org.springframework.orm.jdo
Class JdoTransactionManager

java.lang.Object
  org.springframework.transaction.support.AbstractPlatformTransactionManager
      org.springframework.orm.jdo.JdoTransactionManager

All Implemented Interfaces:

Serializable, InitializingBean, PlatformTransactionManager

public class JdoTransactionManager
extends AbstractPlatformTransactionManager
implements InitializingBean

PlatformTransactionManager implementation for a single JDO PersistenceManagerFactory. Binds a JDO PersistenceManager from the specified factory to the thread, potentially allowing for one thread PersistenceManager per factory. PersistenceManagerFactoryUtils and JdoTemplate are aware of thread-bound persistence managers and participate in such transactions automatically. Using either of those or going through a TransactionAwarePersistenceManagerFactoryProxy is required for JDO access code supporting this transaction management mechanism.

This implementation is appropriate for applications that solely use JDO for transactional data access. JTA (usually through JtaTransactionManager) is necessary for accessing multiple transactional resources. Note that you need to configure your JDO provider accordingly to make it participate in JTA transactions.

With a JdoDialect specified, this implementation also supports direct DataSource access within a transaction (i.e. plain JDBC code working with the same DataSource). This allows for mixing services that access JDO (including transactional caching) and services that use plain JDBC (without being aware of JDO)! Application code needs to stick to the same simple Connection lookup pattern as with DataSourceTransactionManager (i.e. DataSourceUtils.getConnection or going through a TransactionAwareDataSourceProxy).

Note that to be able to register a DataSource's Connection for plain JDBC code, this instance needs to be aware of the DataSource (see "dataSource" property). The given DataSource should obviously match the one used by the given PersistenceManagerFactory. This transaction manager will autodetect the DataSource that acts as "connectionFactory" of the PersistenceManagerFactory, so you usually don't need to explicitly specify the "dataSource" property.

On JDBC 3.0, this transaction manager supports nested transactions via JDBC 3.0 Savepoints. The "nestedTransactionAllowed" flag defaults to "false", though, as nested transactions will just apply to the JDBC Connection, not to the JDO PersistenceManager and its cached objects. You can manually set the flag to "true" if you want to use nested transactions for JDBC access code that participates in JDO transactions (provided that your JDBC driver supports Savepoints). Note that JDO itself does not support nested transactions! Hence, do not expect JDO access code to participate in a nested transaction.

Since:

03.06.2003

Author:

Juergen Hoeller

See Also:

setPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory), setDataSource(javax.sql.DataSource), PersistenceManagerFactory.getConnectionFactory(), LocalPersistenceManagerFactoryBean, PersistenceManagerFactoryUtils.getPersistenceManager(javax.jdo.PersistenceManagerFactory, boolean), PersistenceManagerFactoryUtils.releasePersistenceManager(javax.jdo.PersistenceManager, javax.jdo.PersistenceManagerFactory), JdoTemplate, TransactionAwarePersistenceManagerFactoryProxy, DataSourceUtils.getConnection(javax.sql.DataSource), DataSourceUtils.releaseConnection(java.sql.Connection, javax.sql.DataSource), JdbcTemplate, DataSourceTransactionManager, JtaTransactionManager, Serialized Form

Field Summary

Fields inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager

logger, SYNCHRONIZATION_ALWAYS, SYNCHRONIZATION_NEVER, SYNCHRONIZATION_ON_ACTUAL_TRANSACTION

Constructor Summary

JdoTransactionManager()
Create a new JdoTransactionManager instance.

JdoTransactionManager(javax.jdo.PersistenceManagerFactory pmf)
Create a new JdoTransactionManager instance.

