How to use

SingleDelayWithSingle

in

io.reactivex.internal.operators.single

/**
 * Delays the actual subscription to the current Single until the given other SingleSource
 * signals success.
 * <p>If the delaying source signals an error, that error is re-emitted and no subscription
 * to the current Single happens.
 * <dl>
 * <dt><b>Scheduler:</b></dt>
 * <dd>{@code delaySubscription} does not operate by default on a particular {@link Scheduler}.</dd>
 * </dl>
 * @param <U> the element type of the other source
 * @param other the SingleSource that has to complete before the subscription to the
 *              current Single happens
 * @return the new Single instance
 * @since 2.0
 */
@CheckReturnValue
@NonNull
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Single<T> delaySubscription(SingleSource<U> other) {
  ObjectHelper.requireNonNull(other, "other is null");
  return RxJavaPlugins.onAssembly(new SingleDelayWithSingle<T, U>(this, other));
}

/**
 * Delays the actual subscription to the current Single until the given other SingleSource
 * signals success.
 * <p>If the delaying source signals an error, that error is re-emitted and no subscription
 * to the current Single happens.
 * <dl>
 * <dt><b>Scheduler:</b></dt>
 * <dd>{@code delaySubscription} does not operate by default on a particular {@link Scheduler}.</dd>
 * </dl>
 * @param <U> the element type of the other source
 * @param other the SingleSource that has to complete before the subscription to the
 *              current Single happens
 * @return the new Single instance
 * @since 2.0
 */
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Single<T> delaySubscription(SingleSource<U> other) {
  ObjectHelper.requireNonNull(other, "other is null");
  return RxJavaPlugins.onAssembly(new SingleDelayWithSingle<T, U>(this, other));
}