package com.vincent.rsf.server.ai.service.impl;
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import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
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import com.vincent.rsf.framework.common.Cools;
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import com.vincent.rsf.framework.exception.CoolException;
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import com.vincent.rsf.server.ai.config.AiDefaults;
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import com.vincent.rsf.server.ai.dto.AiChatMemoryDto;
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import com.vincent.rsf.server.ai.dto.AiChatMessageDto;
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import com.vincent.rsf.server.ai.dto.AiChatSessionPinRequest;
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import com.vincent.rsf.server.ai.dto.AiChatSessionRenameRequest;
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import com.vincent.rsf.server.ai.dto.AiChatSessionDto;
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import com.vincent.rsf.server.ai.entity.AiChatMessage;
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import com.vincent.rsf.server.ai.entity.AiChatSession;
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import com.vincent.rsf.server.ai.mapper.AiChatMessageMapper;
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import com.vincent.rsf.server.ai.mapper.AiChatSessionMapper;
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import com.vincent.rsf.server.ai.service.AiChatMemoryService;
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import com.vincent.rsf.server.system.enums.StatusType;
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import lombok.RequiredArgsConstructor;
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import org.springframework.stereotype.Service;
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import org.springframework.util.StringUtils;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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@Service
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@RequiredArgsConstructor
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public class AiChatMemoryServiceImpl implements AiChatMemoryService {
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private final AiChatSessionMapper aiChatSessionMapper;
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private final AiChatMessageMapper aiChatMessageMapper;
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/**
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* 读取会话记忆快照。
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* 返回结果同时包含完整落库历史、短期记忆窗口以及摘要/事实记忆，
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* 便于调用方按不同用途选择数据粒度。
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*/
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@Override
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public AiChatMemoryDto getMemory(Long userId, Long tenantId, String promptCode, Long sessionId) {
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ensureIdentity(userId, tenantId);
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String resolvedPromptCode = requirePromptCode(promptCode);
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AiChatSession session = sessionId == null
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? findLatestSession(userId, tenantId, resolvedPromptCode)
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: getSession(sessionId, userId, tenantId, resolvedPromptCode);
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if (session == null) {
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return AiChatMemoryDto.builder()
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.sessionId(null)
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.memorySummary(null)
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.memoryFacts(null)
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.recentMessageCount(0)
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.persistedMessages(List.of())
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.shortMemoryMessages(List.of())
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.build();
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}
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List<AiChatMessageDto> persistedMessages = listMessages(session.getId());
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List<AiChatMessageDto> shortMemoryMessages = tailMessagesByRounds(persistedMessages, AiDefaults.MEMORY_RECENT_ROUNDS);
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return AiChatMemoryDto.builder()
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.sessionId(session.getId())
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.memorySummary(session.getMemorySummary())
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.memoryFacts(session.getMemoryFacts())
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.recentMessageCount(shortMemoryMessages.size())
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.persistedMessages(persistedMessages)
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.shortMemoryMessages(shortMemoryMessages)
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.build();
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}
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/**
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* 查询当前用户在某个 Prompt 下的会话列表。
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* 列表只返回用于侧边栏展示的摘要信息，不返回完整对话内容。
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*/
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@Override
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public List<AiChatSessionDto> listSessions(Long userId, Long tenantId, String promptCode, String keyword) {
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ensureIdentity(userId, tenantId);
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String resolvedPromptCode = requirePromptCode(promptCode);
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List<AiChatSession> sessions = aiChatSessionMapper.selectList(new LambdaQueryWrapper<AiChatSession>()
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.eq(AiChatSession::getUserId, userId)
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.eq(AiChatSession::getTenantId, tenantId)
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.eq(AiChatSession::getPromptCode, resolvedPromptCode)
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.eq(AiChatSession::getDeleted, 0)
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.eq(AiChatSession::getStatus, StatusType.ENABLE.val)
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.like(StringUtils.hasText(keyword), AiChatSession::getTitle, keyword == null ? null : keyword.trim())
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.orderByDesc(AiChatSession::getPinned)
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.orderByDesc(AiChatSession::getLastMessageTime)
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.orderByDesc(AiChatSession::getId));
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if (Cools.isEmpty(sessions)) {
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return List.of();
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}
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List<AiChatSessionDto> result = new ArrayList<>();
