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Redis主从实现读写分离

转载 作者：qq735679552 更新时间：2022-09-29 22:32:09 27 4
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前言 。

大家在工作中可能会遇到这样的需求，即Redis读写分离，目的是为了压力分散化。下面我将为大家介绍借助AWS的ELB实现读写分离，以写主读从为例.

实现 。

引用库文件 。

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<!-- redis客户端 -->
<dependency>
  <groupId>redis.clients</groupId>
  <artifactId>jedis</artifactId>
  <version> 2.6 . 2 </version>
</dependency>

方式一，借助切面 。

JedisPoolSelector 。

此类的目的是为读和写分别配置不同的注解，用来区分是主还是从.

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package com.silence.spring.redis.readwriteseparation;
 
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
 
/**
  * Created by keysilence on 16/10/26.
  */
@Retention (RetentionPolicy.RUNTIME)
@Target (ElementType.METHOD)
public @interface JedisPoolSelector {
 
   String value();
 
}

JedisPoolAspect 。

此类的目的是针对主和从的注解，进行动态链接池调配，即主的使用主链接池，从的使用从连接池.

  。

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package com.silence.spring.redis.readwriteseparation;
 
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import redis.clients.jedis.JedisPool;
 
import javax.annotation.PostConstruct;
import java.lang.reflect.Method;
import java.util.Date;
 
/**
  * Created by keysilence on 16/10/26.
  */
@Aspect
public class JedisPoolAspect implements ApplicationContextAware {
 
   private ApplicationContext ctx;
 
   @PostConstruct
   public void init() {
     System.out.println( "jedis pool aspectj started @" + new Date());
   }
 
   @Pointcut ( "execution(* com.silence.spring.redis.readwriteseparation.util.*.*(..))" )
   private void allMethod() {
 
   }
 
   @Before ( "allMethod()" )
   public void before(JoinPoint point)
   {
     Object target = point.getTarget();
     String method = point.getSignature().getName();
 
     Class classz = target.getClass();
 
     Class<?>[] parameterTypes = ((MethodSignature) point.getSignature())
         .getMethod().getParameterTypes();
     try {
       Method m = classz.getMethod(method, parameterTypes);
       if (m != null && m.isAnnotationPresent(JedisPoolSelector. class )) {
         JedisPoolSelector data = m
             .getAnnotation(JedisPoolSelector. class );
         JedisPool jedisPool = (JedisPool) ctx.getBean(data.value());
         DynamicJedisPoolHolder.putJedisPool(jedisPool);
       }
 
     } catch (Exception e) {
       e.printStackTrace();
     }
   }
 
   public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
     this .ctx = applicationContext;
   }
 
}

DynamicJedisPoolHolder 。

此类目的是存储当前使用的JedisPool，即上面类赋值后的结果保存.

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package com.silence.spring.redis.readwriteseparation;
 
import redis.clients.jedis.JedisPool;
 
/**
  * Created by keysilence on 16/10/26.
  */
public class DynamicJedisPoolHolder {
 
   public static final ThreadLocal<JedisPool> holder = new ThreadLocal<JedisPool>();
 
   public static void putJedisPool(JedisPool jedisPool) {
     holder.set(jedisPool);
   }
 
   public static JedisPool getJedisPool() {
     return holder.get();
   }
 
}

RedisUtils 。

此类目的是对Redis具体的调用，里面包含使用主还是从的方式调用.

  。

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package com.silence.spring.redis.readwriteseparation.util;
 
import com.silence.spring.redis.readwriteseparation.DynamicJedisPoolHolder;
import com.silence.spring.redis.readwriteseparation.JedisPoolSelector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
/**
  * Created by keysilence on 16/10/26.
  */
public class RedisUtils {
   private static Logger logger = LoggerFactory.getLogger(RedisUtils. class );
 
   @JedisPoolSelector ( "master" )
   public String setString( final String key, final String value) {
 
