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Hibernate+EhCache配置二级缓存

来源: sjsky 分享至:

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: <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 :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

转载请注明来自:Michael's blog @ http://sjsky.iteye.com



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