org.jboss.soa.esb.client
Class ServiceInvoker

java.lang.Object
  org.jboss.soa.esb.client.ServiceInvoker

public class ServiceInvoker
extends java.lang.Object

Invoker class for managing Message delivery to a specified Service.

Manages loading of EPRs, Courier selection and message delivery. Provides a unified/simplified interface for message delivery. The ServiceInvoker will cache entries from the registry for the relevant service. This cache will be refreshed under the following conditions: (i) all of the entries fail on a delivery attempt. (ii) the cache times out (see property org.jboss.soa.esb.registry.cache.life): default is 60 seconds.

Author:

tom.fennelly@jboss.com

Field Summary

static java.lang.String	DEAD_LETTER_SERVICE_NAME
static java.lang.String	DELIVER_TO
static Service	dlqService Dead letter Service
static java.lang.String	INTERNAL_SERVICE_CATEGORY

Constructor Summary

ServiceInvoker(Service service)
Public constructor.

ServiceInvoker(Service service, java.util.List<PortReference.Extension> extensions)
Public constructor.

ServiceInvoker(java.lang.String serviceCategory, java.lang.String serviceName)
Public constructor.

Method Summary

void	deliverAsync(Message message) Asynchronously deliver the supplied message to the target service associated with this invoker instance.
Message	deliverSync(Message message, long timeoutMillis) Synchronously deliver the supplied message to the target service associated with this invoker instance.
protected static void	deliverToDeadLetterService(Message message) Deliver a message to the Dead Letter Channel Service.
protected TwoWayCourier	getCourier(EPR epr) Get a Courier for the supplied EPR.
protected EPR	getReplyToAddress(EPR toEpr) Get the reply to address for synchronous delivery.
Service	getService() Get the details of Service to which this invoker instance is delivering messages.
java.lang.String	getServiceCategory() Get the Service category name for the Service for which this instance is delivering messages.
java.lang.String	getServiceName() Get the Service name for the Service for which this instance is delivering messages.
void	loadServiceClusterInfo() Loads the EPRs fresh from the Registry.

Methods inherited from class java.lang.Object

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

Field Detail

INTERNAL_SERVICE_CATEGORY

public static final java.lang.String INTERNAL_SERVICE_CATEGORY

See Also:

Constant Field Values

DEAD_LETTER_SERVICE_NAME

public static final java.lang.String DEAD_LETTER_SERVICE_NAME

See Also:

Constant Field Values

DELIVER_TO

public static final java.lang.String DELIVER_TO

See Also:

Constant Field Values

dlqService

public static final Service dlqService

Dead letter Service

Constructor Detail

ServiceInvoker

public ServiceInvoker(Service service)
               throws MessageDeliverException

Public constructor.

Parameters:

service - The Service to which this instance will deliver messages.

Throws:

MessageDeliverException - Failed to deliver message to endpoint.

ServiceInvoker

public ServiceInvoker(Service service,
                      java.util.List<PortReference.Extension> extensions)
               throws MessageDeliverException

Public constructor.

Parameters:

service - The Service to which this instance will deliver messages.

extensions - The extensions to be added to the target service.

Throws:

MessageDeliverException - Failed to deliver message to endpoint.

ServiceInvoker

public ServiceInvoker(java.lang.String serviceCategory,
                      java.lang.String serviceName)
               throws MessageDeliverException

Public constructor.

Parameters:

serviceCategory - The category name of the Service to which this instance will deliver messages.

serviceName - The name of the Service to which this instance will deliver messages.

Throws:

MessageDeliverException - Failed to deliver message to endpoint.

Method Detail

deliverSync

public Message deliverSync(Message message,
                           long timeoutMillis)
                    throws MessageDeliverException,
                           RegistryException,
                           FaultMessageException

Synchronously deliver the supplied message to the target service associated with this invoker instance. If the To field of the Message is set, then it will be ignored in favour of the equivalent information obtained through the parameters provided during instance construction.

Parameters:

message - The message to be delivered.

timeoutMillis - Number of milliseconds before synchronous reply pickup should timeout.

Returns:

Returns the reply message if the message was delivered without error, otherwise an exception is thrown.

Throws:

RegistryException - Failed to lookup Service endpoint.

MessageDeliverException - Failed to deliver message to endpoint.

FaultMessageException

deliverAsync

public void deliverAsync(Message message)
                  throws MessageDeliverException

Asynchronously deliver the supplied message to the target service associated with this invoker instance. If the To field of the Message is set, then it will be ignored in favour of the equivalent information obtained through the parameters provided during instance construction.

Parameters:

message - The message to be delivered.

Throws:

MessageDeliverException - Failed to deliver message, after trying all available EPRs.

deliverToDeadLetterService

protected static void deliverToDeadLetterService(Message message)
                                          throws MessageDeliverException

Deliver a message to the Dead Letter Channel Service.

For internal package use only.

Parameters:

message - The message to be delivered to the dead letter chennel.

Throws:

RegistryException - Service endpoint lookup failure.

MessageDeliverException - Message delivery failure.

getService

public Service getService()

Get the details of Service to which this invoker instance is delivering messages.

Returns:

The Service details.

getServiceCategory

public java.lang.String getServiceCategory()

Get the Service category name for the Service for which this instance is delivering messages.

Returns:

Service Category.

getServiceName

public java.lang.String getServiceName()

Get the Service name for the Service for which this instance is delivering messages.

Returns:

Service name.

getReplyToAddress

protected EPR getReplyToAddress(EPR toEpr)
                         throws ConfigurationException

Get the reply to address for synchronous delivery.

Parameters:

toEpr - The to address.

Returns:

The replyTo address.

Throws:

ConfigurationException - Unable to support synchronous reply on 'to' address.

getCourier

protected TwoWayCourier getCourier(EPR epr)
                            throws CourierException,
                                   MalformedEPRException

Get a Courier for the supplied EPR.

Parameters:

epr - The EPR for which a Courier is being sought.

Returns:

The courier for the EPR.

Throws:

CourierException - A courier implementation cannot be created.

MalformedEPRException - Bad EPR.

loadServiceClusterInfo

public void loadServiceClusterInfo()
                            throws MessageDeliverException

Loads the EPRs fresh from the Registry. Right now we will do this every minute until we can expect to get updates from the registry. For now this should work just fine.

Throws:

MessageDeliverException - Registry lookup failure.