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rxjava2-extensions developed by David Karnok
There is a newer version: 0.20.10
/*
 * Copyright 2016-2017 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.rxjava2.parallel;

import org.reactivestreams.*;

import io.reactivex.exceptions.*;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.subscriptions.*;
import io.reactivex.plugins.RxJavaPlugins;

/**
 * Execute a Consumer in each 'rail' for the current element passing through.
 *
 * @param  the value type
 */
@SuppressWarnings("deprecation")
final class ParallelPeek extends ParallelFlowable {

    final ParallelFlowable source;

    final Consumer onNext;
    final Consumer onAfterNext;
    final Consumer onError;
    final Action onComplete;
    final Action onAfterTerminated;
    final Consumer onSubscribe;
    final LongConsumer onRequest;
    final Action onCancel;

    ParallelPeek(ParallelFlowable source,
            Consumer onNext,
            Consumer onAfterNext,
            Consumer onError,
            Action onComplete,
            Action onAfterTerminated,
            Consumer onSubscribe,
            LongConsumer onRequest,
            Action onCancel
    ) {
        this.source = source;

        this.onNext = ObjectHelper.requireNonNull(onNext, "onNext");
        this.onAfterNext = ObjectHelper.requireNonNull(onAfterNext, "onAfterNext");
        this.onError = ObjectHelper.requireNonNull(onError, "onError");
        this.onComplete = ObjectHelper.requireNonNull(onComplete, "onComplete");
        this.onAfterTerminated = ObjectHelper.requireNonNull(onAfterTerminated, "onAfterTerminated");
        this.onSubscribe = ObjectHelper.requireNonNull(onSubscribe, "onSubscribe");
        this.onRequest = ObjectHelper.requireNonNull(onRequest, "onRequest");
        this.onCancel = ObjectHelper.requireNonNull(onCancel, "onCancel");
    }

    @Override
    public void subscribe(Subscriber[] subscribers) {
        if (!validate(subscribers)) {
            return;
        }

        int n = subscribers.length;
        @SuppressWarnings("unchecked")
        Subscriber[] parents = new Subscriber[n];

        for (int i = 0; i < n; i++) {
            parents[i] = new ParallelPeekSubscriber(subscribers[i], this);
        }

        source.subscribe(parents);
    }

    @Override
    public int parallelism() {
        return source.parallelism();
    }

    static final class ParallelPeekSubscriber implements Subscriber, Subscription {

        final Subscriber actual;

        final ParallelPeek parent;

        Subscription s;

        boolean done;

        ParallelPeekSubscriber(Subscriber actual, ParallelPeek parent) {
            this.actual = actual;
            this.parent = parent;
        }

        @Override
        public void request(long n) {
            try {
                parent.onRequest.accept(n);
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                RxJavaPlugins.onError(ex);
            }
            s.request(n);
        }

        @Override
        public void cancel() {
            try {
                parent.onCancel.run();
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                RxJavaPlugins.onError(ex);
            }
            s.cancel();
        }

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

                try {
                    parent.onSubscribe.accept(s);
                } catch (Throwable ex) {
                    Exceptions.throwIfFatal(ex);
                    s.cancel();
                    actual.onSubscribe(EmptySubscription.INSTANCE);
                    onError(ex);
                    return;
                }

                actual.onSubscribe(this);
            }
        }

        @Override
        public void onNext(T t) {
            if (done) {
                return;
            }

            try {
                parent.onNext.accept(t);
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                onError(ex);
                return;
            }

            actual.onNext(t);

            try {
                parent.onAfterNext.accept(t);
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                onError(ex);
                return;
            }
        }

        @Override
        public void onError(Throwable t) {
            if (done) {
                RxJavaPlugins.onError(t);
                return;
            }
            done = true;

            try {
                parent.onError.accept(t);
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                t = new CompositeException(t, ex);
            }
            actual.onError(t);

            try {
                parent.onAfterTerminated.run();
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                RxJavaPlugins.onError(ex);
            }
        }

        @Override
        public void onComplete() {
            if (done) {
                return;
            }
            done = true;
            try {
                parent.onComplete.run();
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                actual.onError(ex);
                return;
            }
            actual.onComplete();

            try {
                parent.onAfterTerminated.run();
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                RxJavaPlugins.onError(ex);
            }
        }

    }
}