Search Debounce Utility
Component Detail
Description
Wraps a RxDart or Timer-based debounce around the search input stream to prevent excessive Supabase queries on every keystroke. Configurable debounce interval (default 300ms) and minimum query length.
search-debounce-utility
Summaries
The Search Debounce Utility protects the organization's database infrastructure costs by intelligently throttling search requests from mobile users. Without this control, every keystroke a user types triggers a live database query, resulting in thousands of unnecessary API calls per session and directly inflating cloud infrastructure costs. By enforcing a 300ms delay and minimum query length, this utility ensures the platform remains responsive and cost-efficient at scale, reducing backend load by an estimated 80–90% during active search sessions. This directly improves the end-user experience — searches feel snappy rather than laggy — while keeping operating costs predictable as the user base grows.
It is a low-complexity, high-leverage investment that pays dividends across every feature that includes a search interaction.
The Search Debounce Utility is a low-complexity shared utility with no external dependencies, making it one of the safest and fastest deliverables in the mobile layer. Development effort is minimal — estimated at 1–2 days including unit tests — and it can be built early in the sprint as a foundational building block before dependent search screens are implemented. Because it is marked as a shared component, it must be completed and tested before any feature that uses search input can be integrated end-to-end. The primary delivery risk is misconfiguration of the debounce interval: too short negates its purpose, too long degrades UX.
Testing must cover edge cases including rapid input bursts, minimum query length enforcement, and proper stream disposal to prevent memory leaks. No backend coordination is required.
The Search Debounce Utility wraps a RxDart BehaviorSubject or Dart Timer around a raw Stream
Integration pattern: upstream search text fields pipe their onChange events into this utility before connecting to any Supabase query service. In-flight query cancellation is handled by downstream service layers listening to the debounced stream; this utility is solely responsible for stream throttling and length gating. No state management framework dependency; pure Dart streams.
Responsibilities
- Debounce raw input stream before emitting to service
- Enforce minimum query length threshold
- Cancel in-flight queries on new input
- Expose debounced stream
Interfaces
debounce(Stream<String> input)
setDebounceDuration(Duration d)
setMinQueryLength(int length)
dispose()