web-chat/src/main/java/com/uas/demo/dao/MessageDao.java

package com.uas.demo.dao;

import com.uas.demo.model.Message;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public interface MessageDao extends MongoRepository<Message, String> {

	/**
	 * 根据发起者和接收者获取相应状态的消息缓存
	 *
	 * @param senderInfo		消息的发送者信息
	 * @param receiverInfo		消息的接受者信息
	 * @param read				消息是否已读
	 */
	List<Message> findBySenderInfoAndReceiverInfoAndReadOrderByTimeSendAsc(String senderInfo, String receiverInfo, Boolean read);

	/**
	 * 获取当前用户的前3条消息
	 *
	 * @param own			消息的拥有者
	 * @param communicator	消息的关联者
	 * @param read			消息是否已读
	 */
	List<Message> findTop3ByOwnAndCommunicatorAndReadOrderByTimeSendDescStyleAsc(String own, String communicator, Boolean read);

	/**
	 * 统计用户的未读或已读消息的数量
	 *
	 * @param own		用户User Id
	 * @param read		消息阅读状态
	 */
	Long countByOwnAndRead(String own, Boolean read);

	List<Message> findByOwnAndCommunicatorAndTimeSendBetweenOrderByTimeSendAsc(String own, String communicator, Long max, Long min);
}