org.springframework.jdbc.datasource
Class DataSourceTransactionManager

java.lang.Object
  extended byorg.springframework.transaction.support.AbstractPlatformTransactionManager
      extended byorg.springframework.jdbc.datasource.DataSourceTransactionManager
All Implemented Interfaces:
InitializingBean, PlatformTransactionManager

public class DataSourceTransactionManager
extends AbstractPlatformTransactionManager
implements InitializingBean

PlatformTransactionManager implementation for a single JDBC DataSource. Binds a JDBC connection from the specified DataSource to the thread, potentially allowing for one thread connection per data source.

Application code is required to retrieve the JDBC Connection via DataSourceUtils.getConnection(DataSource) instead of J2EE's standard DataSource.getConnection(). This is recommended anyway, as it throws unchecked org.springframework.dao exceptions instead of checked SQLException. All framework classes like JdbcTemplate use this strategy implicitly. If not used with this transaction manager, the lookup strategy behaves exactly like the common one - it can thus be used in any case.

Alternatively, you can also allow application code to work with the standard J2EE lookup pattern DataSource.getConnection(), for example for legacy code that is not aware of Spring at all. In that case, define a TransactionAwareDataSourceProxy for your target DataSource, and pass that proxy DataSource to your DAOs, which will automatically participate in Spring-managed transactions through it. Note that DataSourceTransactionManager still needs to be wired with the target DataSource, driving transactions for it.

Supports custom isolation levels, and timeouts that get applied as appropriate JDBC statement query timeouts. To support the latter, application code must either use JdbcTemplate or call DataSourceUtils.applyTransactionTimeout for each created statement.

On JDBC 3.0, this transaction manager supports nested transactions via JDBC 3.0 Savepoints. The "nestedTransactionAllowed" flag defaults to true, as nested transactions work without restrictions on JDBC drivers that support Savepoints (like Oracle).

This implementation can be used instead of JtaTransactionManager in the single resource case, as it does not require the container to support JTA: typically, in combination with a locally defined JDBC DataSource like a Jakarta Commons DBCP connection pool. Switching between this local strategy and a JTA environment is just a matter of configuration, if you stick to the required connection lookup pattern. Note that JTA does not support custom isolation levels!

Since:
02.05.2003
Author:
Juergen Hoeller
See Also:
AbstractPlatformTransactionManager.setNestedTransactionAllowed(boolean), Savepoint, DataSourceUtils.getConnection(javax.sql.DataSource), DataSourceUtils.applyTransactionTimeout(java.sql.Statement, javax.sql.DataSource), DataSourceUtils.closeConnectionIfNecessary(java.sql.Connection, javax.sql.DataSource), TransactionAwareDataSourceProxy, JdbcTemplate

Field Summary
 
Fields inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager
logger, SYNCHRONIZATION_ALWAYS, SYNCHRONIZATION_NEVER, SYNCHRONIZATION_ON_ACTUAL_TRANSACTION
 
Constructor Summary
DataSourceTransactionManager()
          Create a new DataSourceTransactionManager instance.
DataSourceTransactionManager(DataSource dataSource)
          Create a new DataSourceTransactionManager instance.
 
Method Summary
 void afterPropertiesSet()
          Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
protected  void doBegin(Object transaction, TransactionDefinition definition)
          This implementation sets the isolation level but ignores the timeout.
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.
protected  boolean isExistingTransaction(Object transaction)
          Check if the given transaction object indicates an existing transaction (that is, a transaction which has already started).
 void setDataSource(DataSource dataSource)
          Set the JDBC DataSource that this instance should manage transactions for.
 
Methods inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager
commit, getTransaction, getTransactionSynchronization, isNestedTransactionAllowed, isRollbackOnCommitFailure, rollback, setNestedTransactionAllowed, setRollbackOnCommitFailure, setTransactionSynchronization, setTransactionSynchronizationName, useSavepointForNestedTransaction
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DataSourceTransactionManager

public DataSourceTransactionManager()
Create a new DataSourceTransactionManager instance. A DataSource has to be set to be able to use it.

See Also:
setDataSource(javax.sql.DataSource)

DataSourceTransactionManager

public DataSourceTransactionManager(DataSource dataSource)
Create a new DataSourceTransactionManager instance.

Parameters:
dataSource - JDBC DataSource to manage transactions for
Method Detail

setDataSource

public void setDataSource(DataSource dataSource)
Set the JDBC DataSource that this instance should manage transactions for.

This will typically be a locally defined DataSource, for example a Jakarta Commons DBCP connection pool. Alternatively, you can also drive transactions for a non-XA J2EE DataSource fetched from JNDI. For an XA DataSource, use JtaTransactionManager.

See Also:
JtaTransactionManager

getDataSource

public DataSource getDataSource()
Return the JDBC DataSource that this instance manages transactions for.


afterPropertiesSet

public void afterPropertiesSet()
Description copied from interface: InitializingBean
Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

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)
This implementation sets the isolation level but ignores the timeout.

Specified by:
doBegin in class AbstractPlatformTransactionManager
Parameters:
transaction - transaction object returned by doGetTransaction
definition - TransactionDefinition instance, describing propagation behavior, isolation level, timeout etc.

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


Copyright (C) 2003-2004 The Spring Framework Project.