mono
fun <T> mono(context: CoroutineContext = EmptyCoroutineContext, block: suspend CoroutineScope.() -> T?): Mono<T>(source)
Creates a cold mono that runs a given block in a coroutine and emits its result. Every time the returned mono is subscribed, it starts a new coroutine. If the result of block is null, MonoSink.success is invoked without a value. Unsubscribing cancels the running coroutine.
Coroutine context can be specified with context argument. If the context does not have any dispatcher nor any other ContinuationInterceptor, then Dispatchers.Default is used.