review-case

name: review-case description: > Review an existing case implementation against project-specific red lines and coding standards. Use after implementing or modifying a case. Use when: reviewing a Compose case for correctness, checking red-line compliance, verifying lifecycle and state patterns, auditing an existing Composable. Keywords: review, audit, check, red lines, lifecycle, state, compliance, Compose.

Review Case — APIExample-Compose

Run through every item below before considering a case implementation complete. Open the case's Composable source file and verify each point against the actual code.

Checklist

Teardown & Lifecycle

• leaveChannel before destroy in onDispose — engine.leaveChannel() is called before RtcEngine.destroy() in the onDispose block. Destroying without leaving first leaks the channel session on the server side.

• DisposableEffect key is lifecycleOwner not Unit — DisposableEffect(lifecycleOwner) not DisposableEffect(Unit). Using Unit fires only once and won't clean up on back navigation; the onDispose block never re-executes when the lifecycle owner changes.

State Management

• rememberSaveable for channelName/isJoined/uid and remember for RtcEngine — channelName, isJoined, uid use rememberSaveable; RtcEngine uses remember. rememberSaveable survives configuration changes (rotation); RtcEngine is not serializable and will crash if placed in rememberSaveable.

Threading

• Callbacks dispatch to main thread via coroutineScope.launch(Dispatchers.Main) — IRtcEngineEventHandler callbacks that show Toast, Dialog, or AlertDialog dispatch to the main thread via coroutineScope.launch(Dispatchers.Main). SDK callbacks arrive on a background thread; Toast and dialog APIs require the main thread or they throw CalledFromWrongThreadException. Note: simple Compose state mutations (e.g. isJoined = true) are thread-safe via the snapshot system and do not need main-thread dispatch.

Permissions

• Permission check before joinChannel — Permission launcher (rememberLauncherForActivityResult) is called before joinChannel(). Joining without the required permissions (RECORD_AUDIO, and CAMERA for video cases) causes a silent failure — no error callback, just no audio/video.

If a Check Fails

• DisposableEffect(Unit) is used — change key to lifecycleOwner, then verify back navigation triggers cleanup.
• RtcEngine stored in rememberSaveable or state fields in remember only — fix to RtcEngine -> remember, UI/session state -> rememberSaveable, then verify rotation.
• Toast/Dialog shown directly in callback — move UI-thread-only calls into coroutineScope.launch(Dispatchers.Main).
• Permission launcher bypassed before joinChannel() — gate join flow behind permission callback and re-test denied/granted paths.

NEVER

• NEVER approve a review when DisposableEffect key is Unit for case teardown logic.
• NEVER approve a review when RtcEngine uses rememberSaveable.
• NEVER treat Compose callback state safety as permission to call Toast/Dialog off main thread.
• NEVER skip rotation and back-navigation checks for lifecycle-sensitive Compose cases.