【Shiro学习之七】shiro缓存

apahce shiro:1.6.0

Shiro 提供了类似于 Spring 的 Cache 抽象，即 Shiro 本身不实现 Cache，但是对 Cache 进行了又抽象，方便更换不同的底层 Cache 实现。
一、相关组件
1、Cache接口

【Shiro学习之七】shiro缓存
2、CacheManager接口

【Shiro学习之七】shiro缓存
3、CacheManagerAware接口用于注入CacheManager
Shiro内部相应的组件DefaultSecurityManager会自动检测相应的对象（如Realm）是否实现了CacheManagerAware并自动注入相应的CacheManager。

【Shiro学习之七】shiro缓存

二、Realm 缓存

【Shiro学习之七】shiro缓存
Shiro 提供了 CachingRealm，其实现了 CacheManagerAware 接口，提供了缓存的一些基础实现；另外 AuthenticatingRealm 及 AuthorizingRealm 分别提供了对 AuthenticationInfo和AuthorizationInfo 信息的缓存。
当用户修改密码或者修改权限后需要将缓存中的 AuthenticationInfo和AuthorizationInfo清除掉。

package com.github.zhangkaitao.shiro.chapter11.realm;

import com.github.zhangkaitao.shiro.chapter11.entity.User;
import com.github.zhangkaitao.shiro.chapter11.service.UserService;
import com.github.zhangkaitao.shiro.chapter11.service.UserServiceImpl;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;

/**
 * <p>User: Zhang Kaitao
 * <p>Date: 14-1-28
 * <p>Version: 1.0
 */
public class UserRealm extends AuthorizingRealm {

    private UserService userService = new UserServiceImpl();

    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        String username = (String)principals.getPrimaryPrincipal();

        SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
        authorizationInfo.setRoles(userService.findRoles(username));
        authorizationInfo.setStringPermissions(userService.findPermissions(username));
        return authorizationInfo;
    }

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {

        String username = (String)token.getPrincipal();

        User user = userService.findByUsername(username);
        if(user == null) {
            throw new UnknownAccountException();//没找到帐号
        }

        if(Boolean.TRUE.equals(user.getLocked())) {
            throw new LockedAccountException(); //帐号锁定
        }

        //交给AuthenticatingRealm使用CredentialsMatcher进行密码匹配，如果觉得人家的不好可以自定义实现
        SimpleAuthenticationInfo authenticationInfo = new SimpleAuthenticationInfo(
                user.getUsername(), //用户名
                user.getPassword(), //密码
                ByteSource.Util.bytes(user.getCredentialsSalt()),//salt=username+salt
                getName()  //realm name
        );
        return authenticationInfo;
    }

    @Override
    public void clearCachedAuthorizationInfo(PrincipalCollection principals) {
        super.clearCachedAuthorizationInfo(principals);
    }

    @Override
    public void clearCachedAuthenticationInfo(PrincipalCollection principals) {
        super.clearCachedAuthenticationInfo(principals);
    }

    @Override
    public void clearCache(PrincipalCollection principals) {
        super.clearCache(principals);
    }

    public void clearAllCachedAuthorizationInfo() {
        getAuthorizationCache().clear();
    }

    public void clearAllCachedAuthenticationInfo() {
        getAuthenticationCache().clear();
    }

    public void clearAllCache() {
        clearAllCachedAuthenticationInfo();
        clearAllCachedAuthorizationInfo();
    }

}

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