/**
* 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.ObservableSource;
import io.reactivex.Observer;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.operators.observable.ObservableGroupJoin.*;
import io.reactivex.internal.queue.SpscLinkedArrayQueue;
import io.reactivex.internal.util.ExceptionHelper;
import io.reactivex.plugins.RxJavaPlugins;
public final class ObservableJoin<TLeft, TRight, TLeftEnd, TRightEnd, R> extends AbstractObservableWithUpstream<TLeft, R> {
final ObservableSource<? extends TRight> other;
final Function<? super TLeft, ? extends ObservableSource<TLeftEnd>> leftEnd;
final Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd;
final BiFunction<? super TLeft, ? super TRight, ? extends R> resultSelector;
public ObservableJoin(
ObservableSource<TLeft> source,
ObservableSource<? extends TRight> other,
Function<? super TLeft, ? extends ObservableSource<TLeftEnd>> leftEnd,
Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd,
BiFunction<? super TLeft, ? super TRight, ? extends R> resultSelector) {
super(source);
this.other = other;
this.leftEnd = leftEnd;
this.rightEnd = rightEnd;
this.resultSelector = resultSelector;
}
@Override
protected void subscribeActual(Observer<? super R> s) {
JoinDisposable<TLeft, TRight, TLeftEnd, TRightEnd, R> parent =
new JoinDisposable<TLeft, TRight, TLeftEnd, TRightEnd, R>(
s, leftEnd, rightEnd, resultSelector);
s.onSubscribe(parent);
LeftRightObserver left = new LeftRightObserver(parent, true);
parent.disposables.add(left);
LeftRightObserver right = new LeftRightObserver(parent, false);
parent.disposables.add(right);
source.subscribe(left);
other.subscribe(right);
}
static final class JoinDisposable<TLeft, TRight, TLeftEnd, TRightEnd, R>
extends AtomicInteger implements Disposable, JoinSupport {
private static final long serialVersionUID = -6071216598687999801L;
final Observer<? super R> actual;
final SpscLinkedArrayQueue<Object> queue;
final CompositeDisposable disposables;
final Map<Integer, TLeft> lefts;
final Map<Integer, TRight> rights;
final AtomicReference<Throwable> error;
final Function<? super TLeft, ? extends ObservableSource<TLeftEnd>> leftEnd;
final Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd;
final BiFunction<? super TLeft, ? super TRight, ? extends R> resultSelector;
final AtomicInteger active;
int leftIndex;
int rightIndex;
volatile boolean cancelled;
static final Integer LEFT_VALUE = 1;
static final Integer RIGHT_VALUE = 2;
static final Integer LEFT_CLOSE = 3;
static final Integer RIGHT_CLOSE = 4;
JoinDisposable(Observer<? super R> actual,
Function<? super TLeft, ? extends ObservableSource<TLeftEnd>> leftEnd,
Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd,
BiFunction<? super TLeft, ? super TRight, ? extends R> resultSelector) {
this.actual = actual;
this.disposables = new CompositeDisposable();
this.queue = new SpscLinkedArrayQueue<Object>(bufferSize());
this.lefts = new LinkedHashMap<Integer, TLeft>();
this.rights = new LinkedHashMap<Integer, TRight>();
this.error = new AtomicReference<Throwable>();
this.leftEnd = leftEnd;
this.rightEnd = rightEnd;
this.resultSelector = resultSelector;
this.active = new AtomicInteger(2);
}
@Override
public void dispose() {
if (!cancelled) {
cancelled = true;
cancelAll();
if (getAndIncrement() == 0) {
queue.clear();
}
}
}
@Override
public boolean isDisposed() {
return cancelled;
}
void cancelAll() {
disposables.dispose();
}
void errorAll(Observer<?> a) {
Throwable ex = ExceptionHelper.terminate(error);
lefts.clear();
rights.clear();
a.onError(ex);
}
void fail(Throwable exc, Observer<?> a, SpscLinkedArrayQueue<?> q) {
Exceptions.throwIfFatal(exc);
ExceptionHelper.addThrowable(error, exc);
q.clear();
cancelAll();
errorAll(a);
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
int missed = 1;
SpscLinkedArrayQueue<Object> q = queue;
Observer<? super R> a = actual;
for (;;) {
for (;;) {
if (cancelled) {
q.clear();
return;
}
Throwable ex = error.get();
if (ex != null) {
q.clear();
cancelAll();
errorAll(a);
return;
}
boolean d = active.get() == 0;
Integer mode = (Integer)q.poll();
boolean empty = mode == null;
if (d && empty) {
lefts.clear();
rights.clear();
disposables.dispose();
a.onComplete();
return;
}
if (empty) {
break;
}
Object val = q.poll();
if (mode == LEFT_VALUE) {
@SuppressWarnings("unchecked")
TLeft left = (TLeft)val;
int idx = leftIndex++;
lefts.put(idx, left);
ObservableSource<TLeftEnd> p;
try {
p = ObjectHelper.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null ObservableSource");
} catch (Throwable exc) {
fail(exc, a, q);
return;
}
LeftRightEndObserver end = new LeftRightEndObserver(this, true, idx);
disposables.add(end);
p.subscribe(end);
ex = error.get();
if (ex != null) {
q.clear();
cancelAll();
errorAll(a);
return;
}
for (TRight right : rights.values()) {
R w;
try {
w = ObjectHelper.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
} catch (Throwable exc) {
fail(exc, a, q);
return;
}
a.onNext(w);
}
}
else if (mode == RIGHT_VALUE) {
@SuppressWarnings("unchecked")
TRight right = (TRight)val;
int idx = rightIndex++;
rights.put(idx, right);
ObservableSource<TRightEnd> p;
try {
p = ObjectHelper.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null ObservableSource");
} catch (Throwable exc) {
fail(exc, a, q);
return;
}
LeftRightEndObserver end = new LeftRightEndObserver(this, false, idx);
disposables.add(end);
p.subscribe(end);
ex = error.get();
if (ex != null) {
q.clear();
cancelAll();
errorAll(a);
return;
}
for (TLeft left : lefts.values()) {
R w;
try {
w = ObjectHelper.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
} catch (Throwable exc) {
fail(exc, a, q);
return;
}
a.onNext(w);
}
}
else if (mode == LEFT_CLOSE) {
LeftRightEndObserver end = (LeftRightEndObserver)val;
lefts.remove(end.index);
disposables.remove(end);
} else {
LeftRightEndObserver end = (LeftRightEndObserver)val;
rights.remove(end.index);
disposables.remove(end);
}
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
@Override
public void innerError(Throwable ex) {
if (ExceptionHelper.addThrowable(error, ex)) {
active.decrementAndGet();
drain();
} else {
RxJavaPlugins.onError(ex);
}
}
@Override
public void innerComplete(LeftRightObserver sender) {
disposables.delete(sender);
active.decrementAndGet();
drain();
}
@Override
public void innerValue(boolean isLeft, Object o) {
synchronized (this) {
queue.offer(isLeft ? LEFT_VALUE : RIGHT_VALUE, o);
}
drain();
}
@Override
public void innerClose(boolean isLeft, LeftRightEndObserver index) {
synchronized (this) {
queue.offer(isLeft ? LEFT_CLOSE : RIGHT_CLOSE, index);
}
drain();
}
@Override
public void innerCloseError(Throwable ex) {
if (ExceptionHelper.addThrowable(error, ex)) {
drain();
} else {
RxJavaPlugins.onError(ex);
}
}
}
}