/**
* 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.*;
import java.util.concurrent.atomic.*;
import io.reactivex.Observable;
import io.reactivex.ObservableSource;
import io.reactivex.Observer;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Function;
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 ObservableWindowBoundarySelector<T, B, V> extends AbstractObservableWithUpstream<T, Observable<T>> {
final ObservableSource<B> open;
final Function<? super B, ? extends ObservableSource<V>> close;
final int bufferSize;
public ObservableWindowBoundarySelector(
ObservableSource<T> source,
ObservableSource<B> open, Function<? super B, ? extends ObservableSource<V>> close,
int bufferSize) {
super(source);
this.open = open;
this.close = close;
this.bufferSize = bufferSize;
}
@Override
public void subscribeActual(Observer<? super Observable<T>> t) {
source.subscribe(new WindowBoundaryMainObserver<T, B, V>(
new SerializedObserver<Observable<T>>(t),
open, close, bufferSize));
}
static final class WindowBoundaryMainObserver<T, B, V>
extends QueueDrainObserver<T, Object, Observable<T>>
implements Disposable {
final ObservableSource<B> open;
final Function<? super B, ? extends ObservableSource<V>> close;
final int bufferSize;
final CompositeDisposable resources;
Disposable s;
final AtomicReference<Disposable> boundary = new AtomicReference<Disposable>();
final List<UnicastSubject<T>> ws;
final AtomicLong windows = new AtomicLong();
WindowBoundaryMainObserver(Observer<? super Observable<T>> actual,
ObservableSource<B> open, Function<? super B, ? extends ObservableSource<V>> close, int bufferSize) {
super(actual, new MpscLinkedQueue<Object>());
this.open = open;
this.close = close;
this.bufferSize = bufferSize;
this.resources = new CompositeDisposable();
this.ws = new ArrayList<UnicastSubject<T>>();
windows.lazySet(1);
}
@Override
public void onSubscribe(Disposable s) {
if (DisposableHelper.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
if (cancelled) {
return;
}
OperatorWindowBoundaryOpenObserver<T, B> os = new OperatorWindowBoundaryOpenObserver<T, B>(this);
if (boundary.compareAndSet(null, os)) {
windows.getAndIncrement();
open.subscribe(os);
}
}
}
@Override
public void onNext(T t) {
if (fastEnter()) {
for (UnicastSubject<T> w : ws) {
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) {
resources.dispose();
}
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
if (enter()) {
drainLoop();
}
if (windows.decrementAndGet() == 0) {
resources.dispose();
}
actual.onComplete();
}
void error(Throwable t) {
s.dispose();
resources.dispose();
onError(t);
}
@Override
public void dispose() {
cancelled = true;
}
@Override
public boolean isDisposed() {
return cancelled;
}
void disposeBoundary() {
resources.dispose();
DisposableHelper.dispose(boundary);
}
void drainLoop() {
final MpscLinkedQueue<Object> q = (MpscLinkedQueue<Object>)queue;
final Observer<? super Observable<T>> a = actual;
final List<UnicastSubject<T>> ws = this.ws;
int missed = 1;
for (;;) {
for (;;) {
boolean d = done;
Object o = q.poll();
boolean empty = o == null;
if (d && empty) {
disposeBoundary();
Throwable e = error;
if (e != null) {
for (UnicastSubject<T> w : ws) {
w.onError(e);
}
} else {
for (UnicastSubject<T> w : ws) {
w.onComplete();
}
}
ws.clear();
return;
}
if (empty) {
break;
}
if (o instanceof WindowOperation) {
@SuppressWarnings("unchecked")
WindowOperation<T, B> wo = (WindowOperation<T, B>) o;
UnicastSubject<T> w = wo.w;
if (w != null) {
if (ws.remove(wo.w)) {
wo.w.onComplete();
if (windows.decrementAndGet() == 0) {
disposeBoundary();
return;
}
}
continue;
}
if (cancelled) {
continue;
}
w = UnicastSubject.create(bufferSize);
ws.add(w);
a.onNext(w);
ObservableSource<V> p;
try {
p = ObjectHelper.requireNonNull(close.apply(wo.open), "The ObservableSource supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
cancelled = true;
a.onError(e);
continue;
}
OperatorWindowBoundaryCloseObserver<T, V> cl = new OperatorWindowBoundaryCloseObserver<T, V>(this, w);
if (resources.add(cl)) {
windows.getAndIncrement();
p.subscribe(cl);
}
continue;
}
for (UnicastSubject<T> w : ws) {
w.onNext(NotificationLite.<T>getValue(o));
}
}
missed = leave(-missed);
if (missed == 0) {
break;
}
}
}
@Override
public void accept(Observer<? super Observable<T>> a, Object v) {
}
void open(B b) {
queue.offer(new WindowOperation<Object, B>(null, b));
if (enter()) {
drainLoop();
}
}
void close(OperatorWindowBoundaryCloseObserver<T, V> w) {
resources.delete(w);
queue.offer(new WindowOperation<T, Object>(w.w, null));
if (enter()) {
drainLoop();
}
}
}
static final class WindowOperation<T, B> {
final UnicastSubject<T> w;
final B open;
WindowOperation(UnicastSubject<T> w, B open) {
this.w = w;
this.open = open;
}
}
static final class OperatorWindowBoundaryOpenObserver<T, B> extends DisposableObserver<B> {
final WindowBoundaryMainObserver<T, B, ?> parent;
OperatorWindowBoundaryOpenObserver(WindowBoundaryMainObserver<T, B, ?> parent) {
this.parent = parent;
}
@Override
public void onNext(B t) {
parent.open(t);
}
@Override
public void onError(Throwable t) {
parent.error(t);
}
@Override
public void onComplete() {
parent.onComplete();
}
}
static final class OperatorWindowBoundaryCloseObserver<T, V> extends DisposableObserver<V> {
final WindowBoundaryMainObserver<T, ?, V> parent;
final UnicastSubject<T> w;
boolean done;
OperatorWindowBoundaryCloseObserver(WindowBoundaryMainObserver<T, ?, V> parent, UnicastSubject<T> w) {
this.parent = parent;
this.w = w;
}
@Override
public void onNext(V t) {
if (done) {
return;
}
done = true;
dispose();
parent.close(this);
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
done = true;
parent.error(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
parent.close(this);
}
}
}