Java 类javax.websocket.OnOpen 实例源码

@OnOpen
public void onOpen(Session session, @PathParam("uuid") String uuid) {
    UUID key = UUID.fromString(uuid);
    peers.put(key, session);
    JsonArrayBuilder builder = Json.createArrayBuilder();
    for (StatusEventType statusEventType : StatusEventType.values()) {
        JsonObjectBuilder object = Json.createObjectBuilder();
        builder.add(object.add(statusEventType.name(), statusEventType.getMessage()).build());
    }

    RemoteEndpoint.Async asyncRemote = session.getAsyncRemote();
    asyncRemote.sendText(builder.build().toString());
    // Send pending messages
    List<String> messages = messageBuffer.remove(key);
    if (messages != null) {
        messages.forEach(asyncRemote::sendText);
    }
}

@OnOpen
public void onOpen(Session session) throws NamingException {
    logger.info("Open session:" + session.getId());
    ManagedExecutorService mes = doLookup("java:comp/DefaultManagedExecutorService");
    final Session s = session;
    mes.execute(new Runnable() {
        @Override
        public void run() {
            try {
                for (int i = 0; i < 3; i++) {
                    sleep(10000);
                    s.getBasicRemote().sendText("Message from server");
                }
            } catch (InterruptedException | IOException e) {
                logger.log(SEVERE, "connection error", e);
            }
        }
    });
}

/**
    * Registeres the Learner for processing.
    */
   @OnOpen
   public void registerUser(Session websocket) throws JSONException, IOException {
Long toolContentID = Long
    .valueOf(websocket.getRequestParameterMap().get(AttributeNames.PARAM_TOOL_CONTENT_ID).get(0));
Set<Session> toolContentWebsockets = websockets.get(toolContentID);
if (toolContentWebsockets == null) {
    toolContentWebsockets = ConcurrentHashMap.newKeySet();
    websockets.put(toolContentID, toolContentWebsockets);
}
toolContentWebsockets.add(websocket);

if (log.isDebugEnabled()) {
    log.debug("User " + websocket.getUserPrincipal().getName() + " entered Dokumaran with toolContentId: "
        + toolContentID);
}
   }

/**
    * Registeres the Learner for processing.
    */
   @OnOpen
   public void registerUser(Session websocket) throws JSONException, IOException {
Long toolSessionId = Long
    .valueOf(websocket.getRequestParameterMap().get(AttributeNames.PARAM_TOOL_SESSION_ID).get(0));
Set<Session> sessionWebsockets = websockets.get(toolSessionId);
if (sessionWebsockets == null) {
    sessionWebsockets = ConcurrentHashMap.newKeySet();
    websockets.put(toolSessionId, sessionWebsockets);
}
sessionWebsockets.add(websocket);

if (log.isDebugEnabled()) {
    log.debug("User " + websocket.getUserPrincipal().getName()
        + " entered Leader Selection with toolSessionId: " + toolSessionId);
}
   }

/**
    * Registeres the Learner for processing by SendWorker.
    */
   @OnOpen
   public void registerUser(Session session) throws IOException {
Long lessonId = Long.valueOf(session.getRequestParameterMap().get(AttributeNames.PARAM_LESSON_ID).get(0));
Set<Websocket> sessionWebsockets = PresenceWebsocketServer.websockets.get(lessonId);
if (sessionWebsockets == null) {
    sessionWebsockets = ConcurrentHashMap.newKeySet();
    PresenceWebsocketServer.websockets.put(lessonId, sessionWebsockets);
}
Websocket websocket = new Websocket(session);
sessionWebsockets.add(websocket);

Roster roster = PresenceWebsocketServer.rosters.get(lessonId);
if (roster == null) {
    boolean imEnabled = Boolean.valueOf(session.getRequestParameterMap().get("imEnabled").get(0));
    // build a new roster object
    roster = new Roster(lessonId, imEnabled);
    PresenceWebsocketServer.rosters.put(lessonId, roster);
}

new Thread(() -> {
    try {
    // websocket communication bypasses standard HTTP filters, so Hibernate session needs to be initialised manually
    HibernateSessionManager.openSession();
    SendWorker.send(lessonId, websocket.nickName);
    } finally {
    HibernateSessionManager.closeSession();
    }
}).start();

if (PresenceWebsocketServer.log.isDebugEnabled()) {
    PresenceWebsocketServer.log
        .debug("User " + websocket.nickName + " entered Presence Chat with lesson ID: " + lessonId);
}
   }

