Future

fun onComplete(
	executor: Executor,
	resultCallback: FutureResultCallback<T>,
	errorCallback: FutureErrorCallback
): Unit

fun onComplete(resultCallback: FutureResultCallback<T>, errorCallback: FutureErrorCallback): Unit

fun onResult(executor: Executor, callback: FutureResultCallback<T>): Unit

fun onResult(callback: FutureResultCallback<T>): Unit

fun onError(executor: Executor, callback: FutureErrorCallback): Unit

fun onError(callback: FutureErrorCallback): Unit

suspend fun await(): T