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TopLinkInterceptor (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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org.springframework.orm.toplink
Class TopLinkInterceptor

java.lang.Object
  org.springframework.orm.toplink.TopLinkAccessor
      org.springframework.orm.toplink.TopLinkInterceptor

All Implemented Interfaces:

Advice, Interceptor, MethodInterceptor, InitializingBean

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public class TopLinkInterceptor
extends TopLinkAccessor
implements MethodInterceptor

This interceptor binds a new TopLink 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 TopLinkTransactionManager, or from a surrounding TopLink-intercepted method), the interceptor simply takes part in it.

Application code must retrieve a TopLink 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 as follows:

 public void doTopLinkAction() {
   Session session = SessionFactoryUtils.getSession(this.sessionFactory, false);
   try {
     ...
   }
   catch (TopLinkException ex) {
     throw SessionFactoryUtils.convertTopLinkAccessException(ex);
   }
 }

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

This class can be considered a declarative alternative to TopLinkTemplate'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.

Since:

1.2

Author:

Juergen Hoeller

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Field Summary

 

Fields inherited from class org.springframework.orm.toplink.TopLinkAccessor
logger

 

Constructor Summary
TopLinkInterceptor()

 

Method Summary
Object	invoke(MethodInvocation methodInvocation)

 

Methods inherited from class org.springframework.orm.toplink.TopLinkAccessor
afterPropertiesSet, convertJdbcAccessException, convertTopLinkAccessException, getJdbcExceptionTranslator, getSessionFactory, setJdbcExceptionTranslator, setSessionFactory

 

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

 

Constructor Detail

TopLinkInterceptor

public TopLinkInterceptor()

Method Detail

invoke

public Object invoke(MethodInvocation methodInvocation)
              throws Throwable

Specified by:

invoke in interface MethodInterceptor

Throws:

Throwable

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