(有关EhCache的基础介绍可参见：http://sjsky.iteye.com/blog/1288257 )
* Cache的多种配置方法
* Hibernate+EhCache集成demo
[一]、Cache的多种配置方法
Javabean cache的配置有三种，下面将一一介绍,具体如下：：
(1).bean中注解配置的方式： @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
(2).hibernate.cfg.xml中标签配置方式： <class-cache class="" usage="" />
(3).映射文件*.hb.xml中标签配置方式： <cache usage=" />
1. classpath:ehcahce.xml配置文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ehcache.xsd"
updateCheck="true" monitoring="autodetect"
dynamicConfig="true">
<diskStore path="java.io.tmpdir"/>
<transactionManagerLookup class="net.sf.ehcache.transaction.manager.DefaultTransactionManagerLookup"
properties="jndiName=java:/TransactionManager" propertySeparator=";"/>
<cacheManagerEventListenerFactory class="" properties=""/>
<defaultCache
maxElementsInMemory="100"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
diskSpoolBufferSizeMB="30"
maxElementsOnDisk="100"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
memoryStoreEvictionPolicy="LRU"
statistics="false"
/>
<cache name="org.hibernate.cache.StandardQueryCache"
maxElementsInMemory="5"
eternal="false"
timeToLiveSeconds="120"
overflowToDisk="true" />
<cache name="org.hibernate.cache.UpdateTimestampsCache"
maxElementsInMemory="5000"
eternal="true"
overflowToDisk="true" />
<cache name="sampleCache1"
maxElementsInMemory="10000"
maxElementsOnDisk="1000"
eternal="false"
overflowToDisk="true"
diskSpoolBufferSizeMB="20"
timeToIdleSeconds="300"
timeToLiveSeconds="600"
memoryStoreEvictionPolicy="LFU"
transactionalMode="off"
/>
<cache name="sampleCache2"
maxElementsInMemory="1000"
eternal="true"
overflowToDisk="false"
memoryStoreEvictionPolicy="FIFO"
/>
</ehcache>
2.hibernate配置文件：hibernate.cfg.xml
<!DOCTYPE hibernate-configuration
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">
oracle.jdbc.driver.OracleDriver
</property>
<property name="connection.url">
jdbc:oracle:thin:@localhost:1521:ora11g
</property>
<property name="connection.username">mytest</property>
<property name="connection.password">111111</property>
<property name="dialect">
org.hibernate.dialect.Oracle9Dialect
</property>
<property name="connection.useUnicode">true</property>
<property name="connection.characterEncoding">UTF-8</property>
<property name="connection.SetBigStringTryClob">true</property>
<property name="connection.pool_size">10</property>
<property name="hibernate.jdbc.batch_size">10</property>
<property name="show_sql">true</property>
<property name="format_sql">false</property>
<property name="current_session_context_class">thread</property>
<property name="hbm2ddl.auto">update</property>
<!-- Hibernate 3.3 and higher -->
<!--
<property name="hibernate.cache.region.factory_class">
net.sf.ehcache.hibernate.EhCacheRegionFactory
</property>
<property name="hibernate.cache.region.factory_class">
net.sf.ehcache.hibernate.SingletonEhCacheRegionFactory
</property>
-->
<!-- hibernate3.0-3.2 cache config-->
<!--
<property name="hibernate.cache.region.factory_class">
net.sf.ehcache.hibernate.EhCacheProvider
</property>
-->
<property name="hibernate.cache.provider_class">
net.sf.ehcache.hibernate.SingletonEhCacheProvider
</property>
<!-- Enable Second-Level Cache and Query Cache Settings -->
<property name="hibernate.cache.use_second_level_cache">
true
</property>
<property name="hibernate.cache.use_query_cache">
true
</property>
<!-- 注解配置 -->
<mapping class="michael.cache.ehcache.hibernate.EhUserInfo" />
<mapping class="michael.cache.ehcache.hibernate.EhBlogTopic" />
<mapping class="michael.cache.ehcache.hibernate.EhBlogTopic2" />
<!-- 映射文件 -->
<mapping
