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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.orm.jdo 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


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

All known Subclasses:   org.springframework.orm.jdo.JdoTemplate,  org.springframework.orm.jdo.JdoInterceptor,
JdoAccessor
abstract public class JdoAccessor implements InitializingBean(Code)
Base class for JdoTemplate and JdoInterceptor, defining common properties such as PersistenceManagerFactory and flushing behavior.

Note: With JDO, modifications to persistent objects are just possible within a transaction (in contrast to Hibernate). Therefore, eager flushing will just get applied when in a transaction. Furthermore, there is no explicit notion of flushing never, as this would not imply a performance gain due to JDO's field interception mechanism (which doesn't involve the overhead of snapshot comparisons).

Eager flushing is just available for specific JDO providers. You need to a corresponding JdoDialect to make eager flushing work.

Not intended to be used directly. See JdoTemplate and JdoInterceptor.
author:
   Juergen Hoeller
since:
   02.11.2003
See Also:   JdoTemplate
See Also:   JdoInterceptor
See Also:   JdoAccessor.setFlushEager



Field Summary
final protected  Loglogger
    


Method Summary
public  voidafterPropertiesSet()
     Eagerly initialize the JDO dialect, creating a default one for the specified PersistenceManagerFactory if none set.
public  DataAccessExceptionconvertJdoAccessException(JDOException ex)
     Convert the given JDOException to an appropriate exception from the org.springframework.dao hierarchy.
protected  voidflushIfNecessary(PersistenceManager pm, boolean existingTransaction)
     Flush the given JDO persistence manager if necessary.
public  JdoDialectgetJdoDialect()
     Return the JDO dialect to use for this accessor.
public  PersistenceManagerFactorygetPersistenceManagerFactory()
     Return the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.
public  booleanisFlushEager()
     Return if this accessor should flush changes to the database eagerly.
public  voidsetFlushEager(boolean flushEager)
     Set if this accessor should flush changes to the database eagerly.

Eager flushing leads to immediate synchronization with the database, even if in a transaction.

public  voidsetJdoDialect(JdoDialect jdoDialect)
     Set the JDO dialect to use for this accessor.
public  voidsetPersistenceManagerFactory(PersistenceManagerFactory pmf)
     Set the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.

Field Detail
logger
final protected Log logger(Code)
Logger available to subclasses





Method Detail
afterPropertiesSet
public void afterPropertiesSet()(Code)
Eagerly initialize the JDO dialect, creating a default one for the specified PersistenceManagerFactory if none set.



convertJdoAccessException
public DataAccessException convertJdoAccessException(JDOException ex)(Code)
Convert the given JDOException to an appropriate exception from the org.springframework.dao hierarchy.

Default implementation delegates to the JdoDialect. May be overridden in subclasses.
Parameters:
  ex - JDOException that occured the corresponding DataAccessException instance
See Also:   JdoDialect.translateException




flushIfNecessary
protected void flushIfNecessary(PersistenceManager pm, boolean existingTransaction) throws JDOException(Code)
Flush the given JDO persistence manager if necessary.
Parameters:
  pm - the current JDO PersistenceManager
Parameters:
  existingTransaction - if executing within an existing transaction(within an existing JDO PersistenceManager that won't be closed immediately)
throws:
  JDOException - in case of JDO flushing errors



getJdoDialect
public JdoDialect getJdoDialect()(Code)
Return the JDO dialect to use for this accessor.

Creates a default one for the specified PersistenceManagerFactory if none set.




getPersistenceManagerFactory
public PersistenceManagerFactory getPersistenceManagerFactory()(Code)
Return the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.



isFlushEager
public boolean isFlushEager()(Code)
Return if this accessor should flush changes to the database eagerly.



setFlushEager
public void setFlushEager(boolean flushEager)(Code)
Set if this accessor should flush changes to the database eagerly.

Eager flushing leads to immediate synchronization with the database, even if in a transaction. This causes inconsistencies to show up and throw a respective exception immediately, and JDBC access code that participates in the same transaction will see the changes as the database is already aware of them then. But the drawbacks are:

  • additional communication roundtrips with the database, instead of a single batch at transaction commit;
  • the fact that an actual database rollback is needed if the JDO transaction rolls back (due to already submitted SQL statements).



setJdoDialect
public void setJdoDialect(JdoDialect jdoDialect)(Code)
Set the JDO dialect to use for this accessor.

The dialect object can be used to retrieve the underlying JDBC connection and to eagerly flush changes to the database.

Default is a DefaultJdoDialect based on the PersistenceManagerFactory's underlying DataSource, if any.




setPersistenceManagerFactory
public void setPersistenceManagerFactory(PersistenceManagerFactory pmf)(Code)
Set the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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