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io.reactivex.rxjava3.internal.operators.flowable.FlowableWindowTimed Maven / Gradle / Ivy
/*
* 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.rxjava3.internal.operators.flowable;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.core.Scheduler.Worker;
import io.reactivex.rxjava3.exceptions.MissingBackpressureException;
import io.reactivex.rxjava3.internal.disposables.SequentialDisposable;
import io.reactivex.rxjava3.internal.queue.MpscLinkedQueue;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
import io.reactivex.rxjava3.internal.util.BackpressureHelper;
import io.reactivex.rxjava3.operators.SimplePlainQueue;
import io.reactivex.rxjava3.processors.UnicastProcessor;
public final class FlowableWindowTimed extends AbstractFlowableWithUpstream> {
final long timespan;
final long timeskip;
final TimeUnit unit;
final Scheduler scheduler;
final long maxSize;
final int bufferSize;
final boolean restartTimerOnMaxSize;
public FlowableWindowTimed(Flowable 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> downstream) {
if (timespan == timeskip) {
if (maxSize == Long.MAX_VALUE) {
source.subscribe(new WindowExactUnboundedSubscriber<>(
downstream,
timespan, unit, scheduler, bufferSize));
return;
}
source.subscribe(new WindowExactBoundedSubscriber<>(
downstream,
timespan, unit, scheduler,
bufferSize, maxSize, restartTimerOnMaxSize));
return;
}
source.subscribe(new WindowSkipSubscriber<>(downstream,
timespan, timeskip, unit, scheduler.createWorker(), bufferSize));
}
abstract static class AbstractWindowSubscriber
extends AtomicInteger
implements FlowableSubscriber, Subscription {
private static final long serialVersionUID = 5724293814035355511L;
final Subscriber> downstream;
final SimplePlainQueue queue;
final long timespan;
final TimeUnit unit;
final int bufferSize;
final AtomicLong requested;
long emitted;
volatile boolean done;
Throwable error;
Subscription upstream;
final AtomicBoolean downstreamCancelled;
volatile boolean upstreamCancelled;
final AtomicInteger windowCount;
AbstractWindowSubscriber(Subscriber> downstream, long timespan, TimeUnit unit, int bufferSize) {
this.downstream = downstream;
this.queue = new MpscLinkedQueue<>();
this.timespan = timespan;
this.unit = unit;
this.bufferSize = bufferSize;
this.requested = new AtomicLong();
this.downstreamCancelled = new AtomicBoolean();
this.windowCount = new AtomicInteger(1);
}
@Override
public final void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
createFirstWindow();
}
}
abstract void createFirstWindow();
@Override
public final void onNext(T t) {
queue.offer(t);
drain();
}
@Override
public final void onError(Throwable t) {
error = t;
done = true;
drain();
}
@Override
public final void onComplete() {
done = true;
drain();
}
@Override
public final void request(long n) {
if (SubscriptionHelper.validate(n)) {
BackpressureHelper.add(requested, n);
}
}
@Override
public final void cancel() {
if (downstreamCancelled.compareAndSet(false, true)) {
windowDone();
}
}
final void windowDone() {
if (windowCount.decrementAndGet() == 0) {
cleanupResources();
upstream.cancel();
upstreamCancelled = true;
drain();
}
}
abstract void cleanupResources();
abstract void drain();
}
static final class WindowExactUnboundedSubscriber
extends AbstractWindowSubscriber
implements Runnable {
private static final long serialVersionUID = 1155822639622580836L;
final Scheduler scheduler;
UnicastProcessor window;
final SequentialDisposable timer;
static final Object NEXT_WINDOW = new Object();
