package com.gkhy.huataiFourierSpecialGasMonitor.websocket;
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import com.alibaba.fastjson.JSON;
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import com.alibaba.fastjson.JSONObject;
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import io.micrometer.core.instrument.util.StringUtils;
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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.PathParam;
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import javax.websocket.server.ServerEndpoint;
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import java.io.IOException;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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@Slf4j
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@ServerEndpoint("/ws/gas/exc/{userId}")
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@Component
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public class GasConcentrationExcWebsocketServer {
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/**
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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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*/
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private static int onlineCount = 0;
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/**
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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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* 根据userId来获取对应的 WebSocket
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*/
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private static ConcurrentHashMap<String, GasConcentrationExcWebsocketServer> webSocketMap = new ConcurrentHashMap<>();
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/**
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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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*/
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private Session session;
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/**
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* 接收 sid
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*/
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private String userId = "";
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/**
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* 连接建立成功调用的方法
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*
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* @param session
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* @param userId
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*/
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@OnOpen
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public void onOpen(Session session, @PathParam("userId") String userId) {
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this.session = session;
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this.userId = userId;
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webSocketMap.put(userId, this);
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//log.info("webSocketMap -> " + JSON.toJSONString(webSocketMap));
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addOnlineCount(); // 在线数 +1
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//log.info("【气体浓度异常】有新窗口开始监听:" + userId + ",当前在线人数为" + getOnlineCount());
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try {
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sendMessage(JSON.toJSONString("【气体浓度异常】连接成功"));
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} catch (IOException e) {
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e.printStackTrace();
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throw new RuntimeException("【气体浓度异常】websocket IO异常!!!!");
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}
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}
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/**
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* 关闭连接
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*/
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@OnClose
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public void onClose() {
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if (webSocketMap.get(this.userId) != null) {
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webSocketMap.remove(this.userId);
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subOnlineCount(); // 人数 -1
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//log.info("【气体浓度异常】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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/**
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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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* @param session
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*/
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@OnMessage
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public void onMessage(String message, Session session) {
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//log.info("收到来自窗口" + userId + "的信息:" + message);
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if (StringUtils.isNotBlank(message)) {
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try {
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// 解析发送的报文
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JSONObject jsonObject = JSON.parseObject(message);
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// 追加发送人(防窜改)
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jsonObject.put("fromUserId", this.userId);
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String toUserId = jsonObject.getString("toUserId");
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// 传送给对应 toUserId 用户的 WebSocket
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if (StringUtils.isNotBlank(toUserId) && webSocketMap.containsKey(toUserId)) {
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webSocketMap.get(toUserId).sendMessage(jsonObject.toJSONString());
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} else {
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log.info("请求的userId:" + toUserId + "不在该服务器上"); // 否则不在这个服务器上,发送到 MySQL 或者 Redis
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}
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} catch (Exception 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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* @param session
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* @param error
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*/
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@OnError
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public void onError(Session session, Throwable error) {
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//log.error("用户错误:" + this.userId + ",原因:" + error.getMessage());
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//error.printStackTrace();
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}
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/**
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* 实现服务器主动推送
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*
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* @param message
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* @throws IOException
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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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}
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/**
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* 群发自定义消息
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*
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* @param message
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* @param userId
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* @throws IOException
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*/
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public static void sendInfo(String message, @PathParam("userId") String userId) throws IOException {
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// 遍历集合,可设置为推送给指定sid,为 null 时发送给所有人
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Iterator entrys = webSocketMap.entrySet().iterator();
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while (entrys.hasNext()) {
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Map.Entry entry = (Map.Entry) entrys.next();
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if (userId == null) {
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webSocketMap.get(entry.getKey()).sendMessage(message);
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//log.info("【气体浓度异常】发送消息到:" + entry.getKey() + ",消息:" + message);
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} else if (entry.getKey().equals(userId)) {
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webSocketMap.get(entry.getKey()).sendMessage(message);
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//log.info("【气体浓度异常】发送消息到:" + entry.getKey() + ",消息:" + message);
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}
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}
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}
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private static synchronized int getOnlineCount() {
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return onlineCount;
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}
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private static synchronized void addOnlineCount() {
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GasConcentrationExcWebsocketServer.onlineCount++;
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}
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private static synchronized void subOnlineCount() {
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GasConcentrationExcWebsocketServer.onlineCount--;
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}
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}
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