io.reactivex.observable.internal.operators.ObservableRepeatUntil Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava3-observable Show documentation
rxjava3-observable developed by David Karnok
The newest version!
/**
 * 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.observable.internal.operators;

import java.util.concurrent.atomic.AtomicInteger;

import io.reactivex.common.Disposable;
import io.reactivex.common.exceptions.Exceptions;
import io.reactivex.common.functions.BooleanSupplier;
import io.reactivex.common.internal.disposables.SequentialDisposable;
import io.reactivex.observable.*;

public final class ObservableRepeatUntil extends AbstractObservableWithUpstream {
    final BooleanSupplier until;
    public ObservableRepeatUntil(Observable source, BooleanSupplier until) {
        super(source);
        this.until = until;
    }

    @Override
    public void subscribeActual(Observer s) {
        SequentialDisposable sd = new SequentialDisposable();
        s.onSubscribe(sd);

        RepeatUntilObserver rs = new RepeatUntilObserver(s, until, sd, source);
        rs.subscribeNext();
    }

    static final class RepeatUntilObserver extends AtomicInteger implements Observer {

        private static final long serialVersionUID = -7098360935104053232L;

        final Observer actual;
        final SequentialDisposable sd;
        final ObservableSource source;
        final BooleanSupplier stop;
        RepeatUntilObserver(Observer actual, BooleanSupplier until, SequentialDisposable sd, ObservableSource source) {
            this.actual = actual;
            this.sd = sd;
            this.source = source;
            this.stop = until;
        }

        @Override
        public void onSubscribe(Disposable s) {
            sd.replace(s);
        }

        @Override
        public void onNext(T t) {
            actual.onNext(t);
        }
        @Override
        public void onError(Throwable t) {
            actual.onError(t);
        }

        @Override
        public void onComplete() {
            boolean b;
            try {
                b = stop.getAsBoolean();
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                actual.onError(e);
                return;
            }
            if (b) {
                actual.onComplete();
            } else {
                subscribeNext();
            }
        }

        /**
         * Subscribes to the source again via trampolining.
         */
        void subscribeNext() {
            if (getAndIncrement() == 0) {
                int missed = 1;
                for (;;) {
                    source.subscribe(this);

                    missed = addAndGet(-missed);
                    if (missed == 0) {
                        break;
                    }
                }
            }
        }
    }
}