SpringCacheBasedUserCache 为空

Question

我有使用 spring 引导、spring 安全和 spring 数据的 Web 应用程序。它是无状态的。

我想避免总是为用户访问调用数据库。所以我想使用 SpringCacheBasedUserCache。

@Configuration
@EnableCaching
public class CacheConfig {

    @Bean
    CacheManager cacheManager() {
        SimpleCacheManager cacheManager = new SimpleCacheManager();
        cacheManager.setCaches(Arrays.asList(new ConcurrentMapCache("city"), new ConcurrentMapCache("userCache")));
        return cacheManager;
    }

    @Bean
    public UserCache userCache() throws Exception {

        Cache cache = (Cache) cacheManager().getCache("userCache");
        return new SpringCacheBasedUserCache(cache);
    }
}


@EnableCaching
@Configuration
@EnableWebSecurity
public class ApplicationSecurity extends WebSecurityConfigurerAdapter {
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Override
    public UserDetailsService userDetailsServiceBean() throws Exception {
        return new UserServiceImpl(commerceReposiotry, repository, defaultConfigRepository);
    }
    ...
}

我有一个 class 实现了 UserDetails，另一个实现了 UserDetailsService

@Service
public class UserServiceImpl implements UserDetailsService, UserService {

    private final CommerceRepository commerceReposiotry;
    private final UserAppRepository repository;
    private final DefaultConfigRepository defaultConfigRepository;

    @Autowired
    private UserCache userCache;

    @Autowired
    private PasswordEncoder passwordEncoder;

    @Autowired
    public UserServiceImpl(final CommerceRepository commerceReposiotry, final UserAppRepository repository, final DefaultConfigRepository defaultConfigRepository) {
        this.commerceReposiotry = commerceReposiotry;
        this.repository = repository;
        this.defaultConfigRepository = defaultConfigRepository;
    }


    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {

        UserDetails user = userCache.getUserFromCache(username);
        UserApp userapp = null;

        if (user == null) {
            userapp = repository.findByUsername(username);
        }

        if (userapp == null) {
            throw new UsernameNotFoundException("Username " + username + " not found");
        }

        userCache.putUserInCache(user);

        return new CustomUserDetails(userapp);
    }
    ...
}

在loadUserByUsername方法中，userCache为空

Answer 1

要么将 @Bean 放在 userDetailsServiceBean 方法上，要么（按照建议）从 UserDetailsService 中完全删除缓存并将其包装在 CachingUserDetailsService 中，而只是覆盖userDetailsService 方法代替。

@Configuration
@EnableWebSecurity
public class ApplicationSecurity extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserCache userCache;

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Override
    public UserDetailsService userDetailsService() throws Exception {

        UserServiceImpl userService = new UserServiceImpl(commerceReposiotry, repository, defaultConfigRepository);
        CachingUserDetailsService cachingUserService = new CachingUserDetailsService(userService);
        cachingUserService.setUserCache(this.userCache);
        return cachingUserService;
    }
    ...
}

您的其他配置上已经有 @EnableCaching，因此无需再次进行。只需将缓存注入配置 class 并构造一个 CachingUserDetailsService 委托给您的 UserDetailsService 来检索用户。

当然，您必须从自己的 UserDetailsService 中删除缓存，现在可以专注于用户 management/retrieval，而不是与缓存混合。

Edit(1): 构造函数没有 public 使创建 bean 变得更加困难。这可以使用 BeanUtils 和 ClassUtils 来实现。用以下内容替换对 new 的调用应该创建一个实例。

private UserDetailsService cachingUserDetailsService(UserDetailsService delegate) {
    Constructor<CachingUserDetailsService> ctor = ClassUtils.getConstructorIfAvailable(CachingUserDetailsService.class, UserDetailsService.class);
    return BeanUtils.instantiateClass(ctor, delegate);
}

编辑 (2): 显然我已经遇到过一次（大约 2 年前）并为此注册了 this issue。

SpringCacheBasedUserCache 为空

SpringCacheBasedUserCache is null

spring

spring-security

spring-boot

spring-data

spring-cache