Spring Boot Oauth2緩存UserDetails到Ehcache

Coding01 發(fā)布于2019-08-19 10:53 / 1146人閱讀

摘要：在中有一個(gè)類實(shí)現(xiàn)了接口，該類使用靜態(tài)代理模式為提供緩存功能。該類源碼如下默認(rèn)的屬性值為，該對(duì)象并未實(shí)現(xiàn)緩存。緩存到的具體實(shí)現(xiàn)如下磁盤緩存位置使用歡迎關(guān)注我的項(xiàng)目，僅僅需要運(yùn)行建表，修改數(shù)據(jù)庫的連接配置，即可得到一個(gè)微服務(wù)。

在Spring中有一個(gè)類CachingUserDetailsService實(shí)現(xiàn)了UserDetailsService接口，該類使用靜態(tài)代理模式為UserDetailsService提供緩存功能。該類源碼如下：

CachingUserDetailsService.java

public class CachingUserDetailsService implements UserDetailsService {
    private UserCache userCache = new NullUserCache();
    private final UserDetailsService delegate;

    CachingUserDetailsService(UserDetailsService delegate) {
        this.delegate = delegate;
    }

    public UserCache getUserCache() {
        return this.userCache;
    }

    public void setUserCache(UserCache userCache) {
        this.userCache = userCache;
    }

    public UserDetails loadUserByUsername(String username) {
        UserDetails user = this.userCache.getUserFromCache(username);
        if (user == null) {
            user = this.delegate.loadUserByUsername(username);
        }

        Assert.notNull(user, "UserDetailsService " + this.delegate + " returned null for username " + username + ". This is an interface contract violation");
        this.userCache.putUserInCache(user);
        return user;
    }
}

CachingUserDetailsService默認(rèn)的userCache屬性值為new NullUserCache()，該對(duì)象并未實(shí)現(xiàn)緩存。因?yàn)槲掖蛩闶褂肊hCache來緩存UserDetails，所以需要使用Spring的EhCacheBasedUserCache類，該類是UserCache接口的實(shí)現(xiàn)類，主要是緩存操作。

緩存UserDetails到Ehcache的具體實(shí)現(xiàn)如下：

ehcache.xml

UserDetailsCacheConfig.java

@Slf4j
@Configuration
public class UserDetailsCacheConfig {
    @Autowired
    private CustomUserDetailsService customUserDetailsService;

    @Bean
    public UserCache userCache(){
        try {
            EhCacheBasedUserCache userCache = new EhCacheBasedUserCache();
            val cacheManager = CacheManager.getInstance();
            val cache = cacheManager.getCache("userCache");
            userCache.setCache(cache);
            return userCache;
        } catch (Exception e) {
            e.printStackTrace();
            log.error(e.getMessage());
        }
        return null;
    }

    @Bean
    public UserDetailsService userDetailsService(){
        Constructor ctor = null;
        try {
            ctor = CachingUserDetailsService.class.getDeclaredConstructor(UserDetailsService.class);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }
        Assert.notNull(ctor, "CachingUserDetailsService constructor is null");
        ctor.setAccessible(true);

        CachingUserDetailsService cachingUserDetailsService = BeanUtils.instantiateClass(ctor, customUserDetailsService);
        cachingUserDetailsService.setUserCache(userCache());
        return cachingUserDetailsService;
    }
}

使用

@Autowired
private UserDetailsService userDetailsService;

歡迎關(guān)注我的oauthserver項(xiàng)目，僅僅需要運(yùn)行建表sql，修改數(shù)據(jù)庫的連接配置，即可得到一個(gè)Spring Boot Oauth2 Server微服務(wù)。項(xiàng)目地址https://github.com/jeesun/oauthserver