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2.x: Add throttleLatest operator (#5979)
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‎src/main/java/io/reactivex/Flowable.java

+152
Original file line numberDiff line numberDiff line change
@@ -15536,6 +15536,158 @@ public final Flowable<T> throttleLast(long intervalDuration, TimeUnit unit, Sche
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return sample(intervalDuration, unit, scheduler);
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}
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/**
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* Throttles items from the upstream {@code Flowable} by first emitting the next
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* item from upstream, then periodically emitting the latest item (if any) when
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* the specified timeout elapses between them.
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* <p>
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* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLatest.png" alt="">
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* <p>
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* Unlike the option with {@link #throttleLatest(long, TimeUnit, boolean)}, the very last item being held back
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* (if any) is not emitted when the upstream completes.
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* <p>
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* If no items were emitted from the upstream during this timeout phase, the next
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* upstream item is emitted immediately and the timeout window starts from then.
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* <dl>
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* <dt><b>Backpressure:</b></dt>
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* <dd>This operator does not support backpressure as it uses time to control data flow.
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* If the downstream is not ready to receive items, a
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* {@link io.reactivex.exceptions.MissingBackpressureException MissingBackpressureException}
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* will be signaled.</dd>
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* <dt><b>Scheduler:</b></dt>
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* <dd>{@code throttleLatest} operates by default on the {@code computation} {@link Scheduler}.</dd>
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* </dl>
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* @param timeout the time to wait after an item emission towards the downstream
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* before trying to emit the latest item from upstream again
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* @param unit the time unit
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* @return the new Flowable instance
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* @since 2.1.14 - experimental
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* @see #throttleLatest(long, TimeUnit, boolean)
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* @see #throttleLatest(long, TimeUnit, Scheduler)
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*/
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@Experimental
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@CheckReturnValue
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@BackpressureSupport(BackpressureKind.ERROR)
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@SchedulerSupport(SchedulerSupport.COMPUTATION)
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public final Flowable<T> throttleLatest(long timeout, TimeUnit unit) {
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return throttleLatest(timeout, unit, Schedulers.computation(), false);
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}
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/**
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* Throttles items from the upstream {@code Flowable} by first emitting the next
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* item from upstream, then periodically emitting the latest item (if any) when
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* the specified timeout elapses between them.
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* <p>
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* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLatest.e.png" alt="">
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* <p>
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* If no items were emitted from the upstream during this timeout phase, the next
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* upstream item is emitted immediately and the timeout window starts from then.
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* <dl>
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* <dt><b>Backpressure:</b></dt>
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* <dd>This operator does not support backpressure as it uses time to control data flow.
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* If the downstream is not ready to receive items, a
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* {@link io.reactivex.exceptions.MissingBackpressureException MissingBackpressureException}
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* will be signaled.</dd>
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* <dt><b>Scheduler:</b></dt>
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* <dd>{@code throttleLatest} operates by default on the {@code computation} {@link Scheduler}.</dd>
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* </dl>
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* @param timeout the time to wait after an item emission towards the downstream
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* before trying to emit the latest item from upstream again
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* @param unit the time unit
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* @param emitLast If {@code true}, the very last item from the upstream will be emitted
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* immediately when the upstream completes, regardless if there is
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* a timeout window active or not. If {@code false}, the very last
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* upstream item is ignored and the flow terminates.
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* @return the new Flowable instance
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* @since 2.1.14 - experimental
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* @see #throttleLatest(long, TimeUnit, Scheduler, boolean)
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*/
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@Experimental
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@CheckReturnValue
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@BackpressureSupport(BackpressureKind.ERROR)
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@SchedulerSupport(SchedulerSupport.COMPUTATION)
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public final Flowable<T> throttleLatest(long timeout, TimeUnit unit, boolean emitLast) {
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return throttleLatest(timeout, unit, Schedulers.computation(), emitLast);
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}
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/**
