/**
* 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.flowable;
import java.util.*;
import java.util.concurrent.TimeUnit;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.Scheduler.Worker;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.MissingBackpressureException;
import io.reactivex.internal.disposables.*;
import io.reactivex.internal.fuseable.SimplePlainQueue;
import io.reactivex.internal.queue.MpscLinkedQueue;
import io.reactivex.internal.subscribers.QueueDrainSubscriber;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.internal.util.NotificationLite;
import io.reactivex.processors.UnicastProcessor;
import io.reactivex.subscribers.SerializedSubscriber;
public final class FlowableWindowTimed<T> extends AbstractFlowableWithUpstream<T, Flowable<T>> {
final long timespan;
final long timeskip;
final TimeUnit unit;
final Scheduler scheduler;
final long maxSize;
final int bufferSize;
final boolean restartTimerOnMaxSize;
public FlowableWindowTimed(Flowable<T> source,
long timespan, long timeskip, TimeUnit unit, Scheduler scheduler, long maxSize,
int bufferSize, boolean restartTimerOnMaxSize) {
super(source);
this.timespan = timespan;
this.timeskip = timeskip;
this.unit = unit;
this.scheduler = scheduler;
this.maxSize = maxSize;
this.bufferSize = bufferSize;
this.restartTimerOnMaxSize = restartTimerOnMaxSize;
}
@Override
protected void subscribeActual(Subscriber<? super Flowable<T>> s) {
SerializedSubscriber<Flowable<T>> actual = new SerializedSubscriber<Flowable<T>>(s);
if (timespan == timeskip) {
if (maxSize == Long.MAX_VALUE) {
source.subscribe(new WindowExactUnboundedSubscriber<T>(
actual,
timespan, unit, scheduler, bufferSize));
return;
}
source.subscribe(new WindowExactBoundedSubscriber<T>(
actual,
timespan, unit, scheduler,
bufferSize, maxSize, restartTimerOnMaxSize));
return;
}
source.subscribe(new WindowSkipSubscriber<T>(actual,
timespan, timeskip, unit, scheduler.createWorker(), bufferSize));
}
static final class WindowExactUnboundedSubscriber<T>
extends QueueDrainSubscriber<T, Object, Flowable<T>>
implements FlowableSubscriber<T>, Subscription, Runnable {
final long timespan;
final TimeUnit unit;
final Scheduler scheduler;
final int bufferSize;
Subscription s;
UnicastProcessor<T> window;
final SequentialDisposable timer = new SequentialDisposable();
static final Object NEXT = new Object();
volatile boolean terminated;
WindowExactUnboundedSubscriber(Subscriber<? super Flowable<T>> actual, long timespan, TimeUnit unit,
Scheduler scheduler, int bufferSize) {
super(actual, new MpscLinkedQueue<Object>());
this.timespan = timespan;
this.unit = unit;
this.scheduler = scheduler;
this.bufferSize = bufferSize;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.s, s)) {
this.s = s;
window = UnicastProcessor.<T>create(bufferSize);
Subscriber<? super Flowable<T>> a = actual;
a.onSubscribe(this);
long r = requested();
if (r != 0L) {
a.onNext(window);
if (r != Long.MAX_VALUE) {
produced(1);
}
} else {
cancelled = true;
s.cancel();
a.onError(new MissingBackpressureException("Could not deliver first window due to lack of requests."));
return;
}
if (!cancelled) {
if (timer.replace(scheduler.schedulePeriodicallyDirect(this, timespan, timespan, unit))) {
s.request(Long.MAX_VALUE);
}
}
}
}
@Override
public void onNext(T t) {
if (terminated) {
return;
}
if (fastEnter()) {
window.onNext(t);
if (leave(-1) == 0) {
return;
}
} else {
queue.offer(NotificationLite.next(t));
if (!enter()) {
return;
}
}
drainLoop();
}
@Override
public void onError(Throwable t) {
error = t;
done = true;
if (enter()) {
drainLoop();
}