/**
    * Registeres the Learner for processing by SendWorker.
    */
   @OnOpen
   public void registerUser(Session session) throws IOException {
Long toolSessionId = Long
    .valueOf(session.getRequestParameterMap().get(AttributeNames.PARAM_TOOL_SESSION_ID).get(0));
Set<Websocket> sessionWebsockets = LearningWebsocketServer.websockets.get(toolSessionId);
if (sessionWebsockets == null) {
    sessionWebsockets = ConcurrentHashMap.newKeySet();
    LearningWebsocketServer.websockets.put(toolSessionId, sessionWebsockets);
}
final Set<Websocket> finalSessionWebsockets = sessionWebsockets;

String userName = session.getUserPrincipal().getName();
new Thread(() -> {
    try {
    // websocket communication bypasses standard HTTP filters, so Hibernate session needs to be initialised manually
    HibernateSessionManager.openSession();
    ChatUser chatUser = LearningWebsocketServer.getChatService().getUserByLoginNameAndSessionId(userName,
        toolSessionId);
    Websocket websocket = new Websocket(session, chatUser.getNickname(), chatUser.getUserId(), getPortraitId(chatUser.getUserId()));
    finalSessionWebsockets.add(websocket);

    // update the chat window immediatelly
    SendWorker.send(toolSessionId);

    if (LearningWebsocketServer.log.isDebugEnabled()) {
        LearningWebsocketServer.log
            .debug("User " + userName + " entered Chat with toolSessionId: " + toolSessionId);
    }
    } finally {
    HibernateSessionManager.closeSession();
    }
}).start();
   }

/**
    * Registeres the Learner for processing by SendWorker.
    */
   @OnOpen
   public void registerUser(Session websocket) throws JSONException, IOException {
Long toolSessionId = Long
    .valueOf(websocket.getRequestParameterMap().get(AttributeNames.PARAM_TOOL_SESSION_ID).get(0));
Set<Session> sessionWebsockets = LearningWebsocketServer.websockets.get(toolSessionId);
if (sessionWebsockets == null) {
    sessionWebsockets = ConcurrentHashMap.newKeySet();
    LearningWebsocketServer.websockets.put(toolSessionId, sessionWebsockets);

    Map<Long, Map<Long, Boolean>> sessionCache = new TreeMap<>();
    LearningWebsocketServer.cache.put(toolSessionId, sessionCache);
}
sessionWebsockets.add(websocket);

if (LearningWebsocketServer.log.isDebugEnabled()) {
    LearningWebsocketServer.log.debug("User " + websocket.getUserPrincipal().getName()
        + " entered Scratchie with toolSessionId: " + toolSessionId);
}
   }

/**
    * Registeres the Learner for processing by SendWorker.
    */
   @OnOpen
   public void registerUser(Session websocket) throws JSONException, IOException {
Long toolSessionId = Long
    .valueOf(websocket.getRequestParameterMap().get(AttributeNames.PARAM_TOOL_SESSION_ID).get(0));
Set<Session> sessionWebsockets = LearningWebsocketServer.websockets.get(toolSessionId);
if (sessionWebsockets == null) {
    sessionWebsockets = ConcurrentHashMap.newKeySet();
    LearningWebsocketServer.websockets.put(toolSessionId, sessionWebsockets);
}
sessionWebsockets.add(websocket);

if (LearningWebsocketServer.log.isDebugEnabled()) {
    LearningWebsocketServer.log.debug("User " + websocket.getUserPrincipal().getName()
        + " entered Scribe with toolSessionId: " + toolSessionId);
}

new Thread(() -> {
    try {
    HibernateSessionManager.openSession();
    SendWorker.send(toolSessionId, websocket);
    } catch (Exception e) {
    log.error("Error while sending messages", e);
    } finally {
    HibernateSessionManager.closeSession();
    }
}).start();
   }

