io.reactivex.internal.operators.flowable.FlowableWindow Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava Show documentation
Show all versions of rxjava Show documentation
Reactive Extensions for Java
The newest version!
/**
* 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.ArrayDeque;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.internal.queue.SpscLinkedArrayQueue;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.internal.util.BackpressureHelper;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.processors.UnicastProcessor;
public final class FlowableWindow extends AbstractFlowableWithUpstream> {
final long size;
final long skip;
final int bufferSize;
public FlowableWindow(Flowable source, long size, long skip, int bufferSize) {
super(source);
this.size = size;
this.skip = skip;
this.bufferSize = bufferSize;
}
@Override
public void subscribeActual(Subscriber> s) {
if (skip == size) {
source.subscribe(new WindowExactSubscriber(s, size, bufferSize));
} else
if (skip > size) {
source.subscribe(new WindowSkipSubscriber(s, size, skip, bufferSize));
} else {
source.subscribe(new WindowOverlapSubscriber(s, size, skip, bufferSize));
}
}
static final class WindowExactSubscriber
extends AtomicInteger
implements FlowableSubscriber, Subscription, Runnable {
private static final long serialVersionUID = -2365647875069161133L;
final Subscriber> downstream;
final long size;
final AtomicBoolean once;
final int bufferSize;
long index;
Subscription upstream;
UnicastProcessor window;
WindowExactSubscriber(Subscriber> actual, long size, int bufferSize) {
super(1);
this.downstream = actual;
this.size = size;
this.once = new AtomicBoolean();
this.bufferSize = bufferSize;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
long i = index;
UnicastProcessor w = window;
if (i == 0) {
getAndIncrement();
w = UnicastProcessor.create(bufferSize, this);
window = w;
downstream.onNext(w);
}
i++;
w.onNext(t);
if (i == size) {
index = 0;
window = null;
w.onComplete();
} else {
index = i;
}
}
@Override
public void onError(Throwable t) {
Processor w = window;
if (w != null) {
window = null;
w.onError(t);
}
downstream.onError(t);
}
@Override
public void onComplete() {
Processor w = window;
if (w != null) {
window = null;
w.onComplete();
}
downstream.onComplete();
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
long u = BackpressureHelper.multiplyCap(size, n);
upstream.request(u);
}
}
@Override
public void cancel() {
if (once.compareAndSet(false, true)) {
run();
}
}
@Override
public void run() {
if (decrementAndGet() == 0) {
upstream.cancel();
}
}
}
static final class WindowSkipSubscriber
extends AtomicInteger
implements FlowableSubscriber, Subscription, Runnable {
private static final long serialVersionUID = -8792836352386833856L;
final Subscriber> downstream;
final long size;
final long skip;
final AtomicBoolean once;
final AtomicBoolean firstRequest;
final int bufferSize;
long index;
Subscription upstream;
UnicastProcessor window;
WindowSkipSubscriber(Subscriber> actual, long size, long skip, int bufferSize) {
super(1);
this.downstream = actual;
this.size = size;
this.skip = skip;
this.once = new AtomicBoolean();
this.firstRequest = new AtomicBoolean();
this.bufferSize = bufferSize;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
long i = index;
UnicastProcessor w = window;
if (i == 0) {
getAndIncrement();
w = UnicastProcessor.create(bufferSize, this);
window = w;
downstream.onNext(w);
}
i++;
if (w != null) {
w.onNext(t);
}
if (i == size) {
window = null;
w.onComplete();
}
if (i == skip) {
index = 0;
} else {
index = i;
}
}
@Override
public void onError(Throwable t) {
Processor w = window;
if (w != null) {
window = null;
w.onError(t);
}
downstream.onError(t);
}
@Override
public void onComplete() {
Processor w = window;
if (w != null) {
window = null;