actual.onError(t);
dispose();
}
@Override
public void onComplete() {
done = true;
if (enter()) {
drainLoop();
}
actual.onComplete();
dispose();
}
@Override
public void request(long n) {
requested(n);
}
@Override
public void cancel() {
cancelled = true;
}
public void dispose() {
DisposableHelper.dispose(timer);
}
@Override
public void run() {
if (cancelled) {
terminated = true;
dispose();
}
queue.offer(NEXT);
if (enter()) {
drainLoop();
}
}
void drainLoop() {
final SimplePlainQueue<Object> q = queue;
final Subscriber<? super Flowable<T>> a = actual;
UnicastProcessor<T> w = window;
int missed = 1;
for (;;) {
for (;;) {
boolean term = terminated; // NOPMD
boolean d = done;
Object o = q.poll();
if (d && (o == null || o == NEXT)) {
window = null;
q.clear();
dispose();
Throwable err = error;
if (err != null) {
w.onError(err);
} else {
w.onComplete();
}
return;
}
if (o == null) {
break;
}
if (o == NEXT) {
w.onComplete();
if (!term) {
w = UnicastProcessor.<T>create(bufferSize);
window = w;
long r = requested();
if (r != 0L) {
a.onNext(w);
if (r != Long.MAX_VALUE) {
produced(1);
}
} else {
window = null;
queue.clear();
s.cancel();
dispose();
a.onError(new MissingBackpressureException("Could not deliver first window due to lack of requests."));
return;
}
} else {
s.cancel();
}
continue;
}
w.onNext(NotificationLite.<T>getValue(o));
}
missed = leave(-missed);
if (missed == 0) {
break;
}
}
}
}
static final class WindowExactBoundedSubscriber<T>
extends QueueDrainSubscriber<T, Object, Flowable<T>>
implements Subscription {
final long timespan;
final TimeUnit unit;
final Scheduler scheduler;
final int bufferSize;
final boolean restartTimerOnMaxSize;
final long maxSize;
final Scheduler.Worker worker;
long count;
long producerIndex;
Subscription s;
UnicastProcessor<T> window;
volatile boolean terminated;
final SequentialDisposable timer = new SequentialDisposable();
WindowExactBoundedSubscriber(
Subscriber<? super Flowable<T>> actual,
long timespan, TimeUnit unit, Scheduler scheduler,
int bufferSize, long maxSize, boolean restartTimerOnMaxSize) {
super(actual, new MpscLinkedQueue<Object>());
this.timespan = timespan;
this.unit = unit;
this.scheduler = scheduler;
this.bufferSize = bufferSize;
this.maxSize = maxSize;
this.restartTimerOnMaxSize = restartTimerOnMaxSize;
if (restartTimerOnMaxSize) {
worker = scheduler.createWorker();
} else {
worker = null;
}
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.s, s)) {
this.s = s;
Subscriber<? super Flowable<T>> a = actual;
a.onSubscribe(this);
if (cancelled) {
return;
}
UnicastProcessor<T> w = UnicastProcessor.<T>create(bufferSize);
window = w;
long r = requested();
if (r != 0L) {
a.onNext(w);
if (r != Long.MAX_VALUE) {
produced(1);
}
} else {
cancelled = true;
s.cancel();
a.onError(new MissingBackpressureException("Could not deliver initial window due to lack of requests."));
return;
}
Disposable d;
ConsumerIndexHolder consumerIndexHolder = new ConsumerIndexHolder(producerIndex, this);
if (restartTimerOnMaxSize) {
d = worker.schedulePeriodically(consumerIndexHolder, timespan, timespan, unit);
} else {
d = scheduler.schedulePeriodicallyDirect(consumerIndexHolder, timespan, timespan, unit);
}
if (timer.replace(d)) {
s.request(Long.MAX_VALUE);
}
}
}
@Override
public void onNext(T t) {
if (terminated) {
return;
}
if (fastEnter()) {
UnicastProcessor<T> w = window;
w.onNext(t);
long c = count + 1;
if (c >= maxSize) {
producerIndex++;
count = 0;
w.onComplete();
long r = requested();
if (r != 0L) {
w = UnicastProcessor.<T>create(bufferSize);
window = w;
actual.onNext(w);
if (r != Long.MAX_VALUE) {
