spring-data-redis 中的HashOperations为啥有三个参数

Posted 2023-04-01

1，context:property-placeholder 标签用来导入properties文件。从而替换$redis.maxIdle这样的变量。
2，context:component-scan 是为了在com.x.redis.dao报下的类能够实用spring的注解注入的方式。
3，事实上我们只需要把JedisPoolConfig配数来就好了，接下来就是spring的封装了。所以直接看UserDAOImpl的实现就明白了。 参考技术A 哎呀！分数挺多的，我给你个程序，分数哥要拿啊！

spring-data-redis读写分离

   在对Redis进行性能优化时，一直想对Redis进行读写分离。但由于项目底层采用spring-data-redis对redis进行操作，参考spring官网却发现spring-data-redis目前(1.7.0.RELEASE)及以前的版本并不支持读写分离。

 一、源码分析

  spring-data-redis中关于JedisConnectionFactory的配置如下：

<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd">
        
    <bean id="redisSentinelConfiguration" class="org.springframework.data.redis.connection.RedisSentinelConfiguration">
        <property name="master">
            <bean class="org.springframework.data.redis.connection.RedisNode">
                <property name="name" value="mymaster"/>
                <constructor-arg name="host" value="${redis.master.host}"></constructor-arg>
                <constructor-arg name="port" value="${redis.master.port}"></constructor-arg>
            </bean>
        </property>
        <property name="sentinels">
            <set>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="${redis.sentinel1.host}"></constructor-arg>
                    <constructor-arg name="port" value="${redis.sentinel1.port}"></constructor-arg>
                </bean>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="${redis.sentinel2.host}"></constructor-arg>
                    <constructor-arg name="port" value="${redis.sentinel2.port}"></constructor-arg>
                </bean>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="${redis.sentinel3.host}"></constructor-arg>
                    <constructor-arg name="port" value="${redis.sentinel3.port}"></constructor-arg>
                </bean>
            </set>
        </property>
    </bean>
    
    <!-- 连接池配置 -->
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxTotal" value="${redis.pool.maxActive}" />
        <property name="maxIdle" value="${redis.pool.maxIdle}" />
        <!-- <property name="maxWait" value="${redis.pool.maxWait}" /> -->
        <property name="testOnBorrow" value="${redis.pool.testOnBorrow}" />
        <property name="testOnReturn" value="${redis.pool.testOnReturn}" />
    </bean>
    
    <bean id="jedisConnectionFactory"
          class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="poolConfig" ref="jedisPoolConfig"></property>  
        <constructor-arg ref="redisSentinelConfiguration"/>
    </bean>

    <bean id="stringRedisTemplate" 
          class="org.springframework.data.redis.core.StringRedisTemplate" 
          p:connection-factory-ref="jedisConnectionFactory"/>
</beans>

  查看JedisConnectionFactory源码发现pool是Pool<Jedis>，而不是Pool<ShardedJedis>。因此我猜目前spring data redis是做不了读写分离的，stringRedisTemplate读写操作都是在master上。

二、读写分离改造

  参考sentinel的主备选举机制对spring-data-redis的相关配置进行如下改造：

 (1)Spring配置

<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd">
        
       <context:property-placeholder  location="classpath:redis/redis.properties" ignore-unresolvable="true" />
       
       <bean id="poolConfig" class="redis.client.jedis.JedisPoolConfig">
            <property name="maxIdle" value="${redis.maxIdle}" />
            <property name="maxTotal" value="${redis.maxTotal}" />
            <property name="maxWaitMillis" value="${redis.maxWait}" />
            <property name="testOnBuorrow" value="${redis.testOnBorrow}" />
        </bean>

    <bean id="redisSentinelConfiguration" class="org.springframework.data.redis.connection.RedisSentinelConfiguration">
     <constructor-arg index="0">
          <bean class="org.springframework.core.env.MapPropertySource">
            <constructor-arg index="0" value="RedisSentinelConffiguration" />
            <constructor-arg index="1">
               <map>
                <entry key="spring.redis.sentinel.master" value="${redis.sentinel.master}"></entry>
                <entry key="spring.redis.sentinel.nodes" value="${redis.sentinel.nodes"}> </entry>
                </map>
             </constructor-arg>
             </bean>
            </constructor-arg>
    </bean>
    
    <bean id="connectionFactory" class="com.test.data.redis.connection.TWJedisConnectionFactory">
       <constructor-arg index="0" ref="redisSentinelConfiguration" />
           <constructor-arg index="1" ref="poolConfig" />
           <property name="password" value="${redis.pass}" />
           <property name="databse" value="7" />
    </bean>

    <bean id="redisTemplate" class="com.test.data.redis.core.TWRedisTemplate" 
          <property name="connectionFactory" ref="connectionFactory"/>
        </bean>
</beans>