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服务器之家。