     String ret = DynamicJedisPoolHolder.getJedisPool().getResource().set(key, value);
     System.out.println( "key:" + key + ",value:" + value + ",ret:" + ret);
 
     return ret;
   }
 
   @JedisPoolSelector ( "slave" )
   public String get( final String key) {
 
     String ret = DynamicJedisPoolHolder.getJedisPool().getResource().get(key);
     System.out.println( "key:" + key + ",ret:" + ret);
 
     return ret;
   }
 
}

spring-datasource.xml 。

  。

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<? 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: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/aop http://www.springframework.org/schema/aop/spring-aop.xsd" >
 
   < bean id = "poolConfig" class = "redis.clients.jedis.JedisPoolConfig" >
     <!-- 池中最大链接数 -->
     < property name = "maxTotal" value = "100" />
     <!-- 池中最大空闲链接数 -->
     < property name = "maxIdle" value = "50" />
     <!-- 池中最小空闲链接数 -->
     < property name = "minIdle" value = "20" />
     <!-- 当池中链接耗尽，调用者最大阻塞时间，超出此时间将跑出异常。（单位：毫秒；默认为-1，表示永不超时） -->
     < property name = "maxWaitMillis" value = "1000" />
     <!-- 参考：http://biasedbit.com/redis-jedispool-configuration/ -->
     <!-- 调用者获取链接时，是否检测当前链接有效性。无效则从链接池中移除，并尝试继续获取。（默认为false） -->
     < property name = "testOnBorrow" value = "true" />
     <!-- 向链接池中归还链接时，是否检测链接有效性。（默认为false） -->
     < property name = "testOnReturn" value = "true" />
     <!-- 调用者获取链接时，是否检测空闲超时。如果超时，则会被移除（默认为false） -->
     < property name = "testWhileIdle" value = "true" />
     <!-- 空闲链接检测线程一次运行检测多少条链接 -->
     < property name = "numTestsPerEvictionRun" value = "10" />
     <!-- 空闲链接检测线程检测周期。如果为负值，表示不运行检测线程。（单位：毫秒，默认为-1） -->
     < property name = "timeBetweenEvictionRunsMillis" value = "60000" />
     <!-- 链接获取方式。队列：false；栈：true -->
     <!--<property name="lifo" value="false" />-->
   </ bean >
 
   < bean id = "master" class = "redis.clients.jedis.JedisPool" >
     < constructor-arg index = "0" ref = "poolConfig" />
     < constructor-arg index = "1" value = "192.168.100.110" type = "java.lang.String" />
     < constructor-arg index = "2" value = "6379" type = "int" />
   </ bean >
 
   < bean id = "slave" class = "redis.clients.jedis.JedisPool" >
     < constructor-arg index = "0" ref = "poolConfig" />
     <!-- 此处Host配置成ELB地址 -->
     < constructor-arg index = "1" value = "192.168.100.110" type = "java.lang.String" />
     < constructor-arg index = "2" value = "6380" type = "int" />
   </ bean >
 
   < bean id = "redisUtils" class = "com.silence.spring.redis.readwriteseparation.util.RedisUtils" >
   </ bean >
 
   < bean id = "jedisPoolAspect" class = "com.silence.spring.redis.readwriteseparation.JedisPoolAspect" />
 
   < aop:aspectj-autoproxy proxy-target-class = "true" />
 
</ beans >

Test 。

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package com.silence.spring.redis.readwriteseparation;
 
import com.silence.spring.redis.readwriteseparation.util.RedisUtils;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
/**
  * Created by keysilence on 16/10/26.
  */
public class Test {
 
   public static void main(String[] args) {
 
     ApplicationContext ctx = new ClassPathXmlApplicationContext( "spring-datasource.xml" );
 
     System.out.println(ctx);
 
     RedisUtils redisUtils = (RedisUtils) ctx.getBean( "redisUtils" );
     redisUtils.setString( "aaa" , "111" );
 
     System.out.println(redisUtils.get( "aaa" ));
   }
 
}

方式二，依赖注入 。

与方式一类似，但是需要写死具体使用主的池还是从的池，思路如下： 放弃注解的方式，直接将主和从的两个链接池注入到具体实现类中.

