Shrio's Cache Management - Notes

CacheManager cache management, mainly caches role data and permission information, avoids needing to obtain data from the database each time authorization, and can directly obtain it from the cache to improve system performance.

1. Create RedisCacheManager using CacheManager interface

package com.springshirodemo.cache;

import javax.annotation.Resource;

import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.apache.shiro.cache.CacheManager;


public class RedisCacheManager implements CacheManager {

	@Resource
	private RdisCache rdisCache;
	
	@Override
	public <K, V> Cache<K, V> getCache(String arg0) throws CacheException {
		// TODO Auto-generated method stub
		return rdisCache;
	}

}

2.RedisCache uses the CacheManager interface

package com.springshirodemo.cache;

import java.util.Collection;
import java.util.Set;

import javax.annotation.Resource;

import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.springframework.stereotype.Component;
import org.springframework.util.SerializationUtils;

import com.springshirodemo.util.JedisUtil;

@Component
public class RdisCache<K,V> implements Cache<K, V> {
	
	
	@Resource
	private JedisUtil jedisUtil;
	private final String CACHE_PREFIX = "imooc-cache:";  //前缀
	
	private byte[] getKey(K k) {
		if(k instanceof String) {
			return (CACHE_PREFIX+k).getBytes();		 //返回key
		}
		return SerializationUtils.serialize(k); //Serialization
	}

	
	/**
	 * Returns the cached value stored under the specified {@code key}.
	 * @param key
	 * @return
	 * @throws CacheException
	 */
	@Override
	public V get(K key) throws CacheException {
		// TODO Auto-generated method stub
		System.out.println("Get data from redis"); //In actual development, a local second-level cache can be added. When the local cache cannot be read, read from redis to prompt performance
		byte[] value = jedisUtil.get(getKey(key));
		if(value != null) {
			return (V) SerializationUtils.deserialize(value);
		}
		return null;
	}

	/**
	 * Add cache entry.
	 * @param key
	 * @param value
	 * @return
	 * @throws CacheException
	 */
	@Override
	public V put(K key, V value) throws CacheException {
		// TODO Auto-generated method stub
		byte[] k = getKey(key);
		byte[] v = SerializationUtils.serialize(value);
		jedisUtil.set (k, v);
		jedisUtil.expire(k, 600);
		return value;
	}

	/**
	 * Remove the cache entry corresponding to the specified key.
	 * @param key
	 * @return
	 * @throws CacheException
	 */
	@Override
	public V remove(K key) throws CacheException {
		// TODO Auto-generated method stub
		byte[] k = getKey(key);
		byte [] v = jedisUtil.get (k);
		jedisUtil.delete(k);
		if(v != null) {
			return (V) SerializationUtils.deserialize (v);
		}
		return null;
	}

	@Override
	public void clear() throws CacheException {
		// TODO Auto-generated method stub
		// will clear all data in redis
	}

	/**
	 * Returns the number of entries in the cache.
	 * @return
	 */
	@Override
	public int size() {
		// TODO Auto-generated method stub
		return 0;
	}

	/**
	 * Returns a view of all keys of entries contained in this cache.
	 * @return
	 */
	@Override
	public Set<K> keys() {
		// TODO Auto-generated method stub
		return null;
	}

	/**
	 * Returns a view of all values ​​contained in this cache
	 * @return
	 */
	@Override
	public Collection<V> values() {
		// TODO Auto-generated method stub
		return null;
	}
	
	


}

3. Spring's xml configuration

	<bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">  
	   <property name="realm" ref="bosRealm"/>
	   <property name="sessionManager" ref="sessionManager" />
	   <property name="cacheManager" ref="redisCacheManager" /> //Set the cache
	</bean>  
	<bean class="com.springshirodemo.cache.RedisCacheManager" id="redisCacheManager"></bean> //注入rediscahemanager