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This design is known as a timer-based polling approach. The sample client might use JavaScript libraries such as ReactJS to compose the website UI and the Axios HTTP client to handle requests to a backend API endpoint (The backend can be built using REST and any back-end framework such as NodeJS or any low-code framework).
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The streaming database writes back results to Kafka topics by using sink operation in real-time. Now, we need to add JavaScript code to consume and process discount messages received from Kafka and update the UI in real-time to display them. We can use the KafkaJS library, which is a popular Kafka client for Node.js to listen and consume Kafka messages.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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The first component is a database that acts as a data source, which can be PostgreSQL (Other popular options include MongoDB or MySQL). As data changes in the database, a change is detected using the Log-based CDC (Change Data Capture) capabilities of the database. It captures the change and records it in a transaction log. The captured changes are then transformed into a change event that can be consumed in real-time by downstream systems (a message broker) such as Kafka.
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