src/main/java/io/reactivex/Observable.java
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final <U> Observable<T> debounce(Function<? super T, ? extends ObservableSource<U>> debounceSelector) {
        ObjectHelper.requireNonNull(debounceSelector, "debounceSelector is null");
        return RxJavaPlugins.onAssembly(new ObservableDebounce<T, U>(this, debounceSelector));
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final <U> Observable<T> debounce(Function<? super T, ? extends ObservableSource<U>> debounceSelector) {
        ObjectHelper.requireNonNull(debounceSelector, "debounceSelector is null");
        return RxJavaPlugins.onAssembly(new ObservableDebounce<T, U>(this, debounceSelector));
    }
@ CheckReturnValue @ SchedulerSupport ( SchedulerSupport . NONE ) public final < U > Observable < T > debounce ( Function < ? super T , ? extends ObservableSource < U > > debounceSelector ) { ObjectHelper . requireNonNull ( debounceSelector , "debounceSelector is null" ) ; return RxJavaPlugins . onAssembly ( new ObservableDebounce < T , U > ( this , debounceSelector ) ) ; }
Returns an Observable that mirrors the source ObservableSource, except that it drops items emitted by the
source ObservableSource that are followed by another item within a computed debounce duration.
<p>
<img width="640" height="425" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/debounce.f.png" alt="">
<p>
The delivery of the item happens on the thread of the first {@code onNext} or {@code onComplete}
signal of the generated {@code ObservableSource} sequence,
which if takes too long, a newer item may arrive from the upstream, causing the
generated sequence to get disposed, which may also interrupt any downstream blocking operation
(yielding an {@code InterruptedException}). It is recommended processing items
that may take long time to be moved to another thread via {@link #observeOn} applied after
{@code debounce} itself.
<dl>
<dt><b>Scheduler:</b></dt>
<dd>This version of {@code debounce} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>

@param <U>
the debounce value type (ignored)
@param debounceSelector
function to retrieve a sequence that indicates the throttle duration for each item
@return an Observable that omits items emitted by the source ObservableSource that are followed by another item
within a computed debounce duration
@see <a href="http://reactivex.io/documentation/operators/debounce.html">ReactiveX operators documentation: Debounce</a>
Returns an Observable that mirrors the source ObservableSource except that it drops items emitted by the source ObservableSource that are followed by another item within a computed debounce duration . <p > <img width = 640 height = 425 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / debounce . f . png alt = > <p > The delivery of the item happens on the thread of the first { @code onNext } or { @code onComplete } signal of the generated { @code ObservableSource } sequence which if takes too long a newer item may arrive from the upstream causing the generated sequence to get disposed which may also interrupt any downstream blocking operation ( yielding an { @code InterruptedException } ) . It is recommended processing items that may take long time to be moved to another thread via { @link #observeOn } applied after { @code debounce } itself . <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > This version of { @code debounce } does not operate by default on a particular { @link Scheduler } . < / dd > < / dl >