resource="michael/cache/ehcache/hibernate/tb_EhBlogTopic3.hb.xml" />
<!-- class-cache config -->
<class-cache class="michael.cache.ehcache.hibernate.EhBlogTopic"
usage="read-write" />
</session-factory>
</hibernate-configuration>
3.相关javabean代码片段如下：
(1).hibernate.cfg.xml中<calss-cache>标签配置的：EhBlogTopic.java:
/**
* @blog http://sjsky.iteye.com
* @author Michael
*/
@Entity
@Table(name = "MY_TB_EH_BLOG_TOPIC")
public class EhBlogTopic implements Serializable {
/**
* serialVersionUID
*/
private static final long serialVersionUID = -570936907944909799L;
private Integer id;
private String userId;
private String topic;
private String site;
//其他省略
}
(2). bean中注解的方式配置cache的：EhBlogTopic2.java
/**
* @blog http://sjsky.iteye.com
* @author Michael
*/
@Entity
@Table(name = "MY_TB_EH_BLOG_TOPIC2")
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class EhBlogTopic2 implements Serializable {
//属性和EhBlogTopic一样
//其他省略
}
(3). 映射文件*.hb.xml中添加cache标签的： EhBlogTopic3.java
/**
* @blog http://sjsky.iteye.com
* @author Michael
*/
public class EhBlogTopic3 implements Serializable {
//属性和EhBlogTopic一样
//其他省略
}
tb_EhBlogTopic3.hb.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="michael.cache.ehcache.hibernate">
<class name="EhBlogTopic3" table="MY_TB_EH_BLOG_TOPIC3">
<cache usage="read-write" />
<id name="id" type="int" unsaved-value="null">
<generator class="increment" />
</id>
<property name="userId" column="USER_ID" type="string"
not-null="false" length="20" />
<property name="topic" column="TOPIC" type="string"
not-null="false" length="100" />
<property name="site" column="SITE" type="string"
not-null="false" length="100" />
</class>
</hibernate-mapping>
(4). 没有配置cache的bean:EhUserInfo.java
/**
* @blog http://sjsky.iteye.com
* @author Michael
*/
@Entity
@Table(name = "MY_TB_EH_USER_INFO")
public class EhUserInfo implements Serializable {
/**
* serialVersionUID
*/
private static final long serialVersionUID = 930384253681679239L;
private Integer id;
private String userId;
private String userName;
private String otherInfo;
/**
* @return the id
*/
@Id
@GeneratedValue
@Column(name = "ID")
public Integer getId() {
return id;
}
//其他省略。。。
}
4.测试运行代码如下：
package michael.cache.ehcache.hibernate;
import java.util.List;
import michael.hibernate.bigstring.oracle.BigStrBlob;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
/**
*
* @blog http://sjsky.iteye.com
* @author Michael
*/
public class TestEhcacheHibernate {
/**
* @param args
*/
@SuppressWarnings("unchecked")
public static void main(String[] args) {
testMulitConfigMethod();
}
/**
* 测试多种配置缓存的方法
*/
public static void testMulitConfigMethod() {
SessionFactory sessionFactory = null;
try {
System.out.println("ehcache - hibernate Test ...");
Configuration config = new AnnotationConfiguration()
.configure("michael/cache/ehcache/hibernate/hibernate.cfg.xml");
System.out.println("hibernate config successful :" + config);
sessionFactory = config.buildSessionFactory();
Transaction ta = null;
try {
Session session = sessionFactory.getCurrentSession();
ta = session.beginTransaction();
} catch (Exception e) {
e.printStackTrace();
ta.rollback();
}
String[] cacheNames = CacheManager.getInstance().getCacheNames();
System.out.println("缓存的key cacheNames length := "
+ cacheNames.length + " 具体详细列表如下：");
for (String name : cacheNames) {
System.out.println("name := " + name);
}
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("ehcache - hibernate Test end.");
}
}
运行结果如下：
ehcache - hibernate Test ...
hibernate config successful
rg.hibernate.cfg.AnnotationConfiguration@193c0cf
2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic]; using defaults.