RedisUtils 。

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package com.silence.spring.redis.readwriteseparation.util;
 
import com.silence.spring.redis.readwriteseparation.DynamicJedisPoolHolder;
import com.silence.spring.redis.readwriteseparation.JedisPoolSelector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.JedisPool;
 
/**
  * Created by keysilence on 16/10/26.
  */
public class RedisUtils {
   private static Logger logger = LoggerFactory.getLogger(RedisUtils. class );
 
   private JedisPool masterJedisPool;
 
   private JedisPool slaveJedisPool;
 
   public void setMasterJedisPool(JedisPool masterJedisPool) {
     this .masterJedisPool = masterJedisPool;
   }
 
   public void setSlaveJedisPool(JedisPool slaveJedisPool) {
     this .slaveJedisPool = slaveJedisPool;
   }
 
   public String setString( final String key, final String value) {
 
     String ret = masterJedisPool.getResource().set(key, value);
     System.out.println( "key:" + key + ",value:" + value + ",ret:" + ret);
 
     return ret;
   }
 
   public String get( final String key) {
 
     String ret = slaveJedisPool.getResource().get(key);
     System.out.println( "key:" + key + ",ret:" + ret);
 
     return ret;
   }
 
}

spring-datasource.xml 。

  。

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<? 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: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/aop http://www.springframework.org/schema/aop/spring-aop.xsd" >
 
   < bean id = "poolConfig" class = "redis.clients.jedis.JedisPoolConfig" >
     <!-- 池中最大链接数 -->
     < property name = "maxTotal" value = "100" />
     <!-- 池中最大空闲链接数 -->
     < property name = "maxIdle" value = "50" />
     <!-- 池中最小空闲链接数 -->
     < property name = "minIdle" value = "20" />
     <!-- 当池中链接耗尽，调用者最大阻塞时间，超出此时间将跑出异常。（单位：毫秒；默认为-1，表示永不超时） -->
     < property name = "maxWaitMillis" value = "1000" />
     <!-- 参考：http://biasedbit.com/redis-jedispool-configuration/ -->
     <!-- 调用者获取链接时，是否检测当前链接有效性。无效则从链接池中移除，并尝试继续获取。（默认为false） -->
     < property name = "testOnBorrow" value = "true" />
     <!-- 向链接池中归还链接时，是否检测链接有效性。（默认为false） -->
     < property name = "testOnReturn" value = "true" />
     <!-- 调用者获取链接时，是否检测空闲超时。如果超时，则会被移除（默认为false） -->
     < property name = "testWhileIdle" value = "true" />
     <!-- 空闲链接检测线程一次运行检测多少条链接 -->
     < property name = "numTestsPerEvictionRun" value = "10" />
     <!-- 空闲链接检测线程检测周期。如果为负值，表示不运行检测线程。（单位：毫秒，默认为-1） -->
     < property name = "timeBetweenEvictionRunsMillis" value = "60000" />
     <!-- 链接获取方式。队列：false；栈：true -->
     <!--<property name="lifo" value="false" />-->
   </ bean >
 
   < bean id = "masterJedisPool" class = "redis.clients.jedis.JedisPool" >
     < constructor-arg index = "0" ref = "poolConfig" />
     < constructor-arg index = "1" value = "192.168.100.110" type = "java.lang.String" />
     < constructor-arg index = "2" value = "6379" type = "int" />
   </ bean >
 
   < bean id = "slaveJedisPool" class = "redis.clients.jedis.JedisPool" >
     < constructor-arg index = "0" ref = "poolConfig" />
     < constructor-arg index = "1" value = "192.168.100.110" type = "java.lang.String" />
     < constructor-arg index = "2" value = "6380" type = "int" />
   </ bean >
 
   < bean id = "redisUtils" class = "com.silence.spring.redis.readwriteseparation.util.RedisUtils" >
     < property name = "masterJedisPool" ref = "masterJedisPool" />
     < property name = "slaveJedisPool" ref = "slaveJedisPool" />
   </ bean >
 
</ beans >

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我.

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