Define topic mappings on a publish/subscribe broker profile,
part of the publish/subscribe bridge on a WebSphere® MQ
link. A topic mapping is a mapping between a topic on a service integration
bus and a stream queue and subscription point provided by a WebSphere MQ broker.
Before you begin
You have to know the bus name, messaging engine name, WebSphere MQ link name and the name of
the broker profile on which you intend to define the topic mappings.
About this task
Topic mappings are associated with a WebSphere MQ
link publish/subscribe broker profile. Together, the profile and topic
mappings enable publication and subscription with a broker in a IBM MQ network.
Note: Publication
messages forwarded to a message broker in the IBM MQ network are republished
on the same topic as they were originally published to in the service
integration bus topic space, and vice versa.
To
define topic mappings, use the administrative console to complete
the following steps:
Procedure
- In the navigation pane, click
- In the content pane, either click New to
add a new topic mapping, or click the name of a existing topic mapping
that you want to modify. The Topic Mapping [Settings] form is displayed.
- Type the topic name.
The name of the topic on the service integration bus. The name must be the same as the topic name on the message broker in a IBM MQ network.
The
topic name can contain wildcards that are in the service integration
bus syntax. For more information, see Wild cards in topic mapping.
- Select the name of the topic space that contains the topic. If you don't select a name the default is used.
- Select the direction of publication flow. The
direction of publication flow can be:
- Bi-directional
- Messages flow in both directions between the bus and IBM MQ.
- To IBM MQ
- Messages flow only from the bus to IBM MQ. That
is, from WebSphere Application Server to a message
broker in the IBM MQ network.
- From IBM MQ
- Messages flow only to the bus from IBM MQ. That
is, from a message broker in the IBM MQ network
to WebSphere Application Server.
- Select the broker stream queue you want to use. If the
queue you require is not on the list, click other, please
specify then enter the name of the broker stream queue.
The broker stream queue in this instance is a queue on the IBM MQ queue manager to which the
message broker is connected. This queue is being used as the input
node for a message flow containing a publication node. Messages sent
to this queue are processed by the message broker, then published
to applications that have subscribed on the topic specified in the
message.
Stream names are case sensitive.
After you type
a new name, then save your changes, the name becomes available for
selection in the drop-down list.
- Select the IBM MQ message
broker subscription point from which the service integration bus receives
messages. If the subscription point you require is not on the list,
click other, please specify then enter the
name of the subscription point.
The default subscription
point is used if no value is specified.
After you type a new
name, then save your changes, the name becomes available for selection
in the drop-down list.
- Click OK.
- Save your changes to the master configuration.
- Optional: If you have enabled dynamic configuration
updates, the changes take effect immediately. Otherwise, restart the
application server.