/**
 * 连接建立成功调用的方法-与前端JS代码对应
 * 
 * @param session 可选的参数。session为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
 */
@OnOpen
public void onOpen(Session session, EndpointConfig config) {
    // 单个会话对象保存
    this.session = session;
    webSocketSet.add(this); // 加入set中
    this.httpSession = (HttpSession) config.getUserProperties().get(HttpSession.class.getName());
    String uId = (String) httpSession.getAttribute("userid"); // 获取当前用户
    String sessionId = httpSession.getId();
    this.userid = uId + "|" + sessionId;
    if (!OnlineUserlist.contains(this.userid)) {
        OnlineUserlist.add(userid); // 将用户名加入在线列表
    }
    routetabMap.put(userid, session); // 将用户名和session绑定到路由表
    System.out.println(userid + " -> 已上线");
    String message = getMessage(userid + " -> 已上线", "notice", OnlineUserlist);
    broadcast(message); // 广播
}

@OnOpen
public void userConnectedCallback(@PathParam("user") String user, Session s) {
    if (USERS.contains(user)) {
        try {
            dupUserDetected = true;
            s.getBasicRemote().sendText("Username " + user + " has been taken. Retry with a different name");
            s.close();
            return;
        } catch (IOException ex) {
            Logger.getLogger(ChatServer.class.getName()).log(Level.SEVERE, null, ex);
        }

    }
    this.s = s;
    s.getUserProperties().put("user", user);
    this.user = user;
    USERS.add(user);

    welcomeNewJoinee();
    announceNewJoinee();
}

@OnOpen
public void userConnectedCallback(@PathParam("user") String user, Session s) {

    if (USERS.contains(user)) {
        try {
            dupUserDetected = true;
            s.getBasicRemote().sendObject(new DuplicateUserNotification(user));
            s.close();
            return;
        } catch (Exception ex) {
            Logger.getLogger(ChatServer.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

    this.s = s;
    SESSIONS.add(s);
    s.getUserProperties().put("user", user);
    this.user = user;
    USERS.add(user);

    welcomeNewJoinee();
    announceNewJoinee();
}

/**连接建立成功调用的方法*/
@OnOpen
public void onOpen(Session session,EndpointConfig config){
    HttpSession httpSession = (HttpSession) config.getUserProperties().get(HttpSession.class.getName());
    if(StorageUtil.init(httpSession).getLoginMemberId()!=ReturnUtil.NOT_LOGIN_CODE){
        long userId = StorageUtil.init(httpSession).getLoginMemberId();
        mapUS.put(userId,session);
        mapSU.put(session,userId);
        //上线通知由客户端自主发起
        onlineCount++;           //在线数加1
        System.out.println("用户"+userId+"进入WebSocket！当前在线人数为" + onlineCount);
        getUserKey(userId);
    }else{
        try {
            session.close();
            System.out.println("未获取到用户信息，关闭WebSocket！");
        } catch (IOException e) {
            System.out.println("关闭WebSocket失败！");
        }
    }
}

/**
 * Open a socket connection to a client from the web server
 *
 * @param session The session that just opened
 */
@OnOpen
public void openSocket(@PathParam(RT_COMPUTE_ENDPOINT_PARAM) ConnectionType type,
                       Session session) {
    session.setMaxIdleTimeout(0);
    String sessionId = session.getId();
    if (type == ConnectionType.SUBSCRIBER) {
        LOG.info("Got a new subscriber connection request with ID {}. Saving session", sessionId);
        // cleanup sessions
        Set<Session> closedSessions = Sets.newHashSet();
        for (Session existingSession : sessions) {
            if (!existingSession.isOpen()) {
                closedSessions.add(existingSession);
            }
        }
        sessions.removeAll(closedSessions);

        sessions.add(session);
        LOG.info("Active sessions {}. Collecting {} sessions",
                 sessions.size(), closedSessions.size());

    } else {
        LOG.info("Got a new publisher connection request with ID {}", sessionId);
    }
}

@OnOpen
public void onOpen(Session session,@PathParam("username") String username) {
    try{
        client.add(session);
        user.put(URLEncoder.encode(username, "UTF-8"),URLEncoder.encode(username, "UTF-8"));
        JSONObject jo = new JSONObject();
        JSONArray ja = new JSONArray();
        //获得在线用户列表
        Set<String> key = user.keySet();
        for (String u : key) {
            ja.add(u);
        }
        jo.put("onlineUser", ja);
        session.getBasicRemote().sendText(jo.toString());
    }catch(Exception e){
        //do nothing
    }
}

@OnOpen
public void onOpen(Session session, @PathParam("uuid") String uuid) {
    UUID key = UUID.fromString(uuid);
    peers.put(key, session);
    JsonArrayBuilder builder = Json.createArrayBuilder();
    for (StatusMessage statusMessage : StatusMessage.values()) {
        JsonObjectBuilder object = Json.createObjectBuilder();
        builder.add(object.add(statusMessage.name(), statusMessage.getMessage()).build());
    }

    RemoteEndpoint.Async asyncRemote = session.getAsyncRemote();
    asyncRemote.sendText(builder.build().toString());
    // Send pending messages
    List<String> messages = messageBuffer.remove(key);
    if (messages != null) {
        messages.forEach(asyncRemote::sendText);
    }
}

@OnOpen
public void onOpen(Session userSession) throws InterruptedException {
    String clientIp = ((TyrusSession)userSession).getRemoteAddr();
    InetAddress identity;
    try {
        identity = InetAddress.getByName(clientIp);
    } catch (UnknownHostException e) {
        try {
            userSession.close();
        } catch (IOException er) {
            return;
        }
        return;
    }

    WebsocketPeer.WebsocketSession session = localOpenSessions.putOpenSession(identity, userSession);
    Send<Bytestring> receiver = listener.newSession(session);
    receiveMap.put(userSession, receiver);
}

@OnOpen
public void onOpen(final Session session) {
    LOGGER.debug("Socket opened for session {}", session.getId());

    // Endpoint setup
    this.session = session;
    reference = createReference();

    // Session setup
    final String watcherId = getRequestParam("watcherId");
    session.getUserProperties().put(REFERENCE_USER_PROP, reference);
    session.getUserProperties().put(WATCHER_ID_USER_PROP, watcherId);

    // FIXME Setting timeout with Jetty implementation doesn't work
    // session.setMaxIdleTimeout(TimeUnit.MILLISECONDS.toSeconds(20));

    // Refresh watcher list to all sessions
    final List<Session> sessions = findSessionsWithSameReference();
    final Set<String> allWatcherIds = getAllWatcherIds(sessions);
    sessions.forEach(someSession -> sendWatchersToSession(someSession, allWatcherIds));
}

/**
 * WebSocket session opened event handler.
 * 
 * @param session - Session that has been opened
 */
@OnOpen
public void open(Session session) {
    this.session = session;

    System.out.println("Session opened with ID: " + session.getId());

    BallotBox ballotBox = BallotBox.getInstance();
    ballotBox.addObserver(this);
    session.getUserProperties().put("ballotbox", ballotBox);

    try {
        notify(ballotBox);
    } catch (IOException | EncodeException e) {
        e.printStackTrace();
    }
}

/**
 * Connection opened by a client.
 *
 * @param session the WebSocket session for the connection.
 * @param conf the Endpoint configuration.
 */
@OnOpen
public void onOpen(Session session, EndpointConfig conf) {
    log.debug("WebSocket new session: {}", session.getId());
    this.isOpen = true;

    //
    // Initialization and Topology Service registration
    //
    this.socketSession = session;
    ITopologyService topologyService = WebSocketManager.topologyService;
    topologyService.addListener(this, true);

    // Start the thread
    start();
}

@OnOpen
public void onOpen(Session websocketSession, EndpointConfig config) {
    LOGGER.debug("WebSocket open");
    try {
        this.websocketSession = websocketSession;
        ServletContext servletContext = servletContexts.get(websocketSession.getContainer());
        if (servletContext == null) {
            servletContext = defaultServletContext;
        }
        BimServer bimServer = (BimServer) servletContext.getAttribute("bimserver");
        streamer = new Streamer(this, bimServer);
        streamer.onOpen();
    } catch (Throwable t) {
        LOGGER.error("", t);
    }
}

@OnOpen
public void processOnOpen(Session session) {
    System.out.println("open connection id: " + session.getId());

    File dir = new File("uploads");
    if (!dir.exists()) {
        try {
            Files.createDirectory(dir.toPath());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    this.session = session;
    this.storage = dir.toPath();

}

@OnOpen
public void onOpen(Session session, EndpointConfig config) {
    try {
        this.request = (HttpServletRequest) config.getUserProperties().get("httpRequest");
        this.response = (HttpServletResponse) config.getUserProperties().get("httpResponse");
        this.session = (HttpSession) config.getUserProperties().get("httpSession");

