package com.cloud.attendance.service.impl;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.stereotype.Component;
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import javax.websocket.*;
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import javax.websocket.server.ServerEndpoint;
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import java.io.IOException;
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import java.util.concurrent.CopyOnWriteArraySet;
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@Slf4j
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//@ServerEndpoint(value = "/websocket")
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//@Component
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public class MyWebSocket {
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//静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
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private static int onlineCount = 0;
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//concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
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private static CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>();
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//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
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private Session session;
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/**
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* 连接建立成功调用的方法*/
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@OnOpen
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public void onOpen(Session session){
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this.session = session;
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webSocketSet.add(this); //加入set中
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addOnlineCount(); //在线数加1
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log.info("有新连接加入！当前在线人数为" + getOnlineCount());
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try {
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sendMessage("{\"msg\":\"等待消息吧\"}");
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} catch (IOException e) {
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System.out.println("IO异常;"+e);
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}
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}
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/**
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* 连接关闭调用的方法
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*/
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@OnClose
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public void onClose() {
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webSocketSet.remove(this); //从set中删除
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subOnlineCount(); //在线数减1
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log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
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}
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/**
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* 收到客户端消息后调用的方法
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*
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* @param message 客户端发送过来的消息*/
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@OnMessage
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public void onMessage(String message, Session session) {
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log.info("来自客户端的消息:" + message);
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//群发消息
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for (MyWebSocket item : webSocketSet) {
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try {
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item.sendMessage(message);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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/**
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* 发生错误时调用
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* */
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@OnError
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public void onError(Session session, Throwable error) {
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System.out.println("发生错误");
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error.printStackTrace();
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}
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public void sendMessage(String message) throws IOException {
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this.session.getBasicRemote().sendText(message);
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//this.session.getAsyncRemote().sendText(message);
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}
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/**
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* 群发自定义消息
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* */
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public static void sendInfo(String message) throws IOException {
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for (MyWebSocket item : webSocketSet) {
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try {
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item.sendMessage(message);
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} catch (IOException e) {
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continue;
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}
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}
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}
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public static synchronized int getOnlineCount() {
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return onlineCount;
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}
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public static synchronized void addOnlineCount() {
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MyWebSocket.onlineCount++;
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}
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public static synchronized void subOnlineCount() {
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MyWebSocket.onlineCount--;
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}
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}
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