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for (AiChatSession session : sessions) {
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result.add(buildSessionDto(session));
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}
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return result;
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}
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/**
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* 解析本轮请求应该落到哪个会话。
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* 如果前端带了 sessionId 则做归属校验并复用；否则自动创建新会话。
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*/
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@Override
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public AiChatSession resolveSession(Long userId, Long tenantId, String promptCode, Long sessionId, String titleSeed) {
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ensureIdentity(userId, tenantId);
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String resolvedPromptCode = requirePromptCode(promptCode);
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if (sessionId != null) {
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return getSession(sessionId, userId, tenantId, resolvedPromptCode);
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}
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Date now = new Date();
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AiChatSession session = new AiChatSession()
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.setTitle(buildSessionTitle(titleSeed))
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.setPromptCode(resolvedPromptCode)
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.setUserId(userId)
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.setTenantId(tenantId)
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.setLastMessageTime(now)
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.setPinned(0)
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.setStatus(StatusType.ENABLE.val)
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.setDeleted(0)
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.setCreateBy(userId)
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.setCreateTime(now)
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.setUpdateBy(userId)
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.setUpdateTime(now);
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aiChatSessionMapper.insert(session);
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return session;
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}
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/**
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* 落库保存一整轮对话。
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* 这里会顺序写入本轮用户消息和模型回复，并在最后刷新会话标题、最后活跃时间和记忆画像。
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*/
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@Override
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public void saveRound(AiChatSession session, Long userId, Long tenantId, List<AiChatMessageDto> memoryMessages, String assistantContent) {
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if (session == null || session.getId() == null) {
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throw new CoolException("AI 会话不存在");
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}
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ensureIdentity(userId, tenantId);
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List<AiChatMessageDto> normalizedMessages = normalizeMessages(memoryMessages);
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if (normalizedMessages.isEmpty()) {
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throw new CoolException("本轮没有可保存的对话消息");
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}
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int nextSeqNo = findNextSeqNo(session.getId());
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Date now = new Date();
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for (AiChatMessageDto message : normalizedMessages) {
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aiChatMessageMapper.insert(buildMessageEntity(session.getId(), nextSeqNo++, message.getRole(), message.getContent(), userId, tenantId, now));
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}
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if (StringUtils.hasText(assistantContent)) {
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aiChatMessageMapper.insert(buildMessageEntity(session.getId(), nextSeqNo, "assistant", assistantContent, userId, tenantId, now));
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}
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AiChatSession update = new AiChatSession()
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.setId(session.getId())
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.setTitle(resolveUpdatedTitle(session.getTitle(), normalizedMessages))
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.setLastMessageTime(now)
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.setUpdateBy(userId)
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.setUpdateTime(now);
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aiChatSessionMapper.updateById(update);
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refreshMemoryProfile(session.getId(), userId);
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}
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/** 删除整个会话及其消息。 */
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@Override
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public void removeSession(Long userId, Long tenantId, Long sessionId) {
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ensureIdentity(userId, tenantId);
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if (sessionId == null) {
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throw new CoolException("AI 会话 ID 不能为空");
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}
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AiChatSession session = aiChatSessionMapper.selectOne(new LambdaQueryWrapper<AiChatSession>()
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.eq(AiChatSession::getId, sessionId)
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.eq(AiChatSession::getUserId, userId)
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.eq(AiChatSession::getTenantId, tenantId)
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.eq(AiChatSession::getDeleted, 0)
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.last("limit 1"));
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if (session == null) {
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throw new CoolException("AI 会话不存在或无权删除");
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}
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Date now = new Date();
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AiChatSession updateSession = new AiChatSession()
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.setId(sessionId)
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.setDeleted(1)
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.setUpdateBy(userId)
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.setUpdateTime(now);
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aiChatSessionMapper.updateById(updateSession);
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List<AiChatMessage> messages = aiChatMessageMapper.selectList(new LambdaQueryWrapper<AiChatMessage>()
