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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.concurrent.atomic.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Cancellable;
import io.reactivex.rxjava3.internal.disposables.*;
import io.reactivex.rxjava3.internal.util.*;
import io.reactivex.rxjava3.operators.SimpleQueue;
import io.reactivex.rxjava3.operators.SpscLinkedArrayQueue;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class ObservableCreate extends Observable {
final ObservableOnSubscribe source;
public ObservableCreate(ObservableOnSubscribe source) {
this.source = source;
}
@Override
protected void subscribeActual(Observer observer) {
CreateEmitter parent = new CreateEmitter<>(observer);
observer.onSubscribe(parent);
try {
source.subscribe(parent);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
parent.onError(ex);
}
}
static final class CreateEmitter
extends AtomicReference
implements ObservableEmitter, Disposable {
private static final long serialVersionUID = -3434801548987643227L;
final Observer observer;
CreateEmitter(Observer observer) {
this.observer = observer;
}
@Override
public void onNext(T t) {
if (t == null) {
onError(ExceptionHelper.createNullPointerException("onNext called with a null value."));
return;
}
if (!isDisposed()) {
observer.onNext(t);
}
}
@Override
public void onError(Throwable t) {
if (!tryOnError(t)) {
RxJavaPlugins.onError(t);
}
}
@Override
public boolean tryOnError(Throwable t) {
if (t == null) {
t = ExceptionHelper.createNullPointerException("onError called with a null Throwable.");
}
if (!isDisposed()) {
try {
observer.onError(t);
} finally {
dispose();
}
return true;
}
return false;
}
@Override
public void onComplete() {
if (!isDisposed()) {
try {
observer.onComplete();
} finally {
dispose();
}
}
}
@Override
public void setDisposable(Disposable d) {
DisposableHelper.set(this, d);
}
@Override
public void setCancellable(Cancellable c) {
setDisposable(new CancellableDisposable(c));
}
@Override
public ObservableEmitter serialize() {
return new SerializedEmitter<>(this);
}
@Override
public void dispose() {
DisposableHelper.dispose(this);
}
@Override
public boolean isDisposed() {
return DisposableHelper.isDisposed(get());
}
@Override
public String toString() {
return String.format("%s{%s}", getClass().getSimpleName(), super.toString());
}
}
/**
* Serializes calls to onNext, onError and onComplete.
*
* @param the value type
*/
static final class SerializedEmitter
extends AtomicInteger
implements ObservableEmitter {
private static final long serialVersionUID = 4883307006032401862L;
final ObservableEmitter emitter;
final AtomicThrowable errors;
final SpscLinkedArrayQueue queue;
volatile boolean done;
SerializedEmitter(ObservableEmitter emitter) {
this.emitter = emitter;
this.errors = new AtomicThrowable();
this.queue = new SpscLinkedArrayQueue<>(16);
}
@Override
public void onNext(T t) {
if (done || emitter.isDisposed()) {
return;
}
if (t == null) {
onError(ExceptionHelper.createNullPointerException("onNext called with a null value."));
return;
}
if (get() == 0 && compareAndSet(0, 1)) {
emitter.onNext(t);
if (decrementAndGet() == 0) {
return;
}
} else {
SimpleQueue q = queue;
synchronized (q) {
q.offer(t);
}
if (getAndIncrement() != 0) {
return;
}
}
drainLoop();
}
@Override
public void onError(Throwable t) {
if (!tryOnError(t)) {
RxJavaPlugins.onError(t);
}
}
@Override
public boolean tryOnError(Throwable t) {
if (done || emitter.isDisposed()) {
return false;
}
if (t == null) {
t = ExceptionHelper.createNullPointerException("onError called with a null Throwable.");
}
if (errors.tryAddThrowable(t)) {
done = true;
drain();
return true;
}
return false;
}
@Override
public void onComplete() {
if (done || emitter.isDisposed()) {
return;
}
done = true;
drain();
}
void drain() {
if (getAndIncrement() == 0) {
drainLoop();
}
}
void drainLoop() {
ObservableEmitter e = emitter;
SpscLinkedArrayQueue q = queue;
AtomicThrowable errors = this.errors;
int missed = 1;
for (;;) {
for (;;) {
if (e.isDisposed()) {
q.clear();
return;
}
if (errors.get() != null) {
q.clear();
errors.tryTerminateConsumer(e);
return;
}
boolean d = done;
T v = q.poll();
boolean empty = v == null;
if (d && empty) {
e.onComplete();
return;
}
if (empty) {
break;
}
e.onNext(v);
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
@Override
public void setDisposable(Disposable d) {
emitter.setDisposable(d);
}
@Override
public void setCancellable(Cancellable c) {
emitter.setCancellable(c);
}
@Override
public boolean isDisposed() {
return emitter.isDisposed();
}
@Override
public ObservableEmitter serialize() {
return this;
}
@Override
public String toString() {
return emitter.toString();
}
}
}
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