Using Topic Views 5: Naming Reference Topic With Topic Content

Push Technology - July 9, 2019

Using topic content to name a reference topic

Let’s quickly introduce a new topic tree before we go any further, which lends itself well to this use case. The Demo/Fx topic tree is driven by this script: It pulls real market data from to populate a tree of foreign exchange prices.

  • Subscribe to the new topics.
  • Open the Subscriptions tab to observe their structure and the changing values.

Notice that the topics are named Demos/Fx/raw/0, 1, 2, etc., and that each topic contains the field  pairName that holds a string giving a more understandable name for the particular currency trade, such as “EUR:USD”. In this example, we will use a topic view to create intuitively named reference topics using the pairName values.

Discussion: It is not always possible to adjust the topic publishing habits of another Diffusion client: it may belong to a third party with different priorities. Using a topic view can quickly and pragmatically solve this problem.

  • Open the Topic Views tab.
  • Click Add and create a new topic view named Demos/Fx currency pairs
  • Give it the specification:map ?Demos/Fx/raw/.* to Demos/Fx/<scalar(/pairName)>

  • Click Add and open the Topics tab.
  • Browse to the topic branch Demos/Fx to see the more intuitively named reference topics created by the topic view.


Using the source value directive scalar() we have built reference topics with more intelligible names, using values from within the source topic.

Next: Changing topic properties of reference topics.

The Diffusion® Intelligent Event-Data Platform makes it easy to consume, enrich and deliver event-data in real-time across all network conditions. Push Technology pioneered and is the sole provider of real-time delta data streaming™ technology that powers mission-critical business applications worldwide. Leading brands use Push Technology to bring innovative products to market faster by reducing the software development efforts using the low-code features. The Diffusion® Intelligent Event-Data Platform is available on-premise, in-the-cloud, or in a hybrid configuration. Learn how Push Technology can reduce infrastructure costs, and increase speed, efficiency, and reliability, of your web, mobile, and IoT application.

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