我正在使用带有 Hibernate 4.3.5 的 ehcache-2.9.0，我已经正确配置它并且 EHCache 在以下缓存并发策略中工作正常：READ_ONLY NONSTRICT_READ_WRITE TRANSACTIONAL
但它不适用于 READ_WRITE，Statistics stats = sessionFactory.getStatistics(); 在 READ_WRITE 的情况下，stats.getSecondLevelCacheHitCount()) 始终为 0。我在简单的 JAVA 项目中使用它。请浏览代码和配置文件。请帮忙。
ehcache.xml
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true"
monitoring="autodetect" dynamicConfig="true">
<defaultCache
maxEntriesLocalHeap="10000"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
diskSpoolBufferSizeMB="30"
maxEntriesLocalDisk="10000000"
memoryStoreEvictionPolicy="LRU"
statistics="true">
<persistence strategy="localTempSwap" />
</defaultCache>
<cache name="com.slc.entities.Movie"
maxEntriesLocalHeap="100"
maxEntriesLocalDisk="100"
eternal="false"
diskSpoolBufferSizeMB="20"
timeToIdleSeconds="300"
timeToLiveSeconds="600"
memoryStoreEvictionPolicy="LFU"
transactionalMode="off">
<persistence strategy="localTempSwap" />
</cache>
<cache
name="org.hibernate.cache.StandardQueryCache"
maxEntriesLocalHeap="5"
eternal="false"
timeToLiveSeconds="120">
<persistence strategy="localTempSwap"/>
</cache>
</ehcache>
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.username">usr</property>
<property name="connection.password">pwd</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
<property name="show_sql">true</property>
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.cache.use_query_cache">true</property>
<property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
<!-- Generate Statistics about the Second Level Cache. -->
<property name="hibernate.generate_statistics">true</property>
<mapping resource="com/slc/entities/Movie.hbm.xml" />
<class-cache usage="read-write" class="com.slc.entities.Movie"/>
</session-factory>
</hibernate-configuration>
电影.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.slc.entities">
<class name="Movie" table="MOVIE" mutable="false">
<cache usage="read-write" region="com.slc.entities.Movie" />
<id name="movieId" column="MOVIE_ID">
<generator class="increment"/>
</id>
<property name="movieName" column="MOVIE_NAME"/>
<property name="genere" column="GENERE"/>
<property name="releaseYear" column="RELEASE_YEAR"/>
</class>
</hibernate-mapping>
测试类
public class SLCTest {
public static void main(String[] args) {
Movie movie = null;
try {
// Initialize Sessions
SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Statistics stats = sessionFactory.getStatistics();
System.out.println("Stats enabled=" + stats.isStatisticsEnabled());
Session session = sessionFactory.openSession();
Session otherSession = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
Transaction otherTransaction = otherSession.beginTransaction();
printStats(stats, 0);
movie = (Movie) session.load(Movie.class, 1);
printData(movie, stats, 1);
movie = (Movie) session.load(Movie.class, 1);;
printData(movie, stats, 2);
// clear first level cache, so that second level cache is used
session.evict(movie);
movie = (Movie) session.load(Movie.class, 1);
printData(movie, stats, 3);
movie = (Movie) session.load(Movie.class, 3);
printData(movie, stats, 4);
transaction.commit();
session.close();
movie = (Movie) otherSession.load(Movie.class, 1);
printData(movie, stats, 5);
// Release resources
otherTransaction.commit();
sessionFactory.close();
} finally {
HibernateUtil.closeSessionFactory();
}
}
private static void printStats(Statistics stats, int i) {
System.out.println("***** " + i + " *****");
System.out.println("Fetch Count=" + stats.getEntityFetchCount());
System.out.println("Second Level Hit Count="
+ stats.getSecondLevelCacheHitCount());
System.out.println("Second Level Miss Count="
+ stats.getSecondLevelCacheMissCount());
System.out.println("Second Level Put Count="
+ stats.getSecondLevelCachePutCount());
System.out.println("****** end stats ******");
}
private static void printData(Movie movie, Statistics stats, int count) {
System.out.println(movie);
System.out.println(movie.getMovieName());
printStats(stats, count);
}
}