kotlin-coroutines
Kotlin coroutines - structured concurrency, Flows, exception handling
Kotlin coroutines - structured concurrency, Flows, exception handling
Kotlin Coroutines Skill
Master asynchronous programming with structured concurrency.
Topics Covered
Structured Concurrency
// ✅ Structured - cancellation propagates
class Repository(private val scope: CoroutineScope) {
suspend fun load() = withContext(Dispatchers.IO) { fetch() }
}
// ❌ Avoid GlobalScope
GlobalScope.launch { /* leaks */ }
Exception Handling
suspend fun loadData() = supervisorScope {
val a = async { fetchA() }
val b = async { fetchB() }
Result(a.awaitOrNull(), b.awaitOrNull())
}
// Never swallow CancellationException
catch (e: Exception) {
if (e is CancellationException) throw e
}
Testing
@Test
fun test() = runTest {
val vm = ViewModel(testDispatcher)
vm.load()
advanceUntilIdle()
assertThat(vm.state.value.data).isNotNull()
}
Troubleshooting
| Issue | Resolution |
|---|---|
| Coroutine leak | Use structured scopes, not GlobalScope |
| Test hangs | Inject TestDispatcher, use advanceUntilIdle() |
Usage
Skill("kotlin-coroutines")
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