在Tomcat中通过带有Spring的JMX公开Hibernate（缓存）统计信息

Question

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。

Answer 1

我最终写了下面的课

HibernateStatisticsJmxRegistration

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;
  }
}

弹簧配置

<!-- 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" />