reactor-core/src/main/java/reactor/core/publisher/ParallelFlux.java
public final ParallelFlux<T> doOnComplete(Runnable onComplete) {
		Objects.requireNonNull(onComplete, "onComplete");
		return doOnSignal(this, null, null, null, onComplete, null, null, null, null);
	}
public final ParallelFlux<T> doOnComplete(Runnable onComplete) {
		Objects.requireNonNull(onComplete, "onComplete");
		return doOnSignal(this, null, null, null, onComplete, null, null, null, null);
	}
Run the specified runnable when a 'rail' completes.

@param onComplete the callback

@return the new {@link ParallelFlux} instance