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Reactive Extensions for Java
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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.internal.operators.single;

import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Action;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.plugins.RxJavaPlugins;

public final class SingleDoOnDispose extends Single {
    final SingleSource source;

    final Action onDispose;

    public SingleDoOnDispose(SingleSource source, Action onDispose) {
        this.source = source;
        this.onDispose = onDispose;
    }

    @Override
    protected void subscribeActual(final SingleObserver observer) {

        source.subscribe(new DoOnDisposeObserver(observer, onDispose));
    }

    static final class DoOnDisposeObserver
    extends AtomicReference
    implements SingleObserver, Disposable {
        private static final long serialVersionUID = -8583764624474935784L;

        final SingleObserver downstream;

        Disposable upstream;

        DoOnDisposeObserver(SingleObserver actual, Action onDispose) {
            this.downstream = actual;
            this.lazySet(onDispose);
        }

        @Override
        public void dispose() {
            Action a = getAndSet(null);
            if (a != null) {
                try {
                    a.run();
                } catch (Throwable ex) {
                    Exceptions.throwIfFatal(ex);
                    RxJavaPlugins.onError(ex);
                }
                upstream.dispose();
            }
        }

        @Override
        public boolean isDisposed() {
            return upstream.isDisposed();
        }

        @Override
        public void onSubscribe(Disposable d) {
            if (DisposableHelper.validate(this.upstream, d)) {
                this.upstream = d;
                downstream.onSubscribe(this);
            }
        }

        @Override
        public void onSuccess(T value) {
            downstream.onSuccess(value);
        }

        @Override
        public void onError(Throwable e) {
            downstream.onError(e);
        }
    }

}