mybatis缓存之整合第三方缓存工具ehcache
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1、加入以下依赖包
2、配置ehcache.xml
<?xml version="1.0" encoding="UTF-8"?> <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../config/ehcache.xsd"> <!-- 磁盘保存路径 --> <diskStore path="D:44ehcache" /> <defaultCache maxElementsInMemory="10000" maxElementsOnDisk="10000000" eternal="false" overflowToDisk="true" timeToIdleSeconds="120" timeToLiveSeconds="120" diskExpiryThreadIntervalSeconds="120" memoryStoreEvictionPolicy="LRU"> </defaultCache> </ehcache> <!-- 属性说明: l diskStore:指定数据在磁盘中的存储位置。 l defaultCache:当借助CacheManager.add("demoCache")创建Cache时,EhCache便会采用<defalutCache/>指定的的管理策略 以下属性是必须的: l maxElementsInMemory - 在内存中缓存的element的最大数目 l maxElementsOnDisk - 在磁盘上缓存的element的最大数目,若是0表示无穷大 l eternal - 设定缓存的elements是否永远不过期。如果为true,则缓存的数据始终有效,如果为false那么还要根据timeToIdleSeconds,timeToLiveSeconds判断 l overflowToDisk - 设定当内存缓存溢出的时候是否将过期的element缓存到磁盘上 以下属性是可选的: l timeToIdleSeconds - 当缓存在EhCache中的数据前后两次访问的时间超过timeToIdleSeconds的属性取值时,这些数据便会删除,默认值是0,也就是可闲置时间无穷大 l timeToLiveSeconds - 缓存element的有效生命期,默认是0.,也就是element存活时间无穷大 diskSpoolBufferSizeMB 这个参数设置DiskStore(磁盘缓存)的缓存区大小.默认是30MB.每个Cache都应该有自己的一个缓冲区. l diskPersistent - 在VM重启的时候是否启用磁盘保存EhCache中的数据,默认是false。 l diskExpiryThreadIntervalSeconds - 磁盘缓存的清理线程运行间隔,默认是120秒。每个120s,相应的线程会进行一次EhCache中数据的清理工作 l memoryStoreEvictionPolicy - 当内存缓存达到最大,有新的element加入的时候, 移除缓存中element的策略。默认是LRU(最近最少使用),可选的有LFU(最不常使用)和FIFO(先进先出) -->
3、在mapper.xml中使用
<mapper namespace="com.gong.mybatis.dao.EmployeeMapper"> <cache type="org.mybatis.caches.ehcache.EhcacheCache"></cache> ...... </mapper>
4、也可以在其它mapper.xml中引用配置好缓存的mapper
<mapper namespace="com.gong.mybatis.dao.DepartmentMapper"> <cache-ref namespace="com.gong.mybatis.dao.EmployeeMapper"/> ...... </mapper>
最后进行测试二级缓存:
package com.gong.mybatis.test; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Test; import com.gong.mybatis.bean.Department; import com.gong.mybatis.bean.Employee; import com.gong.mybatis.dao.EmployeeMapper; import com.gong.mybatis.mapper.EmployeeMapperDynamicSql; public class TestMybatis4 { public SqlSessionFactory getSqlSessionFactory() throws IOException { String resource = "mybatis-config.xml"; InputStream is = Resources.getResourceAsStream(resource); return new SqlSessionFactoryBuilder().build(is); } @Test public void test() throws IOException { SqlSessionFactory sqlSessionFactory = getSqlSessionFactory(); SqlSession openSession = sqlSessionFactory.openSession(); SqlSession openSession2 = sqlSessionFactory.openSession(); try { EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class); EmployeeMapper mapper2 = openSession2.getMapper(EmployeeMapper.class); Employee em = mapper.getEmpById(1); System.out.println(em); openSession.close(); Employee em2 = mapper2.getEmpById(1); System.out.println(em2); openSession.close(); } finally { // TODO: handle finally clause } } }
输出:
DEBUG 01-22 11:31:12,291 Configuring ehcache from ehcache.xml found in the classpath: file:/F:/ssmwork/mybatis/bin/ehcache.xml (ConfigurationFactory.java:132) DEBUG 01-22 11:31:12,307 Configuring ehcache from URL: file:/F:/ssmwork/mybatis/bin/ehcache.xml (ConfigurationFactory.java:98) DEBUG 01-22 11:31:12,307 Configuring ehcache from InputStream (ConfigurationFactory.java:150) DEBUG 01-22 11:31:12,417 Ignoring ehcache attribute xmlns:xsi (BeanHandler.java:271) DEBUG 01-22 11:31:12,417 Ignoring ehcache attribute xsi:noNamespaceSchemaLocation (BeanHandler.java:271) DEBUG 01-22 11:31:12,417 Disk Store Path: D:44ehcache (DiskStoreConfiguration.java:141) DEBUG 01-22 11:31:12,448 Creating new CacheManager with default config (CacheManager.java:1036) DEBUG 01-22 11:31:12,464 propertiesString is null. (PropertyUtil.java:88) DEBUG 01-22 11:31:12,479 No CacheManagerEventListenerFactory class specified. Skipping... (ConfigurationHelper.java:185) DEBUG 01-22 11:31:13,072 No BootstrapCacheLoaderFactory class specified. Skipping... (Cache.java:955) DEBUG 01-22 11:31:13,072 CacheWriter factory not configured. Skipping... (Cache.java:929) DEBUG 01-22 11:31:13,072 No CacheExceptionHandlerFactory class specified. Skipping... (ConfigurationHelper.java:96) DEBUG 01-22 11:31:13,119 Initialized net.sf.ehcache.store.MemoryStore for com.gong.mybatis.dao.EmployeeMapper (MemoryStore.java:152) DEBUG 01-22 11:31:13,181 Using diskstore path D:44ehcache (DiskStorePathManager.java:169) DEBUG 01-22 11:31:13,181 Holding exclusive lock on D:44ehcache.ehcache-diskstore.lock (DiskStorePathManager.java:170) DEBUG 01-22 11:31:13,197 Failed to delete file com%002egong%002emybatis%002edao%002e%0045mployee%004dapper.data (DiskStorageFactory.java:860) DEBUG 01-22 11:31:13,197 Failed to delete file com%002egong%002emybatis%002edao%002e%0045mployee%004dapper.index (DiskStorageFactory.java:860) DEBUG 01-22 11:31:13,696 Matching data file missing (or empty) for index file. Deleting index file D:44ehcachecom%002egong%002emybatis%002edao%002e%0045mployee%004dapper.index (DiskStorageFactory.java:168) DEBUG 01-22 11:31:13,712 Failed to delete file com%002egong%002emybatis%002edao%002e%0045mployee%004dapper.index (DiskStorageFactory.java:860) DEBUG 01-22 11:31:13,759 Initialised cache: com.gong.mybatis.dao.EmployeeMapper (Cache.java:1165) DEBUG 01-22 11:31:13,759 CacheDecoratorFactory not configured for defaultCache. Skipping for ‘com.gong.mybatis.dao.EmployeeMapper‘. (ConfigurationHelper.java:354) DEBUG 01-22 11:31:13,907 Cache Hit Ratio [com.gong.mybatis.dao.EmployeeMapper]: 0.0 (LoggingCache.java:62) DEBUG 01-22 11:31:14,360 ==> Preparing: select id,last_name lastName,email,gender from tbl_employee where id = ? (BaseJdbcLogger.java:145) DEBUG 01-22 11:31:14,391 ==> Parameters: 1(Integer) (BaseJdbcLogger.java:145) DEBUG 01-22 11:31:14,453 <== Total: 1 (BaseJdbcLogger.java:145) Employee [id=1, lastName=dema, gender=1, email=dema@qq.com, dept=null] DEBUG 01-22 11:31:14,453 put added 0 on heap (Segment.java:425) DEBUG 01-22 11:31:14,469 Cache Hit Ratio [com.gong.mybatis.dao.EmployeeMapper]: 0.5 (LoggingCache.java:62) Employee [id=1, lastName=dema, gender=1, email=dema@qq.com, dept=null] DEBUG 01-22 11:31:14,484 fault removed 0 from heap (Segment.java:779) DEBUG 01-22 11:31:14,484 fault added 0 on disk (Segment.java:796)
说明配置成功。
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