详解Spring Boot Oauth2缓存UserDetails到Ehcache

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;

   }

}

<?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>

@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;

   }

}

@autowired

private userdetailsservice userdetailsservice;