final Runnable windowRunnable;
WindowExactUnboundedSubscriber(Subscriber> actual, long timespan, TimeUnit unit,
Scheduler scheduler, int bufferSize) {
super(actual, timespan, unit, bufferSize);
this.scheduler = scheduler;
this.timer = new SequentialDisposable();
this.windowRunnable = new WindowRunnable();
}
@Override
void createFirstWindow() {
if (!downstreamCancelled.get()) {
if (requested.get() != 0L) {
windowCount.getAndIncrement();
window = UnicastProcessor.create(bufferSize, windowRunnable);
emitted = 1;
FlowableWindowSubscribeIntercept intercept = new FlowableWindowSubscribeIntercept<>(window);
downstream.onNext(intercept);
timer.replace(scheduler.schedulePeriodicallyDirect(this, timespan, timespan, unit));
if (intercept.tryAbandon()) {
window.onComplete();
}
upstream.request(Long.MAX_VALUE);
} else {
upstream.cancel();
downstream.onError(missingBackpressureMessage(emitted));
cleanupResources();
upstreamCancelled = true;
}
}
}
@Override
public void run() {
queue.offer(NEXT_WINDOW);
drain();
}
@Override
void drain() {
if (getAndIncrement() != 0) {
return;
}
final SimplePlainQueue queue = this.queue;
final Subscriber> downstream = this.downstream;
UnicastProcessor window = this.window;
int missed = 1;
for (;;) {
if (upstreamCancelled) {
queue.clear();
window = null;
this.window = null;
} else {
boolean isDone = done;
Object o = queue.poll();
boolean isEmpty = o == null;
if (isDone && isEmpty) {
Throwable ex = error;
if (ex != null) {
if (window != null) {
window.onError(ex);
}
downstream.onError(ex);
} else {
if (window != null) {
window.onComplete();
}
downstream.onComplete();
}
cleanupResources();
upstreamCancelled = true;
continue;
}
else if (!isEmpty) {
if (o == NEXT_WINDOW) {
if (window != null) {
window.onComplete();
window = null;
this.window = null;
}
if (downstreamCancelled.get()) {
timer.dispose();
} else {
if (requested.get() == emitted) {
upstream.cancel();
cleanupResources();
upstreamCancelled = true;
downstream.onError(missingBackpressureMessage(emitted));
} else {
emitted++;
windowCount.getAndIncrement();
window = UnicastProcessor.create(bufferSize, windowRunnable);
this.window = window;
FlowableWindowSubscribeIntercept intercept = new FlowableWindowSubscribeIntercept<>(window);
downstream.onNext(intercept);
if (intercept.tryAbandon()) {
window.onComplete();
}
}
}
} else if (window != null) {
@SuppressWarnings("unchecked")
T item = (T)o;
window.onNext(item);
}
continue;
}
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
@Override
void cleanupResources() {
timer.dispose();
}
final class WindowRunnable implements Runnable {
@Override
public void run() {
windowDone();
}
}
}
static final class WindowExactBoundedSubscriber
extends AbstractWindowSubscriber
implements Runnable {
private static final long serialVersionUID = -6130475889925953722L;
final Scheduler scheduler;
final boolean restartTimerOnMaxSize;
final long maxSize;
final Scheduler.Worker worker;
long count;
UnicastProcessor window;
final SequentialDisposable timer;
WindowExactBoundedSubscriber(
Subscriber> actual,
long timespan, TimeUnit unit, Scheduler scheduler,
int bufferSize, long maxSize, boolean restartTimerOnMaxSize) {
super(actual, timespan, unit, bufferSize);
this.scheduler = scheduler;
this.maxSize = maxSize;
this.restartTimerOnMaxSize = restartTimerOnMaxSize;
if (restartTimerOnMaxSize) {
worker = scheduler.createWorker();
} else {
worker = null;
}
this.timer = new SequentialDisposable();
}
@Override
void createFirstWindow() {
if (!downstreamCancelled.get()) {
if (requested.get() != 0L) {
emitted = 1;
