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Reactive Extensions for Java
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/**
 * Copyright 2016 Netflix, Inc.
 *
 * 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.internal.functions.ObjectHelper;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Function;
import io.reactivex.internal.disposables.*;
import io.reactivex.internal.observers.FullArbiterObserver;
import io.reactivex.observers.*;
import io.reactivex.plugins.RxJavaPlugins;

public final class ObservableTimeout extends AbstractObservableWithUpstream {
    final ObservableSource firstTimeoutIndicator;
    final Function> itemTimeoutIndicator;
    final ObservableSource other;

    public ObservableTimeout(
            ObservableSource source,
            ObservableSource firstTimeoutIndicator,
            Function> itemTimeoutIndicator,
                    ObservableSource other) {
        super(source);
        this.firstTimeoutIndicator = firstTimeoutIndicator;
        this.itemTimeoutIndicator = itemTimeoutIndicator;
        this.other = other;
    }

    @Override
    public void subscribeActual(Observer t) {
        if (other == null) {
            source.subscribe(new TimeoutObserver(
                    new SerializedObserver(t),
                    firstTimeoutIndicator, itemTimeoutIndicator));
        } else {
            source.subscribe(new TimeoutOtherObserver(
                    t, firstTimeoutIndicator, itemTimeoutIndicator, other));
        }
    }

    static final class TimeoutObserver
    extends AtomicReference
    implements Observer, Disposable, OnTimeout {

        private static final long serialVersionUID = 2672739326310051084L;
        final Observer actual;
        final ObservableSource firstTimeoutIndicator;
        final Function> itemTimeoutIndicator;

        Disposable s;

        volatile long index;

        TimeoutObserver(Observer actual,
                ObservableSource firstTimeoutIndicator,
                Function> itemTimeoutIndicator) {
            this.actual = actual;
            this.firstTimeoutIndicator = firstTimeoutIndicator;
            this.itemTimeoutIndicator = itemTimeoutIndicator;
        }

        @Override
        public void onSubscribe(Disposable s) {
            if (DisposableHelper.validate(this.s, s)) {
                this.s = s;

                Observer a = actual;

                ObservableSource p = firstTimeoutIndicator;

                if (p != null) {
                    TimeoutInnerObserver tis = new TimeoutInnerObserver(this, 0);

                    if (compareAndSet(null, tis)) {
                        a.onSubscribe(this);
                        p.subscribe(tis);
                    }
                } else {
                    a.onSubscribe(this);
                }
            }
        }

        @Override
        public void onNext(T t) {
            long idx = index + 1;
            index = idx;

            actual.onNext(t);

            Disposable d = get();
            if (d != null) {
                d.dispose();
            }

            ObservableSource p;

            try {
                p = ObjectHelper.requireNonNull(itemTimeoutIndicator.apply(t), "The ObservableSource returned is null");
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                dispose();
                actual.onError(e);
                return;
            }

            TimeoutInnerObserver tis = new TimeoutInnerObserver(this, idx);

            if (compareAndSet(d, tis)) {
                p.subscribe(tis);
            }
        }

        @Override
        public void onError(Throwable t) {
            DisposableHelper.dispose(this);
            actual.onError(t);
        }

        @Override
        public void onComplete() {
            DisposableHelper.dispose(this);
            actual.onComplete();
        }

        @Override
        public void dispose() {
            if (DisposableHelper.dispose(this)) {
                s.dispose();
            }
        }

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

        @Override
        public void timeout(long idx) {
            if (idx == index) {
                dispose();
                actual.onError(new TimeoutException());
            }
        }

        @Override
        public void innerError(Throwable e) {
            s.dispose();
            actual.onError(e);
        }
    }

    interface OnTimeout {
        void timeout(long index);

        void innerError(Throwable e);
    }

    static final class TimeoutInnerObserver extends DisposableObserver