@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Completable doOnSubscribe(Consumer<? super Disposable> onSubscribe) {
    """
	Returns a Completable instance that calls the given onSubscribe callback with the disposable
	that child subscribers receive on subscription.
	<p>
	<img width="640" height="304" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.doOnSubscribe.png" alt="">
	<dl>
	<dt><b>Scheduler:</b></dt>
	<dd>{@code doOnSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
	</dl>
	@param onSubscribe the callback called when a child subscriber subscribes
	@return the new Completable instance
	@throws NullPointerException if onSubscribe is null
    """
        return doOnLifecycle(onSubscribe, Functions.emptyConsumer(),
                Functions.EMPTY_ACTION, Functions.EMPTY_ACTION,
                Functions.EMPTY_ACTION, Functions.EMPTY_ACTION);
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Completable doOnSubscribe(Consumer<? super Disposable> onSubscribe) {
        return doOnLifecycle(onSubscribe, Functions.emptyConsumer(),
                Functions.EMPTY_ACTION, Functions.EMPTY_ACTION,
                Functions.EMPTY_ACTION, Functions.EMPTY_ACTION);
    }
@ CheckReturnValue @ SchedulerSupport ( SchedulerSupport . NONE ) public final Completable doOnSubscribe ( Consumer < ? super Disposable > onSubscribe ) { return doOnLifecycle ( onSubscribe , Functions . emptyConsumer ( ) , Functions . EMPTY_ACTION , Functions . EMPTY_ACTION , Functions . EMPTY_ACTION , Functions . EMPTY_ACTION ) ; }
Returns a Completable instance that calls the given onSubscribe callback with the disposable
that child subscribers receive on subscription.
<p>
<img width="640" height="304" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.doOnSubscribe.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>{@code doOnSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
@param onSubscribe the callback called when a child subscriber subscribes
@return the new Completable instance
@throws NullPointerException if onSubscribe is null
Returns a Completable instance that calls the given onSubscribe callback with the disposable that child subscribers receive on subscription . <p > <img width = 640 height = 304 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / Completable . doOnSubscribe . png alt = > <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > {