org.springframework.jms.connection

## Class TransactionAwareConnectionFactoryProxy

- java.lang.Object
- - org.springframework.jms.connection.TransactionAwareConnectionFactoryProxy

All Implemented Interfaces:
  ConnectionFactory, QueueConnectionFactory, TopicConnectionFactory

    public class TransactionAwareConnectionFactoryProxy
    extends Object
    implements ConnectionFactory, QueueConnectionFactory, TopicConnectionFactory

Proxy for a target JMS `ConnectionFactory`, adding awareness of Spring-managed transactions. Similar to a transactional JNDI ConnectionFactory as provided by a J2EE server.

Messaging code which should remain unaware of Spring's JMS support can work with this proxy to seamlessly participate in Spring-managed transactions. Note that the transaction manager, for example `JmsTransactionManager`, still needs to work with the 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 factory or to some intermediary adapter like `UserCredentialsConnectionFactoryAdapter`.

Delegates to `ConnectionFactoryUtils` for automatically participating in thread-bound transactions, for example managed by `JmsTransactionManager`. `createSession` calls and `close` calls on returned Sessions will behave properly within a transaction, that is, always work on the transactional Session. If not within a transaction, normal ConnectionFactory behavior applies.

Note that transactional JMS Sessions will be registered on a per-Connection basis. To share the same JMS Session across a transaction, make sure that you operate on the same JMS Connection handle - either through reusing the handle or through configuring a `SingleConnectionFactory` underneath.

Returned transactional Session proxies will implement the `SessionProxy` interface to allow for access to the underlying target Session. This is only intended for accessing vendor-specific Session API or for testing purposes (e.g. to perform manual transaction control). For typical application purposes, simply use the standard JMS Session interface.

Since:
  2.0
Author:
  Juergen Hoeller
See Also:
  `UserCredentialsConnectionFactoryAdapter`, `SingleConnectionFactory`

### Constructor Summary

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

### Method Summary

Methods
`Connection` `createConnection()`
`Connection` `createConnection(String username, String password)`
`QueueConnection` `createQueueConnection()`
`QueueConnection` `createQueueConnection(String username, String password)`
`TopicConnection` `createTopicConnection()`
`TopicConnection` `createTopicConnection(String username, String password)`
`protected ConnectionFactory` `getTargetConnectionFactory()` Return the target ConnectionFactory that this ConnectionFactory should delegate to.
`protected Connection` `getTransactionAwareConnectionProxy(Connection target)` Wrap the given Connection with a proxy that delegates every method call to it but handles Session lookup in a transaction-aware fashion.
`protected boolean` `isSynchedLocalTransactionAllowed()` Return whether to allow for a local JMS transaction that is synchronized with a Spring-managed transaction.
`void` `setSynchedLocalTransactionAllowed(boolean synchedLocalTransactionAllowed)` Set whether to allow for a local JMS transaction that is synchronized with a Spring-managed transaction (where the main transaction might be a JDBC-based one for a specific DataSource, for example), with the JMS transaction committing right after the main transaction.
`void` `setTargetConnectionFactory(ConnectionFactory targetConnectionFactory)` Set the target ConnectionFactory that this ConnectionFactory should delegate to.

### 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.

#### TransactionAwareConnectionFactoryProxy

    public TransactionAwareConnectionFactoryProxy(ConnectionFactory targetConnectionFactory)

Create a new TransactionAwareConnectionFactoryProxy.

Parameters:
  `targetConnectionFactory` - the target ConnectionFactory

### Method Detail

#### setTargetConnectionFactory

    public final void setTargetConnectionFactory(ConnectionFactory targetConnectionFactory)

Set the target ConnectionFactory that this ConnectionFactory should delegate to.

#### getTargetConnectionFactory

    protected ConnectionFactory getTargetConnectionFactory()

Return the target ConnectionFactory that this ConnectionFactory should delegate to.

#### setSynchedLocalTransactionAllowed

    public void setSynchedLocalTransactionAllowed(boolean synchedLocalTransactionAllowed)

Set whether to allow for a local JMS transaction that is synchronized with a Spring-managed transaction (where the main transaction might be a JDBC-based one for a specific DataSource, for example), with the JMS transaction committing right after the main transaction. If not allowed, the given ConnectionFactory needs to handle transaction enlistment underneath the covers.

Default is "false": If not within a managed transaction that encompasses the underlying JMS ConnectionFactory, standard Sessions will be returned. Turn this flag on to allow participation in any Spring-managed transaction, with a local JMS transaction synchronized with the main transaction.

#### isSynchedLocalTransactionAllowed

    protected boolean isSynchedLocalTransactionAllowed()

Return whether to allow for a local JMS transaction that is synchronized with a Spring-managed transaction.

#### createConnection

    public Connection createConnection()
                                throws JMSException

Specified by:
  `createConnection` in interface `ConnectionFactory`
Throws:
  `JMSException`

#### createConnection

    public Connection createConnection(String username,
                              String password)
                                throws JMSException

Specified by:
  `createConnection` in interface `ConnectionFactory`
Throws:
  `JMSException`

#### createQueueConnection

    public QueueConnection createQueueConnection()
                                          throws JMSException

Specified by:
  `createQueueConnection` in interface `QueueConnectionFactory`
Throws:
  `JMSException`

#### createQueueConnection

    public QueueConnection createQueueConnection(String username,
                                        String password)
                                          throws JMSException

Specified by:
  `createQueueConnection` in interface `QueueConnectionFactory`
Throws:
  `JMSException`

#### createTopicConnection

    public TopicConnection createTopicConnection()
                                          throws JMSException

Specified by:
  `createTopicConnection` in interface `TopicConnectionFactory`
Throws:
  `JMSException`

#### createTopicConnection

    public TopicConnection createTopicConnection(String username,
                                        String password)
                                          throws JMSException

Specified by:
  `createTopicConnection` in interface `TopicConnectionFactory`
Throws:
  `JMSException`

#### getTransactionAwareConnectionProxy

    protected Connection getTransactionAwareConnectionProxy(Connection target)

Wrap the given Connection with a proxy that delegates every method call to it but handles Session lookup in a transaction-aware fashion.

Parameters:
  `target` - the original Connection to wrap
Returns:
  the wrapped Connection