io.reactivex.internal.operators.observable.ObservableConcatMap 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
/**
* 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.functions.Function;
import io.reactivex.internal.disposables.*;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.fuseable.*;
import io.reactivex.internal.queue.SpscLinkedArrayQueue;
import io.reactivex.internal.util.*;
import io.reactivex.observers.SerializedObserver;
import io.reactivex.plugins.RxJavaPlugins;
public final class ObservableConcatMap extends AbstractObservableWithUpstream {
final Function> mapper;
final int bufferSize;
final ErrorMode delayErrors;
public ObservableConcatMap(ObservableSource source, Function> mapper,
int bufferSize, ErrorMode delayErrors) {
super(source);
this.mapper = mapper;
this.delayErrors = delayErrors;
this.bufferSize = Math.max(8, bufferSize);
}
@Override
public void subscribeActual(Observer observer) {
if (ObservableScalarXMap.tryScalarXMapSubscribe(source, observer, mapper)) {
return;
}
if (delayErrors == ErrorMode.IMMEDIATE) {
SerializedObserver serial = new SerializedObserver(observer);
source.subscribe(new SourceObserver(serial, mapper, bufferSize));
} else {
source.subscribe(new ConcatMapDelayErrorObserver(observer, mapper, bufferSize, delayErrors == ErrorMode.END));
}
}
static final class SourceObserver extends AtomicInteger implements Observer, Disposable {
private static final long serialVersionUID = 8828587559905699186L;
final Observer downstream;
final Function> mapper;
final InnerObserver inner;
final int bufferSize;
SimpleQueue queue;
Disposable upstream;
volatile boolean active;
volatile boolean disposed;
volatile boolean done;
int fusionMode;
SourceObserver(Observer actual,
Function> mapper, int bufferSize) {
this.downstream = actual;
this.mapper = mapper;
this.bufferSize = bufferSize;
this.inner = new InnerObserver(actual, this);
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
if (d instanceof QueueDisposable) {
@SuppressWarnings("unchecked")
QueueDisposable qd = (QueueDisposable) d;
int m = qd.requestFusion(QueueDisposable.ANY);
if (m == QueueDisposable.SYNC) {
fusionMode = m;
queue = qd;
done = true;
downstream.onSubscribe(this);
drain();
return;
}
if (m == QueueDisposable.ASYNC) {
fusionMode = m;
queue = qd;
downstream.onSubscribe(this);
return;
}
}
queue = new SpscLinkedArrayQueue(bufferSize);
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (done) {
return;
}
if (fusionMode == QueueDisposable.NONE) {
queue.offer(t);
}
drain();
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
done = true;
dispose();
downstream.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
drain();
}
void innerComplete() {
active = false;
drain();
}
@Override
public boolean isDisposed() {
return disposed;
}
@Override
public void dispose() {
disposed = true;
inner.dispose();
upstream.dispose();
if (getAndIncrement() == 0) {
queue.clear();
}
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
for (;;) {
if (disposed) {
queue.clear();
return;
}
if (!active) {
boolean d = done;
T t;
try {
t = queue.poll();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
dispose();
queue.clear();
downstream.onError(ex);
return;
}
boolean empty = t == null;
if (d && empty) {
disposed = true;
downstream.onComplete();
return;
}
if (!empty) {
ObservableSource o;
try {
o = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
dispose();
queue.clear();
downstream.onError(ex);
return;
}
active = true;
o.subscribe(inner);
}
}
if (decrementAndGet() == 0) {
break;
}
}
}
static final class InnerObserver extends AtomicReference implements Observer {
private static final long serialVersionUID = -7449079488798789337L;
final Observer downstream;
final SourceObserver parent;
InnerObserver(Observer actual, SourceObserver parent) {
this.downstream = actual;
this.parent = parent;
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.replace(this, d);
}
@Override
public void onNext(U t) {
downstream.onNext(t);
}
@Override
public void onError(Throwable t) {
parent.dispose();
downstream.onError(t);
}
@Override
public void onComplete() {
