Kotlin coroutines - structured concurrency, Flows, exception handling
Handles Kotlin coroutines with structured concurrency, Flows, and proper exception handling. Use when you see GlobalScope usage, need supervisorScope for parallel tasks, or require testDispatcher injection for reliable tests.
/plugin marketplace add pluginagentmarketplace/custom-plugin-kotlin/plugin install kotlin-assistant@pluginagentmarketplace-kotlinThis skill inherits all available tools. When active, it can use any tool Claude has access to.
assets/config.yamlassets/schema.jsonreferences/GUIDE.mdreferences/PATTERNS.mdscripts/validate.pyMaster asynchronous programming with structured concurrency.
// ✅ Structured - cancellation propagates
class Repository(private val scope: CoroutineScope) {
suspend fun load() = withContext(Dispatchers.IO) { fetch() }
}
// ❌ Avoid GlobalScope
GlobalScope.launch { /* leaks */ }
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
}
@Test
fun test() = runTest {
val vm = ViewModel(testDispatcher)
vm.load()
advanceUntilIdle()
assertThat(vm.state.value.data).isNotNull()
}
| Issue | Resolution |
|---|---|
| Coroutine leak | Use structured scopes, not GlobalScope |
| Test hangs | Inject TestDispatcher, use advanceUntilIdle() |
Skill("kotlin-coroutines")
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