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

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org.springframework.orm.toplink.support
Class TopLinkDaoSupport

java.lang.Object
  extended by org.springframework.dao.support.DaoSupport
      extended by org.springframework.orm.toplink.support.TopLinkDaoSupport
All Implemented Interfaces:
InitializingBean
public abstract class TopLinkDaoSupport
extends DaoSupport

Convenient super class for TopLink data access objects.

Requires a SessionFactory to be set, providing a TopLinkTemplate based on it to subclasses. Can alternatively be initialized directly via a TopLinkTemplate, to reuse the latter's settings like SessionFactory, exception translator, etc.

This base class is mainly intended for TopLinkTemplate usage but can also be used when working with SessionFactoryUtils directly, e.g. in combination with TopLinkInterceptor-managed Sessions. Convenience getSession and releaseSession methods are provided for that usage style.

Since:
1.2
Author:
Juergen Hoeller
See Also:
setSessionFactory(org.springframework.orm.toplink.SessionFactory), setTopLinkTemplate(org.springframework.orm.toplink.TopLinkTemplate), getSession(), releaseSession(oracle.toplink.sessions.Session), TopLinkTemplate, TopLinkInterceptor

Field Summary
 
Fields inherited from class org.springframework.dao.support.DaoSupport
logger
 
Constructor Summary
TopLinkDaoSupport()
           
 
Method Summary
protected  void checkDaoConfig()
          Abstract subclasses must override this to check their configuration.
protected  DataAccessException convertTopLinkAccessException(oracle.toplink.exceptions.TopLinkException ex)
          Convert the given TopLinkException to an appropriate exception from the org.springframework.dao hierarchy.
protected  TopLinkTemplate createTopLinkTemplate(SessionFactory sessionFactory)
          Create a TopLinkTemplate for the given SessionFactory.
protected  oracle.toplink.sessions.Session getSession()
          Get a TopLink Session, either from the current transaction or a new one.
protected  oracle.toplink.sessions.Session getSession(boolean allowCreate)
          Get a TopLink Session, either from the current transaction or a new one.
 SessionFactory getSessionFactory()
          Return the TopLink SessionFactory used by this DAO.
 TopLinkTemplate getTopLinkTemplate()
          Return the TopLinkTemplate for this DAO, pre-initialized with the SessionFactory or set explicitly.
protected  void releaseSession(oracle.toplink.sessions.Session session)
          Close the given TopLink Session, created via this DAO's SessionFactory, if it isn't bound to the thread.
 void setSessionFactory(SessionFactory sessionFactory)
          Set the TopLink SessionFactory to be used by this DAO.
 void setTopLinkTemplate(TopLinkTemplate topLinkTemplate)
          Set the TopLinkTemplate for this DAO explicitly, as an alternative to specifying a SessionFactory.
 
Methods inherited from class org.springframework.dao.support.DaoSupport
afterPropertiesSet, initDao
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TopLinkDaoSupport

public TopLinkDaoSupport()
Method Detail

setSessionFactory

public final void setSessionFactory(SessionFactory sessionFactory)
Set the TopLink SessionFactory to be used by this DAO. Will automatically create a TopLinkTemplate for the given SessionFactory.

See Also:
createTopLinkTemplate(org.springframework.orm.toplink.SessionFactory), setTopLinkTemplate(org.springframework.orm.toplink.TopLinkTemplate)

createTopLinkTemplate

protected TopLinkTemplate createTopLinkTemplate(SessionFactory sessionFactory)
Create a TopLinkTemplate for the given SessionFactory. Only invoked if populating the DAO with a SessionFactory reference!

Can be overridden in subclasses to provide a TopLinkTemplate instance with different configuration, or a custom TopLinkTemplate subclass.

Parameters:
sessionFactory - the TopLink SessionFactory to create a TopLinkTemplate for
Returns:
the new TopLinkTemplate instance
See Also:
setSessionFactory(org.springframework.orm.toplink.SessionFactory)

getSessionFactory

public final SessionFactory getSessionFactory()
Return the TopLink SessionFactory used by this DAO.

setTopLinkTemplate

public final void setTopLinkTemplate(TopLinkTemplate topLinkTemplate)
Set the TopLinkTemplate for this DAO explicitly, as an alternative to specifying a SessionFactory.

