org.springframework.orm.jdo
Class JdoInterceptor

java.lang.Object
  org.springframework.orm.jdo.JdoAccessor
      org.springframework.orm.jdo.JdoInterceptor

All Implemented Interfaces:

Advice, Interceptor, MethodInterceptor, InitializingBean

public class JdoInterceptor
extends JdoAccessor
implements MethodInterceptor

This interceptor binds a new JDO PersistenceManager 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 PersistenceManager (e.g. from JdoTransactionManager, or from a surrounding JDO-intercepted method), the interceptor simply participates in it.

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

 public void doSomeDataAccessAction() {
   PersistenceManager pm = PersistenceManagerFactoryUtils.getPersistenceManager(this.pmf, false);
   ...
 }

Note that this interceptor automatically translates JDOExceptions, via delegating to the PersistenceManagerFactoryUtils.convertJdoAccessException method that converts them to exceptions that are compatible with the org.springframework.dao exception hierarchy (like JdoTemplate does). This can be turned off if the raw exceptions are preferred.

This class can be considered a declarative alternative to JdoTemplate'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 drawback is the dependency on interceptor configuration. However, note that this interceptor is usually not necessary in scenarios where the data access code always executes within transactions. A transaction will always have a thread-bound PersistenceManager in the first place, so adding this interceptor to the configuration just adds value when fine-tuning PersistenceManager settings like the flush mode - or when relying on exception translation.

Since:

13.06.2003

Author:

Juergen Hoeller

See Also:

PersistenceManagerFactoryUtils.getPersistenceManager(javax.jdo.PersistenceManagerFactory, boolean), JdoTransactionManager, JdoTemplate

Field Summary

Fields inherited from class org.springframework.orm.jdo.JdoAccessor

logger

Constructor Summary

JdoInterceptor()

Method Summary

Object	invoke(MethodInvocation methodInvocation)
void	setExceptionConversionEnabled(boolean exceptionConversionEnabled) Set whether to convert any JDOException raised to a Spring DataAccessException, compatible with the org.springframework.dao exception hierarchy.

Methods inherited from class org.springframework.orm.jdo.JdoAccessor

afterPropertiesSet, convertJdoAccessException, flushIfNecessary, getJdoDialect, getPersistenceManagerFactory, isFlushEager, setFlushEager, setJdoDialect, setPersistenceManagerFactory

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JdoInterceptor

public JdoInterceptor()

Method Detail

setExceptionConversionEnabled

public void setExceptionConversionEnabled(boolean exceptionConversionEnabled)

Set whether to convert any JDOException 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.

See Also:

DataAccessException

invoke

public Object invoke(MethodInvocation methodInvocation)
              throws Throwable

Specified by:

invoke in interface MethodInterceptor

Throws:

Throwable