windowCount.getAndIncrement();
window = UnicastProcessor.create(bufferSize, this);
FlowableWindowSubscribeIntercept intercept = new FlowableWindowSubscribeIntercept<>(window);
downstream.onNext(intercept);
Runnable boundaryTask = new WindowBoundaryRunnable(this, 1L);
if (restartTimerOnMaxSize) {
timer.replace(worker.schedulePeriodically(boundaryTask, timespan, timespan, unit));
} else {
timer.replace(scheduler.schedulePeriodicallyDirect(boundaryTask, timespan, timespan, unit));
}
if (intercept.tryAbandon()) {
window.onComplete();
}
upstream.request(Long.MAX_VALUE);
} else {
upstream.cancel();
downstream.onError(missingBackpressureMessage(emitted));
cleanupResources();
upstreamCancelled = true;
}
}
}
@Override
public void run() {
windowDone();
}
@Override
void cleanupResources() {
timer.dispose();
Worker w = worker;
if (w != null) {
w.dispose();
}
}
void boundary(WindowBoundaryRunnable sender) {
queue.offer(sender);
drain();
}
@Override
void drain() {
if (getAndIncrement() != 0) {
return;
}
int missed = 1;
final SimplePlainQueue queue = this.queue;
final Subscriber> downstream = this.downstream;
UnicastProcessor window = this.window;
for (;;) {
if (upstreamCancelled) {
queue.clear();
window = null;
this.window = null;
} else {
boolean isDone = done;
Object o = queue.poll();
boolean isEmpty = o == null;
if (isDone && isEmpty) {
Throwable ex = error;
if (ex != null) {
if (window != null) {
window.onError(ex);
}
downstream.onError(ex);
} else {
if (window != null) {
window.onComplete();
}
downstream.onComplete();
}
cleanupResources();
upstreamCancelled = true;
continue;
} else if (!isEmpty) {
if (o instanceof WindowBoundaryRunnable) {
WindowBoundaryRunnable boundary = (WindowBoundaryRunnable) o;
if (boundary.index == emitted || !restartTimerOnMaxSize) {
this.count = 0;
window = createNewWindow(window);
}
} else if (window != null) {
@SuppressWarnings("unchecked")
T item = (T)o;
window.onNext(item);
long count = this.count + 1;
if (count == maxSize) {
this.count = 0;
window = createNewWindow(window);
} else {
this.count = count;
}
}
continue;
}
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
UnicastProcessor createNewWindow(UnicastProcessor window) {
if (window != null) {
window.onComplete();
window = null;
}
if (downstreamCancelled.get()) {
cleanupResources();
} else {
long emitted = this.emitted;
if (requested.get() == emitted) {
upstream.cancel();
cleanupResources();
upstreamCancelled = true;
downstream.onError(missingBackpressureMessage(emitted));
} else {
this.emitted = ++emitted;
windowCount.getAndIncrement();
window = UnicastProcessor.create(bufferSize, this);
this.window = window;
FlowableWindowSubscribeIntercept intercept = new FlowableWindowSubscribeIntercept<>(window);
downstream.onNext(intercept);
if (restartTimerOnMaxSize) {
timer.update(worker.schedulePeriodically(new WindowBoundaryRunnable(this, emitted), timespan, timespan, unit));
}
if (intercept.tryAbandon()) {
window.onComplete();
}
}
}
return window;
}
static final class WindowBoundaryRunnable implements Runnable {
final WindowExactBoundedSubscriber parent;
final long index;
WindowBoundaryRunnable(WindowExactBoundedSubscriber parent, long index) {
this.parent = parent;
this.index = index;
}
@Override
public void run() {
parent.boundary(this);
}
}
}
static final class WindowSkipSubscriber
extends AbstractWindowSubscriber
implements Runnable {
private static final long serialVersionUID = -7852870764194095894L;
final long timeskip;
final Scheduler.Worker worker;
final List> windows;
WindowSkipSubscriber(Subscriber> actual,
