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In messaging systems, message routing is done on the basis of a concept called Topics: First, we need to have topics created in the EI Message Broker runtime. A JMS client can then be configured to publish messages to this topic and other JMS clients can be configured as subscribers of this topic. When the publisher sends a message to the topic, it will be dispatched to all the JMS clients that are subscribed to that topic.

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• Find out about the permissions required for working with Topics.
• Creating roles and assigning permissions.
• Creating users and assigning roles. 

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Adding topics from the management console

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Add Add

To create a new topic using the management console:

1. Log in to the management console.
2. In the Main tab, click Topics -> Add. The Add Topic screen will open.

3. Enter a name for the topic in the Topic field. 

   Note

   Note the following for the Topic name: Topic name can starts with any of the following: * , alphanumeric characters (a-z, A-Z or 0-9). These can be used any number of times delimited by dots.  Topic name can end with the following: * , alphanumeric characters, hash (#).   The “/” symbol (TENANT_SEPARATOR) can only be used to separate the tenant domain from the topic name when creating topics/subscribing to topics from external clients. The colon (":") can be used in Topic names if the <allowStrictNameValidation> property is set to false in the broker.xml file (stored in the <EI_HOME>/wso2/broker/conf folder). This is only applicable for the AMQP transport.

4. Now you need to grant permissions for users in your system to publish and subscribe to the topic you are creating. You will be granting these permissions to users based on the user's role. As shown below, all the user roles in your tenant domain will be listed. You can select the relevant check box against each role:
   
   • If the Subscribe check box is selected, the users linked to the role has permission to subscribe to the topic.
   • If the Publish check box is selected, the users linked to the role has permission to publish information to the topic.
   If you want to create new user roles for topic subscription and publishing see the documentation on creating users and roles.

   

   Info
   The user that creates a topic in the system is by default granted permission to Subscribe and Publish to that particular topic. This is handled in the system by automatically creating an internal role and assigning it to the user creating the topic.

5. Click Add Topic to create the topic.
6. If the topic is added successfully, a message appears. Click OK to view the topic browser where the newly added topic is listed in a tree view:

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   Topic Browser Topic Browser

   
7. Click on the topic to view all the operations available. See the section on viewing topic details for more information.

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1. Click on the topic in the Topic Browser. The Details option will be listed.

2. Click Details to open the Topic Details screen:
   The following table shows descriptions of the parameters on this page:

   Detail	Description
   Permission Details	Permissions related to the topic can be viewed here. Permissions can be changed by clearing or selecting the provided check boxes and clicking Update Permissions once done.
   JMS Subscription Details	All the durable and non-durable JMS subscriptions are listed here.
   Publish	Publish a sample XML message to a topic. When there is a subscription for the topic, the event sink URL receives the XML message specified here. Click the Publish button after placing the XML message in the provided space.

Deleting a topic

To delete a topic, the subscription count for that topic and its children should be zero. If not, an error message appears specifying that there are subscriptions for the topic or its children.