org.springframework.jca.cci.connection
Class TransactionAwareConnectionFactoryProxy

java.lang.Object
  extended by org.springframework.jca.cci.connection.DelegatingConnectionFactory
      extended by org.springframework.jca.cci.connection.TransactionAwareConnectionFactoryProxy
All Implemented Interfaces:
java.io.Serializable, javax.naming.Referenceable, javax.resource.cci.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 J2EE 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 J2EE/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
TransactionAwareConnectionFactoryProxy()
          Create a new TransactionAwareConnectionFactoryProxy.
TransactionAwareConnectionFactoryProxy(javax.resource.cci.ConnectionFactory targetConnectionFactory)
          Create a new TransactionAwareConnectionFactoryProxy.
 
Method Summary
 javax.resource.cci.Connection getConnection()
          Delegate to ConnectionFactoryUtils for automatically participating in Spring-managed transactions.
protected  javax.resource.cci.Connection getTransactionAwareConnectionProxy(javax.resource.cci.Connection target, javax.resource.cci.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, 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(javax.resource.cci.ConnectionFactory targetConnectionFactory)
Create a new TransactionAwareConnectionFactoryProxy.

Parameters:
targetConnectionFactory - the target ConnectionFactory
Method Detail

getConnection

public javax.resource.cci.Connection getConnection()
                                            throws javax.resource.ResourceException
Delegate to ConnectionFactoryUtils for automatically participating in Spring-managed transactions. Throws the original ResourceException, if any.

Specified by:
getConnection in interface javax.resource.cci.ConnectionFactory
Overrides:
getConnection in class DelegatingConnectionFactory
Returns:
a transactional Connection if any, a new one else
Throws:
javax.resource.ResourceException
See Also:
ConnectionFactoryUtils.doGetConnection(javax.resource.cci.ConnectionFactory)

getTransactionAwareConnectionProxy

protected javax.resource.cci.Connection getTransactionAwareConnectionProxy(javax.resource.cci.Connection target,
                                                                           javax.resource.cci.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)