produced(1);
}
if (restartTimerOnMaxSize) {
Disposable tm = timer.get();
tm.dispose();
Disposable task = worker.schedulePeriodically(
new ConsumerIndexHolder(producerIndex, this), timespan, timespan, unit);
if (!timer.compareAndSet(tm, task)) {
task.dispose();
}
}
} else {
window = null;
s.cancel();
actual.onError(new MissingBackpressureException("Could not deliver window due to lack of requests"));
dispose();
return;
}
} else {
count = c;
}
if (leave(-1) == 0) {
return;
}
} else {
queue.offer(NotificationLite.next(t));
if (!enter()) {
return;
}
}
drainLoop();
}
@Override
public void onError(Throwable t) {
error = t;
done = true;
if (enter()) {
drainLoop();
}
actual.onError(t);
dispose();
}
@Override
public void onComplete() {
done = true;
if (enter()) {
drainLoop();
}
actual.onComplete();
dispose();
}
@Override
public void request(long n) {
requested(n);
}
@Override
public void cancel() {
cancelled = true;
}
public void dispose() {
DisposableHelper.dispose(timer);
Worker w = worker;
if (w != null) {
w.dispose();
}
}
void drainLoop() {
final SimplePlainQueue<Object> q = queue;
final Subscriber<? super Flowable<T>> a = actual;
UnicastProcessor<T> w = window;
int missed = 1;
for (;;) {
for (;;) {
if (terminated) {
s.cancel();
q.clear();
dispose();
return;
}
boolean d = done;
Object o = q.poll();
boolean empty = o == null;
boolean isHolder = o instanceof ConsumerIndexHolder;
if (d && (empty || isHolder)) {
window = null;
q.clear();
Throwable err = error;
if (err != null) {
w.onError(err);
} else {
w.onComplete();
}
dispose();
return;
}
if (empty) {
break;
}
if (isHolder) {
ConsumerIndexHolder consumerIndexHolder = (ConsumerIndexHolder) o;
if (restartTimerOnMaxSize || producerIndex == consumerIndexHolder.index) {
w.onComplete();
count = 0;
w = UnicastProcessor.<T>create(bufferSize);
window = w;
long r = requested();
if (r != 0L) {
a.onNext(w);
if (r != Long.MAX_VALUE) {
produced(1);
}
} else {
window = null;
queue.clear();
s.cancel();
a.onError(new MissingBackpressureException("Could not deliver first window due to lack of requests."));
dispose();
return;
}
}
continue;
}
w.onNext(NotificationLite.<T>getValue(o));
long c = count + 1;
if (c >= maxSize) {
producerIndex++;
count = 0;
w.onComplete();
long r = requested();
if (r != 0L) {
w = UnicastProcessor.<T>create(bufferSize);
window = w;
actual.onNext(w);
if (r != Long.MAX_VALUE) {
produced(1);
}
if (restartTimerOnMaxSize) {
Disposable tm = timer.get();
tm.dispose();
Disposable task = worker.schedulePeriodically(
new ConsumerIndexHolder(producerIndex, this), timespan, timespan, unit);
if (!timer.compareAndSet(tm, task)) {
task.dispose();
}
}
} else {
window = null;
s.cancel();
actual.onError(new MissingBackpressureException("Could not deliver window due to lack of requests"));
dispose();
return;
}
} else {
count = c;
}
}
missed = leave(-missed);
if (missed == 0) {
break;
}
}
}
static final class ConsumerIndexHolder implements Runnable {
final long index;
final WindowExactBoundedSubscriber<?> parent;
ConsumerIndexHolder(long index, WindowExactBoundedSubscriber<?> parent) {
this.index = index;
this.parent = parent;
}
@Override
public void run() {
WindowExactBoundedSubscriber<?> p = parent;
if (!p.cancelled) {
p.queue.offer(this);
} else {
p.terminated = true;
p.dispose();
}
if (p.enter()) {
p.drainLoop();
}
}
}
}
static final class WindowSkipSubscriber<T>
extends QueueDrainSubscriber<T, Object, Flowable<T>>
implements Subscription, Runnable {
final long timespan;
final long timeskip;
final TimeUnit unit;
final Scheduler.Worker worker;
final int bufferSize;
final List<UnicastProcessor<T>> windows;
