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				/** 
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				 * 消息模型。 
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				 */ 
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				"use strict"; 
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				let RedisClient = require('../repository/redis/redis.client'); 
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				let redisClient = RedisClient.redisClient(); 
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				let BaseModel = require('./base.model'); 
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				let modelUtil = require('../util/modelUtil'); 
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				const PAGE_KEY = require('../include/commons').REDIS_KEY; 
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				class Messages extends BaseModel { 
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				    constructor() { 
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				        super(); 
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				    } 
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				    /** 
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				     * 根据topicId获取对应的议题的信息列表 
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				     * @param topicId 
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				     */ 
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				    getMessagesByTopicId(topicId){ 
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				    } 
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				    /** 
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				     * 分页 
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				     * 根据topicId获取对应的议题的成员信息 
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				     * @param topicId 
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				     */ 
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				    getMessagesByTopicIdForPage(topicId,page,pagesize){ 
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				    } 
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				    /** 
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				     * 根据sessionId获取对应的会话的信息列表 
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				     * @param sessionId 
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				     */ 
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				    getMessagesBySession(sessionId){ 
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				    } 
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				    /** 
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				     * 分页 
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				     * 根据sessionId获取对应的会话的信息列表 
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				     * @param sessionId 
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				     */ 
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				    getMessagesBySessionForPage(sessionId,page,pagesize){ 
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				    } 
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				    /** 
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				     * 根据消息ID获取单条消息 
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				     * @param messageId 
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				     */ 
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				    getMessagesByid(messageId){ 
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				    } 
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				} 
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				// Expose class 
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				module.exports = Messages; 
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