2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic2]; using defaults.
2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic3]; using defaults.
2011-12-15 11:32:37 net.sf.ehcache.util.UpdateChecker doCheck
信息: New update(s) found: 2.4.6 [http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.4]. Please check http://ehcache.org for the latest version.
缓存的key cacheNames length := 7 具体详细列表如下：
name := sampleCache2
name := michael.cache.ehcache.hibernate.EhBlogTopic2
name := org.hibernate.cache.UpdateTimestampsCache
name := sampleCache1
name := michael.cache.ehcache.hibernate.EhBlogTopic
name := org.hibernate.cache.StandardQueryCache
name := michael.cache.ehcache.hibernate.EhBlogTopic3
ehcache - hibernate Test end.
从运行结果可见：三种方式的缓存配置都已经成功。
[二]、Hibernate+EhCache集成demo
1.分别初始化EhUserInfo（没有配置cache的）和EhBlogTopic（配置过cache的）数据如下：
EhUserInfo：
EhBlogTopic：
2.演示代码：
package michael.cache.ehcache.hibernate;
import java.util.List;
import michael.hibernate.bigstring.oracle.BigStrBlob;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
/**
*
* @blog http://sjsky.iteye.com
* @author Michael
*/
public class TestEhcacheHibernate {
/**
* @param args
*/
@SuppressWarnings("unchecked")
public static void main(String[] args) {
SessionFactory sessionFactory = null;
try {
System.out.println("ehcache - hibernate Test ...");
Configuration config = new AnnotationConfiguration()
.configure("michael/cache/ehcache/hibernate/hibernate.cfg.xml");
sessionFactory = config.buildSessionFactory();
System.out.println("buildSessionFactory===============");
System.out.println("====================================");
System.out.println("session open ....");
System.out.println("同一个session(一级缓存默认的)中，没有配置cache的Bean");
Transaction ta = null;
try {
Session session = sessionFactory.getCurrentSession();
String hsql = "select t from EhUserInfo t ";
ta = session.beginTransaction();
Query query = session.createQuery(hsql);
System.out.println("查询全部query.list().size:"
+ query.list().size());
System.out.println("再根据ID=1查询某记录时不会再去查数据库,故不会打印hsql");
EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);
System.out.println("根据ID=1找到的记录:" + vo1);
ta.commit();
} catch (Exception e) {
e.printStackTrace();
ta.rollback();
}
System.out.println("session closed.");
System.out.println("session open ....");
try {
Session session = sessionFactory.getCurrentSession();
ta = session.beginTransaction();
System.out.println("第一次根据ID=1查询某记录时,会打印hsql");
EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);
System.out.println("根据ID=1找到的记录:" + vo1);
ta.commit();
} catch (Exception e) {
e.printStackTrace();
ta.rollback();
}
System.out.println("session closed.");
System.out.println("====================================");
System.out.println("当前同一个sessionFactory，没有配置cache的Bean,");
System.out.println("session open ....");
try {
Session session = sessionFactory.getCurrentSession();
ta = session.beginTransaction();
System.out.println("第一次根据ID=1查询记录时会再去查数据库,故打印hsql如下：");
EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);
System.out.println("根据ID=1找到的记录:" + vo1);
ta.commit();
} catch (Exception e) {
e.printStackTrace();
ta.rollback();
}
System.out.println("session closed.");
System.out.println("====================================");
String[] cacheNames = CacheManager.getInstance().getCacheNames();
System.out.println("缓存的key cacheNames length := "
+ cacheNames.length);
