Hibernate+EhCache配置二级缓存

阅读更多

FROM:  http://sjsky.iteye.com/blog/1312132

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：

 

(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： 

        (3).映射文件*.hb.xml中标签配置方式：  

      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

    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">mytestproperty>
        <property name="connection.password">111111property>

        <property name="dialect">
            org.hibernate.dialect.Oracle9Dialect
        property>

        <property name="connection.useUnicode">trueproperty>
        <property name="connection.characterEncoding">UTF-8property>
        <property name="connection.SetBigStringTryClob">trueproperty>
        <property name="connection.pool_size">10property>
        <property name="hibernate.jdbc.batch_size">10property>


        <property name="show_sql">trueproperty>
        <property name="format_sql">falseproperty>
        <property name="current_session_context_class">threadproperty>
        <property name="hbm2ddl.auto">updateproperty>



        <property name="hibernate.cache.use_second_level_cache">
            true
        property>
        <property name="hibernate.cache.use_query_cache">
            true
        property>


        <mapping class="michael.cache.ehcache.hibernate.EhUserInfo" />
        <mapping class="michael.cache.ehcache.hibernate.EhBlogTopic" />
        <mapping class="michael.cache.ehcache.hibernate.EhBlogTopic2" />


        <mapping
            resource="michael/cache/ehcache/hibernate/tb_EhBlogTopic3.hb.xml" />


        <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"?>

    "-//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 :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。

 

 

本文连接：http://sjsky.iteye.com/blog/1312132

• Hibernate缓存深入详解.rar (1.9 MB)
• 下载次数: 246

• Spring事务详解.rar (626.9 KB)
• 下载次数: 102