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Kotlin Coroutines & Flow logo

Kotlin Coroutines & Flow

Structured Concurrency, Flow patterns, and Asynchronous programming standards.

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SKILL.md

Full skill instructions

Kotlin Coroutines & Flow

Priority: P1 (HIGH)

Standard for safe, structured asynchronous programming.

Implementation Guidelines

  • Structured Concurrency: Always launch coroutines within a CoroutineScope (e.g., viewModelScope, lifecycleScope). Never use GlobalScope.
  • Dispatchers: Inject DispatcherProvider or CoroutineDispatcher to simplify testing. Do not hardcode Dispatchers.IO in classes.
  • Suspend Functions: Mark blocking/​long-running operations as suspend. They should be "main-safe" (handle their own context switching).
  • Flow: Prefer StateFlow (state holder) and SharedFlow (events) over LiveData.
  • Collection: Use collectLatest for restartable upstream updates. Use flowWithLifecycle in UI.
  • Error Handling: Use CoroutineExceptionHandler for top-level launch, try/​catch for code blocks within coroutines.

Anti-Patterns

  • GlobalScope: Leaks memory and breaks structure.
  • Blocking Calls: Never use Thread.sleep or blocking I/​O in coroutines. Use delay or proper suspend functions.
  • Async/​Await Abuse: Don't use async unless you need parallel execution. Use linear code in launch.
  • Mutable State in Flow: Don't expose MutableStateFlow publicly. Cast to StateFlow.

Code

For detailed ViewModel + StateFlow and Parallel Async examples: references/​advanced-patterns.md

// Structured Scope + Main-safe Suspend
viewModelScope.launch {
    val data = withContext(Dispatchers.IO) { repo.fetch() }
    _state.value = UiState.Success(data)
}

Related Topics

best-practices | language | android

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