Redis学习

1 概述

    目前多数的NoSql数据库本质上都是键值对形式，Redis也不例外。作为缓存数据库的一种，和Memcached相比，有以下几种主要的优点：

(1)速度上，Redis要比Memcached快，这是基于一些Benchmarks的测试结果得出的，而且在内存使用上，Redis突破了物理内存限制，可以使用虚拟内存；

(2)数据类型比Memcached要多，Redis支持List、Set、SortedSet、HashMap等多种数据结构；

(3)持久化方面，Memcached没有相应的持久化机制，而Redis有RDB快照和AOF日志两种形式结合做持久化，很大限度上保证了数据的持久化和安全性，不像Memcached断电后全都没了。

    Redis不失为Memcached的一种良好的替代方案。

    MongoDB是一种适合做格式化文档的存储及查询的NoSql数据库，它可以可以用来做海量数据存储，毕竟是一种硬盘数据库，和Redis这种缓存数据库没什么可比性。网上那么多讨论的，这里就不说了，见参考文档1。

    Redis也可以在硬盘上存储数据以及跨节点复制数据，也可以用来做队列系统，据说GitHub就采用Redis作为其基础架构。

2 安装部署

    目前官方发布的最新稳定版是2.8.6，我们就以它为例进行下述的操作及说明。

2.1 Centos安装部署

    安装步骤如下：

(1)将redis-2.8.6.tar.gz安装包拷贝到我们的指定目录下；

(2)使用命令tar -zxvf redis-2.8.6.tar.gz将tar包解压缩，得到redis-2.8.6目录；

(3)进入redis-2.8.6目录，执行make命令进行编译；

(4)编译结束之后，配置redis.conf文件，将“daemonize”属性设置为“yes”，表示我们会以后台进程形式启动Redis服务；将“port”属性设置为指定的端口，这里默认为“6379”；将“logfile”属性设置为指定的日志路径，其余的属性可以保持默认。

(5)使用命令src/redis-server ./redis.conf启动Redis服务，启动之后，可以在刚才配置的日志路径中看到如下类似信息：

 

这个帅气的图标就是Redis的LOGO了。

(6)执行客户端命令，验证服务是否正常：

 