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.eq(AiChatMessage::getSessionId, sessionId)
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.eq(AiChatMessage::getDeleted, 0));
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for (AiChatMessage message : messages) {
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AiChatMessage updateMessage = new AiChatMessage()
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.setId(message.getId())
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.setDeleted(1);
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aiChatMessageMapper.updateById(updateMessage);
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}
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}
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/** 更新会话标题并返回最新会话摘要。 */
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@Override
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public AiChatSessionDto renameSession(Long userId, Long tenantId, Long sessionId, AiChatSessionRenameRequest request) {
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ensureIdentity(userId, tenantId);
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if (request == null || !StringUtils.hasText(request.getTitle())) {
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throw new CoolException("会话标题不能为空");
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}
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AiChatSession session = requireOwnedSession(sessionId, userId, tenantId);
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Date now = new Date();
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AiChatSession update = new AiChatSession()
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.setId(sessionId)
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.setTitle(buildSessionTitle(request.getTitle()))
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.setUpdateBy(userId)
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.setUpdateTime(now);
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aiChatSessionMapper.updateById(update);
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return buildSessionDto(requireOwnedSession(sessionId, userId, tenantId));
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}
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/** 更新会话置顶状态。 */
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@Override
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public AiChatSessionDto pinSession(Long userId, Long tenantId, Long sessionId, AiChatSessionPinRequest request) {
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ensureIdentity(userId, tenantId);
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if (request == null || request.getPinned() == null) {
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throw new CoolException("置顶状态不能为空");
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}
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AiChatSession session = requireOwnedSession(sessionId, userId, tenantId);
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Date now = new Date();
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AiChatSession update = new AiChatSession()
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.setId(sessionId)
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.setPinned(Boolean.TRUE.equals(request.getPinned()) ? 1 : 0)
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.setUpdateBy(userId)
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.setUpdateTime(now);
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aiChatSessionMapper.updateById(update);
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return buildSessionDto(requireOwnedSession(sessionId, userId, tenantId));
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}
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/** 清空某个会话的全部消息和派生记忆字段。 */
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@Override
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public void clearSessionMemory(Long userId, Long tenantId, Long sessionId) {
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ensureIdentity(userId, tenantId);
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AiChatSession session = requireOwnedSession(sessionId, userId, tenantId);
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List<AiChatMessage> messages = aiChatMessageMapper.selectList(new LambdaQueryWrapper<AiChatMessage>()
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.eq(AiChatMessage::getSessionId, sessionId)
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.eq(AiChatMessage::getDeleted, 0));
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for (AiChatMessage message : messages) {
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aiChatMessageMapper.updateById(new AiChatMessage()
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.setId(message.getId())
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.setDeleted(1));
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}
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aiChatSessionMapper.updateById(new AiChatSession()
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.setId(sessionId)
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.setMemorySummary(null)
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.setMemoryFacts(null)
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.setUpdateBy(userId)
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.setUpdateTime(new Date())
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.setLastMessageTime(session.getCreateTime()));
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}
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/** 只保留最近一轮问答，用于手动裁剪长会话。 */
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@Override
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public void retainLatestRound(Long userId, Long tenantId, Long sessionId) {
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ensureIdentity(userId, tenantId);
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requireOwnedSession(sessionId, userId, tenantId);
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List<AiChatMessage> records = listMessageRecords(sessionId);
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if (records.isEmpty()) {
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return;
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}
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List<AiChatMessage> retained = tailMessageRecordsByRounds(records, 1);
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for (AiChatMessage message : records) {
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boolean shouldKeep = retained.stream().anyMatch(item -> item.getId().equals(message.getId()));
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if (!shouldKeep) {
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aiChatMessageMapper.updateById(new AiChatMessage()
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.setId(message.getId())
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.setDeleted(1));
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}
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}
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refreshMemoryProfile(sessionId, userId);
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}
