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A Topic is a named JSON schema you can use to communicate in a publish–subscribe messaging pattern. In a topic-based system, messages are published to “topics” or named logical channels. Subscribers in a topic-based system will receive all messages published to the topics to which they subscribe. The publisher is responsible for defining the topics to which subscribers can subscribe. Topic contains following information:

  • a unique name within the Workspace
  • JSON schema describing the objects to be exchanged

Creating Topics

Topic can be created via UI or API-call:

To create Topic via UI first choose “Topics” on navigational menu left. In the topics section you can select existing topics or create a new one:

Topics section

Then you need to select a unique name for the topic and create the desired JSON schema. In the window on the right we can see the object tree that demonstrates how the data type of the topic will be presented:

New topic

Editing Topics

To make changes to an existing topic, select the topic you need and then click “Edit”. You can also delete this topic by clicking “Delete”:

Edit topic

Here you can change the Topic name and JSON-schema and then save your changes:

Editing topic

Generating schema for JSON sample

You can also generate a JSON schema from an existing JSON sample by clicking the corresponding button:

Generate Schema

Then you can insert a JSON sample and generate a new schema:

Insert JSON sample

After that you can edit the new generated schema with all the necessary information:

Editing schema

Usage Example

In this example, we will create a flow using the Pub-Sub component. First you must choose a Topic on which your flow will be listening for messages:

Choose topic

Your Subscriber flow can automatically generate incoming data sample or you can do it yourself:

Trigger sample

Using Pub-Sub action you must choose a topic created earlier, by which your Publisher Flow will communicate with it’s Subscribers, and then you can enter new data:

Enter Data