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RxJava 3.x extra sources, operators and components and ports of many 1.x companion libraries.

There is a newer version: 3.1.1

/*
 * Copyright 2016-2019 David Karnok
 *
 * 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 hu.akarnokd.rxjava3.processors;

import java.util.concurrent.atomic.AtomicBoolean;

import org.reactivestreams.*;

import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
import io.reactivex.rxjava3.processors.FlowableProcessor;

final class FlowableProcessorWrap extends FlowableProcessor {

    final Processor source;

    volatile boolean done;
    Throwable error;

    FlowableProcessorWrap(Processor source) {
        this.source = source;
    }

    @Override
    public void onSubscribe(Subscription s) {
        source.onSubscribe(s);
    }

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

    @Override
    public void onError(Throwable t) {
        error = t;
        done = true;
        source.onError(t);
    }

    @Override
    public void onComplete() {
        done = true;
        source.onComplete();
    }

    @Override
    public boolean hasSubscribers() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean hasThrowable() {
        return done && error != null;
    }

    @Override
    public boolean hasComplete() {
        return done && error == null;
    }

    @Override
    public Throwable getThrowable() {
        return done ? error : null;
    }

    @Override
    protected void subscribeActual(Subscriber s) {
        source.subscribe(new WrapSubscriber(s));
    }

    final class WrapSubscriber extends AtomicBoolean implements Subscriber, Subscription {

        private static final long serialVersionUID = -6891177704330298695L;

        final Subscriber downstream;

        Subscription upstream;

        WrapSubscriber(Subscriber downstream) {
            this.downstream = downstream;
        }

        @Override
        public void onSubscribe(Subscription s) {
            this.upstream = s;

            downstream.onSubscribe(this);
        }

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

        @Override
        public void onError(Throwable t) {
            upstream = SubscriptionHelper.CANCELLED;
            downstream.onError(t);
        }

        @Override
        public void onComplete() {
            upstream = SubscriptionHelper.CANCELLED;
            downstream.onComplete();
        }

        @Override
        public void request(long n) {
            upstream.request(n);
        }

        @Override
        public void cancel() {
            if (compareAndSet(false, true)) {
                upstream.cancel();
                upstream = SubscriptionHelper.CANCELLED;
            }
        }
    }
}