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Reactive Extensions for Java
There is a newer version: 3.1.9
/*
 * 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.observable;

import java.util.concurrent.atomic.AtomicInteger;

import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.*;
import io.reactivex.rxjava3.functions.BiPredicate;
import io.reactivex.rxjava3.internal.disposables.SequentialDisposable;

public final class ObservableRetryBiPredicate extends AbstractObservableWithUpstream {
    final BiPredicate predicate;
    public ObservableRetryBiPredicate(
            Observable source,
            BiPredicate predicate) {
        super(source);
        this.predicate = predicate;
    }

    @Override
    public void subscribeActual(Observer observer) {
        SequentialDisposable sa = new SequentialDisposable();
        observer.onSubscribe(sa);

        RetryBiObserver rs = new RetryBiObserver<>(observer, predicate, sa, source);
        rs.subscribeNext();
    }

    static final class RetryBiObserver extends AtomicInteger implements Observer {

        private static final long serialVersionUID = -7098360935104053232L;

        final Observer downstream;
        final SequentialDisposable upstream;
        final ObservableSource source;
        final BiPredicate predicate;
        int retries;
        RetryBiObserver(Observer actual,
                BiPredicate predicate, SequentialDisposable sa, ObservableSource source) {
            this.downstream = actual;
            this.upstream = sa;
            this.source = source;
            this.predicate = predicate;
        }

        @Override
        public void onSubscribe(Disposable d) {
            upstream.replace(d);
        }

        @Override
        public void onNext(T t) {
            downstream.onNext(t);
        }

        @Override
        public void onError(Throwable t) {
            boolean b;
            try {
                b = predicate.test(++retries, t);
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                downstream.onError(new CompositeException(t, e));
                return;
            }
            if (!b) {
                downstream.onError(t);
                return;
            }
            subscribeNext();
        }

        @Override
        public void onComplete() {
            downstream.onComplete();
        }

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

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