package com.terra.system.service.all;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.stereotype.Component;
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import javax.annotation.PostConstruct;
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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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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* WebSocket服务类
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* @author WWW
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*/
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@ServerEndpoint(value = "/ws/select")
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@Component
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public class WebSocketService {
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@PostConstruct
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public void init() {
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System.out.println("websocket 加载");
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}
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private final static Logger log = LoggerFactory.getLogger(WebSocketService.class);
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private static final AtomicInteger ONLINE_COUNT = new AtomicInteger(0);
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/**
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* 用来存放每个客户端对应的Session对象（线程安全Set）
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*/
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private final static CopyOnWriteArraySet<Session> SESSION_SET = new CopyOnWriteArraySet<Session>();
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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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@OnOpen
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public void onOpen(Session session) {
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SESSION_SET.add(session);
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int cnt = ONLINE_COUNT.incrementAndGet();
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log.info("有连接加入，当前连接数为：{}", cnt);
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sendMessage(session, "连接成功");
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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(Session session) {
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SESSION_SET.remove(session);
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int cnt = ONLINE_COUNT.decrementAndGet();
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log.info("有连接关闭，当前连接数为：{}", cnt);
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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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*/
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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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sendMessage(session, "收到消息，消息内容：" + message);
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}
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/**
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* 出现错误
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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("发生错误：{}，Session ID： {}", error.getMessage(), session.getId());
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}
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/**
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* 发送消息，实践表明，每次浏览器刷新，session会发生变化。
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*
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* @param session
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* @param message
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*/
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public static void sendMessage(Session session, String message) {
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try {
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session.getBasicRemote().sendText(String.format("%s", message));
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} catch (Exception ex) {
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log.error("发送消息出错：{}", ex.getMessage());
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}
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}
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/**
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* 群发消息
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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 static void broadCastInfo(String message) throws IOException {
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for (Session session : SESSION_SET) {
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if (session.isOpen()) {
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sendMessage(session, message);
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}
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}
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}
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/**
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* 指定Session发送消息
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*
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* @param sessionId
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* @param message
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* @throws IOException
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*/
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public static void sendMessage(String message, String sessionId) throws IOException {
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Session session = null;
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for (Session s : SESSION_SET) {
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if (s.getId().equals(sessionId)) {
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session = s;
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break;
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}
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}
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if (session != null) {
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sendMessage(session, message);
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} else {
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log.info("没有找到你指定ID的会话：{}", sessionId);
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}
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}
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}
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