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* Throttles items from the upstream {@code Flowable} by first emitting the next
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* item from upstream, then periodically emitting the latest item (if any) when
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* the specified timeout elapses between them.
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* <p>
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* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLatest.s.png" alt="">
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* <p>
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* Unlike the option with {@link #throttleLatest(long, TimeUnit, Scheduler, boolean)}, the very last item being held back
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* (if any) is not emitted when the upstream completes.
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* <p>
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* If no items were emitted from the upstream during this timeout phase, the next
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* upstream item is emitted immediately and the timeout window starts from then.
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* <dl>
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* <dt><b>Backpressure:</b></dt>
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* <dd>This operator does not support backpressure as it uses time to control data flow.
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* If the downstream is not ready to receive items, a
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* {@link io.reactivex.exceptions.MissingBackpressureException MissingBackpressureException}
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* will be signaled.</dd>
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* <dt><b>Scheduler:</b></dt>
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* <dd>You specify which {@link Scheduler} this operator will use.</dd>
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* </dl>
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* @param timeout the time to wait after an item emission towards the downstream
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* before trying to emit the latest item from upstream again
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* @param unit the time unit
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* @param scheduler the {@link Scheduler} where the timed wait and latest item
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* emission will be performed
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* @return the new Flowable instance
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* @since 2.1.14 - experimental
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* @see #throttleLatest(long, TimeUnit, Scheduler, boolean)
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*/
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@Experimental
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@CheckReturnValue
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@BackpressureSupport(BackpressureKind.ERROR)
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@SchedulerSupport(SchedulerSupport.CUSTOM)
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public final Flowable<T> throttleLatest(long timeout, TimeUnit unit, Scheduler scheduler) {
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return throttleLatest(timeout, unit, scheduler, false);
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}
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/**
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* Throttles items from the upstream {@code Flowable} by first emitting the next
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* item from upstream, then periodically emitting the latest item (if any) when
15654+
* the specified timeout elapses between them.
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* <p>
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* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLatest.se.png" alt="">
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* <p>
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* If no items were emitted from the upstream during this timeout phase, the next
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* upstream item is emitted immediately and the timeout window starts from then.
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* <dl>
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* <dt><b>Backpressure:</b></dt>
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* <dd>This operator does not support backpressure as it uses time to control data flow.
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* If the downstream is not ready to receive items, a
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* {@link io.reactivex.exceptions.MissingBackpressureException MissingBackpressureException}
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* will be signaled.</dd>
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* <dt><b>Scheduler:</b></dt>
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* <dd>You specify which {@link Scheduler} this operator will use.</dd>
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* </dl>
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* @param timeout the time to wait after an item emission towards the downstream
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* before trying to emit the latest item from upstream again
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* @param unit the time unit
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* @param scheduler the {@link Scheduler} where the timed wait and latest item
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* emission will be performed
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* @param emitLast If {@code true}, the very last item from the upstream will be emitted
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* immediately when the upstream completes, regardless if there is
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* a timeout window active or not. If {@code false}, the very last
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* upstream item is ignored and the flow terminates.
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* @return the new Flowable instance
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* @since 2.1.14 - experimental
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*/
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@Experimental
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@CheckReturnValue
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@BackpressureSupport(BackpressureKind.ERROR)
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@SchedulerSupport(SchedulerSupport.CUSTOM)
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public final Flowable<T> throttleLatest(long timeout, TimeUnit unit, Scheduler scheduler, boolean emitLast) {
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ObjectHelper.requireNonNull(unit, "unit is null");
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ObjectHelper.requireNonNull(scheduler, "scheduler is null");
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return RxJavaPlugins.onAssembly(new FlowableThrottleLatest<T>(this, timeout, unit, scheduler, emitLast));
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}
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/**
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* Returns a Flowable that only emits those items emitted by the source Publisher that are not followed
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* by another emitted item within a specified time window.