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private AiChatSession findLatestSession(Long userId, Long tenantId, String promptCode) {
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return aiChatSessionMapper.selectOne(new LambdaQueryWrapper<AiChatSession>()
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.eq(AiChatSession::getUserId, userId)
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.eq(AiChatSession::getTenantId, tenantId)
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.eq(AiChatSession::getPromptCode, promptCode)
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.eq(AiChatSession::getDeleted, 0)
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.eq(AiChatSession::getStatus, StatusType.ENABLE.val)
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.orderByDesc(AiChatSession::getLastMessageTime)
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.orderByDesc(AiChatSession::getId)
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.last("limit 1"));
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}
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private AiChatSession getSession(Long sessionId, Long userId, Long tenantId, String promptCode) {
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AiChatSession session = aiChatSessionMapper.selectOne(new LambdaQueryWrapper<AiChatSession>()
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.eq(AiChatSession::getId, sessionId)
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.eq(AiChatSession::getUserId, userId)
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.eq(AiChatSession::getTenantId, tenantId)
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.eq(AiChatSession::getPromptCode, promptCode)
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.eq(AiChatSession::getDeleted, 0)
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.eq(AiChatSession::getStatus, StatusType.ENABLE.val)
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.last("limit 1"));
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if (session == null) {
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throw new CoolException("AI 会话不存在或无权访问");
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}
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return session;
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}
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private AiChatSession requireOwnedSession(Long sessionId, Long userId, Long tenantId) {
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if (sessionId == null) {
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throw new CoolException("AI 会话 ID 不能为空");
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}
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AiChatSession session = aiChatSessionMapper.selectOne(new LambdaQueryWrapper<AiChatSession>()
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.eq(AiChatSession::getId, sessionId)
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.eq(AiChatSession::getUserId, userId)
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.eq(AiChatSession::getTenantId, tenantId)
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.eq(AiChatSession::getDeleted, 0)
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.eq(AiChatSession::getStatus, StatusType.ENABLE.val)
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.last("limit 1"));
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if (session == null) {
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throw new CoolException("AI 会话不存在或无权访问");
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}
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return session;
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}
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private List<AiChatMessageDto> listMessages(Long sessionId) {
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List<AiChatMessage> records = listMessageRecords(sessionId);
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if (Cools.isEmpty(records)) {
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return List.of();
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}
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List<AiChatMessageDto> messages = new ArrayList<>();
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for (AiChatMessage record : records) {
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if (!StringUtils.hasText(record.getContent())) {
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continue;
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}
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AiChatMessageDto item = new AiChatMessageDto();
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item.setRole(record.getRole());
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item.setContent(record.getContent());
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messages.add(item);
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}
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return messages;
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}
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private List<AiChatMessageDto> normalizeMessages(List<AiChatMessageDto> memoryMessages) {
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/** 清洗前端上传的内存消息，只允许 user/assistant 两类角色落库。 */
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List<AiChatMessageDto> normalized = new ArrayList<>();
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if (Cools.isEmpty(memoryMessages)) {
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return normalized;
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}
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for (AiChatMessageDto item : memoryMessages) {
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if (item == null || !StringUtils.hasText(item.getContent())) {
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continue;
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}
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String role = item.getRole() == null ? "user" : item.getRole().toLowerCase();
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if ("system".equals(role)) {
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continue;
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}
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AiChatMessageDto normalizedItem = new AiChatMessageDto();
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normalizedItem.setRole("assistant".equals(role) ? "assistant" : "user");
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normalizedItem.setContent(item.getContent().trim());
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normalized.add(normalizedItem);
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}
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return normalized;
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}
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private List<AiChatMessage> listMessageRecords(Long sessionId) {
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return aiChatMessageMapper.selectList(new LambdaQueryWrapper<AiChatMessage>()
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.eq(AiChatMessage::getSessionId, sessionId)
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.eq(AiChatMessage::getDeleted, 0)
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.orderByAsc(AiChatMessage::getSeqNo)
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.orderByAsc(AiChatMessage::getId));
