Spring整合redis，通过sentinel进行主从切换。(何志雄)

实现功能描述：

        redis服务器进行Master-slaver-slaver-....主从配置，通过2台sentinel进行failOver故障转移，自动切换，采用该代码完全可以直接用于实际生产环境。

       

       题外话：

         一般来说这样的部署足以支持数以百万级的用户，但如果数量实在是太高，此时redis的Master-Slaver主从不一定能够满足，因此进行redis的分片。

        本文不讲解redis的分片，但如果你使用了，需要注意的按照另一篇文章的介绍：Sentinel&Jedis看上去是个完美的解决方案，这句话只说对了一半，

         在无分片的情况是这样，但我们的应用使用了数据分片-sharing，数据被平均分布到4个不同的实例上，每个实例以主从结构部署，Jedis没有提供

         基于Sentinel的ShardedJedisPool，也就是说在4个分片中，如果其中一个分片发生主从切换，应用所使用的ShardedJedisPool无法获得通知，所有

         对那个分片的操作将会失败。文章中提出了解决方案,请参考《基于Redis Sentinel的Redis集群(主从&Sharding)高可用方案》

        

 

 

        该代码模拟多线程向redis中set/get。

 

1、maven依赖配置

<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>1.4.1.RELEASE</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.6.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.3.2</version>
</dependency>

 

2、redis.properties

# Redis settings
#sentinel1的IP和端口
im.hs.server.redis.sentinel1.host=192.168.62.154
im.hs.server.redis.sentinel1.port=26379
#sentinel2的IP和端口
im.hs.server.redis.sentinel2.host=192.168.62.153
im.hs.server.redis.sentinel2.port=26379
#sentinel的鉴权密码
im.hs.server.redis.sentinel.masterName=155Master
im.hs.server.redis.sentinel.password=hezhixiong
#最大闲置连接数
im.hs.server.redis.maxIdle=500
#最大连接数，超过此连接时操作redis会报错
im.hs.server.redis.maxTotal=5000
im.hs.server.redis.maxWaitTime=1000
im.hs.server.redis.testOnBorrow=true
#最小闲置连接数，spring启动的时候自动建立该数目的连接供应用程序使用，不够的时候会申请。
im.hs.server.redis.minIdle=300

3、spring-redis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

<!-- Spring自动将该包目录下标记为@Service的所有类作为spring的Bean -->
<context:component-scan base-package="com.gaojiasoft.test.redis" />

<context:property-placeholder location="classpath:conf/redis/redis.properties" />

<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxTotal" value="${im.hs.server.redis.maxTotal}" />
<property name="minIdle" value="${im.hs.server.redis.minIdle}" />
<property name="maxWaitMillis" value="${im.hs.server.redis.maxWaitTime}" />
<property name="maxIdle" value="${im.hs.server.redis.maxIdle}" />
<property name="testOnBorrow" value="${im.hs.server.redis.testOnBorrow}" />
<property name="testOnReturn" value="true" />
<property name="testWhileIdle" value="true" />
</bean>

<bean id="sentinelConfiguration"
class="org.springframework.data.redis.connection.RedisSentinelConfiguration">
<property name="master">
<bean class="org.springframework.data.redis.connection.RedisNode">
<property name="name" value="${im.hs.server.redis.sentinel.masterName}"></property>
</bean>
</property>
<property name="sentinels">
<set>
<bean class="org.springframework.data.redis.connection.RedisNode">
<constructor-arg name="host"
value="${im.hs.server.redis.sentinel1.host}"></constructor-arg>
<constructor-arg name="port"
value="${im.hs.server.redis.sentinel1.port}"></constructor-arg>
</bean>
<bean class="org.springframework.data.redis.connection.RedisNode">
<constructor-arg name="host"
value="${im.hs.server.redis.sentinel2.host}"></constructor-arg>
<constructor-arg name="port"
value="${im.hs.server.redis.sentinel2.port}"></constructor-arg>
</bean>
</set>
</property>
</bean>

<bean id="connectionFactory"
class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" p:password="${im.hs.server.redis.sentinel.password}">
<constructor-arg name="sentinelConfig" ref="sentinelConfiguration"></constructor-arg>
<constructor-arg name="poolConfig" ref="poolConfig"></constructor-arg>
</bean>

<bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
<property name="connectionFactory" ref="connectionFactory" />
</bean>
</beans><strong>
</strong>

 

4、RedisServiceImpl.java

package com.gaojiasoft.test.redis;

import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.apache.commons.lang3.concurrent.BasicThreadFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

@Service("redisService")
public class RedisServiceImpl {

private Logger logger = LoggerFactory.getLogger("RedisServiceImpl");

@Autowired
RedisTemplate<?, ?> redisTemplate;

// 线程池
private static final ThreadPoolExecutor executor = new ThreadPoolExecutor(
256, 256, 30L, TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable>(),
new BasicThreadFactory.Builder().daemon(true)
.namingPattern("redis-oper-%d").build(),
new ThreadPoolExecutor.CallerRunsPolicy());

public void set(final String key, final String value) {
redisTemplate.execute(new RedisCallback<Object>() {
@Override
public Object doInRedis(RedisConnection connection)
throws DataAccessException {
connection.set(
redisTemplate.getStringSerializer().serialize(key),
redisTemplate.getStringSerializer().serialize(value));
logger.debug("save key:" + key + ",value:" + value);
return null;
}
});
}

public String get(final String key) {
return redisTemplate.execute(new RedisCallback<String>() {
@Override
public String doInRedis(RedisConnection connection)
throws DataAccessException {
byte[] byteKye = redisTemplate.getStringSerializer().serialize(
key);
if (connection.exists(byteKye)) {
byte[] byteValue = connection.get(byteKye);
String value = redisTemplate.getStringSerializer()
.deserialize(byteValue);
logger.debug("get key:" + key + ",value:" + value);
return value;
}
logger.error("valus does not exist!,key:"+key);
return null;
}
});
}

public void delete(final String key) {
redisTemplate.execute(new RedisCallback<Object>() {
public Object doInRedis(RedisConnection connection) {
connection.del(redisTemplate.getStringSerializer().serialize(
key));
return null;
}
});
}

/**
* 线程池并发操作redis
*
* @param keyvalue
*/
public void mulitThreadSaveAndFind(final String keyvalue) {
executor.execute(new Runnable() {
@Override
public void run() {
try {
set(keyvalue, keyvalue);
get(keyvalue);
} catch (Throwable th) {
// 防御性容错，避免高并发下的一些问题
logger.error("", th);
}
}
});
}
}

5、RedisTest.java   (Junit测试用例)

package com.gaojiasoft.test.redis;

import org.junit.Test;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class RedisTest {

private static ConfigurableApplicationContext context;

RedisServiceImpl service;

@Test
public void testSave() throws InterruptedException {
context = new ClassPathXmlApplicationContext(
"classpath:conf/redis/spring-redis.xml");
service = (RedisServiceImpl) context.getBean("redisService");

int i = 1;
while (true) {
Thread.sleep(1);
try {
service.mulitThreadSaveAndFind("" + i);
} catch (Exception e) {
e.printStackTrace();
}
i++;
}
}
}