如何解决在Tomcat中通过带有Spring的JMX公开Hibernate缓存统计信息
我最终写了下面的课
import javax.management.JMException;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.persistence.EntityManagerFactory;
import org.hibernate.SessionFactory;
import org.hibernate.ejb.HibernateEntityManagerFactory;
import org.hibernate.jmx.StatisticsService;
import org.springframework.beans.factory.annotation.Autowired;
/**
* Provides code to register Hibernate's statistics bean with a JMX MBean server. Assumes that both
* the MBeanServer and the EntityManagerFactory are available as Spring-managed beans. Note that
* while registering this class enables the collection of statistics even if that was previously
* disabled.
* <p>
* May become obsolete once <a href="https://hibernate.onjira.com/browse/HHH-6034">HHH-6034</a> is
* implemented. Even if not the confusing situation abround the meanwhile deprecated
* {@link StatisticsService} should be clear then.
*/
@SuppressWarnings({"deprecation", "javadoc" })
public class HibernateStatisticsJmxRegistration {
@Autowired
private EntityManagerFactory entityManagerFactory;
@Autowired
private MBeanServer mbeanServer;
private ObjectName objectName;
private String jmxObjectName = "org.hibernate:name=HibernateStatistics";
/**
* Registers the statistics MBean that wraps a Hibernate session factory. The bean is registered
* under the name provided by {@link HibernateStatisticsJmxRegistration#getJmxObjectName()}.
*
* @throws JMException if anything fails..
* @see HibernateStatisticsJmxRegistration#unregister()
*/
public void register() throws JMException {
final SessionFactory sessionFactory = ((HibernateEntityManagerFactory) entityManagerFactory).getSessionFactory();
objectName = new ObjectName(jmxObjectName);
final StatisticsService statsMBean = new StatisticsService();
statsMBean.setSessionFactory(sessionFactory);
statsMBean.setStatisticsEnabled(true);
mbeanServer.registerMBean(statsMBean, objectName);
}
/**
* Unregisters the MBean that was registered.
*
* @throws JMException if the de-registration fails
* @see HibernateStatisticsJmxRegistration#register()
*/
public void unregister() throws JMException {
mbeanServer.unregisterMBean(objectName);
}
/**
* Override the default JMX object name. Obviously you need to call this method before
* registration for it to have any effect. The string must comply to the rules described in
* {@link ObjectName}. Suggested is {@code <domain>:name=<name>}.
*
* @param jmxObjectName the name to use during registration
*/
public void setJmxObjectName(String jmxObjectName) {
this.jmxObjectName = jmxObjectName;
}
}
<!-- Setting up Ehcache manager for various caches (offer facade, images). -->
<bean id="ehCacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
<property name="configLocation" value="classpath:ehcache.xml" />
</bean>
<ehcache:annotation-driven cache-manager="ehCacheManager" />
<!-- Exposing cache statistics through JMX. -->
<context:mbean-server />
<bean class="net.sf.ehcache.management.ManagementService" init-method="init">
<constructor-arg ref="ehCacheManager"/>
<constructor-arg ref="mbeanServer"/>
<constructor-arg value="true"/>
<constructor-arg value="true"/>
<constructor-arg value="true"/>
<constructor-arg value="true"/>
</bean>
<bean class="HibernateStatisticsJmxRegistration"
init-method="register" destroy-method="unregister" />
解决方法
在基于Spring的设置中收集Hibernate /
Ehcache统计信息并通过JMX公开它们似乎很容易。互联网上有很多资源可以提供帮助,例如http://snippets.dzone.com/posts/show/11159
但是,所有这些文章都假设有人正在使用某种Hibernate会话工厂。我不是-
我的实体带有JPA注释,并且使用javax.persistence.EntityManager
。如果我要部署到Java
EE容器,则可以通过JNDI获得Hibernate会话工厂,如此处所述http://internna.blogspot.com/2007/08/hibernate-
statistics-in-
enterprise-5.html但我在使用Tomcat …
怎么办呢?我还没有想出解决方案。
如果我引用了Ehcache CacheManager
,则可以尝试以下操作:
<context:mbean-server />
<bean class="net.sf.ehcache.management.ManagementService" init-method="init">
<constructor-arg ref="..myCacheManager.."/>
<constructor-arg ref="mbeanServer"/>
<constructor-arg value="true"/>
<constructor-arg value="true"/>
<constructor-arg value="true"/>
<constructor-arg value="true"/>
</bean>
由于缓存管理器是由Hibernate创建的(即它不是Spring Bean),因此将无法工作。我尝试用
<constructor-arg><bean id="cacheManager" class="net.sf.ehcache.CacheManager" factory-method="getInstance"/></constructor-arg>
希望我能以某种方式抓住合适的实例。也不起作用,因为这实际上会创建一个新的缓存管理器实例。