In contrast to queues, in which each message is processed by a single consumer, topics and subscriptions provide a one-to-many form of communication, in a publish/subscribe pattern. They are useful for scaling to a very large numbers of recipients as each published message is made available to each subscription registered with the topic.
Messages are sent to a topic and delivered to one or more associated subscriptions, depending on filter rules that can be set on a per-subscription basis. The subscriptions can use additional filters to restrict the messages that they want to receive. Messages are sent to a topic in the same way they are sent to a queue, but messages are not received from the topic directly. Instead, they are received from subscriptions. A topic subscription resembles a virtual queue that receives copies of the messages that are sent to the topic. Messages are received from a subscription identically to the way they are received from a queue.
Select the Master Data tab.
Click Topics.
A list of the existing topics is shown.
Click Add.
The new topic dialog opens.
Enter a name and description for the topic.
The name cannot contain spaces.
Click Save.
The topic is saved.
Select the Master Data tab.
Click Topics.
Select a topic.
Click Edit.
The topic dialog opens.
Modify the name and description of the topic.
Click Save.
The topic is updated.
Select the Master Data tab.
Click Topics.
Select a topic.
Click Delete.
Click Yes to confirm.
The topic is deleted.
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