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/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
 * the License for the specific language governing permissions and limitations under the License.
 */

package io.reactivex.internal.operators.observable;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.*;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;

/**
 * Emits the next or latest item when the given time elapses.
 * 

* The operator emits the next item, then starts a timer. When the timer fires, * it tries to emit the latest item from upstream. If there was no upstream item, * in the meantime, the next upstream item is emitted immediately and the * timed process repeats. *

History: 2.1.14 - experimental * @param the upstream and downstream value type * @since 2.2 */ public final class ObservableThrottleLatest extends AbstractObservableWithUpstream { final long timeout; final TimeUnit unit; final Scheduler scheduler; final boolean emitLast; public ObservableThrottleLatest(Observable source, long timeout, TimeUnit unit, Scheduler scheduler, boolean emitLast) { super(source); this.timeout = timeout; this.unit = unit; this.scheduler = scheduler; this.emitLast = emitLast; } @Override protected void subscribeActual(Observer observer) { source.subscribe(new ThrottleLatestObserver(observer, timeout, unit, scheduler.createWorker(), emitLast)); } static final class ThrottleLatestObserver extends AtomicInteger implements Observer, Disposable, Runnable { private static final long serialVersionUID = -8296689127439125014L; final Observer downstream; final long timeout; final TimeUnit unit; final Scheduler.Worker worker; final boolean emitLast; final AtomicReference latest; Disposable upstream; volatile boolean done; Throwable error; volatile boolean cancelled; volatile boolean timerFired; boolean timerRunning; ThrottleLatestObserver(Observer downstream, long timeout, TimeUnit unit, Scheduler.Worker worker, boolean emitLast) { this.downstream = downstream; this.timeout = timeout; this.unit = unit; this.worker = worker; this.emitLast = emitLast; this.latest = new AtomicReference(); } @Override public void onSubscribe(Disposable d) { if (DisposableHelper.validate(upstream, d)) { upstream = d; downstream.onSubscribe(this); } } @Override public void onNext(T t) { latest.set(t); drain(); } @Override public void onError(Throwable t) { error = t; done = true; drain(); } @Override public void onComplete() { done = true; drain(); } @Override public void dispose() { cancelled = true; upstream.dispose(); worker.dispose(); if (getAndIncrement() == 0) { latest.lazySet(null); } } @Override public boolean isDisposed() { return cancelled; } @Override public void run() { timerFired = true; drain(); } void drain() { if (getAndIncrement() != 0) { return; } int missed = 1; AtomicReference latest = this.latest; Observer downstream = this.downstream; for (;;) { for (;;) { if (cancelled) { latest.lazySet(null); return; } boolean d = done; if (d && error != null) { latest.lazySet(null); downstream.onError(error); worker.dispose(); return; } T v = latest.get(); boolean empty = v == null; if (d) { v = latest.getAndSet(null); if (!empty && emitLast) { downstream.onNext(v); } downstream.onComplete(); worker.dispose(); return; } if (empty) { if (timerFired) { timerRunning = false; timerFired = false; } break; } if (!timerRunning || timerFired) { v = latest.getAndSet(null); downstream.onNext(v); timerFired = false; timerRunning = true; worker.schedule(this, timeout, unit); } else { break; } } missed = addAndGet(-missed); if (missed == 0) { break; } } } } }





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