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kotlinx.coroutines v1.1.0-alpha Release Notes

  • ✅ Major improvements in coroutines testing and debugging

    • 🆕 New module: kotlinx-coroutines-debug. Debug agent that improves coroutines stacktraces, allows to print all active coroutines and its hierarchies and can be installed as Java agent.
    • 🆕 New module: kotlinx-coroutines-test. Allows setting arbitrary Dispatchers.Main implementation for tests (#810).
    • 👻 Stacktrace recovery mechanism. Exceptions from coroutines are recovered from current coroutine stacktraces to simplify exception diagnostic. Enabled in debug mode, controlled by kotlinx.coroutines.debug system property (#493).

    Other improvements

    • MainScope factory and CoroutineScope.cancel extension (#829). One line CoroutineScope integration!
    • 👻 CancellableContinuation race between resumeWithException and cancel is addressed, exceptions during cancellation are no longer reported to exception handler (#830, #892).
    • 0️⃣ Dispatchers.Default now consumes much less CPU on JVM (#840).
    • 👍 Better diagnostic and fast failure if an uninitialized dispatcher is used (#880).
    • Conflated channel becomes linearizable.
    • 🛠 Fixed inconsistent coroutines state when the result of the coroutine had type DisposableHandle (#835).
    • 🛠 Fixed JavaFx initialization bug (#816).
    • ⏱ TimeoutCancellationException is thrown by withTimeout instead of CancellationException if negative timeout is supplied (#870).
    • 👷 Kotlin/Native single-threaded workers support: coroutines can be safely used in multiple independent K/N workers.
    • 0️⃣ jsdom support in Dispatchers.Default on JS.
    • rxFlowable generic parameter is now restricted with Any.
    • 👍 Guava 27 support in kotlinx-coroutines-guava.
    • Coroutines are now built with progressive mode.
    • 📚 Various fixes in the documentation.