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
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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
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<?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
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@slf4j@configurationpublic 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
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@autowiredprivate userdetailsservice userdetailsservice; |
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原文链接：http://www.cnblogs.com/rainmer/p/9417108.html