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}
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private int findNextSeqNo(Long sessionId) {
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AiChatMessage lastMessage = aiChatMessageMapper.selectOne(new LambdaQueryWrapper<AiChatMessage>()
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.eq(AiChatMessage::getSessionId, sessionId)
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.eq(AiChatMessage::getDeleted, 0)
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.orderByDesc(AiChatMessage::getSeqNo)
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.orderByDesc(AiChatMessage::getId)
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.last("limit 1"));
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return lastMessage == null || lastMessage.getSeqNo() == null ? 1 : lastMessage.getSeqNo() + 1;
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}
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private AiChatMessage buildMessageEntity(Long sessionId, int seqNo, String role, String content, Long userId, Long tenantId, Date createTime) {
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return new AiChatMessage()
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.setSessionId(sessionId)
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.setSeqNo(seqNo)
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.setRole(role)
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.setContent(content)
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.setContentLength(content == null ? 0 : content.length())
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.setUserId(userId)
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.setTenantId(tenantId)
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.setDeleted(0)
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.setCreateBy(userId)
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.setCreateTime(createTime);
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}
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private String resolveUpdatedTitle(String currentTitle, List<AiChatMessageDto> memoryMessages) {
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if (StringUtils.hasText(currentTitle)) {
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return currentTitle;
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}
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for (AiChatMessageDto item : memoryMessages) {
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if ("user".equals(item.getRole()) && StringUtils.hasText(item.getContent())) {
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return buildSessionTitle(item.getContent());
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}
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}
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return null;
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}
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private String buildSessionTitle(String titleSeed) {
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/**
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* 把首轮用户问题压缩成适合作为会话标题的短摘要。
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* 这里会去掉换行、连续空白，并优先在自然语义断点处截断。
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*/
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if (!StringUtils.hasText(titleSeed)) {
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throw new CoolException("AI 会话标题不能为空");
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}
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String title = titleSeed.trim()
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.replace("\r", " ")
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.replace("\n", " ")
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.replaceAll("\\s+", " ");
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int punctuationIndex = findSummaryBreakIndex(title);
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if (punctuationIndex > 0) {
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title = title.substring(0, punctuationIndex).trim();
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}
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return title.length() > 48 ? title.substring(0, 48) : title;
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}
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private int findSummaryBreakIndex(String title) {
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String[] separators = {"。", "！", "？", ".", "!", "?"};
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int result = -1;
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for (String separator : separators) {
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int index = title.indexOf(separator);
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if (index > 0 && (result < 0 || index < result)) {
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result = index;
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}
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}
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return result;
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}
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private AiChatSessionDto buildSessionDto(AiChatSession session) {
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AiChatMessage lastMessage = aiChatMessageMapper.selectOne(new LambdaQueryWrapper<AiChatMessage>()
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.eq(AiChatMessage::getSessionId, session.getId())
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.eq(AiChatMessage::getDeleted, 0)
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.orderByDesc(AiChatMessage::getSeqNo)
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.orderByDesc(AiChatMessage::getId)
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.last("limit 1"));
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return AiChatSessionDto.builder()
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.sessionId(session.getId())
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.title(session.getTitle())
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.promptCode(session.getPromptCode())
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.pinned(session.getPinned() != null && session.getPinned() == 1)
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.lastMessagePreview(buildLastMessagePreview(lastMessage))
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.lastMessageTime(session.getLastMessageTime())
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.build();
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}
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private String buildLastMessagePreview(AiChatMessage message) {
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if (message == null || !StringUtils.hasText(message.getContent())) {
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return null;
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}
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String preview = message.getContent().trim()
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.replace("\r", " ")
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.replace("\n", " ")
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.replaceAll("\\s+", " ");
