SingleConnectionFactory (Spring Framework 3.2.0.RC2 API)

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

All Implemented Interfaces:

javax.jms.ConnectionFactory, javax.jms.ExceptionListener, javax.jms.QueueConnectionFactory, javax.jms.TopicConnectionFactory, DisposableBean, InitializingBean

Direct Known Subclasses:

CachingConnectionFactory, SingleConnectionFactory102
```
public class SingleConnectionFactory
extends java.lang.Object
implements javax.jms.ConnectionFactory, javax.jms.QueueConnectionFactory, javax.jms.TopicConnectionFactory, javax.jms.ExceptionListener, InitializingBean, DisposableBean
```
A JMS ConnectionFactory adapter that returns the same Connection from all createConnection() calls, and ignores calls to Connection.close(). According to the JMS Connection model, this is perfectly thread-safe (in contrast to e.g. JDBC). The shared Connection can be automatically recovered in case of an Exception.
You can either pass in a specific JMS Connection directly or let this factory lazily create a Connection via a given target ConnectionFactory. This factory generally works with JMS 1.1 as well as the JMS 1.0.2 API.
Note that when using the JMS 1.0.2 API, this ConnectionFactory will switch into queue/topic mode according to the JMS API methods used at runtime: createQueueConnection and createTopicConnection will lead to queue/topic mode, respectively; generic createConnection calls will lead to a JMS 1.1 connection which is able to serve both modes.
Useful for testing and standalone environments in order to keep using the same Connection for multiple JmsTemplate calls, without having a pooling ConnectionFactory underneath. This may span any number of transactions, even concurrently executing transactions.
Note that Spring's message listener containers support the use of a shared Connection within each listener container instance. Using SingleConnectionFactory in combination only really makes sense for sharing a single JMS Connection across multiple listener containers.

Since:

1.1

Author:

Juergen Hoeller, Mark Pollack

See Also:
JmsTemplate, SimpleMessageListenerContainer, DefaultMessageListenerContainer.setCacheLevel(int)

Field Summary

Fields
Modifier and Type Field and Description

protected org.apache.commons.logging.Log logger

Fields
Modifier and Type	Field and Description
`protected org.apache.commons.logging.Log`	`logger`

Constructor Summary

Constructors
Constructor and Description
`SingleConnectionFactory()` Create a new SingleConnectionFactory for bean-style usage.
`SingleConnectionFactory(javax.jms.Connection target)` Create a new SingleConnectionFactory that always returns the given Connection.
`SingleConnectionFactory(javax.jms.ConnectionFactory targetConnectionFactory)` Create a new SingleConnectionFactory that always returns a single Connection that it will lazily create via the given target ConnectionFactory.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`afterPropertiesSet()` Make sure a Connection or ConnectionFactory has been set.
`protected void`	`closeConnection(javax.jms.Connection con)` Close the given Connection.
`javax.jms.Connection`	`createConnection()`
`javax.jms.Connection`	`createConnection(java.lang.String username, java.lang.String password)`
`javax.jms.QueueConnection`	`createQueueConnection()`
`javax.jms.QueueConnection`	`createQueueConnection(java.lang.String username, java.lang.String password)`
`protected javax.jms.Session`	`createSession(javax.jms.Connection con, java.lang.Integer mode)` Create a default Session for this ConnectionFactory, adaptign to JMS 1.0.2 style queue/topic mode if necessary.
`javax.jms.TopicConnection`	`createTopicConnection()`
`javax.jms.TopicConnection`	`createTopicConnection(java.lang.String username, java.lang.String password)`
`void`	`destroy()` Close the underlying shared connection.
`protected javax.jms.Connection`	`doCreateConnection()` Create a JMS Connection via this template's ConnectionFactory.
`protected java.lang.String`	`getClientId()` Return a JMS client ID for the single Connection created and exposed by this ConnectionFactory, if any.
`protected javax.jms.ExceptionListener`	`getExceptionListener()` Return the JMS ExceptionListener implementation that should be registered with with the single Connection created by this factory, if any.
`protected javax.jms.Session`	`getSession(javax.jms.Connection con, java.lang.Integer mode)` Template method for obtaining a (potentially cached) Session.
`protected javax.jms.Connection`	`getSharedConnectionProxy(javax.jms.Connection target)` Wrap the given Connection with a proxy that delegates every method call to it but suppresses close calls.
`javax.jms.ConnectionFactory`	`getTargetConnectionFactory()` Return the target ConnectionFactory which will be used to lazily create a single Connection, if any.
`void`	`initConnection()` Initialize the underlying shared Connection.
`protected boolean`	`isReconnectOnException()` Return whether the single Connection should be renewed when a JMSException is reported by the underlying Connection.
`void`	`onException(javax.jms.JMSException ex)` Exception listener callback that renews the underlying single Connection.
`protected void`	`prepareConnection(javax.jms.Connection con)` Prepare the given Connection before it is exposed.
`void`	`resetConnection()` Reset the underlying shared Connection, to be reinitialized on next access.
`void`	`setClientId(java.lang.String clientId)` Specify a JMS client ID for the single Connection created and exposed by this ConnectionFactory.
`void`	`setExceptionListener(javax.jms.ExceptionListener exceptionListener)` Specify an JMS ExceptionListener implementation that should be registered with with the single Connection created by this factory.
`void`	`setReconnectOnException(boolean reconnectOnException)` Specify whether the single Connection should be reset (to be subsequently renewed) when a JMSException is reported by the underlying Connection.
`void`	`setTargetConnectionFactory(javax.jms.ConnectionFactory targetConnectionFactory)` Set the target ConnectionFactory which will be used to lazily create a single Connection.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - logger
```
protected final org.apache.commons.logging.Log logger
```
- Constructor Detail
  - SingleConnectionFactory
```
public SingleConnectionFactory()
```
    Create a new SingleConnectionFactory for bean-style usage.
    