See Also:
setSessionFactory(org.springframework.orm.toplink.SessionFactory)

getTopLinkTemplate

public final TopLinkTemplate getTopLinkTemplate()
Return the TopLinkTemplate for this DAO, pre-initialized with the SessionFactory or set explicitly.

checkDaoConfig

protected final void checkDaoConfig()
Description copied from class: DaoSupport
Abstract subclasses must override this to check their configuration.

Implementors should be marked as final, to make it clear that concrete subclasses are not supposed to override this template method themselves.

Specified by:
checkDaoConfig in class DaoSupport

getSession

protected final oracle.toplink.sessions.Session getSession()
                                                    throws DataAccessResourceFailureException,
                                                           IllegalStateException
Get a TopLink Session, either from the current transaction or a new one. The latter is only allowed if the "allowCreate" setting of this bean's TopLinkTemplate is true.

Note that this is not meant to be invoked from TopLinkTemplate code but rather just in plain TopLink code. Either rely on a thread-bound Session (via TopLinkInterceptor), or use it in combination with releaseSession.

In general, it is recommended to use TopLinkTemplate, either with the provided convenience operations or with a custom TopLinkCallback that provides you with a Session to work on. TopLinkTemplate will care for all resource management and for proper exception conversion.

Returns:
the TopLink Session
Throws:
DataAccessResourceFailureException - if the Session couldn't be created
IllegalStateException - if no thread-bound Session found and allowCreate false
See Also:
TopLinkTemplate, SessionFactoryUtils.getSession(SessionFactory, boolean), TopLinkInterceptor, TopLinkTemplate, TopLinkCallback

getSession

protected final oracle.toplink.sessions.Session getSession(boolean allowCreate)
                                                    throws DataAccessResourceFailureException,
                                                           IllegalStateException
Get a TopLink Session, either from the current transaction or a new one. The latter is only allowed if "allowCreate" is true.

Note that this is not meant to be invoked from TopLinkTemplate code but rather just in plain TopLink code. Either rely on a thread-bound Session (via TopLinkInterceptor), or use it in combination with releaseSession.

In general, it is recommended to use TopLinkTemplate, either with the provided convenience operations or with a custom TopLinkCallback that provides you with a Session to work on. TopLinkTemplate will care for all resource management and for proper exception conversion.

Parameters:
allowCreate - if a new Session should be created if no thread-bound found
Returns:
the TopLink Session
Throws:
DataAccessResourceFailureException - if the Session couldn't be created
IllegalStateException - if no thread-bound Session found and allowCreate false
See Also:
SessionFactoryUtils.getSession(SessionFactory, boolean), TopLinkInterceptor, TopLinkTemplate, TopLinkCallback

convertTopLinkAccessException

protected final DataAccessException convertTopLinkAccessException(oracle.toplink.exceptions.TopLinkException ex)
Convert the given TopLinkException to an appropriate exception from the org.springframework.dao hierarchy. Will automatically detect wrapped SQLExceptions and convert them accordingly.

Delegates to the convertTopLinkAccessException method of this DAO's TopLinkTemplate.

Parameters:
ex - TopLinkException that occured
Returns:
the corresponding DataAccessException instance
See Also:
setTopLinkTemplate(org.springframework.orm.toplink.TopLinkTemplate), TopLinkAccessor.convertTopLinkAccessException(oracle.toplink.exceptions.TopLinkException)

releaseSession

protected final void releaseSession(oracle.toplink.sessions.Session session)
Close the given TopLink Session, created via this DAO's SessionFactory, if it isn't bound to the thread.

Parameters:
session - the TopLink Session to close
See Also:
SessionFactoryUtils.releaseSession(oracle.toplink.sessions.Session, org.springframework.orm.toplink.SessionFactory)
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