Debounce short search queries for longer - #6651
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Message search and the add-members user search have no minimum query length, so a one character query is sent as typed. Those queries match a large portion of the data set, which makes them the slowest ones to serve, while they are usually just a step towards the query the user is after. Debounce queries of 1-2 characters for at least 500ms instead of the configured 300ms, matching the iOS SDK. The thresholds live in SearchDebounce in ui-common, marked as internal API since they are not meant to be configured by integrators: the existing debounce still applies to regular queries, and wins for short ones too when it is longer than 500ms. Applied to the Compose message search in ChannelListViewModel, to the debounced input listener of the XML SearchInputView, and to the user search in AddMembersViewController. Channel search is left alone: it only queries from 3 characters on, so it never sends the short autocomplete queries this targets, and iOS likewise debounces only queries built around a text-search operator. Mention autocomplete is also left alone, as it queries the members of a single channel. SearchInputView.clear() now cancels a debounce still pending from the last keystroke, which would otherwise notify the listener with the query being cleared and re-run the search the user just dismissed. Debouncer gained internal submit/submitSuspendable overloads taking the debounce period for a single piece of work. The public API of every module is unchanged. AND-1409 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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The add-members search trims the query before building the request, so a padded short query was debounced as a regular one while firing a one character queryUsers. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Every touched module already passes -opt-in=InternalStreamChatApi. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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WalkthroughThe change adds shared query-length debounce logic. Short queries use at least 500 ms. Search inputs and channel searches use the calculated interval. ChangesSearch debounce flow
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change adjusts search debounce timing and cancels stale pending searches when input is cleared. It is merge-ready after normal review and checks; the remaining follow-ups are limited to test precision and annotation hygiene, with no actionable merge-blocking risk identified. Sequence Diagram(s)sequenceDiagram
participant SearchInputView
participant SearchDebounce
participant Debouncer
SearchInputView->>SearchDebounce: debounceMsFor(query, configured delay)
SearchDebounce-->>SearchInputView: selected debounce interval
SearchInputView->>Debouncer: submit(selected interval, search callback)
Debouncer-->>SearchInputView: execute latest pending callback
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Actionable comments posted: 3
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Inline comments:
In
`@stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/viewmodel/channels/ChannelListViewModel.kt`:
- Around line 812-814: Explicitly add InternalStreamChatApi to the existing
`@OptIn` annotation on ChannelListViewModel and annotate SearchInputView with
`@OptIn`(InternalStreamChatApi::class); update both affected declarations without
changing their behavior.
In
`@stream-chat-android-compose/src/test/kotlin/io/getstream/chat/android/compose/viewmodel/channels/ChannelListViewModelTest.kt`:
- Around line 616-673: Strengthen debounce boundary tests: in
stream-chat-android-compose/src/test/kotlin/io/getstream/chat/android/compose/viewmodel/channels/ChannelListViewModelTest.kt
lines 616-673, verify no message search occurs one millisecond before each
short, configured-default, and configured-long interval, then exactly one occurs
at the boundary. Apply the same exact-boundary assertions for both
custom-interval overloads and replacement submission in
stream-chat-android-core/src/test/java/io/getstream/chat/android/core/utils/DebouncerTest.kt
lines 132-177. In
stream-chat-android-ui-common/src/test/kotlin/io/getstream/chat/android/ui/common/feature/channel/info/AddMembersViewControllerTest.kt
lines 182-215, verify short and padded-short queries do not start before
SHORT_QUERY_DEBOUNCE_MS.
In
`@stream-chat-android-ui-common/src/test/kotlin/io/getstream/chat/android/ui/common/feature/channel/info/AddMembersViewControllerTest.kt`:
- Around line 205-215: Update the test around QueryChanged and the queryUsers
invocation to capture the outbound request, then assert its autocomplete filter
value is "a" after the trimmed one-character query is searched. Preserve the
existing debounce and result assertions while ensuring the test no longer relies
only on call-order-based fixture results.
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📒 Files selected for processing (9)
stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/viewmodel/channels/ChannelListViewModel.ktstream-chat-android-compose/src/test/kotlin/io/getstream/chat/android/compose/viewmodel/channels/ChannelListViewModelTest.ktstream-chat-android-core/src/main/java/io/getstream/chat/android/core/utils/Debouncer.ktstream-chat-android-core/src/test/java/io/getstream/chat/android/core/utils/DebouncerTest.ktstream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/feature/channel/info/AddMembersViewController.ktstream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/utils/SearchDebounce.ktstream-chat-android-ui-common/src/test/kotlin/io/getstream/chat/android/ui/common/feature/channel/info/AddMembersViewControllerTest.ktstream-chat-android-ui-common/src/test/kotlin/io/getstream/chat/android/ui/common/utils/SearchDebounceTest.ktstream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/search/SearchInputView.kt
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The tests advanced past the expected interval with a margin, so a shorter debounce passed them too. Advance to the interval, assert nothing ran, then run the work scheduled at it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The padded-query test pinned only the debounce period, so dropping the trim on the outbound request went unnoticed. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Goal
Message search, the XML search input and the add-members user search send a query as typed, from the first character. Queries of 1-2 characters match a large portion of the data set, so they are the slowest ones to serve and some of them time out, while they are usually just a step towards the query the user is after. Debounce them for at least 500ms instead of the configured 300ms, matching iOS (stream-chat-swift#4198).
Closes AND-1409
Implementation
SearchDebouncein ui-common, marked@InternalStreamChatApisince the thresholds are not meant to be configured by integrators: 500ms up to 2 characters, the configured debounce from 3 on, and never shorter than the configured one. No public API changes, the API dumps are untouched.Debouncer: internalsubmit/submitSuspendableoverloads taking the debounce period for a single piece of work.ChannelListViewModel, the debounced input listener ofSearchInputView, and the user search inAddMembersViewController.SearchInputView.clear()now cancels a debounce still pending from the last keystroke, which notified the listener with the query being cleared and re-ran the search the user had just dismissed.Channel search is left alone: it only queries from 3 characters on, so it never sends the short autocomplete
queryChannelsthis targets. Mention autocomplete is left alone too, as it queries the members of a single channel.Testing
SearchDebounceTestcovers the thresholds, including a configured debounce longer than 500ms winning for short queries.ChannelListViewModelTest: a 2 character message search reachessearchMessagesonly after 500ms, a 3 character one after 300ms, and asearchDebounceMsabove 500ms is honoured for short queries.AddMembersViewControllerTest: a 2 character query starts no search before 500ms. Reverting the controller to the flat 300ms debounce fails this test.DebouncerTest: the new overloads debounce by the period passed per submission, and a later submission cancels pending work.SearchInputView.clear()fix has no test: ui-components has no Robolectric setup in its unit tests, so there is no harness to drive the view'sTextWatcher.Summary by CodeRabbit