/**
* 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.Callable;
import java.util.concurrent.atomic.*;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.observers.QueueDrainObserver;
import io.reactivex.internal.queue.MpscLinkedQueue;
import io.reactivex.internal.util.NotificationLite;
import io.reactivex.observers.*;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.subjects.UnicastSubject;
public final class ObservableWindowBoundarySupplier<T, B> extends AbstractObservableWithUpstream<T, Observable<T>> {
final Callable<? extends ObservableSource<B>> other;
final int bufferSize;
public ObservableWindowBoundarySupplier(
ObservableSource<T> source,
Callable<? extends ObservableSource<B>> other, int bufferSize) {
super(source);
this.other = other;
this.bufferSize = bufferSize;
}
@Override
public void subscribeActual(Observer<? super Observable<T>> t) {
source.subscribe(new WindowBoundaryMainObserver<T, B>(new SerializedObserver<Observable<T>>(t), other, bufferSize));
}
static final class WindowBoundaryMainObserver<T, B>
extends QueueDrainObserver<T, Object, Observable<T>>
implements Disposable {
final Callable<? extends ObservableSource<B>> other;
final int bufferSize;
Disposable s;
final AtomicReference<Disposable> boundary = new AtomicReference<Disposable>();
UnicastSubject<T> window;
static final Object NEXT = new Object();
final AtomicLong windows = new AtomicLong();
WindowBoundaryMainObserver(Observer<? super Observable<T>> actual, Callable<? extends ObservableSource<B>> other,
int bufferSize) {
super(actual, new MpscLinkedQueue<Object>());
this.other = other;
this.bufferSize = bufferSize;
windows.lazySet(1);
}
@Override
public void onSubscribe(Disposable s) {
if (DisposableHelper.validate(this.s, s)) {
this.s = s;
Observer<? super Observable<T>> a = actual;
a.onSubscribe(this);
if (cancelled) {
return;
}
ObservableSource<B> p;
try {
p = ObjectHelper.requireNonNull(other.call(), "The first window ObservableSource supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
s.dispose();
a.onError(e);
return;
}
UnicastSubject<T> w = UnicastSubject.create(bufferSize);
window = w;
a.onNext(w);
WindowBoundaryInnerObserver<T, B> inner = new WindowBoundaryInnerObserver<T, B>(this);
if (boundary.compareAndSet(null, inner)) {
windows.getAndIncrement();
p.subscribe(inner);
}
}
}
@Override
public void onNext(T t) {
if (fastEnter()) {
UnicastSubject<T> w = window;
w.onNext(t);
if (leave(-1) == 0) {
return;
}
} else {
queue.offer(NotificationLite.next(t));
if (!enter()) {
return;
}
}
drainLoop();
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
error = t;
done = true;
if (enter()) {
drainLoop();
}
if (windows.decrementAndGet() == 0) {
DisposableHelper.dispose(boundary);
}
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
if (enter()) {
drainLoop();
}
if (windows.decrementAndGet() == 0) {
DisposableHelper.dispose(boundary);
}
actual.onComplete();
}
@Override
public void dispose() {
cancelled = true;
}
@Override
public boolean isDisposed() {
return cancelled;
}
void drainLoop() {
final MpscLinkedQueue<Object> q = (MpscLinkedQueue<Object>)queue;
final Observer<? super Observable<T>> a = actual;
int missed = 1;
UnicastSubject<T> w = window;
for (;;) {
for (;;) {
boolean d = done;
Object o = q.poll();
boolean empty = o == null;
if (d && empty) {
DisposableHelper.dispose(boundary);
Throwable e = error;
if (e != null) {
w.onError(e);
} else {
w.onComplete();
}
return;
}
if (empty) {
break;
}
if (o == NEXT) {
w.onComplete();
if (windows.decrementAndGet() == 0) {
DisposableHelper.dispose(boundary);
return;
}
if (cancelled) {
continue;
}
ObservableSource<B> p;
try {
p = ObjectHelper.requireNonNull(other.call(), "The ObservableSource supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
DisposableHelper.dispose(boundary);
a.onError(e);
return;
}
w = UnicastSubject.create(bufferSize);
windows.getAndIncrement();
window = w;
a.onNext(w);
WindowBoundaryInnerObserver<T, B> b = new WindowBoundaryInnerObserver<T, B>(this);
if (boundary.compareAndSet(boundary.get(), b)) {
p.subscribe(b);
}
continue;
}
w.onNext(NotificationLite.<T>getValue(o));
}
missed = leave(-missed);
if (missed == 0) {
return;
}
}
}
void next() {
queue.offer(NEXT);
if (enter()) {
drainLoop();
}
}
}
static final class WindowBoundaryInnerObserver<T, B> extends DisposableObserver<B> {
final WindowBoundaryMainObserver<T, B> parent;
boolean done;
WindowBoundaryInnerObserver(WindowBoundaryMainObserver<T, B> parent) {
this.parent = parent;
}
@Override
public void onNext(B t) {
if (done) {
return;
}
done = true;
dispose();
parent.next();
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
done = true;
parent.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
parent.onComplete();
// parent.next();
}
}
}