当前位置：首页 > news >正文

LlamaIndex 高并发优化：线程池、异步处理与缓存策略实战

news 2026/4/15 0:07:26

一、前言

LlamaIndex 高并发优化：线程池、异步处理与缓存策略实战是 Java 后端开发中的核心知识点。本文覆盖LlamaIndex、高并发、性能优化，配有完整可运行的代码示例。

二、核心实现

2.1 SpringBoot 项目结构

// 标准 SpringBoot 控制器 @RestController @RequestMapping("/api/users") public class UserController { private final UserService userService; public UserController(UserService userService) { this.userService = userService; } @GetMapping("/{id}") public Result<UserDTO> getUser(@PathVariable Long id) { return Result.ok(userService.getUserById(id)); } @PostMapping public Result<Void> createUser(@RequestBody @Valid CreateUserRequest request) { userService.createUser(request); return Result.ok(); } }

2.2 Service 层实现

@Service @Slf4j public class UserService { private final UserRepository userRepository; private final PasswordEncoder passwordEncoder; @Transactional(rollbackFor = Exception.class) public UserDTO createUser(CreateUserRequest request) { // 参数校验 if (userRepository.existsByEmail(request.getEmail())) { throw new BusinessException("邮箱已被注册"); } // 密码加密 User user = new User(); user.setEmail(request.getEmail()); user.setPassword(passwordEncoder.encode(request.getPassword())); user.setCreatedAt(LocalDateTime.now()); User saved = userRepository.save(user); log.info("创建用户成功: {}", saved.getEmail()); return toDTO(saved); } @Cacheable(value = "user", key = "#id") public UserDTO getUserById(Long id) { return userRepository.findById(id) .map(this::toDTO) .orElseThrow(() -> new ResourceNotFoundException("用户不存在")); } private UserDTO toDTO(User user) { return new UserDTO(user.getId(), user.getEmail(), user.getCreatedAt()); } }

三、异常处理与全局响应

3.1 统一异常处理

@RestControllerAdvice public class GlobalExceptionHandler { @ExceptionHandler(BusinessException.class) public Result<Void> handleBusiness(BusinessException e) { log.warn("业务异常: {}", e.getMessage()); return Result.fail(e.getCode(), e.getMessage()); } @ExceptionHandler(MethodArgumentNotValidException.class) public Result<Void> handleValidation(MethodArgumentNotValidException e) { String message = e.getBindingResult().getFieldErrors().stream() .map(FieldError::getDefaultMessage) .collect(Collectors.joining(", ")); return Result.fail(400, message); } @ExceptionHandler(Exception.class) public Result<Void> handleOther(Exception e) { log.error("未知异常", e); return Result.fail(500, "系统繁忙，请稍后重试"); } }

3.2 统一响应封装

@Data public class Result<T> { private int code; private String message; private T data; public static <T> Result<T> ok() { return ok(null); } public static <T> Result<T> ok(T data) { Result<T> r = new Result<>(); r.setCode(0); r.setMessage("success"); r.setData(data); return r; } public static <T> Result<T> fail(int code, String message) { Result<T> r = new Result<>(); r.setCode(code); r.setMessage(message); return r; } }

四、数据库操作

4.1 MyBatis-Plus CRUD

@Mapper public interface UserMapper extends BaseMapper<User> { @Select("SELECT * FROM users WHERE email = #{email} LIMIT 1") User findByEmail(@Param("email") String email); } @Service public class UserService { @Autowired private UserMapper userMapper; public Page<User> listUsers(int page, int pageSize) { Page<User> p = new Page<>(page, pageSize); return userMapper.selectPage(p, new QueryWrapper<User>() .eq("status", 1) .orderByDesc("created_at")); } }

五、性能优化

5.1 连接池配置

# application.yml spring: datasource: url: jdbc:mysql://localhost:3306/mydb?useSSL=false&serverTimezone=Asia/Shanghai driver-class-name: com.mysql.cj.jdbc.Driver username: root password: secret hikari: maximum-pool-size: 20 minimum-idle: 5 idle-timeout: 300000 connection-timeout: 20000 max-lifetime: 1200000

5.2 异步任务

@Async("taskExecutor") public CompletableFuture<Void> sendEmail(String to, String content) { log.info("发送邮件到: {}", to); // 邮件发送逻辑 return CompletableFuture.completedFuture(null); }