Method Summary

void	afterPropertiesSet() Eagerly initialize the JDO dialect, creating a default one for the specified PersistenceManagerFactory if none set.
protected DataAccessException	convertJdoAccessException(javax.jdo.JDOException ex) Convert the given JDOException to an appropriate exception from the org.springframework.dao hierarchy.
protected void	doBegin(Object transaction, TransactionDefinition definition) Begin a new transaction with semantics according to the given transaction definition.
protected void	doCleanupAfterCompletion(Object transaction) Cleanup resources after transaction completion.
protected void	doCommit(DefaultTransactionStatus status) Perform an actual commit of the given transaction.
protected Object	doGetTransaction() Return a transaction object for the current transaction state.
protected void	doResume(Object transaction, Object suspendedResources) Resume the resources of the current transaction.
protected void	doRollback(DefaultTransactionStatus status) Perform an actual rollback of the given transaction.
protected void	doSetRollbackOnly(DefaultTransactionStatus status) Set the given transaction rollback-only.
protected Object	doSuspend(Object transaction) Suspend the resources of the current transaction.
DataSource	getDataSource() Return the JDBC DataSource that this instance manages transactions for.
JdoDialect	getJdoDialect() Return the JDO dialect to use for this transaction manager.
javax.jdo.PersistenceManagerFactory	getPersistenceManagerFactory() Return the PersistenceManagerFactory that this instance should manage transactions for.
protected boolean	isExistingTransaction(Object transaction) Check if the given transaction object indicates an existing transaction (that is, a transaction which has already started).
void	setAutodetectDataSource(boolean autodetectDataSource) Set whether to autodetect a JDBC DataSource used by the JDO PersistenceManagerFactory, as returned by the getConnectionFactory() method.
void	setDataSource(DataSource dataSource) Set the JDBC DataSource that this instance should manage transactions for.
void	setJdoDialect(JdoDialect jdoDialect) Set the JDO dialect to use for this transaction manager.
void	setPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory pmf) Set the PersistenceManagerFactory that this instance should manage transactions for.

Methods inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager

commit, getTransaction, getTransactionSynchronization, invokeAfterCompletion, isGlobalRollbackOnParticipationFailure, isNestedTransactionAllowed, isRollbackOnCommitFailure, registerAfterCompletionWithExistingTransaction, rollback, setGlobalRollbackOnParticipationFailure, setNestedTransactionAllowed, setRollbackOnCommitFailure, setTransactionSynchronization, setTransactionSynchronizationName, shouldCommitOnGlobalRollbackOnly, useSavepointForNestedTransaction

Methods inherited from class java.lang.Object

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

Constructor Detail

JdoTransactionManager

public JdoTransactionManager()

Create a new JdoTransactionManager instance. A PersistenceManagerFactory has to be set to be able to use it.

See Also:

setPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory)

JdoTransactionManager

public JdoTransactionManager(javax.jdo.PersistenceManagerFactory pmf)

Create a new JdoTransactionManager instance.

Parameters:

pmf - PersistenceManagerFactory to manage transactions for

Method Detail

setPersistenceManagerFactory

public void setPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory pmf)

Set the PersistenceManagerFactory that this instance should manage transactions for.

The PersistenceManagerFactory specified here should be the target PersistenceManagerFactory to manage transactions for, not a TransactionAwarePersistenceManagerFactoryProxy. Only data access code may work with TransactionAwarePersistenceManagerFactoryProxy, while the transaction manager needs to work on the underlying target PersistenceManagerFactory.

See Also:

TransactionAwarePersistenceManagerFactoryProxy

getPersistenceManagerFactory

public javax.jdo.PersistenceManagerFactory getPersistenceManagerFactory()

Return the PersistenceManagerFactory that this instance should manage transactions for.

setDataSource

public void setDataSource(DataSource dataSource)

Set the JDBC DataSource that this instance should manage transactions for. The DataSource should match the one used by the JDO PersistenceManagerFactory: for example, you could specify the same JNDI DataSource for both.

If the PersistenceManagerFactory uses a DataSource as connection factory, the DataSource will be autodetected: You can still explictly specify the DataSource, but you don't need to in this case.

A transactional JDBC Connection for this DataSource will be provided to application code accessing this DataSource directly via DataSourceUtils or JdbcTemplate. The Connection will be taken from the JDO PersistenceManager.

