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HibernateInterceptor (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.orm.hibernate
Class HibernateInterceptor

java.lang.Object
  org.springframework.orm.hibernate.HibernateAccessor
      org.springframework.orm.hibernate.HibernateInterceptor

All Implemented Interfaces:

Advice, Interceptor, MethodInterceptor, BeanFactoryAware, InitializingBean

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public class HibernateInterceptor
extends HibernateAccessor
implements MethodInterceptor

This interceptor binds a new Hibernate Session to the thread before a method call, closing and removing it afterwards in case of any method outcome. If there already is a pre-bound Session (e.g. from HibernateTransactionManager, or from a surrounding Hibernate-intercepted method), the interceptor simply participates in it.

Application code must retrieve a Hibernate Session via the SessionFactoryUtils.getSession method, to be able to detect a thread-bound Session. It is preferable to use getSession with allowCreate=false, if the code relies on the interceptor to provide proper Session handling. Typically, the code will look like as follows:

 public void doSomeDataAccessAction() {
   Session session = SessionFactoryUtils.getSession(this.sessionFactory, false);
   try {
     ...
   }
   catch (HibernateException ex) {
     throw SessionFactoryUtils.convertHibernateAccessException(ex);
   }
 }

Note that the application must care about handling HibernateExceptions itself, preferably via delegating to the SessionFactoryUtils.convertHibernateAccessException method that converts them to exceptions that are compatible with the org.springframework.dao exception hierarchy (like HibernateTemplate does).

Unfortunately, this interceptor cannot convert checked HibernateExceptions to unchecked dao ones transparently. The intercepted method would have to declare the checked HibernateException - thus the caller would still have to catch or rethrow it, even if it will never be thrown if intercepted. Any such exception will nevertheless get converted by default.

This class can be considered a declarative alternative to HibernateTemplate's callback approach. The advantages are:

• no anonymous classes necessary for callback implementations;
• the possibility to throw any application exceptions from within data access code.

The drawbacks are:

• the dependency on interceptor configuration;
• the delegating try/catch blocks.

Note: Spring's Hibernate support in this package requires Hibernate 2.1. Dedicated Hibernate3 support can be found in a separate package: org.springframework.orm.hibernate3.

Since:

13.06.2003

Author:

Juergen Hoeller

See Also:

SessionFactoryUtils.getSession(net.sf.hibernate.SessionFactory, boolean), HibernateTransactionManager, HibernateTemplate

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Field Summary

 

Fields inherited from class org.springframework.orm.hibernate.HibernateAccessor
FLUSH_AUTO, FLUSH_COMMIT, FLUSH_EAGER, FLUSH_NEVER, logger

 

Constructor Summary
HibernateInterceptor()

 

Method Summary
protected  net.sf.hibernate.Session	getSession()           Return a Session for use by this interceptor.
Object	invoke(MethodInvocation methodInvocation)
void	setExceptionConversionEnabled(boolean exceptionConversionEnabled)           Set whether to convert any HibernateException raised to a Spring DataAccessException, compatible with the org.springframework.dao exception hierarchy.

 

Methods inherited from class org.springframework.orm.hibernate.HibernateAccessor
afterPropertiesSet, applyFlushMode, convertHibernateAccessException, convertJdbcAccessException, convertJdbcAccessException, flushIfNecessary, getEntityInterceptor, getFlushMode, getJdbcExceptionTranslator, getSessionFactory, setBeanFactory, setEntityInterceptor, setEntityInterceptorBeanName, setFlushMode, setFlushModeName, setJdbcExceptionTranslator, setSessionFactory

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

HibernateInterceptor

public HibernateInterceptor()

Method Detail

setExceptionConversionEnabled

public void setExceptionConversionEnabled(boolean exceptionConversionEnabled)

Set whether to convert any HibernateException raised to a Spring DataAccessException, compatible with the org.springframework.dao exception hierarchy.

Default is "true". Turn this flag off to let the caller receive raw exceptions as-is, without any wrapping. Note that this means that the DAO methods will have to declare the checked HibernateException, and callers will be forced to handle it.

See Also:

DataAccessException

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invoke

public Object invoke(MethodInvocation methodInvocation)
              throws Throwable

Specified by:

invoke in interface MethodInterceptor

Throws:

Throwable

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getSession

protected net.sf.hibernate.Session getSession()

Return a Session for use by this interceptor.

See Also:

SessionFactoryUtils.getSession(net.sf.hibernate.SessionFactory, boolean)

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