(7)Redis服务停止命令，src/redis-cli shutdown

2.2 conf配置文件说明

    刚才在部署的时候，提到了redis.conf这个文件，这是整个Redis的最重要的配置文件，对于其中的一些参数，做如下说明：

属性	说明
daemonize	如果值是“yes”，则启动服务的时候是后台守护进程形式，如果值是“no”，则相反
pidfile	指定存储Redis进程号的文件路径
port	指定当前Redis服务的端口，默认为6379
tcp-backlog	此参数确定了TCP连接中已完成队列(完成三次握手之后)的长度， 当然此值必须不大于Linux系统定义的/proc/sys/net/core/somaxconn值，默认是511，而Linux的默认参数值是128。当系统并发量大并且客户端速度缓慢的时候，可以将这二个参数一起参考设定。
timeout	客户端和Redis服务端的连接超时时间，默认是0，表示永不超时。
tcp-keepalive	如果值非0，单位是秒，表示将周期性的使用SO_KEEPALIVE检测客户端是否还处于健康状态，避免服务器一直阻塞，官方给出的建议值是60S。
loglevel	Redis总共支持四个级别：debug、verbose、notice、warning。 Debug：记录很多信息，用于开发和测试； Varbose：有用的信息，不像debug会记录那么多； Notice：普通的verbose，常用于生产环境； Warning：只有非常重要或者严重的信息会记录到日志； 默认是notice级别。
logfile	日志的存储路径
databases	可用的数据库数，默认值为16，默认数据库为0，数据库范围在0-（database-1）之间，个人觉得DB的概念类似于命名空间
save	保存数据库快照信息到磁盘，其对应的值有两个，比如save 300 10表示：300秒内至少有300个key被改变时，触发保存信息到磁盘的事件。
stop-writes-on-bgsave-error	当持久化出现错误之后，是否继续提供写服务
rdbcompression	持久化到RDB文件时，是否压缩，“yes”为压缩，“no”则反之
rdbchecksum	读取和写入的时候是否支持CRC64校验，默认是开启的
dbfilename	镜像文件的名字
dir	当前工作目录，配置文件和镜像文件等都在此目录下
masterauth	设置访问master服务器的密码
slave-serve-stale-data	当slave服务器和master服务器失去连接后，或者当数据正在复制传输的时候，如果此参数值设置“yes”，slave服务器可以继续接受客户端的请求，否则，会返回给请求的客户端如下信息“SYNC with master in progress”
slave-read-only	是否允许slave服务器节点只提供读服务
repl-disable-tcp-nodelay	指定向slave同步数据时，是否禁用socket的NO_DELAY选项。若配置为“yes”，则禁用NO_DELAY，则TCP协议栈会合并小包统一发送，这样可以减少主从节点间的包数量并节省带宽，但会增加数据同步到slave的时间。若配置为“no”，表明启用NO_DELAY，则TCP协议栈不会延迟小包的发送时机，这样数据同步的延时会减少，但需要更大的带宽。通常情况下，应该配置为no以降低同步延时，但在主从节点间网络负载已经很高的情况下，可以配置为yes。
slave-priority	指定slave的优先级。在不只1个slave存在的部署环境下，当master宕机时，Redis Sentinel会将priority值最小的slave提升为master。需要注意的是，若该配置项为0，则对应的slave永远不会自动提升为master。
appendonly	开启append only 模式之后，redis 会把所接收到的每一次写操作请求都追加到appendonly.aof 文件中，当redis 重新启动时，会从该文件恢复出之前的状态。但是这样会造成appendonly.aof 文件过大，所以redis 还支持了BGREWRITEAOF 指令，对appendonly.aof 进行重新整理。默认是不开启的。
appendfilename	默认为appendonly.aof。
appendfsync	设置aof的同步频率，有三种选择always、everysec、no，默认是everysec表示每秒同步一次。
no-appendfsync-on-rewrite	指定是否在后台aof文件rewrite期间调用fsync，默认为no，表示要调用fsync（无论后台是否有子进程在刷盘）。Redis在后台写RDB文件或重写afo文件期间会存在大量磁盘IO，此时，在某些linux系统中，调用fsync可能会阻塞。
auto-aof-rewrite-percentage	指定Redis重写aof文件的条件，默认为100，表示与上次rewrite的aof文件大小相比，当前aof文件增长量超过上次afo文件大小的100%时，就会触发background rewrite。若配置为0，则会禁用自动rewrite
auto-aof-rewrite-min-size	指定触发rewrite的aof文件大小。若aof文件小于该值，即使当前文件的增量比例达到auto-aof-rewrite-percentage的配置值，也不会触发自动rewrite。即这两个配置项同时满足时，才会触发rewrite。
lua-time-limit	一个Lua脚本最长的执行时间，单位为毫秒，如果为0或负数表示无限执行时间，默认为5000
notify-keyspace-events	见参考3，按键通知事件
aof-rewrite-incremental-fsync	aof rewrite过程中,是否采取增量文件同步策略,默认为“yes”。 rewrite过程中,每32M数据进行一次文件同步,这样可以减少aof大文件写入对磁盘的操作次数

 

3 基本原理

    Redis是C编写的，对外开放的List、Set、SortedSet等数据结构都有着自己独到的实现和算法，其内部的实现原理见参考4，这里就不卖弄了，我也在学习。

    需求推动技术的进步，Redis可以应用在如下几种场景中：

(1)取最新N个数据操作

(2)排行榜操作，Top N

(3)需要精准设定过期时间的应用

(4)计数器应用

(5)获取某段时间内所有数据的排重值，uniq操作

(6)实时系统

(7)发布/订阅系统

(8)队列系统

(9)缓存

    具体的场景分析见参考9。

4 客户端操作

    使用src/redis-cli可以打开客户端对话框，输入命令即可。目前Redis支持String、Map、List、Set、SortedSets等五种数据结构以及支持订阅、事务等操作。每种命令的操作及详细解释见参考8。

5 Java操作Redis

    目前Jedis是官方推荐的比较好的Redis操作API包，我们这里结合Spring来看下如何使用Redis这一神器。 

    首先在pom文件中引入jredis包：

1 <dependency>
2    <groupId>redis.clients</groupId>
3    <artifactId>jedis</artifactId>
4    <version>2.1.0</version>
5 </dependency>