Note that you need to use a JDO dialect for a specific JDO provider to allow for exposing JDO transactions as JDBC transactions.

The DataSource specified here should be the target DataSource to manage transactions for, not a TransactionAwareDataSourceProxy. Only data access code may work with TransactionAwareDataSourceProxy, while the transaction manager needs to work on the underlying target DataSource. If there's nevertheless a TransactionAwareDataSourceProxy passed in, it will be unwrapped to extract its target DataSource.

See Also:

setAutodetectDataSource(boolean), setJdoDialect(org.springframework.orm.jdo.JdoDialect), PersistenceManagerFactory.getConnectionFactory(), TransactionAwareDataSourceProxy, DataSourceUtils, JdbcTemplate

getDataSource

public DataSource getDataSource()

Return the JDBC DataSource that this instance manages transactions for.

setAutodetectDataSource

public void setAutodetectDataSource(boolean autodetectDataSource)

Set whether to autodetect a JDBC DataSource used by the JDO PersistenceManagerFactory, as returned by the getConnectionFactory() method. Default is "true".

Can be turned off to deliberately ignore an available DataSource, to not expose JDO transactions as JDBC transactions for that DataSource.

See Also:

setDataSource(javax.sql.DataSource), PersistenceManagerFactory.getConnectionFactory()

setJdoDialect

public void setJdoDialect(JdoDialect jdoDialect)

Set the JDO dialect to use for this transaction manager.

The dialect object can be used to retrieve the underlying JDBC connection and thus allows for exposing JDO transactions as JDBC transactions.

See Also:

JdoDialect.getJdbcConnection(javax.jdo.PersistenceManager, boolean)

getJdoDialect

public JdoDialect getJdoDialect()

Return the JDO dialect to use for this transaction manager. Creates a default one for the specified PersistenceManagerFactory if none set.

afterPropertiesSet

public void afterPropertiesSet()

Eagerly initialize the JDO dialect, creating a default one for the specified PersistenceManagerFactory if none set. Auto-detect the PersistenceManagerFactory's DataSource, if any.

Specified by:

afterPropertiesSet in interface InitializingBean

doGetTransaction

protected Object doGetTransaction()

Description copied from class: AbstractPlatformTransactionManager

Return a transaction object for the current transaction state.

The returned object will usually be specific to the concrete transaction manager implementation, carrying corresponding transaction state in a modifiable fashion. This object will be passed into the other template methods (e.g. doBegin and doCommit), either directly or as part of a DefaultTransactionStatus instance.

The returned object should contain information about any existing transaction, that is, a transaction that has already started before the current getTransaction call on the transaction manager. Consequently, a doGetTransaction implementation will usually look for an existing transaction and store corresponding state in the returned transaction object.

Specified by:

doGetTransaction in class AbstractPlatformTransactionManager

Returns:

the current transaction object

See Also:

AbstractPlatformTransactionManager.doBegin(java.lang.Object, org.springframework.transaction.TransactionDefinition), AbstractPlatformTransactionManager.doCommit(org.springframework.transaction.support.DefaultTransactionStatus), AbstractPlatformTransactionManager.doRollback(org.springframework.transaction.support.DefaultTransactionStatus), DefaultTransactionStatus.getTransaction()

isExistingTransaction

protected boolean isExistingTransaction(Object transaction)

Description copied from class: AbstractPlatformTransactionManager

Check if the given transaction object indicates an existing transaction (that is, a transaction which has already started).

The result will be evaluated according to the specified propagation behavior for the new transaction. An existing transaction might get suspended (in case of PROPAGATION_REQUIRES_NEW), or the new transaction might participate in the existing one (in case of PROPAGATION_REQUIRED).

Default implementation returns false, assuming that detection of or participating in existing transactions is generally not supported. Subclasses are of course encouraged to provide such support.