    See Also:
    setTargetConnectionFactory(javax.jms.ConnectionFactory)
  - SingleConnectionFactory
```
public SingleConnectionFactory(javax.jms.Connection target)
```
    Create a new SingleConnectionFactory that always returns the given Connection.
    
    Parameters:
    target - the single Connection
  - SingleConnectionFactory
```
public SingleConnectionFactory(javax.jms.ConnectionFactory targetConnectionFactory)
```
    Create a new SingleConnectionFactory that always returns a single Connection that it will lazily create via the given target ConnectionFactory.
    
    Parameters:
    targetConnectionFactory - the target ConnectionFactory
- Method Detail
  - setTargetConnectionFactory
```
public void setTargetConnectionFactory(javax.jms.ConnectionFactory targetConnectionFactory)
```
    Set the target ConnectionFactory which will be used to lazily create a single Connection.
  - getTargetConnectionFactory
```
public javax.jms.ConnectionFactory getTargetConnectionFactory()
```
    Return the target ConnectionFactory which will be used to lazily create a single Connection, if any.
  - setClientId
```
public void setClientId(java.lang.String clientId)
```
    Specify a JMS client ID for the single Connection created and exposed by this ConnectionFactory.
    Note that client IDs need to be unique among all active Connections of the underlying JMS provider. Furthermore, a client ID can only be assigned if the original ConnectionFactory hasn't already assigned one.
    
    See Also:
    Connection.setClientID(java.lang.String), setTargetConnectionFactory(javax.jms.ConnectionFactory)
  - getClientId
```
protected java.lang.String getClientId()
```
    Return a JMS client ID for the single Connection created and exposed by this ConnectionFactory, if any.
  - setExceptionListener
```
public void setExceptionListener(javax.jms.ExceptionListener exceptionListener)
```
    Specify an JMS ExceptionListener implementation that should be registered with with the single Connection created by this factory.
    
    See Also:
    setReconnectOnException(boolean)
  - getExceptionListener
```
protected javax.jms.ExceptionListener getExceptionListener()
```
    Return the JMS ExceptionListener implementation that should be registered with with the single Connection created by this factory, if any.
  - setReconnectOnException
```
public void setReconnectOnException(boolean reconnectOnException)
```
    Specify whether the single Connection should be reset (to be subsequently renewed) when a JMSException is reported by the underlying Connection.
    Default is "false". Switch this to "true" to automatically trigger recovery based on your JMS provider's exception notifications.
    Internally, this will lead to a special JMS ExceptionListener (this SingleConnectionFactory itself) being registered with the underlying Connection. This can also be combined with a user-specified ExceptionListener, if desired.
    
    See Also:
    setExceptionListener(javax.jms.ExceptionListener)
  - isReconnectOnException
```
protected boolean isReconnectOnException()
```
    Return whether the single Connection should be renewed when a JMSException is reported by the underlying Connection.
  - afterPropertiesSet
```
public void afterPropertiesSet()
```
    Make sure a Connection or ConnectionFactory has been set.
    
    Specified by:
    
    afterPropertiesSet in interface InitializingBean
  - createConnection
```
public javax.jms.Connection createConnection()
                                      throws javax.jms.JMSException
```
    Specified by:
    
    createConnection in interface javax.jms.ConnectionFactory
    
    Throws:
    
    javax.jms.JMSException
  - createConnection
```
public javax.jms.Connection createConnection(java.lang.String username,
                                    java.lang.String password)
                                      throws javax.jms.JMSException
```
    Specified by:
    
    createConnection in interface javax.jms.ConnectionFactory
    
    Throws:
    
    javax.jms.JMSException
  - createQueueConnection
```
public javax.jms.QueueConnection createQueueConnection()
                                                throws javax.jms.JMSException
```
    Specified by:
    
    createQueueConnection in interface javax.jms.QueueConnectionFactory
    
    Throws:
    
    javax.jms.JMSException
  - createQueueConnection
```
public javax.jms.QueueConnection createQueueConnection(java.lang.String username,
                                              java.lang.String password)
                                                throws javax.jms.JMSException
```
    Specified by:
    