‎src/main/java/io/reactivex/Observable.java

+128
Original file line numberDiff line numberDiff line change
@@ -13055,6 +13055,134 @@ public final Observable<T> throttleLast(long intervalDuration, TimeUnit unit, Sc
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return sample(intervalDuration, unit, scheduler);
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}
1305713057

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/**
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* Throttles items from the upstream {@code Observable} by first emitting the next
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* item from upstream, then periodically emitting the latest item (if any) when
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* the specified timeout elapses between them.
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* <p>
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* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLatest.png" alt="">
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* <p>
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* Unlike the option with {@link #throttleLatest(long, TimeUnit, boolean)}, the very last item being held back
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* (if any) is not emitted when the upstream completes.
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* <p>
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* If no items were emitted from the upstream during this timeout phase, the next
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* upstream item is emitted immediately and the timeout window starts from then.
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* <dl>
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* <dt><b>Scheduler:</b></dt>
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* <dd>{@code throttleLatest} operates by default on the {@code computation} {@link Scheduler}.</dd>
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* </dl>
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* @param timeout the time to wait after an item emission towards the downstream
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* before trying to emit the latest item from upstream again
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* @param unit the time unit
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* @return the new Observable instance
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* @since 2.1.14 - experimental
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* @see #throttleLatest(long, TimeUnit, boolean)
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* @see #throttleLatest(long, TimeUnit, Scheduler)
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*/
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@Experimental
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@CheckReturnValue
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@SchedulerSupport(SchedulerSupport.COMPUTATION)
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public final Observable<T> throttleLatest(long timeout, TimeUnit unit) {
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return throttleLatest(timeout, unit, Schedulers.computation(), false);
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}
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/**
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* Throttles items from the upstream {@code Observable} by first emitting the next
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* item from upstream, then periodically emitting the latest item (if any) when
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* the specified timeout elapses between them.
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* <p>
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* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLatest.e.png" alt="">
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* <p>
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* If no items were emitted from the upstream during this timeout phase, the next
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* upstream item is emitted immediately and the timeout window starts from then.
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* <dl>
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* <dt><b>Scheduler:</b></dt>
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* <dd>{@code throttleLatest} operates by default on the {@code computation} {@link Scheduler}.</dd>
13101+
* </dl>
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* @param timeout the time to wait after an item emission towards the downstream
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* before trying to emit the latest item from upstream again
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* @param unit the time unit
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* @param emitLast If {@code true}, the very last item from the upstream will be emitted
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* immediately when the upstream completes, regardless if there is
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* a timeout window active or not. If {@code false}, the very last
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* upstream item is ignored and the flow terminates.
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* @return the new Observable instance
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* @since 2.1.14 - experimental
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* @see #throttleLatest(long, TimeUnit, Scheduler, boolean)
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*/
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@Experimental
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@CheckReturnValue
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@SchedulerSupport(SchedulerSupport.COMPUTATION)
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public final Observable<T> throttleLatest(long timeout, TimeUnit unit, boolean emitLast) {
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return throttleLatest(timeout, unit, Schedulers.computation(), emitLast);
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}
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/**
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* Throttles items from the upstream {@code Observable} by first emitting the next
13122+
* item from upstream, then periodically emitting the latest item (if any) when
13123+
* the specified timeout elapses between them.
13124+
* <p>
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* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLatest.s.png" alt="">
13126+
* <p>
13127+
* Unlike the option with {@link #throttleLatest(long, TimeUnit, Scheduler, boolean)}, the very last item being held back
13128+
* (if any) is not emitted when the upstream completes.
13129+
* <p>
13130+
* If no items were emitted from the upstream during this timeout phase, the next
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* upstream item is emitted immediately and the timeout window starts from then.
13132+
* <dl>
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* <dt><b>Scheduler:</b></dt>
13134+
* <dd>You specify which {@link Scheduler} this operator will use.</dd>
13135+
* </dl>
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* @param timeout the time to wait after an item emission towards the downstream
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* before trying to emit the latest item from upstream again
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* @param unit the time unit
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* @param scheduler the {@link Scheduler} where the timed wait and latest item
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* emission will be performed
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* @return the new Observable instance
13142+
* @since 2.1.14 - experimental
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* @see #throttleLatest(long, TimeUnit, Scheduler, boolean)
13144+
*/
13145+
@Experimental
13146+
@CheckReturnValue
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@SchedulerSupport(SchedulerSupport.CUSTOM)
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public final Observable<T> throttleLatest(long timeout, TimeUnit unit, Scheduler scheduler) {
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return throttleLatest(timeout, unit, scheduler, false);
13150+
}
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13152+
/**
13153+
* Throttles items from the upstream {@code Observable} by first emitting the next
13154+
* item from upstream, then periodically emitting the latest item (if any) when
13155+
* the specified timeout elapses between them.
13156+
* <p>
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* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLatest.se.png" alt="">
13158+
* <p>
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* If no items were emitted from the upstream during this timeout phase, the next
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* upstream item is emitted immediately and the timeout window starts from then.
13161+
* <dl>
13162+
* <dt><b>Scheduler:</b></dt>
13163+
* <dd>You specify which {@link Scheduler} this operator will use.</dd>
13164+
* </dl>
13165+
* @param timeout the time to wait after an item emission towards the downstream
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* before trying to emit the latest item from upstream again
13167+
* @param unit the time unit
13168+
* @param scheduler the {@link Scheduler} where the timed wait and latest item
13169+
* emission will be performed
13170+
* @param emitLast If {@code true}, the very last item from the upstream will be emitted
13171+
* immediately when the upstream completes, regardless if there is
13172+
* a timeout window active or not. If {@code false}, the very last
13173+
* upstream item is ignored and the flow terminates.
13174+
* @return the new Observable instance
13175+
* @since 2.1.14 - experimental
13176+
*/
13177+
@Experimental
13178+
@CheckReturnValue
13179+
@SchedulerSupport(SchedulerSupport.CUSTOM)
13180+
public final Observable<T> throttleLatest(long timeout, TimeUnit unit, Scheduler scheduler, boolean emitLast) {
13181+
ObjectHelper.requireNonNull(unit, "unit is null");
13182+
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
13183+
return RxJavaPlugins.onAssembly(new ObservableThrottleLatest<T>(this, timeout, unit, scheduler, emitLast));
13184+
}
13185+
1305813186
/**
1305913187
* Returns an Observable that only emits those items emitted by the source ObservableSource that are not followed
1306013188
* by another emitted item within a specified time window.

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