        Request _request = (Request) GenericReflection.NoThrow.getValue(Core.requestField, this.request);
        _request.setContext((Context) config.getUserProperties().get("context"));

        session.setMaxBinaryMessageBufferSize(JRenderConfig.Server.Request.Websocket.maxBinaryMessageSize);
        session.setMaxTextMessageBufferSize(JRenderConfig.Server.Request.Websocket.maxTextMessageSize);
        session.setMaxIdleTimeout(JRenderConfig.Server.Request.Websocket.maxIdleTimeout);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

@OnOpen
public void open(Session session)  {
    System.out.printf("%s.open() called session=%s\n", getClass().getSimpleName(), session );

    // This is a work around
    System.out.printf("  sampleSingleton = %s *BEFORE*\n", sampleSingleton );
    if ( sampleSingleton == null) {
        // Look up the object
        Context initialContext = null;
        try {
            initialContext = new InitialContext();
            Object obj = initialContext.lookup("java:global/mywebapp/SampleSingleton");
            System.out.printf("   obj=%s\n", obj);
            sampleSingleton = (SampleSingleton)obj;
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }
    System.out.printf("  sampleSingleton = %s *AFTER*\n", sampleSingleton );
}

@OnOpen
public void open(Session session)  {
    System.out.printf("%s.open() called session=%s\n", getClass().getSimpleName(), session );

    // This is a work around
    System.out.printf("  sampleSingleton = %s *BEFORE*\n", sampleSingleton );
    if ( sampleSingleton == null) {
        // Look up the object
        Context initialContext = null;
        try {
            initialContext = new InitialContext();
            Object obj = initialContext.lookup("java:global/mywebapp/SampleSingleton");
            System.out.printf("   obj=%s\n", obj);
            sampleSingleton = (SampleSingleton)obj;
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }
    System.out.printf("  sampleSingleton = %s *AFTER*\n", sampleSingleton );
}

@OnOpen
public void openRemoteConnection( final Session session) {
    System.out.printf("%s.openRemoteConnection( session = [%s], ",
        getClass().getSimpleName(), session);

    executorService.scheduleAtFixedRate(new Runnable() {
        @Override
        public void run() {
            try {
                System.out.printf("%s.run( session = [%s], %s\n",
                    getClass().getSimpleName(), session, price);
                session.getBasicRemote().sendText(
                    "PRICE = " + price);
                synchronized (lock) {
                    if (Math.random() < 0.5) {
                        price = price.subtract(unitPrice);
                    } else {
                        price = price.add(unitPrice);
                    }
                }
            } catch (IOException e) {
                e.printStackTrace(System.err);
            }
        }
    }, 500, 500, MILLISECONDS);
}

@OnOpen
public void open(Session session)  {
    System.out.printf("%s.open() called session=%s\n", getClass().getSimpleName(), session );

    // This is a work around
    System.out.printf("  sampleSingleton = %s *BEFORE*\n", sampleSingleton );
    if ( sampleSingleton == null) {
        // Look up the object
        Context initialContext = null;
        try {
            initialContext = new InitialContext();
            Object obj = initialContext.lookup("java:global/mywebapp/SampleSingleton");
            System.out.printf("   obj=%s\n", obj);
            sampleSingleton = (SampleSingleton)obj;
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }
    System.out.printf("  sampleSingleton = %s *AFTER*\n", sampleSingleton );
}

/**
 * Callback when receiving opened connection from client side
 *
 * @param session     the client {@link Session}
 * @param config      the associated {@link EndpointConfig} to the new connection
 * @param executionId the execution identifier from the {@link ServerEndpoint} path
 */
@OnOpen
public void openConnection(Session session, EndpointConfig config, @PathParam("execution-id") long executionId) {
    if (LOG.isDebugEnabled()) {
        LOG.debug("Session " + session.getId() + " opened connection to execution " + executionId);
    }
    mainLock.lock();
    try {
        sessions.put(session.getId(), session);
        Set<String> registeredSessions = executions.get(executionId);
        if (registeredSessions == null) {
            registeredSessions = new HashSet<>();
        }
        registeredSessions.add(session.getId());
        executions.put(executionId, registeredSessions);
    } finally {
        mainLock.unlock();
    }
}

