reactor-core/src/main/java/reactor/core/publisher/Operators.java
public static <T> Subscription scalarSubscription(CoreSubscriber<? super T> subscriber,
			T value){
		return new ScalarSubscription<>(subscriber, value);
	}
public static <T> Subscription scalarSubscription(CoreSubscriber<? super T> subscriber,
			T value){
		return new ScalarSubscription<>(subscriber, value);
	}
Represents a fuseable Subscription that emits a single constant value synchronously
to a Subscriber or consumer.

@param subscriber the delegate {@link Subscriber} that will be requesting the value
@param value the single value to be emitted
@param <T> the value type
@return a new scalar {@link Subscription}