/**
* 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.functions.
Action;
import io.reactivex.internal.disposables.
DisposableHelper;
import io.reactivex.internal.fuseable.*;
import io.reactivex.internal.observers.
BasicIntQueueDisposable;
import io.reactivex.plugins.
RxJavaPlugins;
/**
* Execute an action after an onError, onComplete or a dispose event.
* <p>History: 2.0.1 - experimental
* @param <T> the value type
* @since 2.1
*/
public final class
ObservableDoFinally<T> extends
AbstractObservableWithUpstream<T, T> {
final
Action onFinally;
public
ObservableDoFinally(
ObservableSource<T>
source,
Action onFinally) {
super(
source);
this.
onFinally =
onFinally;
}
@
Override
protected void
subscribeActual(
Observer<? super T>
observer) {
source.
subscribe(new
DoFinallyObserver<T>(
observer,
onFinally));
}
static final class
DoFinallyObserver<T> extends
BasicIntQueueDisposable<T> implements
Observer<T> {
private static final long
serialVersionUID = 4109457741734051389L;
final
Observer<? super T>
downstream;
final
Action onFinally;
Disposable upstream;
QueueDisposable<T>
qd;
boolean
syncFused;
DoFinallyObserver(
Observer<? super T>
actual,
Action onFinally) {
this.
downstream =
actual;
this.
onFinally =
onFinally;
}
@
SuppressWarnings("unchecked")
@
Override
public void
onSubscribe(
Disposable d) {
if (
DisposableHelper.
validate(this.
upstream,
d)) {
this.
upstream =
d;
if (
d instanceof
QueueDisposable) {
this.
qd = (
QueueDisposable<T>)
d;
}
downstream.
onSubscribe(this);
}
}
@
Override
public void
onNext(T
t) {
downstream.
onNext(
t);
}
@
Override
public void
onError(
Throwable t) {
downstream.
onError(
t);
runFinally();
}
@
Override
public void
onComplete() {
downstream.
onComplete();
runFinally();
}
@
Override
public void
dispose() {
upstream.
dispose();
runFinally();
}
@
Override
public boolean
isDisposed() {
return
upstream.
isDisposed();
}
@
Override
public int
requestFusion(int
mode) {
QueueDisposable<T>
qd = this.
qd;
if (
qd != null && (
mode &
BOUNDARY) == 0) {
int
m =
qd.
requestFusion(
mode);
if (
m !=
NONE) {
syncFused =
m ==
SYNC;
}
return
m;
}
return
NONE;
}
@
Override
public void
clear() {
qd.
clear();
}
@
Override
public boolean
isEmpty() {
return
qd.
isEmpty();
}
@
Nullable
@
Override
public T
poll() throws
Exception {
T
v =
qd.
poll();
if (
v == null &&
syncFused) {
runFinally();
}
return
v;
}
void
runFinally() {
if (
compareAndSet(0, 1)) {
try {
onFinally.
run();
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
RxJavaPlugins.
onError(
ex);
}
}
}
}
}