for (String name : cacheNames) {
System.out.println("name := " + name);
}
System.out.println("====================================");
System.out.println("同一个session(一级缓存默认的)中，配置cache的Bean");
System.out.println("session open ....");
try {
Session session = sessionFactory.getCurrentSession();
String hsql = "select t from EhBlogTopic t ";
ta = session.beginTransaction();
Query query = session.createQuery(hsql);
query.setCacheable(true);
System.out.println("查询全部query.list().size:"
+ query.list().size());
Cache myCache1 = CacheManager.getInstance().getCache(
"michael.cache.ehcache.hibernate.EhBlogTopic");
System.out.println("查询到EhBlogTopic cache size:"
+ myCache1.getKeys().size());
myCache1 = CacheManager.getInstance().getCache(
"michael.cache.ehcache.hibernate.EhBlogTopic");
System.out.println("EhBlogTopic cache size:"
+ myCache1.getKeys().size() + ",详细记录如下：");
for (Object str : myCache1.getKeys()) {
System.out.println(str);
}
System.out
.println("在同一个session，再根据ID=1查询记录时不会再去查数据库,故不会打印hsql");
EhBlogTopic vo1 = (EhBlogTopic) session.get(EhBlogTopic.class,
1);
System.out.println("根据ID=1找到的记录:" + vo1);
EhBlogTopic vo2 = new EhBlogTopic();
vo2.setId(10);
vo2.setUserId("michael");
vo2.setTopic("Myblog:11");
vo2.setSite("http://sjsky.iteye.com");
session.save(vo2);
ta.commit();
System.out.println("新增加一条记录ID=10");
} catch (Exception e) {
e.printStackTrace();
ta.rollback();
}
System.out.println("session closed.");
System.out.println("====================================");
Cache myCache1 = CacheManager.getInstance().getCache(
"michael.cache.ehcache.hibernate.EhBlogTopic");
System.out.println("EhBlogTopic cache size:"
+ myCache1.getKeys().size() + ",详细记录如下：");
for (Object str : myCache1.getKeys()) {
System.out.println(str);
}
System.out.println("====================================");
System.out.println("在当前同一个sessionFactory，配置cache的bean");
System.out.println("session open ....");
try {
Session session = sessionFactory.getCurrentSession();
ta = session.beginTransaction();
System.out
.println("不管是否第一次查询ID=1的记录，如果cache中存在的，则不会再查数据库,故不打印hsql");
EhBlogTopic vo1 = (EhBlogTopic) session.get(EhBlogTopic.class,
1);
System.out.println("根据ID=1找到的记录:" + vo1);
System.out.println("查询之前session保存的数据ID=10，也不会再查数据库,故不打印hsql");
EhBlogTopic vo2 = (EhBlogTopic) session.get(EhBlogTopic.class,
10);
System.out.println("根据之前save的ID=10找到的记录:" + vo2);
ta.commit();
} catch (Exception e) {
e.printStackTrace();
ta.rollback();
}
System.out.println("session closed.");
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != sessionFactory) {
sessionFactory.close();
}
}
System.out.println("sessionFactory closed.");
}
}
运行结果如下：
ehcache - hibernate Test ...
2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic]; using defaults.
2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic2]; using defaults.
2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic3]; using defaults.
buildSessionFactory===============
====================================
session open ....
同一个session(一级缓存默认的)中，没有配置cache的Bean
Hibernate: select ehuserinfo0_.ID as ID1_, ehuserinfo0_.USER_ID as USER2_1_, ehuserinfo0_.USER_NAME as USER3_1_, ehuserinfo0_.OHTER_INFO as OHTER4_1_ from MY_TB_EH_USER_INFO ehuserinfo0_
查询全部query.list().size:2
再根据ID=1查询某记录时不会再去查数据库,故不会打印hsql
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@63b2e6
session closed.
session open ....