parent.innerComplete();
}
void dispose() {
DisposableHelper.dispose(this);
}
}
}
static final class ConcatMapDelayErrorObserver
extends AtomicInteger
implements Observer, Disposable {
private static final long serialVersionUID = -6951100001833242599L;
final Observer downstream;
final Function> mapper;
final int bufferSize;
final AtomicThrowable error;
final DelayErrorInnerObserver observer;
final boolean tillTheEnd;
SimpleQueue queue;
Disposable upstream;
volatile boolean active;
volatile boolean done;
volatile boolean cancelled;
int sourceMode;
ConcatMapDelayErrorObserver(Observer actual,
Function> mapper, int bufferSize,
boolean tillTheEnd) {
this.downstream = actual;
this.mapper = mapper;
this.bufferSize = bufferSize;
this.tillTheEnd = tillTheEnd;
this.error = new AtomicThrowable();
this.observer = new DelayErrorInnerObserver(actual, this);
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
if (d instanceof QueueDisposable) {
@SuppressWarnings("unchecked")
QueueDisposable qd = (QueueDisposable) d;
int m = qd.requestFusion(QueueDisposable.ANY);
if (m == QueueDisposable.SYNC) {
sourceMode = m;
queue = qd;
done = true;
downstream.onSubscribe(this);
drain();
return;
}
if (m == QueueDisposable.ASYNC) {
sourceMode = m;
queue = qd;
downstream.onSubscribe(this);
return;
}
}
queue = new SpscLinkedArrayQueue(bufferSize);
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T value) {
if (sourceMode == QueueDisposable.NONE) {
queue.offer(value);
}
drain();
}
@Override
public void onError(Throwable e) {
if (error.addThrowable(e)) {
done = true;
drain();
} else {
RxJavaPlugins.onError(e);
}
}
@Override
public void onComplete() {
done = true;
drain();
}
@Override
public boolean isDisposed() {
return cancelled;
}
@Override
public void dispose() {
cancelled = true;
upstream.dispose();
observer.dispose();
}
@SuppressWarnings("unchecked")
void drain() {
if (getAndIncrement() != 0) {
return;
}
Observer actual = this.downstream;
SimpleQueue queue = this.queue;
AtomicThrowable error = this.error;
for (;;) {
if (!active) {
if (cancelled) {
queue.clear();
return;
}
if (!tillTheEnd) {
Throwable ex = error.get();
if (ex != null) {
queue.clear();
cancelled = true;
actual.onError(error.terminate());
return;
}
}
boolean d = done;
T v;
try {
v = queue.poll();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
cancelled = true;
this.upstream.dispose();
error.addThrowable(ex);
actual.onError(error.terminate());
return;
}
boolean empty = v == null;
if (d && empty) {
cancelled = true;
Throwable ex = error.terminate();
if (ex != null) {
actual.onError(ex);
} else {
actual.onComplete();
}
return;
}
if (!empty) {
ObservableSource o;
try {
o = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null ObservableSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
cancelled = true;
this.upstream.dispose();
queue.clear();
error.addThrowable(ex);
actual.onError(error.terminate());
return;
}
if (o instanceof Callable) {
R w;
try {
w = ((Callable)o).call();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
error.addThrowable(ex);
continue;
}
if (w != null && !cancelled) {
actual.onNext(w);
}
continue;
} else {
active = true;
o.subscribe(observer);
}
}
}
if (decrementAndGet() == 0) {
break;
}
}
}
static final class DelayErrorInnerObserver extends AtomicReference implements Observer {
private static final long serialVersionUID = 2620149119579502636L;
final Observer downstream;
final ConcatMapDelayErrorObserver parent;
DelayErrorInnerObserver(Observer actual, ConcatMapDelayErrorObserver parent) {
this.downstream = actual;
this.parent = parent;
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.replace(this, d);
}
@Override
public void onNext(R value) {
downstream.onNext(value);
}
@Override
public void onError(Throwable e) {
ConcatMapDelayErrorObserver p = parent;
if (p.error.addThrowable(e)) {
if (!p.tillTheEnd) {
p.upstream.dispose();
}
p.active = false;
p.drain();
} else {
RxJavaPlugins.onError(e);
}
}
@Override
public void onComplete() {
ConcatMapDelayErrorObserver p = parent;
p.active = false;
p.drain();
}
void dispose() {
DisposableHelper.dispose(this);
}
}
}
}