|  | @ -476,6 +476,7 @@ class Sessions extends RedisModel {
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				|  |  |                     }
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				|  |  | 
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				|  |  |                     messages.saveMessageToRedis(sessionId, sessionType, messageId, message);
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				|  |  |                     Sessions.updateParticipantLastFetchTime(sessionId,message.sender_id,message.timestamp.getTime());
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				|  |  |                     messages.saveMessageToMysql(sessionId, sessionType, messageId, message, function (err, res) {
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				|  |  |                         if (err) {
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				|  |  |                             ModelUtil.emitError(self.eventEmitter, {message: "Failed to save message to mysql: " + err});
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				|  | @ -525,8 +526,11 @@ class Sessions extends RedisModel {
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				|  |  |                     //更新消息相关
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				|  |  |                     return messages.saveMessageToRedis(sessionId, sessionType, messageId, message);
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				|  |  |                 }).then(function (res) {
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				|  |  |                     //更新最后一次消息获取时间
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				|  |  |                     Sessions.updateParticipantLastFetchTime(sessionId,message.sender_id,message.timestamp.getTime());
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				|  |  |                     //更新session的最后一条聊天记录
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				|  |  |                     return Messages.updateLastContent(session_key, sessionType, name, message);
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				|  |  | 
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				|  |  |                 }).then(function (res) {
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				|  |  |                     //操作mysql数据库
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				|  |  |                     messages.saveMessageToMysql(sessionId, sessionType, messageId, message);
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				|  | @ -602,9 +606,8 @@ class Sessions extends RedisModel {
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				|  |  |      * @param sessionId
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				|  |  |      * @param userId
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				|  |  |      */
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				|  |  |     static updateParticipantLastFetchTime(sessionId, userId) {
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				|  |  |     static updateParticipantLastFetchTime(sessionId, userId,score) {
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				|  |  |         let participantsKey = RedisModel.makeRedisKey(REDIS_KEYS.SessionParticipants, sessionId);
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				|  |  |         let score = new Date().getTime();
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				|  |  |         redis.zaddAsync(participantsKey, score, userId)
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				|  |  |             .then(function (res) {
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				|  |  |                 logger.info("update participant last fetch time success.");
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