/**
* 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 io.reactivex.*;
import io.reactivex.annotations.
Nullable;
import io.reactivex.disposables.
Disposable;
import io.reactivex.exceptions.
Exceptions;
import io.reactivex.internal.disposables.
DisposableHelper;
import io.reactivex.internal.fuseable.*;
import io.reactivex.internal.observers.
BasicIntQueueDisposable;
import io.reactivex.internal.queue.
SpscLinkedArrayQueue;
import io.reactivex.internal.schedulers.
TrampolineScheduler;
import io.reactivex.plugins.
RxJavaPlugins;
public final class
ObservableObserveOn<T> extends
AbstractObservableWithUpstream<T, T> {
final
Scheduler scheduler;
final boolean
delayError;
final int
bufferSize;
public
ObservableObserveOn(
ObservableSource<T>
source,
Scheduler scheduler, boolean
delayError, int
bufferSize) {
super(
source);
this.
scheduler =
scheduler;
this.
delayError =
delayError;
this.
bufferSize =
bufferSize;
}
@
Override
protected void
subscribeActual(
Observer<? super T>
observer) {
if (
scheduler instanceof
TrampolineScheduler) {
source.
subscribe(
observer);
} else {
Scheduler.
Worker w =
scheduler.
createWorker();
source.
subscribe(new
ObserveOnObserver<T>(
observer,
w,
delayError,
bufferSize));
}
}
static final class
ObserveOnObserver<T> extends
BasicIntQueueDisposable<T>
implements
Observer<T>,
Runnable {
private static final long
serialVersionUID = 6576896619930983584L;
final
Observer<? super T>
downstream;
final
Scheduler.
Worker worker;
final boolean
delayError;
final int
bufferSize;
SimpleQueue<T>
queue;
Disposable upstream;
Throwable error;
volatile boolean
done;
volatile boolean
disposed;
int
sourceMode;
boolean
outputFused;
ObserveOnObserver(
Observer<? super T>
actual,
Scheduler.
Worker worker, boolean
delayError, int
bufferSize) {
this.
downstream =
actual;
this.
worker =
worker;
this.
delayError =
delayError;
this.
bufferSize =
bufferSize;
}
@
Override
public void
onSubscribe(
Disposable d) {
if (
DisposableHelper.
validate(this.
upstream,
d)) {
this.
upstream =
d;
if (
d instanceof
QueueDisposable) {
@
SuppressWarnings("unchecked")
QueueDisposable<T>
qd = (
QueueDisposable<T>)
d;
int
m =
qd.
requestFusion(
QueueDisposable.
ANY |
QueueDisposable.
BOUNDARY);
if (
m ==
QueueDisposable.
SYNC) {
sourceMode =
m;
queue =
qd;
done = true;
downstream.
onSubscribe(this);
schedule();
return;
}
if (
m ==
QueueDisposable.
ASYNC) {
sourceMode =
m;
queue =
qd;
downstream.
onSubscribe(this);
return;
}
}
queue = new
SpscLinkedArrayQueue<T>(
bufferSize);
downstream.
onSubscribe(this);
}
}
@
Override
public void
onNext(T
t) {
if (
done) {
return;
}
if (
sourceMode !=
QueueDisposable.
ASYNC) {
queue.
offer(
t);
}
schedule();
}
@
Override
public void
onError(
Throwable t) {
if (
done) {
RxJavaPlugins.
onError(
t);
return;
}
error =
t;
done = true;
schedule();
}
@
Override
public void
onComplete() {
if (
done) {
return;
}
done = true;
schedule();
}
@
Override
public void
dispose() {
if (!
disposed) {
disposed = true;
upstream.
dispose();
worker.
dispose();
if (
getAndIncrement() == 0) {
queue.
clear();
}
}
}
@
Override
public boolean
isDisposed() {
return
disposed;
}
void
schedule() {
if (
getAndIncrement() == 0) {
worker.
schedule(this);
}
}
void
drainNormal() {
int
missed = 1;
final
SimpleQueue<T>
q =
queue;
final
Observer<? super T>
a =
downstream;
for (;;) {
if (
checkTerminated(
done,
q.
isEmpty(),
a)) {
return;
}
for (;;) {
boolean
d =
done;
T
v;
try {
v =
q.
poll();
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
disposed = true;
upstream.
dispose();
q.
clear();
a.
onError(
ex);
worker.
dispose();
return;
}
boolean
empty =
v == null;
if (
checkTerminated(
d,
empty,
a)) {
return;
}
if (
empty) {
break;
}
a.
onNext(
v);
}
missed =
addAndGet(-
missed);
if (
missed == 0) {
break;
}
}
}
void
drainFused() {
int
missed = 1;
for (;;) {
if (
disposed) {
return;
}
boolean
d =
done;
Throwable ex =
error;
if (!
delayError &&
d &&
ex != null) {
disposed = true;
downstream.
onError(
error);
worker.
dispose();
return;
}
downstream.
onNext(null);
if (
d) {
disposed = true;
ex =
error;
if (
ex != null) {
downstream.
onError(
ex);
} else {
downstream.
onComplete();
}
worker.
dispose();
return;
}
missed =
addAndGet(-
missed);
if (
missed == 0) {
break;
}
}
}
@
Override
public void
run() {
if (
outputFused) {
drainFused();
} else {
drainNormal();
}
}
boolean
checkTerminated(boolean
d, boolean
empty,
Observer<? super T>
a) {
if (
disposed) {
queue.
clear();
return true;
}
if (
d) {
Throwable e =
error;
if (
delayError) {
if (
empty) {
disposed = true;
if (
e != null) {
a.
onError(
e);
} else {
a.
onComplete();
}
worker.
dispose();
return true;
}
} else {
if (
e != null) {
disposed = true;
queue.
clear();
a.
onError(
e);
worker.
dispose();
return true;
} else
if (
empty) {
disposed = true;
a.
onComplete();
worker.
dispose();
return true;
}
}
}
return false;
}
@
Override
public int
requestFusion(int
mode) {
if ((
mode &
ASYNC) != 0) {
outputFused = true;
return
ASYNC;
}
return
NONE;
}
@
Nullable
@
Override
public T
poll() throws
Exception {
return
queue.
poll();
}
@
Override
public void
clear() {
queue.
clear();
}
@
Override
public boolean
isEmpty() {
return
queue.
isEmpty();
}
}
}