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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.rxjava3.internal.operators.observable;
import java.util.Objects;
import java.util.concurrent.atomic.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.internal.util.*;
import io.reactivex.rxjava3.observers.SerializedObserver;
import io.reactivex.rxjava3.operators.QueueDisposable;
import io.reactivex.rxjava3.operators.SimpleQueue;
import io.reactivex.rxjava3.operators.SpscLinkedArrayQueue;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class ObservableConcatMapScheduler extends AbstractObservableWithUpstream {
final Function> mapper;
final int bufferSize;
final ErrorMode delayErrors;
final Scheduler scheduler;
public ObservableConcatMapScheduler(ObservableSource source, Function> mapper,
int bufferSize, ErrorMode delayErrors, Scheduler scheduler) {
super(source);
this.mapper = mapper;
this.delayErrors = delayErrors;
this.bufferSize = Math.max(8, bufferSize);
this.scheduler = scheduler;
}
@Override
public void subscribeActual(Observer observer) {
if (delayErrors == ErrorMode.IMMEDIATE) {
SerializedObserver serial = new SerializedObserver<>(observer);
source.subscribe(new ConcatMapObserver<>(serial, mapper, bufferSize, scheduler.createWorker()));
} else {
source.subscribe(new ConcatMapDelayErrorObserver<>(observer, mapper, bufferSize, delayErrors == ErrorMode.END, scheduler.createWorker()));
}
}
static final class ConcatMapObserver extends AtomicInteger implements Observer, Disposable, Runnable {
private static final long serialVersionUID = 8828587559905699186L;
final Observer downstream;
final Function> mapper;
final InnerObserver inner;
final int bufferSize;
final Scheduler.Worker worker;
SimpleQueue queue;
Disposable upstream;
volatile boolean active;
volatile boolean disposed;
volatile boolean done;
int fusionMode;
ConcatMapObserver(Observer actual,
Function> mapper, int bufferSize, Scheduler.Worker worker) {
this.downstream = actual;
this.mapper = mapper;
this.bufferSize = bufferSize;
this.inner = new InnerObserver<>(actual, this);
this.worker = worker;
}
@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();
worker.dispose();
if (getAndIncrement() == 0) {
queue.clear();
}
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
worker.schedule(this);
}
@Override
public void run() {
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);
worker.dispose();
return;
}
boolean empty = t == null;
if (d && empty) {
disposed = true;
downstream.onComplete();
worker.dispose();
return;
}
if (!empty) {
ObservableSource o;
try {
o = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
dispose();
queue.clear();
downstream.onError(ex);
worker.dispose();
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 ConcatMapObserver parent;
InnerObserver(Observer actual, ConcatMapObserver 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, Runnable {
private static final long serialVersionUID = -6951100001833242599L;
final Observer downstream;
final Function> mapper;
final int bufferSize;
final AtomicThrowable errors;
final DelayErrorInnerObserver observer;
final boolean tillTheEnd;
final Scheduler.Worker worker;
SimpleQueue queue;
Disposable upstream;
volatile boolean active;
volatile boolean done;
volatile boolean cancelled;
int sourceMode;
ConcatMapDelayErrorObserver(Observer actual,
Function> mapper, int bufferSize,
boolean tillTheEnd, Scheduler.Worker worker) {
this.downstream = actual;
this.mapper = mapper;
this.bufferSize = bufferSize;
this.tillTheEnd = tillTheEnd;
this.errors = new AtomicThrowable();
this.observer = new DelayErrorInnerObserver<>(actual, this);
this.worker = worker;
}
@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 (errors.tryAddThrowableOrReport(e)) {
done = true;
drain();
}
}
@Override
public void onComplete() {
done = true;
drain();
}
@Override
public boolean isDisposed() {
return cancelled;
}
@Override
public void dispose() {
cancelled = true;
upstream.dispose();
observer.dispose();
worker.dispose();
errors.tryTerminateAndReport();
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
worker.schedule(this);
}
@SuppressWarnings("unchecked")
@Override
public void run() {
Observer downstream = this.downstream;
SimpleQueue queue = this.queue;
AtomicThrowable errors = this.errors;
for (;;) {
if (!active) {
if (cancelled) {
queue.clear();
return;
}
if (!tillTheEnd) {
Throwable ex = errors.get();
if (ex != null) {
queue.clear();
cancelled = true;
errors.tryTerminateConsumer(downstream);
worker.dispose();
return;
}
}
boolean d = done;
T v;
try {
v = queue.poll();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
cancelled = true;
this.upstream.dispose();
errors.tryAddThrowableOrReport(ex);
errors.tryTerminateConsumer(downstream);
worker.dispose();
return;
}
boolean empty = v == null;
if (d && empty) {
cancelled = true;
errors.tryTerminateConsumer(downstream);
worker.dispose();
return;
}
if (!empty) {
ObservableSource o;
try {
o = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null ObservableSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
cancelled = true;
this.upstream.dispose();
queue.clear();
errors.tryAddThrowableOrReport(ex);
errors.tryTerminateConsumer(downstream);
worker.dispose();
return;
}
if (o instanceof Supplier) {
R w;
try {
w = ((Supplier)o).get();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
errors.tryAddThrowableOrReport(ex);
continue;
}
if (w != null && !cancelled) {
downstream.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.errors.tryAddThrowableOrReport(e)) {
if (!p.tillTheEnd) {
p.upstream.dispose();
}
p.active = false;
p.drain();
}
}
@Override
public void onComplete() {
ConcatMapDelayErrorObserver p = parent;
p.active = false;
p.drain();
}
void dispose() {
DisposableHelper.dispose(this);
}
}
}
}
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