考虑过后，以redis做mybatis二级缓存，用虚拟主机Mapper为主，其他Mapper将命名空间指向虚拟主机Mapper

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="com.sunyo.wlpt.message.bus.service.mapper.BusExchangeMapper">
-      
+    <cache-ref namespace="com.sunyo.wlpt.message.bus.service.mapper.VirtualHostMapper"/>
     <resultMap id="BaseResultMap" type="com.sunyo.wlpt.message.bus.service.domain.BusExchange">
         <!--@mbg.generated-->
         <!--@Table bus_exchange-->

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="com.sunyo.wlpt.message.bus.service.mapper.BusQueueMapper">
+    <cache-ref namespace="com.sunyo.wlpt.message.bus.service.mapper.VirtualHostMapper"/>
     <resultMap id="BaseResultMap" type="com.sunyo.wlpt.message.bus.service.domain.BusQueue">
         <!--@mbg.generated-->
         <!--@Table bus_queue-->

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="com.sunyo.wlpt.message.bus.service.mapper.BusServerMapper">
+    <cache-ref namespace="com.sunyo.wlpt.message.bus.service.mapper.VirtualHostMapper"/>
     <resultMap id="BaseResultMap" type="com.sunyo.wlpt.message.bus.service.domain.BusServer">
         <!--@mbg.generated-->
         <!--@Table bus_server-->

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="com.sunyo.wlpt.message.bus.service.mapper.RoutingKeyMapper">
+    <cache-ref namespace="com.sunyo.wlpt.message.bus.service.mapper.VirtualHostMapper"/>
     <resultMap id="BaseResultMap" type="com.sunyo.wlpt.message.bus.service.domain.RoutingKey">
         <!--@mbg.generated-->
         <!--@Table routing_key-->

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="com.sunyo.wlpt.message.bus.service.mapper.VirtualHostMapper">
+    <cache type="com.sunyo.wlpt.message.bus.service.cache.RedisCache"/>
     <resultMap id="BaseResultMap" type="com.sunyo.wlpt.message.bus.service.domain.VirtualHost">
         <!--@mbg.generated-->
         <!--@Table virtual_host-->