詳解Spring Boot Oauth2緩存UserDetails到Ehcache

更新時(shí)間：2018年08月08日 11:11:41 作者：五毛程序員

這篇文章主要介紹了詳解Spring Boot Oauth2緩存UserDetails到Ehcache，小編覺得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過來看看吧

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

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">
  <!-- 磁盤緩存位置 -->
  <diskStore path="java.io.tmpdir" />

  <cache name="userCache"
      maxElementsInMemory="0"
      eternal="true"
      overflowToDisk="true"
      diskPersistent="true"
      memoryStoreEvictionPolicy="LRU">
  </cache>
</ehcache>

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<CachingUserDetailsService> 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;

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以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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