/**
* 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.atomic.*;
import io.reactivex.*;
import io.reactivex.disposables.
Disposable;
import io.reactivex.internal.disposables.
DisposableHelper;
import io.reactivex.observers.
SerializedObserver;
public final class
ObservableSampleWithObservable<T> extends
AbstractObservableWithUpstream<T, T> {
final
ObservableSource<?>
other;
final boolean
emitLast;
public
ObservableSampleWithObservable(
ObservableSource<T>
source,
ObservableSource<?>
other, boolean
emitLast) {
super(
source);
this.
other =
other;
this.
emitLast =
emitLast;
}
@
Override
public void
subscribeActual(
Observer<? super T>
t) {
SerializedObserver<T>
serial = new
SerializedObserver<T>(
t);
if (
emitLast) {
source.
subscribe(new
SampleMainEmitLast<T>(
serial,
other));
} else {
source.
subscribe(new
SampleMainNoLast<T>(
serial,
other));
}
}
abstract static class
SampleMainObserver<T> extends
AtomicReference<T>
implements
Observer<T>,
Disposable {
private static final long
serialVersionUID = -3517602651313910099L;
final
Observer<? super T>
downstream;
final
ObservableSource<?>
sampler;
final
AtomicReference<
Disposable>
other = new
AtomicReference<
Disposable>();
Disposable upstream;
SampleMainObserver(
Observer<? super T>
actual,
ObservableSource<?>
other) {
this.
downstream =
actual;
this.
sampler =
other;
}
@
Override
public void
onSubscribe(
Disposable d) {
if (
DisposableHelper.
validate(this.
upstream,
d)) {
this.
upstream =
d;
downstream.
onSubscribe(this);
if (
other.
get() == null) {
sampler.
subscribe(new
SamplerObserver<T>(this));
}
}
}
@
Override
public void
onNext(T
t) {
lazySet(
t);
}
@
Override
public void
onError(
Throwable t) {
DisposableHelper.
dispose(
other);
downstream.
onError(
t);
}
@
Override
public void
onComplete() {
DisposableHelper.
dispose(
other);
completeMain();
}
boolean
setOther(
Disposable o) {
return
DisposableHelper.
setOnce(
other,
o);
}
@
Override
public void
dispose() {
DisposableHelper.
dispose(
other);
upstream.
dispose();
}
@
Override
public boolean
isDisposed() {
return
other.
get() ==
DisposableHelper.
DISPOSED;
}
public void
error(
Throwable e) {
upstream.
dispose();
downstream.
onError(
e);
}
public void
complete() {
upstream.
dispose();
completeOther();
}
void
emit() {
T
value =
getAndSet(null);
if (
value != null) {
downstream.
onNext(
value);
}
}
abstract void
completeMain();
abstract void
completeOther();
abstract void
run();
}
static final class
SamplerObserver<T> implements
Observer<
Object> {
final
SampleMainObserver<T>
parent;
SamplerObserver(
SampleMainObserver<T>
parent) {
this.
parent =
parent;
}
@
Override
public void
onSubscribe(
Disposable d) {
parent.
setOther(
d);
}
@
Override
public void
onNext(
Object t) {
parent.
run();
}
@
Override
public void
onError(
Throwable t) {
parent.
error(
t);
}
@
Override
public void
onComplete() {
parent.
complete();
}
}
static final class
SampleMainNoLast<T> extends
SampleMainObserver<T> {
private static final long
serialVersionUID = -3029755663834015785L;
SampleMainNoLast(
Observer<? super T>
actual,
ObservableSource<?>
other) {
super(
actual,
other);
}
@
Override
void
completeMain() {
downstream.
onComplete();
}
@
Override
void
completeOther() {
downstream.
onComplete();
}
@
Override
void
run() {
emit();
}
}
static final class
SampleMainEmitLast<T> extends
SampleMainObserver<T> {
private static final long
serialVersionUID = -3029755663834015785L;
final
AtomicInteger wip;
volatile boolean
done;
SampleMainEmitLast(
Observer<? super T>
actual,
ObservableSource<?>
other) {
super(
actual,
other);
this.
wip = new
AtomicInteger();
}
@
Override
void
completeMain() {
done = true;
if (
wip.
getAndIncrement() == 0) {
emit();
downstream.
onComplete();
}
}
@
Override
void
completeOther() {
done = true;
if (
wip.
getAndIncrement() == 0) {
emit();
downstream.
onComplete();
}
}
@
Override
void
run() {
if (
wip.
getAndIncrement() == 0) {
do {
boolean
d =
done;
emit();
if (
d) {
downstream.
onComplete();
return;
}
} while (
wip.
decrementAndGet() != 0);
}
}
}
}