */
     private static final Set<Session > peers = Collections.synchronizedSet(new HashSet<Session >());

    @OnOpen
    public void onOpen(Session session){


        System.out.println(session.getId() + " has opened a connection"); 
        try {
            peers.add(session);

            session.getBasicRemote().sendText("Connection Established");
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }


    @OnMessage
    public void onMessage(String message, Session session) throws IOException{

        System.out.println("Message from " + session.getId() + ": " + message);

        for (Session  peer : peers) {
             peer.aplayer.getBasicRemote().sendText(" Message from " + session.getId()+" : "+message); 
        }
    }`enter code here`


    @OnClose
    public void onClose(Session session){
        System.out.println("Session " +session.getId()+" has ended");
        peers.remove(session);
    }
}