Subscription s;
volatile boolean terminated;
WindowSkipSubscriber(Subscriber<? super Flowable<T>> actual,
long timespan, long timeskip, TimeUnit unit,
Worker worker, int bufferSize) {
super(actual, new MpscLinkedQueue<Object>());
this.timespan = timespan;
this.timeskip = timeskip;
this.unit = unit;
this.worker = worker;
this.bufferSize = bufferSize;
this.windows = new LinkedList<UnicastProcessor<T>>();
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
if (cancelled) {
return;
}
long r = requested();
if (r != 0L) {
final UnicastProcessor<T> w = UnicastProcessor.<T>create(bufferSize);
windows.add(w);
actual.onNext(w);
if (r != Long.MAX_VALUE) {
produced(1);
}
worker.schedule(new Completion(w), timespan, unit);
worker.schedulePeriodically(this, timeskip, timeskip, unit);
s.request(Long.MAX_VALUE);
} else {
s.cancel();
actual.onError(new MissingBackpressureException("Could not emit the first window due to lack of requests"));
}
}
}
@Override
public void onNext(T t) {
if (fastEnter()) {
for (UnicastProcessor<T> w : windows) {
w.onNext(t);
}
if (leave(-1) == 0) {
return;
}
} else {
queue.offer(t);
if (!enter()) {
return;
}
}
drainLoop();
}
@Override
public void onError(Throwable t) {
error = t;
done = true;
if (enter()) {
drainLoop();
}
actual.onError(t);
dispose();
}
@Override
public void onComplete() {
done = true;
if (enter()) {
drainLoop();
}
actual.onComplete();
dispose();
}
@Override
public void request(long n) {
requested(n);
}
@Override
public void cancel() {
cancelled = true;
}
public void dispose() {
worker.dispose();
}
void complete(UnicastProcessor<T> w) {
queue.offer(new SubjectWork<T>(w, false));
if (enter()) {
drainLoop();
}
}
@SuppressWarnings("unchecked")
void drainLoop() {
final SimplePlainQueue<Object> q = queue;
final Subscriber<? super Flowable<T>> a = actual;
final List<UnicastProcessor<T>> ws = windows;
int missed = 1;
for (;;) {
for (;;) {
if (terminated) {
s.cancel();
dispose();
q.clear();
ws.clear();
return;
}
boolean d = done;
Object v = q.poll();
boolean empty = v == null;
boolean sw = v instanceof SubjectWork;
if (d && (empty || sw)) {
q.clear();
Throwable e = error;
if (e != null) {
for (UnicastProcessor<T> w : ws) {
w.onError(e);
}
} else {
for (UnicastProcessor<T> w : ws) {
w.onComplete();
}
}
ws.clear();
dispose();
return;
}
if (empty) {
break;
}
if (sw) {
SubjectWork<T> work = (SubjectWork<T>)v;
if (work.open) {
if (cancelled) {
continue;
}
long r = requested();
if (r != 0L) {
final UnicastProcessor<T> w = UnicastProcessor.<T>create(bufferSize);
ws.add(w);
a.onNext(w);
if (r != Long.MAX_VALUE) {
produced(1);
}
worker.schedule(new Completion(w), timespan, unit);
} else {
a.onError(new MissingBackpressureException("Can't emit window due to lack of requests"));
}
} else {
ws.remove(work.w);
work.w.onComplete();
if (ws.isEmpty() && cancelled) {
terminated = true;
}
}
} else {
for (UnicastProcessor<T> w : ws) {
w.onNext((T)v);
}
}
}
missed = leave(-missed);
if (missed == 0) {
break;
}
}
}
@Override
public void run() {
UnicastProcessor<T> w = UnicastProcessor.<T>create(bufferSize);
SubjectWork<T> sw = new SubjectWork<T>(w, true);
if (!cancelled) {
queue.offer(sw);
}
if (enter()) {
drainLoop();
}
}
static final class SubjectWork<T> {
final UnicastProcessor<T> w;
final boolean open;
SubjectWork(UnicastProcessor<T> w, boolean open) {
this.w = w;
this.open = open;
}
}
final class Completion implements Runnable {
private final UnicastProcessor<T> processor;
Completion(UnicastProcessor<T> processor) {
this.processor = processor;
}
@Override
public void run() {
complete(processor);
}
}
}
}