Mybatis自定义缓存——Redis实现

最近项目需用Redis来实现Mybatis缓存方案。

mybatis默认缓存是PerpetualCache，可以查看一下它的源码，发现其是Cache接口的实现；那么我们的缓存只要实现该接口即可。

该接口有以下方法需要实现：

  String getId();
  int getSize();
  void putObject(Object key, Object value);
  Object getObject(Object key);
  Object removeObject(Object key);
  void clear();
  ReadWriteLock getReadWriteLock();

实现类：

import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.apache.ibatis.cache.Cache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;


public class MybatisRedisCache implements Cache {
	
	private static Logger logger = LoggerFactory.getLogger(MybatisRedisCache.class);
	private Jedis redisClient=createReids();
	 /** The ReadWriteLock. */  
    private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock(); 
    
	private String id;
	
	public MybatisRedisCache(final String id) {  
		if (id == null) {
            throw new IllegalArgumentException("Cache instances require an ID");
        }
		logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>MybatisRedisCache:id="+id);
        this.id = id;
    }  
	@Override
	public String getId() {
		return this.id;
	}

	@Override
	public int getSize() {
   
		return Integer.valueOf(redisClient.dbSize().toString());
	}

	@Override
	public void putObject(Object key, Object value) {
		logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>putObject:"+key+"="+value);
		redisClient.set(SerializeUtil.serialize(key.toString()), SerializeUtil.serialize(value));
	}

	@Override
	public Object getObject(Object key) {
		Object value = SerializeUtil.unserialize(redisClient.get(SerializeUtil.serialize(key.toString())));
		logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>getObject:"+key+"="+value);
		return value;
	}

	@Override
	public Object removeObject(Object key) {
		return redisClient.expire(SerializeUtil.serialize(key.toString()),0);
	}

	@Override
	public void clear() {
		  redisClient.flushDB();
	}
	@Override
	public ReadWriteLock getReadWriteLock() {
		return readWriteLock;
	}
    protected  static Jedis createReids(){
    	JedisPool pool = new JedisPool(new JedisPoolConfig(), "10.12.162.85");
    	return pool.getResource();
    }

public class SerializeUtil {
	public static byte[] serialize(Object object) {
		ObjectOutputStream oos = null;
		ByteArrayOutputStream baos = null;
		try {
		//序列化
		baos = new ByteArrayOutputStream();
		oos = new ObjectOutputStream(baos);
		oos.writeObject(object);
		byte[] bytes = baos.toByteArray();
		return bytes;
		} catch (Exception e) {
		 e.printStackTrace();
		}
		return null;
		}
		 
		public static Object unserialize(byte[] bytes) {
		ByteArrayInputStream bais = null;
		try {
		//反序列化
		bais = new ByteArrayInputStream(bytes);
		ObjectInputStream ois = new ObjectInputStream(bais);
		return ois.readObject();
		} catch (Exception e) {
		 
		}
		return null;
		}

配置Mybatis  SessionFactory：

	
		
		
			
				true 
				
				true
				 
				 false
				   
				 true
				   
				 true
                  
                true
                  
                FULL
                  
                BATCH
                  
                25000
                
			
		
	

最后在需要缓存的DAO类上添加@CacheNamespace(implementation=MybatisRedisCache.class )

这样就完成了Mybatis自定义缓存的实现。

参考文件：1、http://denger.iteye.com/blog/1126423

                     2、MyBatis 3 User Guide