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/*
* 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.single;
import java.util.concurrent.atomic.AtomicInteger;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Action;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
/**
* Execute an action after an onSuccess, onError or a dispose event.
* History: 2.0.1 - experimental
* @param the value type
* @since 2.1
*/
public final class SingleDoFinally extends Single {
final SingleSource source;
final Action onFinally;
public SingleDoFinally(SingleSource source, Action onFinally) {
this.source = source;
this.onFinally = onFinally;
}
@Override
protected void subscribeActual(SingleObserver super T> observer) {
source.subscribe(new DoFinallyObserver<>(observer, onFinally));
}
static final class DoFinallyObserver extends AtomicInteger implements SingleObserver, Disposable {
private static final long serialVersionUID = 4109457741734051389L;
final SingleObserver super T> downstream;
final Action onFinally;
Disposable upstream;
DoFinallyObserver(SingleObserver super T> actual, Action onFinally) {
this.downstream = actual;
this.onFinally = onFinally;
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onSuccess(T t) {
downstream.onSuccess(t);
runFinally();
}
@Override
public void onError(Throwable t) {
downstream.onError(t);
runFinally();
}
@Override
public void dispose() {
upstream.dispose();
runFinally();
}
@Override
public boolean isDisposed() {
return upstream.isDisposed();
}
void runFinally() {
if (compareAndSet(0, 1)) {
try {
onFinally.run();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
RxJavaPlugins.onError(ex);
}
}
}
}
}