前言
大家在工作中可能會(huì)遇到這樣的需求,即Redis讀寫分離,目的是為了壓力分散化。下面我將為大家介紹借助AWS的ELB實(shí)現(xiàn)讀寫分離,以寫主讀從為例。
實(shí)現(xiàn)
引用庫文件
!-- redis客戶端 -->
dependency>
groupId>redis.clients/groupId>
artifactId>jedis/artifactId>
version>2.6.2/version>
/dependency>
方式一,借助切面
JedisPoolSelector
此類的目的是為讀和寫分別配置不同的注解,用來區(qū)分是主還是從。
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
此類的目的是針對(duì)主和從的注解,進(jìn)行動(dòng)態(tài)鏈接池調(diào)配,即主的使用主鏈接池,從的使用從連接池。
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
此類目的是存儲(chǔ)當(dāng)前使用的JedisPool,即上面類賦值后的結(jié)果保存。
package com.silence.spring.redis.readwriteseparation;
import redis.clients.jedis.JedisPool;
/**
* Created by keysilence on 16/10/26.
*/
public class DynamicJedisPoolHolder {
public static final ThreadLocalJedisPool> holder = new ThreadLocalJedisPool>();
public static void putJedisPool(JedisPool jedisPool) {
holder.set(jedisPool);
}
public static JedisPool getJedisPool() {
return holder.get();
}
}
RedisUtils
此類目的是對(duì)Redis具體的調(diào)用,里面包含使用主還是從的方式調(diào)用。
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
?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">
!-- 池中最大鏈接數(shù) -->
property name="maxTotal" value="100"/>
!-- 池中最大空閑鏈接數(shù) -->
property name="maxIdle" value="50"/>
!-- 池中最小空閑鏈接數(shù) -->
property name="minIdle" value="20"/>
!-- 當(dāng)池中鏈接耗盡,調(diào)用者最大阻塞時(shí)間,超出此時(shí)間將跑出異常。(單位:毫秒;默認(rèn)為-1,表示永不超時(shí)) -->
property name="maxWaitMillis" value="1000"/>
!-- 參考:http://biasedbit.com/redis-jedispool-configuration/ -->
!-- 調(diào)用者獲取鏈接時(shí),是否檢測當(dāng)前鏈接有效性。無效則從鏈接池中移除,并嘗試?yán)^續(xù)獲取。(默認(rèn)為false) -->
property name="testOnBorrow" value="true" />
!-- 向鏈接池中歸還鏈接時(shí),是否檢測鏈接有效性。(默認(rèn)為false) -->
property name="testOnReturn" value="true" />
!-- 調(diào)用者獲取鏈接時(shí),是否檢測空閑超時(shí)。如果超時(shí),則會(huì)被移除(默認(rèn)為false) -->
property name="testWhileIdle" value="true" />
!-- 空閑鏈接檢測線程一次運(yùn)行檢測多少條鏈接 -->
property name="numTestsPerEvictionRun" value="10" />
!-- 空閑鏈接檢測線程檢測周期。如果為負(fù)值,表示不運(yùn)行檢測線程。(單位:毫秒,默認(rèn)為-1) -->
property name="timeBetweenEvictionRunsMillis" value="60000" />
!-- 鏈接獲取方式。隊(duì)列:false;棧: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"/>
!-- 此處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
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,依賴注入
與方式一類似,但是需要寫死具體使用主的池還是從的池,思路如下:
放棄注解的方式,直接將主和從的兩個(gè)鏈接池注入到具體實(shí)現(xiàn)類中。
RedisUtils
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
?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">
!-- 池中最大鏈接數(shù) -->
property name="maxTotal" value="100"/>
!-- 池中最大空閑鏈接數(shù) -->
property name="maxIdle" value="50"/>
!-- 池中最小空閑鏈接數(shù) -->
property name="minIdle" value="20"/>
!-- 當(dāng)池中鏈接耗盡,調(diào)用者最大阻塞時(shí)間,超出此時(shí)間將跑出異常。(單位:毫秒;默認(rèn)為-1,表示永不超時(shí)) -->
property name="maxWaitMillis" value="1000"/>
!-- 參考:http://biasedbit.com/redis-jedispool-configuration/ -->
!-- 調(diào)用者獲取鏈接時(shí),是否檢測當(dāng)前鏈接有效性。無效則從鏈接池中移除,并嘗試?yán)^續(xù)獲取。(默認(rèn)為false) -->
property name="testOnBorrow" value="true" />
!-- 向鏈接池中歸還鏈接時(shí),是否檢測鏈接有效性。(默認(rèn)為false) -->
property name="testOnReturn" value="true" />
!-- 調(diào)用者獲取鏈接時(shí),是否檢測空閑超時(shí)。如果超時(shí),則會(huì)被移除(默認(rèn)為false) -->
property name="testWhileIdle" value="true" />
!-- 空閑鏈接檢測線程一次運(yùn)行檢測多少條鏈接 -->
property name="numTestsPerEvictionRun" value="10" />
!-- 空閑鏈接檢測線程檢測周期。如果為負(fù)值,表示不運(yùn)行檢測線程。(單位:毫秒,默認(rèn)為-1) -->
property name="timeBetweenEvictionRunsMillis" value="60000" />
!-- 鏈接獲取方式。隊(duì)列:false;棧: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內(nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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