org.springframework.jms.remoting
Class JmsInvokerClientInterceptor

java.lang.Object
  org.springframework.jms.remoting.JmsInvokerClientInterceptor

All Implemented Interfaces:

Advice, Interceptor, MethodInterceptor, InitializingBean

Direct Known Subclasses:

JmsInvokerProxyFactoryBean

public class JmsInvokerClientInterceptor
extends Object
implements MethodInterceptor, InitializingBean

MethodInterceptor for accessing a JMS-based remote service.

Serializes remote invocation objects and deserializes remote invocation result objects. Uses Java serialization just like RMI, but with the JMS provider as communication infrastructure.

To be configured with a QueueConnectionFactory and a target queue (either as Queue reference or as queue name).

Thanks to James Strachan for the original prototype that this JMS invoker mechanism was inspired by!

Since:

2.0

Author:

Juergen Hoeller, James Strachan

See Also:

setConnectionFactory(javax.jms.QueueConnectionFactory), setQueue(javax.jms.Queue), setQueueName(java.lang.String), JmsInvokerServiceExporter, JmsInvokerProxyFactoryBean

Constructor Summary

JmsInvokerClientInterceptor()

Method Summary

void	afterPropertiesSet() Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
protected RemoteInvocation	createRemoteInvocation(MethodInvocation methodInvocation) Create a new RemoteInvocation object for the given AOP method invocation.
protected Message	createRequestMessage(Session session, RemoteInvocation invocation) Create the invoker request message.
protected Message	doExecuteRequest(QueueSession session, Queue queue, Message requestMessage) Actually execute the given request, sending the invoker request message to the specified target queue and waiting for a corresponding response.
protected RemoteInvocationResult	executeRequest(RemoteInvocation invocation) Execute the given remote invocation, sending an invoker request message to this accessor's target queue and waiting for a corresponding response.
protected RemoteInvocationResult	extractInvocationResult(Message responseMessage) Extract the invocation result from the response message.
protected QueueConnectionFactory	getConnectionFactory() Return the QueueConnectionFactory to use for obtaining JMS QueueConnections.
Object	invoke(MethodInvocation methodInvocation)
protected RemoteInvocationResult	onInvalidResponse(Message responseMessage) Callback that is invoked by extractInvocationResult when it encounters an invalid response message.
protected Object	recreateRemoteInvocationResult(RemoteInvocationResult result) Recreate the invocation result contained in the given RemoteInvocationResult object.
protected Queue	resolveQueue(Session session) Resolve this accessor's target queue.
protected Queue	resolveQueueName(Session session, String queueName) Resolve the given queue name into a JMS Queue, via this accessor's DestinationResolver.
void	setConnectionFactory(QueueConnectionFactory connectionFactory) Set the QueueConnectionFactory to use for obtaining JMS QueueConnections.
void	setDestinationResolver(DestinationResolver destinationResolver) Set the DestinationResolver that is to be used to resolve Queue references for this accessor.
void	setMessageConverter(MessageConverter messageConverter) Specify the MessageConverter to use for turning RemoteInvocation objects into request messages, as well as response messages into RemoteInvocationResult objects.
void	setQueue(Queue queue) Set the target Queue to send invoker requests to.
void	setQueueName(String queueName) Set the name of target queue to send invoker requests to.
void	setRemoteInvocationFactory(RemoteInvocationFactory remoteInvocationFactory) Set the RemoteInvocationFactory to use for this accessor.

Methods inherited from class java.lang.Object

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

Constructor Detail

JmsInvokerClientInterceptor

public JmsInvokerClientInterceptor()

Method Detail

setConnectionFactory

public void setConnectionFactory(QueueConnectionFactory connectionFactory)

Set the QueueConnectionFactory to use for obtaining JMS QueueConnections.

getConnectionFactory

protected QueueConnectionFactory getConnectionFactory()

Return the QueueConnectionFactory to use for obtaining JMS QueueConnections.

setQueue

public void setQueue(Queue queue)

Set the target Queue to send invoker requests to.

setQueueName

public void setQueueName(String queueName)

Set the name of target queue to send invoker requests to. The specified name will be dynamically resolved via the DestinationResolver.

setDestinationResolver

public void setDestinationResolver(DestinationResolver destinationResolver)

Set the DestinationResolver that is to be used to resolve Queue references for this accessor.

The default resolver is a DynamicDestinationResolver. Specify a JndiDestinationResolver for resolving destination names as JNDI locations.

See Also:

DynamicDestinationResolver, JndiDestinationResolver

setRemoteInvocationFactory

public void setRemoteInvocationFactory(RemoteInvocationFactory remoteInvocationFactory)

Set the RemoteInvocationFactory to use for this accessor. Default is a DefaultRemoteInvocationFactory.

