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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.
1. Select the Master Data tab.
2. Click Topics.
A list of the existing topics is shown.
3. Click Add.
The new topic dialog opens.
4. Enter a name and description for the topic.
The name cannot contain spaces.
5. Click Save.
The topic is saved.
1. Select the Master Data tab.
2. Click Topics.
3. Select a topic.
4. Click Edit.
The topic dialog opens.
5. Modify the name and description of the topic.
6. Click Save.
The topic is updated.
1. Select the Master Data tab.
2. Click Topics.
3. Select a topic.
4. Click Delete.
5. Click Yes to confirm.
The topic is deleted.