　　其次，在Spring的resource目录中增加Redis的配置文件/src/main/resources/redis.properties

 1 # Redis settings
 2 redis.host=192.168.1.106
 3 redis.port=6379
 4 redis.pass=
 5 redis.timeout=0
 6 
 7 redis.maxIdle=300
 8 redis.maxActive=600
 9 redis.maxWait=1000
10 redis.testOnBorrow=true

　　接着，在Spring的配置文件中配置好Redis的相关Bean注入：

 1 <?xml version="1.0" encoding="UTF-8"?>  
 2 <beans xmlns="http://www.springframework.org/schema/beans"  
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"  
 4     xmlns:context="http://www.springframework.org/schema/context"  
 5     xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"  
 6     xmlns:aop="http://www.springframework.org/schema/aop"  
 7     xsi:schemaLocation="  
 8             http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd  
 9             http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">  
10 
11     <context:property-placeholder location="classpath:redis.properties" />  
12     <context:component-scan base-package="com.scott.demo" />
13     
14     <bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor" />
15     
16     <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
17         <property name="maxActive" value="50" />
18         <property name="maxIdle" value="8" />
19         <property name="maxWait" value="1000" />
20         <property name="testOnBorrow" value="true"/>
21         <property name="testOnReturn" value="true"/>
22         <!-- <property name="testWhileIdle" value="true"/> -->
23     </bean>
24 
25     <bean id="shardedJedisPool" class="redis.clients.jedis.ShardedJedisPool"  scope="singleton">
26         <constructor-arg index="0" ref="jedisPoolConfig" />
27         <constructor-arg index="1">
28             <list>
29                 <bean class="redis.clients.jedis.JedisShardInfo">
30                     <constructor-arg name="host" value="${redis.host}" />
31                     <constructor-arg name="port" value="${redis.port}" />
32                     <constructor-arg name="timeout" value="${redis.timeout}" />
33                     <constructor-arg name="weight" value="1" />
34                 </bean>
35             </list>
36         </constructor-arg>
37     </bean>
38 </beans>

　　配置文件准备就绪，下面是获取Redis客户端对象的类：

 1 package com.scott.demo.redis.service.impl;
 2 
 3 import org.slf4j.Logger;
 4 import org.slf4j.LoggerFactory;
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.stereotype.Repository;
 7 
 8 import com.scott.demo.redis.service.RedisService;
 9 
10 import redis.clients.jedis.ShardedJedis;
11 import redis.clients.jedis.ShardedJedisPool;
12 
13 /**
14  * @author Scott
15  * @date 2014年2月23日
16  * @description
17  */
18 @Repository("redisService")
19 public class RedisServiceImpl implements RedisService {
20 
21     private static final Logger log = LoggerFactory.getLogger(RedisServiceImpl.class);
22 
23     @Autowired
24     private ShardedJedisPool shardedJedisPool;
25 
26     public ShardedJedis getRedisClient() {
27         try {
28             ShardedJedis shardJedis = shardedJedisPool.getResource();
29             return shardJedis;
30         } catch (Exception e) {
31             log.error("getRedisClent error", e);
32         }
33         return null;
34     }
35 
36     public void returnResource(ShardedJedis shardedJedis) {
37         shardedJedisPool.returnResource(shardedJedis);
38     }
39 
40     public void returnResource(ShardedJedis shardedJedis, boolean broken) {
41         if (broken) {
42             shardedJedisPool.returnBrokenResource(shardedJedis);
43         } else {
44             shardedJedisPool.returnResource(shardedJedis);
45         }
46     }
47 
48 }

　　根据上述类，可以在下面的RedisClient类中实现Redis的相关操作：

package com.scott.demo.redis;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import com.scott.demo.redis.service.impl.RedisServiceImpl;

import redis.clients.jedis.BinaryClient.LIST_POSITION;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisShardInfo;
import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.ShardedJedisPipeline;
import redis.clients.jedis.SortingParams;
import redis.clients.jedis.Tuple;

/**
 * @author Scott
 * @date 2014年2月23日
 * @description
 */
public class RedisClient {

	private static final Logger log = LoggerFactory.getLogger(RedisClient.class);

	@Autowired
	private RedisServiceImpl redisService;

	public void disconnect() {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		shardedJedis.disconnect();
	}

	/**
	 * 设置单个值
	 */
	public String set(String key, String value) {
		String result = null;

