org.springframework.jca.cci.connection

Class TransactionAwareConnectionFactoryProxy

java.lang.Object

org.springframework.jca.cci.connection.DelegatingConnectionFactory

org.springframework.jca.cci.connection.TransactionAwareConnectionFactoryProxy

All Implemented Interfaces:

java.io.Serializable, javax.naming.Referenceable, ConnectionFactory, InitializingBean

public class TransactionAwareConnectionFactoryProxy
extends DelegatingConnectionFactory

Proxy for a target CCI ConnectionFactory, adding awareness of Spring-managed transactions. Similar to a transactional JNDI ConnectionFactory as provided by a Java EE server.

Data access code that should remain unaware of Spring's data access support can work with this proxy to seamlessly participate in Spring-managed transactions. Note that the transaction manager, for example the CciLocalTransactionManager, still needs to work with underlying ConnectionFactory, not with this proxy.

Make sure that TransactionAwareConnectionFactoryProxy is the outermost ConnectionFactory of a chain of ConnectionFactory proxies/adapters. TransactionAwareConnectionFactoryProxy can delegate either directly to the target connection pool or to some intermediate proxy/adapter like ConnectionSpecConnectionFactoryAdapter.

Delegates to ConnectionFactoryUtils for automatically participating in thread-bound transactions, for example managed by CciLocalTransactionManager. getConnection calls and close calls on returned Connections will behave properly within a transaction, i.e. always operate on the transactional Connection. If not within a transaction, normal ConnectionFactory behavior applies.

This proxy allows data access code to work with the plain JCA CCI API and still participate in Spring-managed transactions, similar to CCI code in a Java EE/JTA environment. However, if possible, use Spring's ConnectionFactoryUtils, CciTemplate or CCI operation objects to get transaction participation even without a proxy for the target ConnectionFactory, avoiding the need to define such a proxy in the first place.

NOTE: This ConnectionFactory proxy needs to return wrapped Connections in order to handle close calls properly. Therefore, the returned Connections cannot be cast to a native CCI Connection type or to a connection pool implementation type.

Since:

1.2

Author:

Juergen Hoeller

See Also:

ConnectionFactory.getConnection(), Connection.close(), ConnectionFactoryUtils.doGetConnection(javax.resource.cci.ConnectionFactory), ConnectionFactoryUtils.doReleaseConnection(javax.resource.cci.Connection, javax.resource.cci.ConnectionFactory), Serialized Form

Constructor Summary

Constructors

Constructor and Description
TransactionAwareConnectionFactoryProxy() Create a new TransactionAwareConnectionFactoryProxy.
TransactionAwareConnectionFactoryProxy(ConnectionFactory targetConnectionFactory) Create a new TransactionAwareConnectionFactoryProxy.

Method Summary

Modifier and Type	Method and Description
Connection	getConnection() Delegate to ConnectionFactoryUtils for automatically participating in Spring-managed transactions.
protected Connection	getTransactionAwareConnectionProxy(Connection target, ConnectionFactory cf) Wrap the given Connection with a proxy that delegates every method call to it but delegates close calls to ConnectionFactoryUtils.

Methods inherited from class org.springframework.jca.cci.connection.DelegatingConnectionFactory

afterPropertiesSet, getConnection, getMetaData, getRecordFactory, getReference, getTargetConnectionFactory, obtainTargetConnectionFactory, setReference, setTargetConnectionFactory

Methods inherited from class java.lang.Object

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

Constructor Detail

TransactionAwareConnectionFactoryProxy

public TransactionAwareConnectionFactoryProxy()

Create a new TransactionAwareConnectionFactoryProxy.

See Also:

DelegatingConnectionFactory.setTargetConnectionFactory(javax.resource.cci.ConnectionFactory)

TransactionAwareConnectionFactoryProxy

public TransactionAwareConnectionFactoryProxy(ConnectionFactory targetConnectionFactory)

Create a new TransactionAwareConnectionFactoryProxy.

Parameters:

targetConnectionFactory - the target ConnectionFactory

Method Detail

getConnection

public Connection getConnection()
                         throws ResourceException

Delegate to ConnectionFactoryUtils for automatically participating in Spring-managed transactions. Throws the original ResourceException, if any.

Specified by:

getConnection in interface ConnectionFactory

Overrides:

getConnection in class DelegatingConnectionFactory

Returns:

a transactional Connection if any, a new one else

Throws:

ResourceException

See Also:

ConnectionFactoryUtils.doGetConnection(javax.resource.cci.ConnectionFactory)

getTransactionAwareConnectionProxy

protected Connection getTransactionAwareConnectionProxy(Connection target,
                                                        ConnectionFactory cf)

Wrap the given Connection with a proxy that delegates every method call to it but delegates close calls to ConnectionFactoryUtils.

Parameters:

target - the original Connection to wrap

cf - ConnectionFactory that the Connection came from

Returns:

the wrapped Connection

See Also:

Connection.close(), ConnectionFactoryUtils.doReleaseConnection(javax.resource.cci.Connection, javax.resource.cci.ConnectionFactory)