w.onComplete();
}
downstream.onComplete();
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
if (!firstRequest.get() && firstRequest.compareAndSet(false, true)) {
long u = BackpressureHelper.multiplyCap(size, n);
long v = BackpressureHelper.multiplyCap(skip - size, n - 1);
long w = BackpressureHelper.addCap(u, v);
upstream.request(w);
} else {
long u = BackpressureHelper.multiplyCap(skip, n);
upstream.request(u);
}
}
}
@Override
public void cancel() {
if (once.compareAndSet(false, true)) {
run();
}
}
@Override
public void run() {
if (decrementAndGet() == 0) {
upstream.cancel();
}
}
}
static final class WindowOverlapSubscriber
extends AtomicInteger
implements FlowableSubscriber, Subscription, Runnable {
private static final long serialVersionUID = 2428527070996323976L;
final Subscriber> downstream;
final SpscLinkedArrayQueue> queue;
final long size;
final long skip;
final ArrayDeque> windows;
final AtomicBoolean once;
final AtomicBoolean firstRequest;
final AtomicLong requested;
final AtomicInteger wip;
final int bufferSize;
long index;
long produced;
Subscription upstream;
volatile boolean done;
Throwable error;
volatile boolean cancelled;
WindowOverlapSubscriber(Subscriber> actual, long size, long skip, int bufferSize) {
super(1);
this.downstream = actual;
this.size = size;
this.skip = skip;
this.queue = new SpscLinkedArrayQueue>(bufferSize);
this.windows = new ArrayDeque>();
this.once = new AtomicBoolean();
this.firstRequest = new AtomicBoolean();
this.requested = new AtomicLong();
this.wip = new AtomicInteger();
this.bufferSize = bufferSize;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (done) {
return;
}
long i = index;
if (i == 0) {
if (!cancelled) {
getAndIncrement();
UnicastProcessor w = UnicastProcessor.create(bufferSize, this);
windows.offer(w);
queue.offer(w);
drain();
}
}
i++;
for (Processor w : windows) {
w.onNext(t);
}
long p = produced + 1;
if (p == size) {
produced = p - skip;
Processor w = windows.poll();
if (w != null) {
w.onComplete();
}
} else {
produced = p;
}
if (i == skip) {
index = 0;
} else {
index = i;
}
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
for (Processor w : windows) {
w.onError(t);
}
windows.clear();
error = t;
done = true;
drain();
}
@Override
public void onComplete() {
if (done) {
return;
}
for (Processor w : windows) {
w.onComplete();
}
windows.clear();
done = true;
drain();
}
void drain() {
if (wip.getAndIncrement() != 0) {
return;
}
final Subscriber> a = downstream;
final SpscLinkedArrayQueue> q = queue;
int missed = 1;
for (;;) {
long r = requested.get();
long e = 0;
while (e != r) {
boolean d = done;
UnicastProcessor t = q.poll();
boolean empty = t == null;
if (checkTerminated(d, empty, a, q)) {
return;
}
if (empty) {
break;
}
a.onNext(t);
e++;
}
if (e == r) {
if (checkTerminated(done, q.isEmpty(), a, q)) {
return;
}
}
if (e != 0L && r != Long.MAX_VALUE) {
requested.addAndGet(-e);
}
missed = wip.addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
boolean checkTerminated(boolean d, boolean empty, Subscriber a, SpscLinkedArrayQueue q) {
if (cancelled) {
q.clear();
return true;
}
if (d) {
Throwable e = error;
if (e != null) {
q.clear();
a.onError(e);
return true;
} else
if (empty) {
a.onComplete();
return true;
}
}
return false;
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
BackpressureHelper.add(requested, n);
if (!firstRequest.get() && firstRequest.compareAndSet(false, true)) {
long u = BackpressureHelper.multiplyCap(skip, n - 1);
long v = BackpressureHelper.addCap(size, u);
upstream.request(v);
} else {
long u = BackpressureHelper.multiplyCap(skip, n);
upstream.request(u);
}
drain();
}
}
@Override
public void cancel() {
cancelled = true;
if (once.compareAndSet(false, true)) {
run();
}
}
@Override
public void run() {
if (decrementAndGet() == 0) {
upstream.cancel();
}
}
}
}