		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.set(key, value);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	/**
	 * 获取单个值
	 */
	public String get(String key) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}

		boolean flag = false;
		try {
			result = shardedJedis.get(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Boolean exists(String key) {
		Boolean result = false;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.exists(key);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String type(String key) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.type(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	/**
	 * 在某段时间后失效
	 */
	public Long expire(String key, int seconds) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.expire(key, seconds);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	/**
	 * 在某个时间点失效
	 */
	public Long expireAt(String key, long time) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.expireAt(key, time);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long ttl(String key) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.ttl(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public boolean setbit(String key, long offset, boolean value) {

		ShardedJedis shardedJedis = redisService.getRedisClient();
		boolean result = false;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.setbit(key, offset, value);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public boolean getbit(String key, long offset) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		boolean result = false;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;

		try {
			result = shardedJedis.getbit(key, offset);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public long setrange(String key, long offset, String value) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		long result = 0;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.setrange(key, offset, value);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String getrange(String key, long startOffset, long endOffset) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		String result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.getrange(key, startOffset, endOffset);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String getSet(String key, String value) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.getSet(key, value);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long setnx(String key, String value) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.setnx(key, value);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String setex(String key, int seconds, String value) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.setex(key, seconds, value);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long decrBy(String key, long integer) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.decrBy(key, integer);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long decr(String key) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.decr(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long incrBy(String key, long integer) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.incrBy(key, integer);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long incr(String key) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.incr(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long append(String key, String value) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.append(key, value);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String substr(String key, int start, int end) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.substr(key, start, end);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long hset(String key, String field, String value) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hset(key, field, value);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String hget(String key, String field) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hget(key, field);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long hsetnx(String key, String field, String value) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hsetnx(key, field, value);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String hmset(String key, Map<String, String> hash) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hmset(key, hash);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public List<String> hmget(String key, String... fields) {
		List<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hmget(key, fields);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long hincrBy(String key, String field, long value) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hincrBy(key, field, value);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Boolean hexists(String key, String field) {
		Boolean result = false;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hexists(key, field);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long del(String key) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.del(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long hdel(String key, String field) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hdel(key, field);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long hlen(String key) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hlen(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<String> hkeys(String key) {
		Set<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hkeys(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public List<String> hvals(String key) {
		List<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hvals(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Map<String, String> hgetAll(String key) {
		Map<String, String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.hgetAll(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	/**
	 * 在redis list尾部增加一个String
	 * */
	public Long rpush(String key, String string) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.rpush(key, string);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	/**
	 * 在redis list头部增加一个String
	 * */
	public Long lpush(String key, String string) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.lpush(key, string);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long llen(String key) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.llen(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public List<String> lrange(String key, long start, long end) {
		List<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.lrange(key, start, end);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String ltrim(String key, long start, long end) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.ltrim(key, start, end);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String lIndex(String key, long index) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.lindex(key, index);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String lset(String key, long index, String value) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.lset(key, index, value);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long lrem(String key, long count, String value) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.lrem(key, count, value);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	/**
	 * 从redis list头部取出一个key
	 * */
	public String lpop(String key) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.lpop(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	/**
	 * 从redis list尾部取出一个key
	 * */
	public String rpop(String key) {
		String result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.rpop(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long sadd(String key, String member) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.sadd(key, member);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<String> smembers(String key) {
		Set<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.smembers(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long srem(String key, String member) {
		ShardedJedis shardedJedis = redisService.getRedisClient();