A custom invocation factory can add further context information to the invocation, for example user credentials.

setMessageConverter

public void setMessageConverter(MessageConverter messageConverter)

Specify the MessageConverter to use for turning RemoteInvocation objects into request messages, as well as response messages into RemoteInvocationResult objects.

Default is a SimpleMessageConverter, using a standard JMS ObjectMessage for each invocation / invocation result object.

Custom implementations may generally adapt Serializables into special kinds of messages, or might be specifically tailored for translating RemoteInvocation(Result)s into specific kinds of messages.

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

invoke

public Object invoke(MethodInvocation methodInvocation)
              throws Throwable

Specified by:

invoke in interface MethodInterceptor

Throws:

Throwable

createRemoteInvocation

protected RemoteInvocation createRemoteInvocation(MethodInvocation methodInvocation)

Create a new RemoteInvocation object for the given AOP method invocation. The default implementation delegates to the RemoteInvocationFactory.

Can be overridden in subclasses to provide custom RemoteInvocation subclasses, containing additional invocation parameters like user credentials. Note that it is preferable to use a custom RemoteInvocationFactory which is a reusable strategy.

Parameters:

methodInvocation - the current AOP method invocation

Returns:

the RemoteInvocation object

See Also:

RemoteInvocationFactory.createRemoteInvocation(org.aopalliance.intercept.MethodInvocation)

executeRequest

protected RemoteInvocationResult executeRequest(RemoteInvocation invocation)
                                         throws JMSException

Execute the given remote invocation, sending an invoker request message to this accessor's target queue and waiting for a corresponding response.

Parameters:

invocation - the RemoteInvocation to execute

Returns:

the RemoteInvocationResult object

Throws:

JMSException - in case of JMS failure

See Also:

doExecuteRequest(javax.jms.QueueSession, javax.jms.Queue, javax.jms.Message)

resolveQueue

protected Queue resolveQueue(Session session)
                      throws JMSException

Resolve this accessor's target queue.

Parameters:

session - the current JMS Session

Returns:

the resolved target Queue

Throws:

JMSException - if resolution failed

resolveQueueName

protected Queue resolveQueueName(Session session,
                                 String queueName)
                          throws JMSException

Resolve the given queue name into a JMS Queue, via this accessor's DestinationResolver.

Parameters:

session - the current JMS Session

queueName - the name of the queue

Returns:

the located Queue

Throws:

JMSException - if resolution failed

See Also:

setDestinationResolver(org.springframework.jms.support.destination.DestinationResolver)

createRequestMessage

protected Message createRequestMessage(Session session,
                                       RemoteInvocation invocation)
                                throws JMSException

Create the invoker request message.

The default implementation creates a JMS ObjectMessage for the given RemoteInvocation object.

Parameters:

session - the current JMS Session

invocation - the remote invocation to send

Returns:

the JMS Message to send

Throws:

JMSException - if the message could not be created

doExecuteRequest

protected Message doExecuteRequest(QueueSession session,
                                   Queue queue,
                                   Message requestMessage)
                            throws JMSException

Actually execute the given request, sending the invoker request message to the specified target queue and waiting for a corresponding response.

The default implementation is based on a standard JMS QueueRequestor, using a freshly obtained JMS Session.

Parameters:

session - the JMS Session to use

queue - the resolved target Queue to send to

requestMessage - the JMS Message to send

Returns:

the RemoteInvocationResult object

Throws:

JMSException - in case of JMS failure

extractInvocationResult

protected RemoteInvocationResult extractInvocationResult(Message responseMessage)
                                                  throws JMSException

Extract the invocation result from the response message.

The default implementation expects a JMS ObjectMessage carrying a RemoteInvocationResult object. If an invalid response message is encountered, the onInvalidResponse callback gets invoked.

Parameters:

responseMessage - the response message

Returns:

the invocation result

Throws:

JMSException - is thrown if a JMS exception occurs

See Also:

onInvalidResponse(javax.jms.Message)

onInvalidResponse

protected RemoteInvocationResult onInvalidResponse(Message responseMessage)
                                            throws JMSException

Callback that is invoked by extractInvocationResult when it encounters an invalid response message.

The default implementation throws a MessageFormatException.

Parameters:

responseMessage - the invalid response message

Returns:

an alternative invocation result that should be returned to the caller (if desired)

Throws:

JMSException - if the invalid response should lead to an infrastructure exception propagated to the caller

See Also:

extractInvocationResult(javax.jms.Message)

recreateRemoteInvocationResult

protected Object recreateRemoteInvocationResult(RemoteInvocationResult result)
                                         throws Throwable

Recreate the invocation result contained in the given RemoteInvocationResult object. The default implementation calls the default recreate method.

Can be overridden in subclass to provide custom recreation, potentially processing the returned result object.

Parameters:

result - the RemoteInvocationResult to recreate

Returns:

a return value if the invocation result is a successful return

Throws:

Throwable - if the invocation result is an exception

See Also:

RemoteInvocationResult.recreate()