long timespan, long timeskip, TimeUnit unit,
Worker worker, int bufferSize) {
super(actual, timespan, unit, bufferSize);
this.timeskip = timeskip;
this.worker = worker;
this.windows = new LinkedList<>();
}
@Override
void createFirstWindow() {
if (!downstreamCancelled.get()) {
if (requested.get() != 0L) {
emitted = 1;
windowCount.getAndIncrement();
UnicastProcessor window = UnicastProcessor.create(bufferSize, this);
windows.add(window);
FlowableWindowSubscribeIntercept intercept = new FlowableWindowSubscribeIntercept<>(window);
downstream.onNext(intercept);
worker.schedule(new WindowBoundaryRunnable(this, false), timespan, unit);
worker.schedulePeriodically(new WindowBoundaryRunnable(this, true), timeskip, timeskip, unit);
if (intercept.tryAbandon()) {
window.onComplete();
windows.remove(window);
}
upstream.request(Long.MAX_VALUE);
} else {
upstream.cancel();
downstream.onError(missingBackpressureMessage(emitted));
cleanupResources();
upstreamCancelled = true;
}
}
}
@Override
void cleanupResources() {
worker.dispose();
}
@Override
void drain() {
if (getAndIncrement() != 0) {
return;
}
int missed = 1;
final SimplePlainQueue queue = this.queue;
final Subscriber> downstream = this.downstream;
final List> windows = this.windows;
for (;;) {
if (upstreamCancelled) {
queue.clear();
windows.clear();
} else {
boolean isDone = done;
Object o = queue.poll();
boolean isEmpty = o == null;
if (isDone && isEmpty) {
Throwable ex = error;
if (ex != null) {
for (UnicastProcessor window : windows) {
window.onError(ex);
}
downstream.onError(ex);
} else {
for (UnicastProcessor window : windows) {
window.onComplete();
}
downstream.onComplete();
}
cleanupResources();
upstreamCancelled = true;
continue;
} else if (!isEmpty) {
if (o == WINDOW_OPEN) {
if (!downstreamCancelled.get()) {
long emitted = this.emitted;
if (requested.get() != emitted) {
this.emitted = ++emitted;
windowCount.getAndIncrement();
UnicastProcessor window = UnicastProcessor.create(bufferSize, this);
windows.add(window);
FlowableWindowSubscribeIntercept intercept = new FlowableWindowSubscribeIntercept<>(window);
downstream.onNext(intercept);
worker.schedule(new WindowBoundaryRunnable(this, false), timespan, unit);
if (intercept.tryAbandon()) {
window.onComplete();
}
} else {
upstream.cancel();
Throwable ex = missingBackpressureMessage(emitted);
for (UnicastProcessor window : windows) {
window.onError(ex);
}
downstream.onError(ex);
cleanupResources();
upstreamCancelled = true;
continue;
}
}
} else if (o == WINDOW_CLOSE) {
if (!windows.isEmpty()) {
windows.remove(0).onComplete();
}
} else {
@SuppressWarnings("unchecked")
T item = (T)o;
for (UnicastProcessor window : windows) {
window.onNext(item);
}
}
continue;
}
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
@Override
public void run() {
windowDone();
}
void boundary(boolean isOpen) {
queue.offer(isOpen ? WINDOW_OPEN : WINDOW_CLOSE);
drain();
}
static final Object WINDOW_OPEN = new Object();
static final Object WINDOW_CLOSE = new Object();
static final class WindowBoundaryRunnable implements Runnable {
final WindowSkipSubscriber parent;
final boolean isOpen;
WindowBoundaryRunnable(WindowSkipSubscriber parent, boolean isOpen) {
this.parent = parent;
this.isOpen = isOpen;
}
@Override
public void run() {
parent.boundary(isOpen);
}
}
}
static MissingBackpressureException missingBackpressureMessage(long index) {
return new MissingBackpressureException("Unable to emit the next window (#" + index + ") due to lack of requests. Please make sure the downstream is ready to consume windows.");
}
}