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String prefix = "assistant".equalsIgnoreCase(message.getRole()) ? "AI: " : "你: ";
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String normalized = prefix + preview;
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return normalized.length() > 80 ? normalized.substring(0, 80) : normalized;
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}
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private void refreshMemoryProfile(Long sessionId, Long userId) {
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/**
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* 重新计算会话的摘要记忆和关键事实。
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* 这是“持久化消息”和“模型上下文治理”之间的桥梁方法。
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*/
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List<AiChatMessageDto> messages = listMessages(sessionId);
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List<AiChatMessageDto> shortMemoryMessages = tailMessagesByRounds(messages, AiDefaults.MEMORY_RECENT_ROUNDS);
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List<AiChatMessageDto> historyMessages = messages.size() > shortMemoryMessages.size()
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? messages.subList(0, messages.size() - shortMemoryMessages.size())
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: List.of();
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String memorySummary = historyMessages.size() >= AiDefaults.MEMORY_SUMMARY_TRIGGER_MESSAGES
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? buildMemorySummary(historyMessages)
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: null;
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String memoryFacts = buildMemoryFacts(messages);
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AiChatMessage lastMessage = aiChatMessageMapper.selectOne(new LambdaQueryWrapper<AiChatMessage>()
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.eq(AiChatMessage::getSessionId, sessionId)
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.eq(AiChatMessage::getDeleted, 0)
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.orderByDesc(AiChatMessage::getSeqNo)
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.orderByDesc(AiChatMessage::getId)
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.last("limit 1"));
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aiChatSessionMapper.updateById(new AiChatSession()
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.setId(sessionId)
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.setMemorySummary(memorySummary)
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.setMemoryFacts(memoryFacts)
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.setLastMessageTime(lastMessage == null ? null : lastMessage.getCreateTime())
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.setUpdateBy(userId)
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.setUpdateTime(new Date()));
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}
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private List<AiChatMessageDto> tailMessagesByRounds(List<AiChatMessageDto> source, int rounds) {
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/** 按“用户发言轮次”裁剪最近消息，而不是简单按条数截断。 */
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if (Cools.isEmpty(source) || rounds <= 0) {
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return List.of();
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}
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int userCount = 0;
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int startIndex = source.size();
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for (int i = source.size() - 1; i >= 0; i--) {
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AiChatMessageDto item = source.get(i);
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startIndex = i;
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if (item != null && "user".equalsIgnoreCase(item.getRole())) {
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userCount++;
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if (userCount >= rounds) {
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break;
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}
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}
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}
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return new ArrayList<>(source.subList(Math.max(0, startIndex), source.size()));
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}
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private List<AiChatMessage> tailMessageRecordsByRounds(List<AiChatMessage> source, int rounds) {
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if (Cools.isEmpty(source) || rounds <= 0) {
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return List.of();
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}
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int userCount = 0;
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int startIndex = source.size();
|
for (int i = source.size() - 1; i >= 0; i--) {
|
AiChatMessage item = source.get(i);
|
startIndex = i;
|
if (item != null && "user".equalsIgnoreCase(item.getRole())) {
|
userCount++;
|
if (userCount >= rounds) {
|
break;
|
}
|
}
|
}
|
return new ArrayList<>(source.subList(Math.max(0, startIndex), source.size()));
|
}
|
|
private String buildMemorySummary(List<AiChatMessageDto> historyMessages) {
|
/** 为较早历史生成可直接插入系统消息的文本摘要。 */
|
StringBuilder builder = new StringBuilder("较早对话摘要:\n");
|
for (AiChatMessageDto item : historyMessages) {
|
if (item == null || !StringUtils.hasText(item.getContent())) {
|
continue;
|
}
|
String prefix = "assistant".equalsIgnoreCase(item.getRole()) ? "- AI: " : "- 用户: ";
|
String content = compactText(item.getContent(), 120);
|
if (!StringUtils.hasText(content)) {
|
continue;
|
}
|
builder.append(prefix).append(content).append("\n");
|
if (builder.length() >= AiDefaults.MEMORY_SUMMARY_MAX_LENGTH) {
|
break;
|
}
|
}
|
return compactText(builder.toString(), AiDefaults.MEMORY_SUMMARY_MAX_LENGTH);
|
}
|
|
private String buildMemoryFacts(List<AiChatMessageDto> messages) {
|
/** 从最近用户关注点中提炼关键事实，作为轻量持久记忆。 */
|
if (Cools.isEmpty(messages)) {
|
return null;
|
}
|
StringBuilder builder = new StringBuilder("关键事实:\n");
|
int userFacts = 0;
|
for (int i = messages.size() - 1; i >= 0 && userFacts < 4; i--) {
|
AiChatMessageDto item = messages.get(i);
|
if (item == null || !"user".equalsIgnoreCase(item.getRole()) || !StringUtils.hasText(item.getContent())) {
|
continue;
|
}
|
builder.append("- 用户关注: ").append(compactText(item.getContent(), 100)).append("\n");
|
userFacts++;
|
}
|
return userFacts == 0 ? null : compactText(builder.toString(), AiDefaults.MEMORY_FACTS_MAX_LENGTH);
|
}
|
|
private String compactText(String content, int maxLength) {
|
if (!StringUtils.hasText(content)) {
|
return null;
|
}
|
String normalized = content.trim()
|
.replace("\r", " ")
|
.replace("\n", " ")
|
.replaceAll("\\s+", " ");
|
return normalized.length() > maxLength ? normalized.substring(0, maxLength) : normalized;
|
}
|
|
private void ensureIdentity(Long userId, Long tenantId) {
|
if (userId == null) {
|
throw new CoolException("当前登录用户不存在");
|
}
|
if (tenantId == null) {
|
throw new CoolException("当前租户不存在");
|
}
|
}
|
|
private String requirePromptCode(String promptCode) {
|
if (!StringUtils.hasText(promptCode)) {
|
throw new CoolException("Prompt 编码不能为空");
|
}
|
return promptCode;
|
}
|
}
|
