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详解Spring Boot Oauth2缓存UserDetails到Ehcache

2019年07月19日  | 移动技术网IT编程  | 我要评论

在spring中有一个类cachinguserdetailsservice实现了userdetailsservice接口，该类使用静态代理模式为userdetailsservice提供缓存功能。该类源码如下：

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默认的usercache属性值为new nullusercache()，该对象并未实现缓存。因为我打算使用ehcache来缓存userdetails，所以需要使用spring的ehcachebasedusercache类，该类是usercache接口的实现类，主要是缓存操作。

缓存userdetails到ehcache的具体实现如下：

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">
  <!-- 磁盘缓存位置 -->
  <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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