Overrides:

isExistingTransaction in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

Returns:

if there is an existing transaction

See Also:

AbstractPlatformTransactionManager.doGetTransaction()

doBegin

protected void doBegin(Object transaction,
                       TransactionDefinition definition)

Description copied from class: AbstractPlatformTransactionManager

Begin a new transaction with semantics according to the given transaction definition. Does not have to care about applying the propagation behavior, as this has already been handled by this abstract manager.

This method gets called when the transaction manager has decided to actually start a new transaction. Either there wasn't any transaction before, or the previous transaction has been suspended.

A special scenario is a nested transaction without savepoint: If useSavepointForNestedTransaction() returns "false", this method will be called to start a nested transaction when necessary. In such a context, there will be an active transaction: The implementation of this method has to detect this and start an appropriate nested transaction.

Specified by:

doBegin in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

definition - TransactionDefinition instance, describing propagation behavior, isolation level, read-only flag, timeout, and transaction name

doSuspend

protected Object doSuspend(Object transaction)

Description copied from class: AbstractPlatformTransactionManager

Suspend the resources of the current transaction. Transaction synchronization will already have been suspended.

Default implementation throws a TransactionSuspensionNotSupportedException, assuming that transaction suspension is generally not supported.

Overrides:

doSuspend in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

Returns:

an object that holds suspended resources (will be kept unexamined for passing it into doResume)

See Also:

AbstractPlatformTransactionManager.doResume(java.lang.Object, java.lang.Object)

doResume

protected void doResume(Object transaction,
                        Object suspendedResources)

Description copied from class: AbstractPlatformTransactionManager

Resume the resources of the current transaction. Transaction synchronization will be resumed afterwards.

Default implementation throws a TransactionSuspensionNotSupportedException, assuming that transaction suspension is generally not supported.

Overrides:

doResume in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

suspendedResources - the object that holds suspended resources, as returned by doSuspend

See Also:

AbstractPlatformTransactionManager.doSuspend(java.lang.Object)

doCommit

protected void doCommit(DefaultTransactionStatus status)

Description copied from class: AbstractPlatformTransactionManager

Perform an actual commit of the given transaction.

An implementation does not need to check the "new transaction" flag or the rollback-only flag; this will already have been handled before. Usually, a straight commit will be performed on the transaction object contained in the passed-in status.

Specified by:

doCommit in class AbstractPlatformTransactionManager

Parameters:

status - the status representation of the transaction

See Also:

DefaultTransactionStatus.getTransaction()

doRollback

protected void doRollback(DefaultTransactionStatus status)

Description copied from class: AbstractPlatformTransactionManager

Perform an actual rollback of the given transaction.

An implementation does not need to check the "new transaction" flag; this will already have been handled before. Usually, a straight rollback will be performed on the transaction object contained in the passed-in status.

Specified by:

doRollback in class AbstractPlatformTransactionManager

Parameters:

status - the status representation of the transaction

See Also:

DefaultTransactionStatus.getTransaction()

doSetRollbackOnly

protected void doSetRollbackOnly(DefaultTransactionStatus status)

Description copied from class: AbstractPlatformTransactionManager

Set the given transaction rollback-only. Only called on rollback if the current transaction participates in an existing one.

Default implementation throws an IllegalTransactionStateException, assuming that participating in existing transactions is generally not supported. Subclasses are of course encouraged to provide such support.

Overrides:

doSetRollbackOnly in class AbstractPlatformTransactionManager

Parameters:

status - the status representation of the transaction

doCleanupAfterCompletion

protected void doCleanupAfterCompletion(Object transaction)

Description copied from class: AbstractPlatformTransactionManager

Cleanup resources after transaction completion. Called after doCommit and doRollback execution, on any outcome. Default implementation does nothing.

Should not throw any exceptions but just issue warnings on errors.

Overrides:

doCleanupAfterCompletion in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

convertJdoAccessException

protected DataAccessException convertJdoAccessException(javax.jdo.JDOException ex)

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

Returns:

the corresponding DataAccessException instance

See Also:

JdoDialect.translateException(javax.jdo.JDOException)