@OnOpen
public void onOpen(Session session) {
    System.out.printf("WebSocket session opened, id: %s%n", session.getId());

    ClientSession clientSession = new ClientSession(new MAVLinkWebSocket(session), mtMessageQueue);
    clientSession.onOpen();
    sessions.put(session.getId(), clientSession);
}

@OnOpen
public void open(Session session) {
    try {
        session.getBasicRemote().sendText(
                "{\"topic\": \"title\", \"payload\": {\"title\":\"Application Metrics for Java\", \"docs\": \"http://github.com/RuntimeTools/javametrics\"}}");
    } catch (IOException e) {
        e.printStackTrace();
    }
    openSessions.add(session);
    DataHandler.registerEmitter(this);
}

@OnOpen
public void onOpen(@SuppressWarnings("unused") Session session,
        EndpointConfig config) {
    if (config == null) {
        throw new RuntimeException();
    }
}

@OnOpen
public void onOpen(final Session session, EndpointConfig ec) {
    currentSession = session;
    agent = getRandomSupportAgent(); 

    String greeting = getGreeting(agent); 
    currentSession.getAsyncRemote().sendText(greeting);
}

@OnOpen
public void onOpen(final Session session, EndpointConfig ec) {
    currentSession = session;
    agent = getRandomSupportAgent(); 

    String greeting = getGreeting(agent); 
    currentSession.getAsyncRemote().sendText(greeting);
}

@OnOpen
   public void registerUser(Session websocket) throws IOException {
Integer organisationId = Integer
    .valueOf(websocket.getRequestParameterMap().get(AttributeNames.PARAM_ORGANISATION_ID).get(0));
Integer userId = getUser(websocket).getUserId();
if (!KumaliveWebsocketServer.getSecurityService().hasOrgRole(organisationId, userId,
    new String[] { Role.GROUP_MANAGER, Role.MONITOR, Role.LEARNER }, "register on kumalive", false)) {
    // prevent unauthorised user from accessing Kumalive
    String warning = "User " + userId + " is not a monitor nor a learner of organisation " + organisationId;
    logger.warn(warning);
    websocket.close(new CloseReason(CloseCodes.CANNOT_ACCEPT, warning));
}
   }

/**
    * Registeres the Learner for processing by SendWorker.
    */
   @OnOpen
   public void registerUser(Session websocket) throws IOException {
Long lessonId = Long.valueOf(websocket.getRequestParameterMap().get(AttributeNames.PARAM_LESSON_ID).get(0));
Map<String, Session> sessionWebsockets = CommandWebsocketServer.websockets.get(lessonId);
if (sessionWebsockets == null) {
    sessionWebsockets = new ConcurrentHashMap<String, Session>();
    CommandWebsocketServer.websockets.put(lessonId, sessionWebsockets);
}

String login = websocket.getUserPrincipal().getName();
sessionWebsockets.put(login, websocket);
   }

@OnOpen
public void handleOpen(Session userSession) {
    this.session = userSession;
    System.out.print("session open");
    System.out.print("(" + UploadServlet.uploadTime() + ")");

}

@OnOpen
public void open(final Session session) {
    sessions.add(session);
    /* Send list of students */
    List<Student> students = requestBean.getAllStudents();
    String studentList = jsonStudentList(students);
    try {
        session.getBasicRemote().sendText(studentList);
    } catch (IOException e) {
        log.log(Level.INFO, "[StatusEndpoint] {0}", e.getMessage());
    }
}

@OnOpen
public void start(Session session) {
    this.session = session;
    connections.add(this);
    String message = String.format("* %s %s", nickname, "has joined.");
    broadcast(message);
}

@OnOpen
public void onOpen(@SuppressWarnings("unused") Session session,
        EndpointConfig config) {
    if (config == null) {
        throw new RuntimeException();
    }
}

@OnOpen
public void start(Session session) {
    this.session = session;
    connections.add(this);
    String message = String.format("* %s %s", nickname, "has joined.");
    broadcast(message);
}

@OnOpen
public void open(Session session, @PathParam(value = "user")String user) {
    Session session1 = sessionMap.get(user);
    if (null != session1) {
        try {
            session1.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    sessionMap.put(user, session);
    log.info("*** WebSocket opened from sessionId " + session.getId());
}