(12) Hibernate+EhCache配置二级缓存

转载地址 http://jyao.iteye.com/blog/1315726

(有关EhCache的基础介绍可参见：http://sjsky.iteye.com/blog/1288257 )

本文主要讲一讲Hibernate+EhCache配置二级缓存的基本使用方法，主要分以下两个方面介绍：

一Cache的多种配置方法

二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=" />

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
}
. 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
}

(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 implementsSerializable { //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>

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 :org.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。