    createQueueConnection in interface javax.jms.QueueConnectionFactory
    
    Throws:
    
    javax.jms.JMSException
  - createTopicConnection
```
public javax.jms.TopicConnection createTopicConnection()
                                                throws javax.jms.JMSException
```
    Specified by:
    
    createTopicConnection in interface javax.jms.TopicConnectionFactory
    
    Throws:
    
    javax.jms.JMSException
  - createTopicConnection
```
public javax.jms.TopicConnection createTopicConnection(java.lang.String username,
                                              java.lang.String password)
                                                throws javax.jms.JMSException
```
    Specified by:
    
    createTopicConnection in interface javax.jms.TopicConnectionFactory
    
    Throws:
    
    javax.jms.JMSException
  - initConnection
```
public void initConnection()
                    throws javax.jms.JMSException
```
    Initialize the underlying shared Connection.
    Closes and reinitializes the Connection if an underlying Connection is present already.
    
    Throws:
    
    javax.jms.JMSException - if thrown by JMS API methods
  - onException
```
public void onException(javax.jms.JMSException ex)
```
    Exception listener callback that renews the underlying single Connection.
    
    Specified by:
    
    onException in interface javax.jms.ExceptionListener
  - destroy
```
public void destroy()
```
    Close the underlying shared connection. The provider of this ConnectionFactory needs to care for proper shutdown.
    As this bean implements DisposableBean, a bean factory will automatically invoke this on destruction of its cached singletons.
    
    Specified by:
    
    destroy in interface DisposableBean
  - resetConnection
```
public void resetConnection()
```
    Reset the underlying shared Connection, to be reinitialized on next access.
  - doCreateConnection
```
protected javax.jms.Connection doCreateConnection()
                                           throws javax.jms.JMSException
```
    Create a JMS Connection via this template's ConnectionFactory.
    
    Returns:
    the new JMS Connection
    
    Throws:
    
    javax.jms.JMSException - if thrown by JMS API methods
  - prepareConnection
```
protected void prepareConnection(javax.jms.Connection con)
                          throws javax.jms.JMSException
```
    Prepare the given Connection before it is exposed.
    The default implementation applies ExceptionListener and client id. Can be overridden in subclasses.
    
    Parameters:
    con - the Connection to prepare
    
    Throws:
    
    javax.jms.JMSException - if thrown by JMS API methods
    See Also:
    setExceptionListener(javax.jms.ExceptionListener), setReconnectOnException(boolean)
  - getSession
```
protected javax.jms.Session getSession(javax.jms.Connection con,
                           java.lang.Integer mode)
                                throws javax.jms.JMSException
```
    Template method for obtaining a (potentially cached) Session.
    The default implementation always returns null. Subclasses may override this for exposing specific Session handles, possibly delegating to createSession(javax.jms.Connection, java.lang.Integer) for the creation of raw Session objects that will then get wrapped and returned from here.
    
    Parameters:
    con - the JMS Connection to operate on
    mode - the Session acknowledgement mode (Session.TRANSACTED or one of the common modes)
    
    Returns:
    the Session to use, or null to indicate creation of a raw standard Session
    
    Throws:
    
    javax.jms.JMSException - if thrown by the JMS API
  - createSession
```
protected javax.jms.Session createSession(javax.jms.Connection con,
                              java.lang.Integer mode)
                                   throws javax.jms.JMSException
```
    Create a default Session for this ConnectionFactory, adaptign to JMS 1.0.2 style queue/topic mode if necessary.
    
    Parameters:
    con - the JMS Connection to operate on
    mode - the Session acknowledgement mode (Session.TRANSACTED or one of the common modes)
    
    Returns:
    the newly created Session
    
    Throws:
    
    javax.jms.JMSException - if thrown by the JMS API
  - closeConnection
```
protected void closeConnection(javax.jms.Connection con)
```
    Close the given Connection.
    
    Parameters:
    con - the Connection to close
  - getSharedConnectionProxy
```
protected javax.jms.Connection getSharedConnectionProxy(javax.jms.Connection target)
```
    Wrap the given Connection with a proxy that delegates every method call to it but suppresses close calls. This is useful for allowing application code to handle a special framework Connection just like an ordinary Connection from a JMS ConnectionFactory.
    
    Parameters:
    target - the original Connection to wrap
    
    Returns:
    the wrapped Connection

Class SingleConnectionFactory

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

logger

Constructor Detail

SingleConnectionFactory

SingleConnectionFactory

SingleConnectionFactory

Method Detail

setTargetConnectionFactory

getTargetConnectionFactory

setClientId

getClientId

setExceptionListener

getExceptionListener

setReconnectOnException

isReconnectOnException

afterPropertiesSet

createConnection

createConnection

createQueueConnection

createQueueConnection

createTopicConnection

createTopicConnection

initConnection

onException

destroy

resetConnection

doCreateConnection

prepareConnection

getSession

createSession

closeConnection

getSharedConnectionProxy