第一次根据ID=1查询某记录时,会打印hsql
Hibernate: select ehuserinfo0_.ID as ID1_0_, ehuserinfo0_.USER_ID as USER2_1_0_, ehuserinfo0_.USER_NAME as USER3_1_0_, ehuserinfo0_.OHTER_INFO as OHTER4_1_0_ from MY_TB_EH_USER_INFO ehuserinfo0_ where ehuserinfo0_.ID=?
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@123a389
session closed.
====================================
当前同一个sessionFactory，没有配置cache的Bean,
session open ....
第一次根据ID=1查询记录时会再去查数据库,故打印hsql如下：
Hibernate: select ehuserinfo0_.ID as ID1_0_, ehuserinfo0_.USER_ID as USER2_1_0_, ehuserinfo0_.USER_NAME as USER3_1_0_, ehuserinfo0_.OHTER_INFO as OHTER4_1_0_ from MY_TB_EH_USER_INFO ehuserinfo0_ where ehuserinfo0_.ID=?
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@429c19
session closed.
====================================
缓存的key cacheNames length := 7
name := sampleCache2
name := michael.cache.ehcache.hibernate.EhBlogTopic2
name := org.hibernate.cache.UpdateTimestampsCache
name := sampleCache1
name := michael.cache.ehcache.hibernate.EhBlogTopic
name := org.hibernate.cache.StandardQueryCache
name := michael.cache.ehcache.hibernate.EhBlogTopic3
====================================
同一个session(一级缓存默认的)中，配置cache的Bean
session open ....
Hibernate: select ehblogtopi0_.ID as ID2_, ehblogtopi0_.USER_ID as USER2_2_, ehblogtopi0_.TOPIC as TOPIC2_, ehblogtopi0_.SITE as SITE2_ from MY_TB_EH_BLOG_TOPIC ehblogtopi0_
查询全部query.list().size:9
查询到EhBlogTopic cache size:9
EhBlogTopic cache size:9,详细记录如下：
michael.cache.ehcache.hibernate.EhBlogTopic#6
michael.cache.ehcache.hibernate.EhBlogTopic#5
michael.cache.ehcache.hibernate.EhBlogTopic#7
michael.cache.ehcache.hibernate.EhBlogTopic#8
michael.cache.ehcache.hibernate.EhBlogTopic#2
michael.cache.ehcache.hibernate.EhBlogTopic#9
michael.cache.ehcache.hibernate.EhBlogTopic#1
michael.cache.ehcache.hibernate.EhBlogTopic#4
michael.cache.ehcache.hibernate.EhBlogTopic#3
在同一个session，再根据ID=1查询记录时不会再去查数据库,故不会打印hsql
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@11a0d35
Hibernate: insert into MY_TB_EH_BLOG_TOPIC (USER_ID, TOPIC, SITE, ID) values (?, ?, ?, ?)
新增加一条记录ID=10
session closed.
====================================
EhBlogTopic cache size:10,详细记录如下：
michael.cache.ehcache.hibernate.EhBlogTopic#6
michael.cache.ehcache.hibernate.EhBlogTopic#5
michael.cache.ehcache.hibernate.EhBlogTopic#7
michael.cache.ehcache.hibernate.EhBlogTopic#8
michael.cache.ehcache.hibernate.EhBlogTopic#2
michael.cache.ehcache.hibernate.EhBlogTopic#9
michael.cache.ehcache.hibernate.EhBlogTopic#10
michael.cache.ehcache.hibernate.EhBlogTopic#1
michael.cache.ehcache.hibernate.EhBlogTopic#4
michael.cache.ehcache.hibernate.EhBlogTopic#3
====================================
在当前同一个sessionFactory，配置cache的bean
session open ....
不管是否第一次查询ID=1的记录，如果cache中存在的，则不会再查数据库,故不打印hsql
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@1321f5
查询之前session保存的数据ID=10，也不会再查数据库,故不打印hsql
根据之前save的ID=10找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@1a6518
session closed.
sessionFactory closed.
我们从上面的详细运行日志中就可以看出cache的效果。