一、創(chuàng)建基于ThreadLocal的動(dòng)態(tài)數(shù)據(jù)源容器，保證數(shù)據(jù)源的線程安全性
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package com.bounter.mybatis.extension;/** * 基于ThreadLocal實(shí)現(xiàn)的動(dòng)態(tài)數(shù)據(jù)源容器，保證DynamicDataSource的線程安全性 * @author simon * */public class DynamicDataSourceHolder { private static final ThreadLocal<String> dataSourceHolder = new ThreadLocal<>(); public static void setDataSource(String dataSourceKey) { dataSourceHolder.set(dataSourceKey); } public static String getDataSource() { return dataSourceHolder.get(); } public static void clearDataSource() { dataSourceHolder.remove(); }} |
二、定義Spring動(dòng)態(tài)數(shù)據(jù)源擴(kuò)展類,用來(lái)實(shí)現(xiàn)Master、Slave數(shù)據(jù)源動(dòng)態(tài)切換
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package com.bounter.mybatis.extension;import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;/** * 自定義的Spring 動(dòng)態(tài)數(shù)據(jù)源擴(kuò)展類,用來(lái)實(shí)現(xiàn)Master、Slave數(shù)據(jù)源動(dòng)態(tài)切換 * @author simon * */public class DynamicDataSource extends AbstractRoutingDataSource { @Override protected Object determineCurrentLookupKey() { //使用DynamicDataSourceHolder保證線程安全 return DynamicDataSourceHolder.getDataSource(); }} |
三、配置Master、Slave數(shù)據(jù)源
1. db.properties配置Master、Slave數(shù)據(jù)信息
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# Master DBdb.master.url=jdbc:mysql://192.168.168.110:3306/bounter?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&serverTimezone=PRC&useSSL=falsedb.master.username=bounter# AES encrypt,Base64 encodedb.master.password=ZNhnEjauk3pecZxxS84ofA==# Slave DBdb.slave.url=jdbc:mysql://192.168.168.111:3306/database?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&serverTimezone=PRC&useSSL=falsedb.slave.username=bounter# AES encrypt,Base64 encodedb.slave.password=jFYmt2f57RHhzItYDhWiSA== |
2. Spring 配置文件配置Master、Slave連接池，動(dòng)態(tài)數(shù)據(jù)源
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<!-- Master數(shù)據(jù)源 --><bean id="masterDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本屬性 url、user、password --> <property name="url" value="${db.master.url}" /> <property name="username" value="${db.master.username}" /> <property name="password" value="${db.master.password}" /> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="20" /> <property name="minIdle" value="1" /> <property name="maxActive" value="40" /> <!-- 配置獲取連接等待超時(shí)的時(shí)間 --> <property name="maxWait" value="60000" /> <!-- 配置間隔多久才進(jìn)行一次檢測(cè)，檢測(cè)需要關(guān)閉的空閑連接，單位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一個(gè)連接在池中最小生存的時(shí)間，單位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="validationQuery" value="SELECT 'x'" /> <property name="testWhileIdle" value="true" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <!-- 配置監(jiān)控統(tǒng)計(jì)攔截的filters --> <property name="filters" value="stat" /></bean><!-- Slave數(shù)據(jù)源 --><bean id="slaveDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本屬性 url、user、password --> <property name="url" value="${db.slave.url}" /> <property name="username" value="${db.slave.username}" /> <property name="password" value="${db.slave.password}" /> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="20" /> <property name="minIdle" value="1" /> <property name="maxActive" value="40" /> <!-- 配置獲取連接等待超時(shí)的時(shí)間 --> <property name="maxWait" value="60000" /> <!-- 配置間隔多久才進(jìn)行一次檢測(cè)，檢測(cè)需要關(guān)閉的空閑連接，單位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一個(gè)連接在池中最小生存的時(shí)間，單位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="validationQuery" value="SELECT 'x'" /> <property name="testWhileIdle" value="true" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <!-- 配置監(jiān)控統(tǒng)計(jì)攔截的filters --> <property name="filters" value="stat" /></bean><!-- 自定義動(dòng)態(tài)數(shù)據(jù)源 --> <bean id="dataSource" class="com.bounter.mybatis.extension.DynamicDataSource"> <property name="targetDataSources"> <map key-type="java.lang.String"> <!-- 配置讀寫數(shù)據(jù)源 --> <entry value-ref="masterDataSource" key="write"></entry> <entry value-ref="slaveDataSource" key="read"></entry> </map> </property> <property name="defaultTargetDataSource" ref="masterDataSource"></property> </bean> |
四、創(chuàng)建數(shù)據(jù)源切面，通過AOP實(shí)現(xiàn)根據(jù)Dao層方法前綴動(dòng)態(tài)選取讀、寫數(shù)據(jù)源
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package com.bounter.mybatis.aop;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.springframework.context.annotation.EnableAspectJAutoProxy;import org.springframework.stereotype.Component;import com.bounter.mybatis.extension.DynamicDataSourceHolder;/** * 數(shù)據(jù)源切面，通過dao方法前綴決定訪問讀、寫數(shù)據(jù)源 * @author simon * */@Component@Aspect@EnableAspectJAutoProxy(proxyTargetClass = true)public class DataSourceAspect { //讀庫(kù)數(shù)據(jù)源key private static final String DATASOURCE_KEY_READ = "read"; //查詢方法清單 String[] queryMethods = {"find","get","query","count","select"}; /** * dao層方法執(zhí)行前選擇數(shù)據(jù)源 * @param point */ @Before("execution(* com.bounter.mybatis.dao..*.*(..))") public void before(JoinPoint point) { // 獲取到當(dāng)前執(zhí)行的方法名 String methodName = point.getSignature().getName(); //匹配查詢方法 for(String queryMethod : queryMethods) { if(methodName.startsWith(queryMethod)) { //查詢方法設(shè)置數(shù)據(jù)源為讀庫(kù) DynamicDataSourceHolder.setDataSource(DATASOURCE_KEY_READ); break; } } } /** * dao層方法執(zhí)行完后清空數(shù)據(jù)源選擇 * @param point */ @After("execution(* com.bounter.mybatis.dao..*.*(..))") public void after(JoinPoint point) { DynamicDataSourceHolder.clearDataSource(); }} |
github源碼地址：https://github.com/13babybear/bounter-mybatis
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