		Long result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.srem(key, member);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String spop(String key) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		String result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.spop(key);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long scard(String key) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		Long result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.scard(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Boolean sismember(String key, String member) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		Boolean result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.sismember(key, member);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String srandmember(String key) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		String result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.srandmember(key);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long zadd(String key, double score, String member) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.zadd(key, score, member);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<String> zrange(String key, int start, int end) {
		Set<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.zrange(key, start, end);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long zrem(String key, String member) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.zrem(key, member);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Double zincrby(String key, double score, String member) {
		Double result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zincrby(key, score, member);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long zrank(String key, String member) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrank(key, member);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long zrevrank(String key, String member) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrevrank(key, member);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<String> zrevrange(String key, int start, int end) {
		Set<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrevrange(key, start, end);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<Tuple> zrangeWithScores(String key, int start, int end) {
		Set<Tuple> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrangeWithScores(key, start, end);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<Tuple> zrevrangeWithScores(String key, int start, int end) {
		Set<Tuple> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrevrangeWithScores(key, start, end);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long zcard(String key) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zcard(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Double zscore(String key, String member) {
		Double result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zscore(key, member);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public List<String> sort(String key) {
		List<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.sort(key);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public List<String> sort(String key, SortingParams sortingParameters) {
		List<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.sort(key, sortingParameters);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long zcount(String key, double min, double max) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zcount(key, min, max);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<String> zrangeByScore(String key, double min, double max) {
		Set<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrangeByScore(key, min, max);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<String> zrevrangeByScore(String key, double max, double min) {
		Set<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrevrangeByScore(key, max, min);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<String> zrangeByScore(String key, double min, double max,
			int offset, int count) {
		Set<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrangeByScore(key, min, max, offset, count);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<String> zrevrangeByScore(String key, double max, double min,
			int offset, int count) {
		Set<String> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis
					.zrevrangeByScore(key, max, min, offset, count);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<Tuple> zrangeByScoreWithScores(String key, double min, double max) {
		Set<Tuple> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrangeByScoreWithScores(key, min, max);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<Tuple> zrevrangeByScoreWithScores(String key, double max,
			double min) {
		Set<Tuple> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrevrangeByScoreWithScores(key, max, min);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<Tuple> zrangeByScoreWithScores(String key, double min,
			double max, int offset, int count) {
		Set<Tuple> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrangeByScoreWithScores(key, min, max,
					offset, count);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Set<Tuple> zrevrangeByScoreWithScores(String key, double max,
			double min, int offset, int count) {
		Set<Tuple> result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zrevrangeByScoreWithScores(key, max, min,
					offset, count);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long zremrangeByRank(String key, int start, int end) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zremrangeByRank(key, start, end);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long zremrangeByScore(String key, double start, double end) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.zremrangeByScore(key, start, end);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Long linsert(String key, LIST_POSITION where, String pivot,
			String value) {
		Long result = null;
		ShardedJedis shardedJedis = redisService.getRedisClient();
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {

			result = shardedJedis.linsert(key, where, pivot, value);

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	
	@SuppressWarnings("deprecation")
	public List<Object> pipelined(ShardedJedisPipeline shardedJedisPipeline) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		List<Object> result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.pipelined(shardedJedisPipeline);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Jedis getShard(String key) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		Jedis result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.getShard(key);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public JedisShardInfo getShardInfo(String key) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		JedisShardInfo result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.getShardInfo(key);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public String getKeyTag(String key) {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		String result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.getKeyTag(key);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Collection<JedisShardInfo> getAllShardInfo() {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		Collection<JedisShardInfo> result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.getAllShardInfo();

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

	public Collection<Jedis> getAllShards() {
		ShardedJedis shardedJedis = redisService.getRedisClient();
		Collection<Jedis> result = null;
		if (shardedJedis == null) {
			return result;
		}
		boolean flag = false;
		try {
			result = shardedJedis.getAllShards();

		} catch (Exception e) {
			log.error(e.getMessage(), e);
			flag = true;
		} finally {
			redisService.returnResource(shardedJedis, flag);
		}
		return result;
	}

}

　　使用的时候，直接调用此类中对应的方法即可。

　　Redis的内部实现是C写的，有必要好好看看里面究竟是怎么实现的。

6 参考

(1)Redis和MongoDB比较：

http://taotao1240.blog.51cto.com/731446/755173

(2)Redis官方下载地址：

http://redis.cn/download.html

(3) 按键通知事件

http://redis.mjplay.com.cn/topic/notification.html

(4)Redis内部实现

http://www.redisbook.com/en/latest/

(5)Redis持久化

http://blog.nosqlfan.com/html/3813.html

(6)Redis的AOF详细解读

http://www.wzxue.com/redis%E6%A0%B8%E5%BF%83%E8%A7%A3%E8%AF%BB-aof%E4%B8%8Erewrite%E6%9C%BA%E5%88%B6/

(7)Redis失效机制解析

http://blog.nosqlfan.com/html/4218.html

(8)Redis命令列表

http://redis.cn/commands.html

(9)Redis应用场景

http://www.coderli.com/redis-application-scenarios

(10)Jedis下载地址：

https://github.com/xetorthio/jedis