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/**
* 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.observable.internal.operators;
import java.util.concurrent.atomic.*;
import io.reactivex.common.*;
import io.reactivex.common.exceptions.Exceptions;
import io.reactivex.common.functions.Function;
import io.reactivex.common.internal.disposables.DisposableHelper;
import io.reactivex.common.internal.functions.ObjectHelper;
import io.reactivex.common.internal.utils.AtomicThrowable;
import io.reactivex.observable.*;
import io.reactivex.observable.internal.queues.SpscLinkedArrayQueue;
public final class ObservableSwitchMap extends AbstractObservableWithUpstream {
final Function> mapper;
final int bufferSize;
final boolean delayErrors;
public ObservableSwitchMap(ObservableSource source,
Function> mapper, int bufferSize,
boolean delayErrors) {
super(source);
this.mapper = mapper;
this.bufferSize = bufferSize;
this.delayErrors = delayErrors;
}
@Override
public void subscribeActual(Observer t) {
if (ObservableScalarXMap.tryScalarXMapSubscribe(source, t, mapper)) {
return;
}
source.subscribe(new SwitchMapObserver(t, mapper, bufferSize, delayErrors));
}
static final class SwitchMapObserver extends AtomicInteger implements Observer, Disposable {
private static final long serialVersionUID = -3491074160481096299L;
final Observer actual;
final Function> mapper;
final int bufferSize;
final boolean delayErrors;
final AtomicThrowable errors;
volatile boolean done;
volatile boolean cancelled;
Disposable s;
final AtomicReference> active = new AtomicReference>();
static final SwitchMapInnerObserver CANCELLED;
static {
CANCELLED = new SwitchMapInnerObserver(null, -1L, 1);
CANCELLED.cancel();
}
volatile long unique;
SwitchMapObserver(Observer actual,
Function> mapper, int bufferSize,
boolean delayErrors) {
this.actual = actual;
this.mapper = mapper;
this.bufferSize = bufferSize;
this.delayErrors = delayErrors;
this.errors = new AtomicThrowable();
}
@Override
public void onSubscribe(Disposable s) {
if (DisposableHelper.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
long c = unique + 1;
unique = c;
SwitchMapInnerObserver inner = active.get();
if (inner != null) {
inner.cancel();
}
ObservableSource p;
try {
p = ObjectHelper.requireNonNull(mapper.apply(t), "The ObservableSource returned is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
s.dispose();
onError(e);
return;
}
SwitchMapInnerObserver nextInner = new SwitchMapInnerObserver(this, c, bufferSize);
for (;;) {
inner = active.get();
if (inner == CANCELLED) {
break;
}
if (active.compareAndSet(inner, nextInner)) {
p.subscribe(nextInner);
break;
}
}
}
@Override
public void onError(Throwable t) {
if (done || !errors.addThrowable(t)) {
if (!delayErrors) {
disposeInner();
}
RxJavaCommonPlugins.onError(t);
return;
}
done = true;
drain();
}
@Override
public void onComplete() {
if (!done) {
done = true;
drain();
}
}
@Override
public void dispose() {
if (!cancelled) {
cancelled = true;
s.dispose();
disposeInner();
}
}
@Override
public boolean isDisposed() {
return cancelled;
}
@SuppressWarnings("unchecked")
void disposeInner() {
SwitchMapInnerObserver a = active.get();
if (a != CANCELLED) {
a = active.getAndSet((SwitchMapInnerObserver)CANCELLED);
if (a != CANCELLED && a != null) {
a.cancel();
}
}
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
final Observer a = actual;
int missing = 1;
for (;;) {
if (cancelled) {
return;
}
if (done) {
boolean empty = active.get() == null;
if (delayErrors) {
if (empty) {
Throwable ex = errors.get();
if (ex != null) {
a.onError(ex);
} else {
a.onComplete();
}
return;
}
} else {
Throwable ex = errors.get();
if (ex != null) {
a.onError(errors.terminate());
return;
}
if (empty) {
a.onComplete();
return;
}
}
}
SwitchMapInnerObserver inner = active.get();
if (inner != null) {
SpscLinkedArrayQueue q = inner.queue;
if (inner.done) {
boolean empty = q.isEmpty();
if (delayErrors) {
if (empty) {
active.compareAndSet(inner, null);
continue;
}
} else {
Throwable ex = errors.get();
if (ex != null) {
a.onError(errors.terminate());
return;
}
if (empty) {
active.compareAndSet(inner, null);
continue;
}
}
}
boolean retry = false;
for (;;) {
if (cancelled) {
return;
}
if (inner != active.get()) {
retry = true;
break;
}
if (!delayErrors) {
Throwable ex = errors.get();
if (ex != null) {
a.onError(errors.terminate());
return;
}
}
boolean d = inner.done;
R v = q.poll();
boolean empty = v == null;
if (d && empty) {
active.compareAndSet(inner, null);
retry = true;
break;
}
if (empty) {
break;
}
a.onNext(v);
}
if (retry) {
continue;
}
}
missing = addAndGet(-missing);
if (missing == 0) {
break;
}
}
}
void innerError(SwitchMapInnerObserver inner, Throwable ex) {
if (inner.index == unique && errors.addThrowable(ex)) {
if (!delayErrors) {
s.dispose();
}
inner.done = true;
drain();
} else {
RxJavaCommonPlugins.onError(ex);
}
}
}
static final class SwitchMapInnerObserver extends AtomicReference implements Observer {
private static final long serialVersionUID = 3837284832786408377L;
final SwitchMapObserver parent;
final long index;
final SpscLinkedArrayQueue queue;
volatile boolean done;
SwitchMapInnerObserver(SwitchMapObserver parent, long index, int bufferSize) {
this.parent = parent;
this.index = index;
this.queue = new SpscLinkedArrayQueue(bufferSize);
}
@Override
public void onSubscribe(Disposable s) {
DisposableHelper.setOnce(this, s);
}
@Override
public void onNext(R t) {
if (index == parent.unique) {
queue.offer(t);
parent.drain();
}
}
@Override
public void onError(Throwable t) {
parent.innerError(this, t);
}
@Override
public void onComplete() {
if (index == parent.unique) {
done = true;
parent.drain();
}
}
public void cancel() {
DisposableHelper.dispose(this);
}
}
}